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Stellenbosch University
1.
Coetzee, Marnette.
Feedforward activation in metabolic systems.
Degree: MSc, 2016, Stellenbosch University
URL: http://hdl.handle.net/10019.1/98700 
► rs201605
ENGLISH ABSTRACT : This thesis describes an analytical and quantitative analysis of the regulatory phenomenon of feedforward activation in metabolic pathways. The necessary background…
(more)
▼ rs201605
ENGLISH ABSTRACT : This thesis describes an analytical and quantitative analysis of the regulatory
phenomenon of feedforward activation in metabolic pathways. The necessary
background in kinetic modelling of metabolic pathways, enzyme kinetics
of allosteric enzymes, metabolic control analysis and supply-demand
analysis are provided. A few selected examples of feedforward activated
enzymes are discussed, focussing on their classification into the two major
mechanistic classes, namely K-enzymes, for which the allosteric activator acts
by increasing the affinity for the enzyme substrate (specific activation), and
V-enzymes, for which the allosteric activator acts by increasing the limiting
rate (Vf) of the enzyme (catalytic activation).
Feedforward activation is then studied by means of metabolic control
analysis and supply-demand analysis of a minimal system subject to feedforward
activation. An initial control analysis of the full system suggests
that saturation of the allosteric enzyme with its substrate would allow it to
control the flux through the demand pathway for the allosteric activator. The
enzyme kinetics of K-enzymes however show that under these conditions the
allosteric effect is abolished, and other conditions should be sought under
which the allosteric enzyme controls its demand flux. This was done using
supply-demand analysis, which showed that the allosteric enzyme would
have the necessary control of the activator demand flux if the nested supply
flux for its substrate was near equilibrium. V-enzymes do not exhibit this
problem, and the catalytic allosteric effect operates under conditions of substrate
saturation of the allosteric enzyme. A kinetic model of feedforwardregulated
system was constructed and used to provide data for a graphical analysis of the theoretical results.
The last part of the study is concerned with a particular allosteric enzyme,
lactate dehydrogenase (LDH) in glucose fermentation metabolism in
Lactococcus lactis, which is activated through feedforward action by fructose-
1,6-bisphosphate (FBP), with the interesting twist that it also has an absolute
requirement for FBP. An existing kinetic model of this metabolic pathway
contained a rate equation for LDH that only incorporated a non-cooperative
V-effect of FBP, but omitted other potentially important effects that have been
described in the literature, such as the competitive inhibition of FBP binding
by inorganic phosphate (Pi), cooperative binding of both FBP and Pi, and the
alteration of the KM-values of both the substrates pyruvate and NADH (Keffects).
A new rate equation for LDH that incorporated these effects was developed
and parameterised with data from the literature. The kinetic model
with the original and one with the new rate equation were compared in terms
of their steady-state behaviour as the external glucose concentration was increased
from 0 to 2mM. The only observable differences occurred at glucose
concentrations below 50mM and are probably of physiological…
Advisors/Committee Members: Hofmeyr, Jan-Hendrik Servaas, Rohwer, Johann Martin, Stellenbosch University. Faculty of Science. Department of Biochemistry.
Subjects/Keywords: Allosteric enzyme activation; Lactococcus lactis; Feedforward activation (FA); UCTD; Metabolism – Regulation – Models; Feedforward control systems
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APA (6th Edition):
Coetzee, M. (2016). Feedforward activation in metabolic systems. (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/98700
Chicago Manual of Style (16th Edition):
Coetzee, Marnette. “Feedforward activation in metabolic systems.” 2016. Masters Thesis, Stellenbosch University. Accessed March 04, 2021.
http://hdl.handle.net/10019.1/98700.
MLA Handbook (7th Edition):
Coetzee, Marnette. “Feedforward activation in metabolic systems.” 2016. Web. 04 Mar 2021.
Vancouver:
Coetzee M. Feedforward activation in metabolic systems. [Internet] [Masters thesis]. Stellenbosch University; 2016. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10019.1/98700.
Council of Science Editors:
Coetzee M. Feedforward activation in metabolic systems. [Masters Thesis]. Stellenbosch University; 2016. Available from: http://hdl.handle.net/10019.1/98700
RMIT University
2.
Batbayar, B.
Improving time efficiency of feedforward neural network learning.
Degree: 2008, RMIT University
URL: http://researchbank.rmit.edu.au/view/rmit:6613
► Feedforward neural networks have been widely studied and used in many applications in science and engineering. The training of this type of networks is mainly…
(more)
▼ Feedforward neural networks have been widely studied and used in many applications in science and engineering. The training of this type of networks is mainly undertaken using the well-known backpropagation based learning algorithms. One major problem with this type of algorithms is the slow training convergence speed, which hinders their applications. In order to improve the training convergence speed of this type of algorithms, many researchers have developed different improvements and enhancements. However, the slow convergence problem has not been fully addressed. This thesis makes several contributions by proposing new backpropagation learning algorithms based on the terminal attractor concept to improve the existing backpropagation learning algorithms such as the gradient descent and Levenberg-Marquardt algorithms. These new algorithms enable fast convergence both at a distance from and in a close range of the ideal weights. In particular, a new fast convergence mechanism is proposed which is based on the fast terminal attractor concept. Comprehensive simulation studies are undertaken to demonstrate the effectiveness of the proposed backpropagataion algorithms with terminal attractors. Finally, three practical application cases of time series forecasting, character recognition and image interpolation are chosen to show the practicality and usefulness of the proposed learning algorithms with comprehensive comparative studies with existing algorithms.
Subjects/Keywords: Fields of Research; Feedforward control systems; Neural networks (Computer science)
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APA (6th Edition):
Batbayar, B. (2008). Improving time efficiency of feedforward neural network learning. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:6613
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Batbayar, B. “Improving time efficiency of feedforward neural network learning.” 2008. Thesis, RMIT University. Accessed March 04, 2021.
http://researchbank.rmit.edu.au/view/rmit:6613.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Batbayar, B. “Improving time efficiency of feedforward neural network learning.” 2008. Web. 04 Mar 2021.
Vancouver:
Batbayar B. Improving time efficiency of feedforward neural network learning. [Internet] [Thesis]. RMIT University; 2008. [cited 2021 Mar 04].
Available from: http://researchbank.rmit.edu.au/view/rmit:6613.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Batbayar B. Improving time efficiency of feedforward neural network learning. [Thesis]. RMIT University; 2008. Available from: http://researchbank.rmit.edu.au/view/rmit:6613
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Colorado
3.
Butterworth, Jeffrey Austin.
Combined Feedback and Adaptive Feedforward Control for Tracking Applications in Atomic Force Microscopes.
Degree: PhD, Electrical, Computer & Energy Engineering, 2011, University of Colorado
URL: https://scholar.colorado.edu/ecen_gradetds/19
► An atomic force microscope (AFM) can provide images with resolution at the atomic scale. The quality and speed of AFM images depend upon the…
(more)
▼ An atomic force microscope (AFM) can provide images with resolution at the atomic scale. The quality and speed of AFM images depend upon the overall dynamics of the AFM system. The behavior of AFMs varies considerably, and currently, the variability causes commercial AFMs to behave unreliably, which slows down and frustrates users. Since the time required to attain a quality AFM image is typically on the order of several minutes or more, substantial motivation exists to reduce the imaging time in AFMs. This thesis discusses combining feedback
control with
feedforward control for improved speed and performance in tracking applications for AFMs. In particular, two model-inverse-based
feedforward architectures are examined. Initial combined
feedforward/feedback experimental results show improvement over the feedback-only tracking results, but, being model-inverse-based, these controllers struggle in the presence of system model variation and/or uncertainty. As a result, tracking performance degrades as trajectories vary from the conditions with which the model was identified. To correct for this, a dual-adaptive
feedforward algorithm is introduced that adapts on parameters in two
feedforward filters. This partnership of adaptive
feedforward controllers improved experimental tracking results and robustness to model uncertainties resulting in repeatable high-performance and high-speed tracking throughout the range of the device.
Advisors/Committee Members: Lucy Y. Pao, Daniel Y. Abramovitch, Fred Hansen.
Subjects/Keywords: Adaptive; AFM; Control; Feedback; Feedforward; Tracking; Electrical and Computer Engineering
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APA (6th Edition):
Butterworth, J. A. (2011). Combined Feedback and Adaptive Feedforward Control for Tracking Applications in Atomic Force Microscopes. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/ecen_gradetds/19
Chicago Manual of Style (16th Edition):
Butterworth, Jeffrey Austin. “Combined Feedback and Adaptive Feedforward Control for Tracking Applications in Atomic Force Microscopes.” 2011. Doctoral Dissertation, University of Colorado. Accessed March 04, 2021.
https://scholar.colorado.edu/ecen_gradetds/19.
MLA Handbook (7th Edition):
Butterworth, Jeffrey Austin. “Combined Feedback and Adaptive Feedforward Control for Tracking Applications in Atomic Force Microscopes.” 2011. Web. 04 Mar 2021.
Vancouver:
Butterworth JA. Combined Feedback and Adaptive Feedforward Control for Tracking Applications in Atomic Force Microscopes. [Internet] [Doctoral dissertation]. University of Colorado; 2011. [cited 2021 Mar 04].
Available from: https://scholar.colorado.edu/ecen_gradetds/19.
Council of Science Editors:
Butterworth JA. Combined Feedback and Adaptive Feedforward Control for Tracking Applications in Atomic Force Microscopes. [Doctoral Dissertation]. University of Colorado; 2011. Available from: https://scholar.colorado.edu/ecen_gradetds/19
Cranfield University
4.
Baker, Mark.
Portfolio performance management in new product development : examining the influence of Feedforward anticipatory control on portfolio value and strategic alignment.
Degree: DBA, 2013, Cranfield University
URL: http://dspace.lib.cranfield.ac.uk/handle/1826/8072
► The organization I work in has 13 subsidiary businesses operating in the branded footwear and apparel industry. The industry currently faces significant macroeconomic and industry…
(more)
▼ The organization I work in has 13 subsidiary businesses operating in the branded footwear and apparel industry. The industry currently faces significant macroeconomic and industry challenges. One of our biggest challenges is how to avoid excessive and wasteful new product development whilst still building an attractive range of products for the customer. So the focus of my research is on the management control and governance of the New Product Development (NPD) process to solve a pressing business problem.
However, there is a gap in the literature. Many authors have claimed that our knowledge of the governance of NPD processes is incomplete and there is a dearth of actual studies in this area. My literature review looked at management control and in particular at the enduring problem of the need to generate control without stifling creativity. The literature led me to focus on the use of feedforward controls to influence NPD management teams to improve portfolio value and strategic alignment whilst simultaneously encouraging NPD experimentation. During this research I developed the concept of Feedforward Anticipatory Control (FAC), which encompasses the combination of feedforward control and double-loop learning. From this start my research question became “How does the use of FAC influence NPD management teams to improve portfolio value and strategic alignment?”
From theory and my initial case study research I developed, tested and refined a tool for ascertaining the level of FAC sophistication in use by NPD teams in their development process. The tool was then used in action research interventions to help the teams develop their sophistication in the use of FAC. The tool was found to be useable, useful and have value. The action research case studies were embedded in a case study protocol to ensure the rigour of my research. This involved developing a framework to investigate the consequences of my interventions, in terms of both hard performance metrics and softer team perceptions.
The contribution is in the use of management controls in NPD. The findings show that different levels of FAC sophistication can be applied in NPD and that the use of higher levels of FAC influences NPD teams to improve portfolio value and strategic alignment.
The contribution to practice is an intervention “toolkit” that can influence NPD teams to develop higher levels of FAC sophistication and generate improvements in NPD portfolio performance.
Subjects/Keywords: Feedforward control; new product development; portfolio management; performance management
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APA ·
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MLA ·
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CSE |
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Manager
APA (6th Edition):
Baker, M. (2013). Portfolio performance management in new product development : examining the influence of Feedforward anticipatory control on portfolio value and strategic alignment. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/8072
Chicago Manual of Style (16th Edition):
Baker, Mark. “Portfolio performance management in new product development : examining the influence of Feedforward anticipatory control on portfolio value and strategic alignment.” 2013. Doctoral Dissertation, Cranfield University. Accessed March 04, 2021.
http://dspace.lib.cranfield.ac.uk/handle/1826/8072.
MLA Handbook (7th Edition):
Baker, Mark. “Portfolio performance management in new product development : examining the influence of Feedforward anticipatory control on portfolio value and strategic alignment.” 2013. Web. 04 Mar 2021.
Vancouver:
Baker M. Portfolio performance management in new product development : examining the influence of Feedforward anticipatory control on portfolio value and strategic alignment. [Internet] [Doctoral dissertation]. Cranfield University; 2013. [cited 2021 Mar 04].
Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/8072.
Council of Science Editors:
Baker M. Portfolio performance management in new product development : examining the influence of Feedforward anticipatory control on portfolio value and strategic alignment. [Doctoral Dissertation]. Cranfield University; 2013. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/8072
Cranfield University
5.
Baker, Mark.
Portfolio performance management in new product development : examining the influence of Feedforward anticipatory control on portfolio value and strategic alignment.
Degree: Thesis (D.B.A.), 2013, Cranfield University
URL: http://dspace.lib.cranfield.ac.uk/handle/1826/8072
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.585438
► The organization I work in has 13 subsidiary businesses operating in the branded footwear and apparel industry. The industry currently faces significant macroeconomic and industry…
(more)
▼ The organization I work in has 13 subsidiary businesses operating in the branded footwear and apparel industry. The industry currently faces significant macroeconomic and industry challenges. One of our biggest challenges is how to avoid excessive and wasteful new product development whilst still building an attractive range of products for the customer. So the focus of my research is on the management control and governance of the New Product Development (NPD) process to solve a pressing business problem. However, there is a gap in the literature. Many authors have claimed that our knowledge of the governance of NPD processes is incomplete and there is a dearth of actual studies in this area. My literature review looked at management control and in particular at the enduring problem of the need to generate control without stifling creativity. The literature led me to focus on the use of feedforward controls to influence NPD management teams to improve portfolio value and strategic alignment whilst simultaneously encouraging NPD experimentation. During this research I developed the concept of Feedforward Anticipatory Control (FAC), which encompasses the combination of feedforward control and double-loop learning. From this start my research question became “How does the use of FAC influence NPD management teams to improve portfolio value and strategic alignment?” From theory and my initial case study research I developed, tested and refined a tool for ascertaining the level of FAC sophistication in use by NPD teams in their development process. The tool was then used in action research interventions to help the teams develop their sophistication in the use of FAC. The tool was found to be useable, useful and have value. The action research case studies were embedded in a case study protocol to ensure the rigour of my research. This involved developing a framework to investigate the consequences of my interventions, in terms of both hard performance metrics and softer team perceptions. The contribution is in the use of management controls in NPD. The findings show that different levels of FAC sophistication can be applied in NPD and that the use of higher levels of FAC influences NPD teams to improve portfolio value and strategic alignment. The contribution to practice is an intervention “toolkit” that can influence NPD teams to develop higher levels of FAC sophistication and generate improvements in NPD portfolio performance.
Subjects/Keywords: Feedforward control; new product development; portfolio management; performance management
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Baker, M. (2013). Portfolio performance management in new product development : examining the influence of Feedforward anticipatory control on portfolio value and strategic alignment. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/8072 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.585438
Chicago Manual of Style (16th Edition):
Baker, Mark. “Portfolio performance management in new product development : examining the influence of Feedforward anticipatory control on portfolio value and strategic alignment.” 2013. Doctoral Dissertation, Cranfield University. Accessed March 04, 2021.
http://dspace.lib.cranfield.ac.uk/handle/1826/8072 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.585438.
MLA Handbook (7th Edition):
Baker, Mark. “Portfolio performance management in new product development : examining the influence of Feedforward anticipatory control on portfolio value and strategic alignment.” 2013. Web. 04 Mar 2021.
Vancouver:
Baker M. Portfolio performance management in new product development : examining the influence of Feedforward anticipatory control on portfolio value and strategic alignment. [Internet] [Doctoral dissertation]. Cranfield University; 2013. [cited 2021 Mar 04].
Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/8072 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.585438.
Council of Science Editors:
Baker M. Portfolio performance management in new product development : examining the influence of Feedforward anticipatory control on portfolio value and strategic alignment. [Doctoral Dissertation]. Cranfield University; 2013. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/8072 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.585438
Delft University of Technology
6.
Al, Mees (author).
Feedforward control for wave disturbance rejection on floating offshore wind turbines.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:8b4851ef-02f7-4c1e-a949-6c7d18371873
► Classical feedback control for floating offshore wind turbines has limited capabilities to reduce wave disturbances. Feedforward control uses disturbance measurement, to construct an additional control…
(more)
▼ Classical feedback control for floating offshore wind turbines has limited capabilities to reduce wave disturbances. Feedforward control uses disturbance measurement, to construct an additional control law such that the disturbance is attenuated. The main objective of this work is to prove the concept of wave-FF control to attenuate wave disturbances. High-fidelity simulations demonstrate that FF control, based on wave measurements, is able to reject wave disturbances on the rotor speed effectively.
Mechanical Engineering | Systems and Control
Advisors/Committee Members: van Wingerden, Jan-Willem (mentor), van der Hoek, Daan (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: feedforward control; wave disturbance rejection; floating offshore windturbine
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APA ·
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Manager
APA (6th Edition):
Al, M. (. (2020). Feedforward control for wave disturbance rejection on floating offshore wind turbines. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8b4851ef-02f7-4c1e-a949-6c7d18371873
Chicago Manual of Style (16th Edition):
Al, Mees (author). “Feedforward control for wave disturbance rejection on floating offshore wind turbines.” 2020. Masters Thesis, Delft University of Technology. Accessed March 04, 2021.
http://resolver.tudelft.nl/uuid:8b4851ef-02f7-4c1e-a949-6c7d18371873.
MLA Handbook (7th Edition):
Al, Mees (author). “Feedforward control for wave disturbance rejection on floating offshore wind turbines.” 2020. Web. 04 Mar 2021.
Vancouver:
Al M(. Feedforward control for wave disturbance rejection on floating offshore wind turbines. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Mar 04].
Available from: http://resolver.tudelft.nl/uuid:8b4851ef-02f7-4c1e-a949-6c7d18371873.
Council of Science Editors:
Al M(. Feedforward control for wave disturbance rejection on floating offshore wind turbines. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:8b4851ef-02f7-4c1e-a949-6c7d18371873
Delft University of Technology
7.
Willems, M.E. (author).
Analysis of Skill Development in Manual Ramp Tracking Tasks: Using a Feedforward Pilot Model.
Degree: 2012, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:3a061451-78d2-4a22-922f-0116ca6662ea
► A study is performed analyzing the behavioral adaptation of pilots in skill based ramp tracking tasks performed with pursuit display. From data analyses of previous…
(more)
▼ A study is performed analyzing the behavioral adaptation of pilots in skill based ramp tracking tasks performed with pursuit display. From data analyses of previous ramp tracking experiments an indication is found that pilots who repeatedly perform the same ramp tracking task show a high level of adaptation to characteristics of the control task in their behavior. From the theory of Successive Organization of Perception it is expected that this development progresses towards precognitive behavior. To get to a better understanding of the transition between pursuit behavior and precognitive behavior, a pursuit ramp tracking and disturbance rejection experiment is performed to further study this. For this four conditions with a different ramp steepness are used in blocks of ten runs, with eight similar ramps in each run. Two sessions are performed, one ordered session where the same condition is performed ten times consecutively and a random session, where conditions are presented in random order. After each block of ten ordered runs also a surprise run with a different condition is presented. The behavior is analyzed using performance metrics and by performing a time-domain parametric identification of a combined compensatory and feedforward pilot model. The behavior is analyzed in three ways: first by using the averaged data of the final five runs as steady-state behavior, then by using the data per run to investigate the development over the runs and finally the data per ramp is analyzed to investigate developments within a run. The surprise runs are analyzed over the entire run and per ramp. From performance and behavioral metrics no difference in ramp tracking behavior is shown when conditions are presented consecutively as opposed to randomly. From the model parameters though, it was found that the difference in behavior is predominantly visible in the feedforward pilot gain, and it is shown that the difference in behavior is mostly apparent in the first ramps of each tracking run. After the first two ramps, the pilots are found to already have adjusted their behavior towards their optimal control setting. From the surprise runs strong indications were found that pilots need more time to adjust after being conditioned in the previous ten runs to a different condition. This suggests that pilots use precognitive control strategies when they are more experienced in the task performed and think they know what to expect. Novel research should be performed to extend existing pilot models by modeling precognitive pilot behavior
Human Machine Interaction
Control and Simulation
Aerospace Engineering
Advisors/Committee Members: Mulder, M. (mentor), Pool, D.M. (mentor), Van Paassen, M.M. (mentor), Damveld, H.J. (mentor).
Subjects/Keywords: Control; Simulation; Human Machine Interaction; HMI; Modeling; Skill Development; feedforward; Skill
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APA ·
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Manager
APA (6th Edition):
Willems, M. E. (. (2012). Analysis of Skill Development in Manual Ramp Tracking Tasks: Using a Feedforward Pilot Model. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:3a061451-78d2-4a22-922f-0116ca6662ea
Chicago Manual of Style (16th Edition):
Willems, M E (author). “Analysis of Skill Development in Manual Ramp Tracking Tasks: Using a Feedforward Pilot Model.” 2012. Masters Thesis, Delft University of Technology. Accessed March 04, 2021.
http://resolver.tudelft.nl/uuid:3a061451-78d2-4a22-922f-0116ca6662ea.
MLA Handbook (7th Edition):
Willems, M E (author). “Analysis of Skill Development in Manual Ramp Tracking Tasks: Using a Feedforward Pilot Model.” 2012. Web. 04 Mar 2021.
Vancouver:
Willems ME(. Analysis of Skill Development in Manual Ramp Tracking Tasks: Using a Feedforward Pilot Model. [Internet] [Masters thesis]. Delft University of Technology; 2012. [cited 2021 Mar 04].
Available from: http://resolver.tudelft.nl/uuid:3a061451-78d2-4a22-922f-0116ca6662ea.
Council of Science Editors:
Willems ME(. Analysis of Skill Development in Manual Ramp Tracking Tasks: Using a Feedforward Pilot Model. [Masters Thesis]. Delft University of Technology; 2012. Available from: http://resolver.tudelft.nl/uuid:3a061451-78d2-4a22-922f-0116ca6662ea
Louisiana State University
8.
Zhang, Shuqi.
The effects of peripheral nerve impairments on postural control and mobility among people with peripheral neuropathy.
Degree: PhD, Kinesiology, 2014, Louisiana State University
URL: etd-06092014-153349
;
https://digitalcommons.lsu.edu/gradschool_dissertations/1425
► Approximately 20 million Americans are suffering Peripheral Neuropathy (PN). It is estimated that the prevalence of all-cause PN is about 2.4% in the entire adult…
(more)
▼ Approximately 20 million Americans are suffering Peripheral Neuropathy (PN). It is estimated that the prevalence of all-cause PN is about 2.4% in the entire adult population, whereas over 8-10% in the population segment over the age of 55 (Martyn & Hughes, 1997). Peripheral Neuropathy leads to a high risk of falling, resulting from the deficits of postural control caused by the impaired peripheral nerves, especially the degenerative somatosensory system. To date, there is no effective medical treatment for the disease but pain managements. The deficits of postural control decrease the life quality of this population. The degeneration of peripheral nerves reduces sensory inputs from the somatosensory system to central nervous system via spinal reflexive loop, which should provide valuable real-time information for balance correction. Therefore, it is necessary to investigate how PN affects the somatosensory system regarding postural control. Besides that, people with PN may develop a compensatory mechanism which could be reinforced by exercise training, ultimately to improve balance and mobility in their daily life. The neuroplasticity may occur within somatosensory system by relying on relative intact sensory resources. Hence, unveiling the compensatory mechanism in people with PN may help in understanding (a) essential sensations or function of peripheral nerves to postural control, (b) effective strategy of physical treatments for people with PN, and (c) task-dependent sensory information requirements. Therefore, this dissertation discussed the roles of foot sole sensation, ankle proprioception, and stretch reflex on balance as well as gait among people with PN. Furthermore, the discussion of the coupling between small and large afferent reflexive loops may spot the compensatory mechanism in people with PN.
Subjects/Keywords: Feedback and Feedforward Control; Hoffmann's Reflex; Postural Control; Functional Mobility; Peripheral Neuropathy
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Manager
APA (6th Edition):
Zhang, S. (2014). The effects of peripheral nerve impairments on postural control and mobility among people with peripheral neuropathy. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-06092014-153349 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1425
Chicago Manual of Style (16th Edition):
Zhang, Shuqi. “The effects of peripheral nerve impairments on postural control and mobility among people with peripheral neuropathy.” 2014. Doctoral Dissertation, Louisiana State University. Accessed March 04, 2021.
etd-06092014-153349 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1425.
MLA Handbook (7th Edition):
Zhang, Shuqi. “The effects of peripheral nerve impairments on postural control and mobility among people with peripheral neuropathy.” 2014. Web. 04 Mar 2021.
Vancouver:
Zhang S. The effects of peripheral nerve impairments on postural control and mobility among people with peripheral neuropathy. [Internet] [Doctoral dissertation]. Louisiana State University; 2014. [cited 2021 Mar 04].
Available from: etd-06092014-153349 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1425.
Council of Science Editors:
Zhang S. The effects of peripheral nerve impairments on postural control and mobility among people with peripheral neuropathy. [Doctoral Dissertation]. Louisiana State University; 2014. Available from: etd-06092014-153349 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1425
9.
Tammi, Kari.
Active Control of Radial Rotor Vibrations: Identification, Feedback, Feedforward, and Repetitive Control Methods.
Degree: 2007, VTT Technical Research Centre of Finland
URL: http://lib.tkk.fi/Diss/2007/isbn9789513870089/
► Active vibration control methods for rotors were studied in order to develop solutions to enhance machines' dynamic behaviour, durability, and operating range. The aim of…
(more)
▼ Active vibration control methods for rotors were studied in order to develop solutions to enhance machines' dynamic behaviour, durability, and operating range. The aim of the thesis was to develop identification and control methods for active vibration control of a rotor. The identification method developed in the thesis improved run-time rotor identification by compensating rotation-related disturbances before the actual identification procedure. The control system design comprised an inner feedback loop and an outer loop for compensation for harmonic excitations due to mass unbalance and other rotation-related excitations. The feedback loop was shown to be essential in terms of providing favourable conditions for the other compensation algorithm in the outer loop. For the outer loop, three algorithms were tested: two feedforward control methods and a repetitive control method. The algorithms were validated and compared using an experimental set-up. Concerning the feedforward methods, the Convergent Control algorithm was found to be a more effective and simpler algorithm for the purpose than the adaptive FIR filter with the LMS algorithm. The adaptive gradient-based repetitive control, developed in this thesis, was found to have a poorer performance than the feedforward control methods, but to provide benefits for applications where excitation frequencies are not as predictable as in the current application.
Aktiivisia roottorivärähtelyjen hallintamenetelmiä tutkittiin koneiden dynaamisen käyttäytymisen ja kestävyyden parantamiseksi sekä käyttöalueen laajentamiseksi. Väitöskirjan tavoite oli kehittää identifiointi- ja säätömenetelmiä roottorin aktiivisen värähtelynhallinnan tarkoituksiin. Kehitetty identifiointimenetelmä paransi roottorin käynninaikaista mallinnusta kompensoimalla pyörimisestä johtuvat häiriöt ennen varsinaista identifiointia. Kehitetty säätöjärjestelmä perustui sisempään takaisinkytkentäsilmukkaan ja ulompaan silmukkaan. Takaisinkytkentäsilmukalla osoitettiin olevan merkittävä rooli systeemin muokkaamisessa suotuisaksi ulomman silmukan säätöä silmällä pitäen. Ulommassa silmukassa testattiin kahta myötäkytkettyä säätömenetelmää ja yhtä oppivaa säätömenetelmää. Algoritmien toimivuutta vertailtiin koelaitteistolla. Myötäkytketyistä menetelmistä taajuustason algoritmi todettiin tehokkaammaksi ja yksinkertaisemmaksi kuin adaptiiviseen FIR-suotimeen perustuva LMS-algoritmi. Työssä kehitetty adaptiivinen oppiva algoritmi todettiin suorituskyvyltään huonommaksi kuin myötäkytketyt algoritmit. Toisaalta kyseisestä oppivasta algoritmista löydettiin etuja sovelluksiin, joissa herätetaajuudet eivät ole yhtä ennustettavia kuin tutkitussa tapauksessa.
VTT publications, ISSN 1455-0849; 634
Advisors/Committee Members: Helsinki University of Technology, Department of Automation and Systems Technology.
Subjects/Keywords: dynamic rotor systems; radial vibrations; rotors; control methods; active control; vibrations; identification; feedback control; feedforward control; repetitive control
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APA (6th Edition):
Tammi, K. (2007). Active Control of Radial Rotor Vibrations: Identification, Feedback, Feedforward, and Repetitive Control Methods. (Thesis). VTT Technical Research Centre of Finland. Retrieved from http://lib.tkk.fi/Diss/2007/isbn9789513870089/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tammi, Kari. “Active Control of Radial Rotor Vibrations: Identification, Feedback, Feedforward, and Repetitive Control Methods.” 2007. Thesis, VTT Technical Research Centre of Finland. Accessed March 04, 2021.
http://lib.tkk.fi/Diss/2007/isbn9789513870089/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tammi, Kari. “Active Control of Radial Rotor Vibrations: Identification, Feedback, Feedforward, and Repetitive Control Methods.” 2007. Web. 04 Mar 2021.
Vancouver:
Tammi K. Active Control of Radial Rotor Vibrations: Identification, Feedback, Feedforward, and Repetitive Control Methods. [Internet] [Thesis]. VTT Technical Research Centre of Finland; 2007. [cited 2021 Mar 04].
Available from: http://lib.tkk.fi/Diss/2007/isbn9789513870089/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tammi K. Active Control of Radial Rotor Vibrations: Identification, Feedback, Feedforward, and Repetitive Control Methods. [Thesis]. VTT Technical Research Centre of Finland; 2007. Available from: http://lib.tkk.fi/Diss/2007/isbn9789513870089/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Brno University of Technology
10.
Keprt, Jaroslav.
Bezsensorové polohové řízení solenoidu: Sensorless position control of solenoid valve.
Degree: 2019, Brno University of Technology
URL: http://hdl.handle.net/11012/43279
► This thesis deals with the determination of the position of the solenoid core in real time based on the measured current. The reference position of…
(more)
▼ This thesis deals with the determination of the position of the solenoid core in real time based on the measured current. The reference position of the current is used for feedback
control of the solenoid. For this issue, software tool Matlab/Simulink was used. For current and temperature measurements, PCB circuits were created. The whole project was carried out on the dSPACE platform.
Advisors/Committee Members: Houška, Pavel (advisor), Janák, Luděk (referee).
Subjects/Keywords: Solenoid; dSPACE; bezsenzorové polohové řízení solenoidu; lokalizace; feedback control; feedforward; PID; ControlDesk; Matlab/Simulink; Solenoid; dSPACE; sensorless position control of solenoid valve; feedback control; feedforward; PID; ControlDesk; Matlab/Simulink
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APA (6th Edition):
Keprt, J. (2019). Bezsensorové polohové řízení solenoidu: Sensorless position control of solenoid valve. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/43279
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Keprt, Jaroslav. “Bezsensorové polohové řízení solenoidu: Sensorless position control of solenoid valve.” 2019. Thesis, Brno University of Technology. Accessed March 04, 2021.
http://hdl.handle.net/11012/43279.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Keprt, Jaroslav. “Bezsensorové polohové řízení solenoidu: Sensorless position control of solenoid valve.” 2019. Web. 04 Mar 2021.
Vancouver:
Keprt J. Bezsensorové polohové řízení solenoidu: Sensorless position control of solenoid valve. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/11012/43279.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Keprt J. Bezsensorové polohové řízení solenoidu: Sensorless position control of solenoid valve. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/43279
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
11.
Wang, Na.
LIDAR-assisted feedforward and feedback control design for wind turbine tower load mitigation and power capture enhancement.
Degree: PhD, Electrical Engineering and Computer Science, 2013, Colorado School of Mines
URL: http://hdl.handle.net/11124/20
► In the wind industry, research needs exist in the areas of reduction of wind turbine structural loads and maximization of wind energy capture in order…
(more)
▼ In the wind industry, research needs exist in the areas of reduction of wind turbine structural loads and maximization of wind energy capture in order to reduce the cost of wind energy. For modern large scale variable-speed variable-pitch wind turbines, these goals can be achieved via the use of modern controllers. Current commercial wind turbine
control algorithms are typically feedback only and operate on a feedback signal such as the error in rotor speed or power out of the turbine. Recent advances in light detection and ranging (LIDAR) systems, which can provide realtime upcoming wind speed or direction measurements in front of the turbine using lasers, open a new area of research in
feedforward wind turbine
control.
Feedforward controllers that use preview wind measurements can compensate for the effect of wind disturbances on rotor speed and turbine structural components (blades, tower, shaft, etc.). Feedback controllers can be augmented with these
feedforward control strategies to improve turbine performance compared to feedback only controllers. In the dissertation, a number of combined
feedforward and feedback
control designs are proposed and developed for use with the Alstom ECO-100 3 MW turbine and the 600 kW controls advanced research turbine (CART3) at the National Renewable Energy Laboratory's (NREL) National Wind Technology Center (NWTC). Two research directions of wind turbine performance are pursued using LIDAR-enabled
feedforward and feedback
control designs: mitigating each turbine's fatigue loads and improving each turbine's energy production. For mitigating fatigue loads, an adaptive
feedforward controller based on a filtered-x recursive least squares (FX-RLS) algorithm has been designed to augment a predesigned collective pitch feedback controller for the CART3. Adaptive
control has the potential to overcome some of the drawbacks of linear time-invariant (LTI)
control, because the
control law in this case can be updated at every time step according to the wind input conditions. For the Alstom ECO-100, a collective pitch LQ-based preview
control scheme that augments the existing feedback controller has been designed with a Kalman filter in the
control loop as the observer. The LQ-based preview
control strategy is a scheme to synthesize closed-loop controllers including both a
feedforward term and a feedback term for LTI systems during tracking of previewed wind inputs by minimizing a defined output error. This design results in two feedback
control loops: one is the baseline pitch
control loop for speed regulation; the other is solved from the optimal preview
control strategy for tower fore-aft fatigue load mitigation. Regarding maximizing energy production, two advanced LIDAR-enabled torque controllers have been developed for the CART3: 1) disturbance tracking
control (DTC) augmented with LIDAR, where the wind speed estimator is replaced with the LIDAR measurement in the hopes of improving accuracy, but the feedback gain is kept at the same value as when the wind speed is estimated, and 2)…
Advisors/Committee Members: Johnson, Kathryn E. (advisor), Moore, Kevin L., 1960- (committee member), Steele, John P. H. (committee member), Vincent, Tyrone (committee member), Wright, Alan (committee member).
Subjects/Keywords: wind turbine; power capture enhancement; feedforward control; load mitigation; LIDAR; Wind turbines; Optical radar; Feedforward control systems; Feedback control systems; Wind power – Costs
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APA (6th Edition):
Wang, N. (2013). LIDAR-assisted feedforward and feedback control design for wind turbine tower load mitigation and power capture enhancement. (Doctoral Dissertation). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/20
Chicago Manual of Style (16th Edition):
Wang, Na. “LIDAR-assisted feedforward and feedback control design for wind turbine tower load mitigation and power capture enhancement.” 2013. Doctoral Dissertation, Colorado School of Mines. Accessed March 04, 2021.
http://hdl.handle.net/11124/20.
MLA Handbook (7th Edition):
Wang, Na. “LIDAR-assisted feedforward and feedback control design for wind turbine tower load mitigation and power capture enhancement.” 2013. Web. 04 Mar 2021.
Vancouver:
Wang N. LIDAR-assisted feedforward and feedback control design for wind turbine tower load mitigation and power capture enhancement. [Internet] [Doctoral dissertation]. Colorado School of Mines; 2013. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/11124/20.
Council of Science Editors:
Wang N. LIDAR-assisted feedforward and feedback control design for wind turbine tower load mitigation and power capture enhancement. [Doctoral Dissertation]. Colorado School of Mines; 2013. Available from: http://hdl.handle.net/11124/20
University of Washington
12.
Shi, Lihui.
Feedforward Control and Process Improvement for Some Time Series Disturbance Models.
Degree: PhD, 2013, University of Washington
URL: http://hdl.handle.net/1773/21918
► Process adjustment strategy is an important part of the process improvement methods, which is also called engineering process control (EPC), and it is often integrated…
(more)
▼ Process adjustment strategy is an important part of the process improvement methods, which is also called engineering process
control (EPC), and it is often integrated with statistical process
control (SPC) to improve the process
control performance. While feedback
control is used to compensate for the output deviation,
feedforward control is a proactive
control strategy based on a direct measurement of the disturbance, and it acts before the disturbance affects the system.
Feedforward control is usually combined with feedback
control for variation reduction. In this article, rationales for
feedforward control are explained, and a new philosophy on its application is given. The feasibility condition for
feedforward control application is illustrated from a new disturbance decomposition viewpoint, and the validity of some disturbance models which work well for
feedforward control is investigated. Some relevant issues on process monitoring, feedback
control and
feedforward control are discussed and addressed.
Advisors/Committee Members: Kapur, Kailash (advisor).
Subjects/Keywords: Engineering Process Control; Feedback Control; Feedforward Control; Statistical Process Control; Time Series Models; Engineering; Industrial engineering; Industrial engineering
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APA ·
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Export
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Manager
APA (6th Edition):
Shi, L. (2013). Feedforward Control and Process Improvement for Some Time Series Disturbance Models. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/21918
Chicago Manual of Style (16th Edition):
Shi, Lihui. “Feedforward Control and Process Improvement for Some Time Series Disturbance Models.” 2013. Doctoral Dissertation, University of Washington. Accessed March 04, 2021.
http://hdl.handle.net/1773/21918.
MLA Handbook (7th Edition):
Shi, Lihui. “Feedforward Control and Process Improvement for Some Time Series Disturbance Models.” 2013. Web. 04 Mar 2021.
Vancouver:
Shi L. Feedforward Control and Process Improvement for Some Time Series Disturbance Models. [Internet] [Doctoral dissertation]. University of Washington; 2013. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1773/21918.
Council of Science Editors:
Shi L. Feedforward Control and Process Improvement for Some Time Series Disturbance Models. [Doctoral Dissertation]. University of Washington; 2013. Available from: http://hdl.handle.net/1773/21918
13.
Achnib, Asma.
Développement de la commande CRONE avec effet anticipatif robuste : Development of the CRONE control with robust anticipative effect.
Degree: Docteur es, Automatique, Productique, Signal et Image, Ingénierie cognitique, 2019, Bordeaux; Université de Gabès (Tunisie)
URL: http://www.theses.fr/2019BORD0056
► Le travail présenté dans cette thèse s'inscrit dans le cadre de l'étude de l'efficacité de la commande CRONE avec effet anticipatif robuste dans les problèmes…
(more)
▼ Le travail présenté dans cette thèse s'inscrit dans le cadre de l'étude de l'efficacité de la commande CRONE avec effet anticipatif robuste dans les problèmes de poursuite et de régulation pour les systèmes monovariables et multivariables. L'objectif de l'anticipation est de concevoir des algorithmes de commande capables de minimiser un critère quadratique basé sur l'erreur entre la sortie du système et le signal de référence avec modération du niveau du signal de commande. La solution proposée repose sur l'association d'une commande robuste de type feedback à une commande anticipative de type feedforward. L'action feedforward utilise un filtre anticipatif synthétisé dans le domaine fréquentiel en utilisant des critères d'optimalité et de contraintes de type H₂ et H∞. La réduction du nombre de paramètres du filtre anticipatif en utilisant une période d'échantillonnage plus lente a été traitée. Des exemples académiques illustrent les développements théoriques. Une application pratique sur un système de régulation hydraulique a montré la pertinence de cette nouvelle approche.
The work presented in this thesis is part of the study of the effectiveness of CRONE control with anticipative effect in the problems of tracking and control for monovariable and multivariable systems. The anticipation objective is to design a control algorithm that minimizes a quadratic error between the reference and the output of the system and at the same time achieve a good level of the control signal. The proposed solution combines a robust feedback control with a feedforward control. The feedforward action uses optimality criteria and an anticipative filter which is designed in the frequency domain using a mix of H₂ et H∞ constraints. The reduction of the number of parameters of the anticipative filter by using a slower sampling period for the anticipative filter is treated. Academic examples highlight the theoretical developments. A practical application on a hydraulic control system has shown the efficiency of the developed approach.
Advisors/Committee Members: Lanusse, Patrick (thesis director), Aoun, Mohamed (thesis director).
Subjects/Keywords: Commande robuste; Filtre feedforward; Système à temps discret; Filtre anticipatif; H2; H∞; Robust control; Discrete-Time systems; Feedforward filter; Preview control; H2; H∞
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APA ·
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APA (6th Edition):
Achnib, A. (2019). Développement de la commande CRONE avec effet anticipatif robuste : Development of the CRONE control with robust anticipative effect. (Doctoral Dissertation). Bordeaux; Université de Gabès (Tunisie). Retrieved from http://www.theses.fr/2019BORD0056
Chicago Manual of Style (16th Edition):
Achnib, Asma. “Développement de la commande CRONE avec effet anticipatif robuste : Development of the CRONE control with robust anticipative effect.” 2019. Doctoral Dissertation, Bordeaux; Université de Gabès (Tunisie). Accessed March 04, 2021.
http://www.theses.fr/2019BORD0056.
MLA Handbook (7th Edition):
Achnib, Asma. “Développement de la commande CRONE avec effet anticipatif robuste : Development of the CRONE control with robust anticipative effect.” 2019. Web. 04 Mar 2021.
Vancouver:
Achnib A. Développement de la commande CRONE avec effet anticipatif robuste : Development of the CRONE control with robust anticipative effect. [Internet] [Doctoral dissertation]. Bordeaux; Université de Gabès (Tunisie); 2019. [cited 2021 Mar 04].
Available from: http://www.theses.fr/2019BORD0056.
Council of Science Editors:
Achnib A. Développement de la commande CRONE avec effet anticipatif robuste : Development of the CRONE control with robust anticipative effect. [Doctoral Dissertation]. Bordeaux; Université de Gabès (Tunisie); 2019. Available from: http://www.theses.fr/2019BORD0056
University of California – Berkeley
14.
Zhou, Shiying.
Adaptive Feedforward and Anti-windup Compensation for Amplitude and Rate Saturation with Application to Precision Control.
Degree: Mechanical Engineering, 2017, University of California – Berkeley
URL: http://www.escholarship.org/uc/item/7xr7761p
► Precision motion systems have stringent error tolerance and are subject to different sources of disturbances. These disturbances can be periodic or non-periodic, wide band or…
(more)
▼ Precision motion systems have stringent error tolerance and are subject to different sources of disturbances. These disturbances can be periodic or non-periodic, wide band or narrow band and concentrate at different frequency ranges. Moreover, actuators are subject to saturation problems, which can lead to degraded servo performance and even instability when the controllers are commanding over the physical limits of the actuators. In order to investigate the precision motion control strategies for disturbance rejection as well as saturation compensation, we study the vibration control and anti-windup compensation for the amplitude and rate saturations for the hard disk drive servo system, especially for the dual-stage system.The decoupled sensitivity design is presented to separate the dual-stage system into two single-input-single-output systems. Then the baseline controllers are designed using the Linear Quadratic Gaussian/ Loop Transfer Recovery to shape the overall sensitivity function. First, in order to reject periodic disturbances, two repetitive disturbance observers (RDOBs) are added. The additional RDOBs are proven to be add-on components to the overall sensitivity, thus extending repetitive narrow notches at the harmonic frequencies. As a result, the stability of the system is not influenced. And the two actuators are limited to operate at different frequencies for repetitive disturbance rejection.Second, the adaptive feed-forward control is designed to reject the low frequency wide-band vibrations. Two structures are proposed, in which pre-identification of either the plant model or the sensitivity model is performed. The infinite impulse response (IIR) filter is adapted, which is different from the conventional method using a finite impulse response filter. Besides, the error convergence is proven rigorously with assumptions. Therefore, the adaptive feed-forward control can approximate more complex unknown vibration transfer dynamics.Third, the saturation problem of the secondary actuator in the dual-stage hard disk drive system is discussed. To address this, the linear conditioning structure is exploited. The anti-windup controllers for the amplitude saturation are synthesized by formulating linear matrix inequality (LMI) optimizations. Robustness of the system is also analyzed. We combine the existing theorems and mathematical tools such as integral quadratic constraints, Schur complement, S-procedure, etc. and present procedural steps to formulate the LMI optimization problem for control synthesis. It is different from the method that utilizing the Lyapunov theory, thus does not involve the difficulty to come up with a feasible Lyapunov function.Finally, both amplitude and rate saturations are considered together. A generalized anti-windup controller is synthesized by formulating the saturation problem into a robust control problem. With additional loop transformation, the anti-windup controller is synthesized by µ-synthesis. This technique is less conservative and generalizable to systems with multiple…
Subjects/Keywords: Mechanical engineering; adaptive feedforward; anti-windup; Disturbance Observer; linear matrix inequality; robust control; Saturation
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APA ·
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Manager
APA (6th Edition):
Zhou, S. (2017). Adaptive Feedforward and Anti-windup Compensation for Amplitude and Rate Saturation with Application to Precision Control. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/7xr7761p
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhou, Shiying. “Adaptive Feedforward and Anti-windup Compensation for Amplitude and Rate Saturation with Application to Precision Control.” 2017. Thesis, University of California – Berkeley. Accessed March 04, 2021.
http://www.escholarship.org/uc/item/7xr7761p.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhou, Shiying. “Adaptive Feedforward and Anti-windup Compensation for Amplitude and Rate Saturation with Application to Precision Control.” 2017. Web. 04 Mar 2021.
Vancouver:
Zhou S. Adaptive Feedforward and Anti-windup Compensation for Amplitude and Rate Saturation with Application to Precision Control. [Internet] [Thesis]. University of California – Berkeley; 2017. [cited 2021 Mar 04].
Available from: http://www.escholarship.org/uc/item/7xr7761p.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhou S. Adaptive Feedforward and Anti-windup Compensation for Amplitude and Rate Saturation with Application to Precision Control. [Thesis]. University of California – Berkeley; 2017. Available from: http://www.escholarship.org/uc/item/7xr7761p
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Colorado
15.
Simley, Eric Jeffrey.
Wind Speed Preview Measurement and Estimation for Feedforward Control of Wind Turbines.
Degree: PhD, Electrical, Computer & Energy Engineering, 2015, University of Colorado
URL: https://scholar.colorado.edu/ecen_gradetds/111
► Wind turbines typically rely on feedback controllers to maximize power capture in below-rated conditions and regulate rotor speed during above-rated operation. However, measurements of…
(more)
▼ Wind turbines typically rely on feedback controllers to maximize power capture in below-rated conditions and regulate rotor speed during above-rated operation. However, measurements of the approaching wind provided by Light Detection and Ranging (lidar) can be used as part of a preview-based, or
feedforward,
control system in order to improve rotor speed regulation and reduce structural loads. But the effectiveness of preview-based
control depends on how accurately lidar can measure the wind that will interact with the turbine.
In this thesis, lidar measurement error is determined using a statistical frequency-domain wind field model including wind evolution, or the change in turbulent wind speeds between the time they are measured and when they reach the turbine. Parameters of the National Renewable Energy Laboratory (NREL) 5-MW reference turbine model are used to determine measurement error for a hub-mounted circularly-scanning lidar scenario, based on commercially-available technology, designed to estimate rotor effective uniform and shear wind speed components. By combining the wind field model, lidar model, and turbine parameters, the optimal lidar scan radius and preview distance that yield the minimum mean square measurement error, as well as the resulting minimum achievable error, are found for a variety of wind conditions. With optimized scan scenarios, it is found that relatively low measurement error can be achieved, but the attainable measurement error largely depends on the wind conditions. In addition, the impact of the induction zone, the region upstream of the turbine where the approaching wind speeds are reduced, as well as turbine yaw error on measurement quality is analyzed.
In order to minimize the mean square measurement error, an optimal measurement prefilter is employed, which depends on statistics of the correlation between the preview measurements and the wind that interacts with the turbine. However, because the wind speeds encountered by the turbine are unknown, a Kalman filter-based wind speed estimator is developed that relies on turbine sensor outputs. Using simulated lidar measurements in conjunction with wind speed estimator outputs based on aeroelastic simulations of the NREL 5-MW turbine model, it is shown how the optimal prefilter can adapt to varying degrees of measurement quality.
Advisors/Committee Members: Lucy Y. Pao, Patrick J. Moriarty, Alan D. Wright, Julie K. Lundquist, Jason R. Marden.
Subjects/Keywords: Feedforward Control; Lidar; Wind Energy; Wind Field Modeling; Wind Turbine Control; Controls and Control Theory; Power and Energy
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Manager
APA (6th Edition):
Simley, E. J. (2015). Wind Speed Preview Measurement and Estimation for Feedforward Control of Wind Turbines. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/ecen_gradetds/111
Chicago Manual of Style (16th Edition):
Simley, Eric Jeffrey. “Wind Speed Preview Measurement and Estimation for Feedforward Control of Wind Turbines.” 2015. Doctoral Dissertation, University of Colorado. Accessed March 04, 2021.
https://scholar.colorado.edu/ecen_gradetds/111.
MLA Handbook (7th Edition):
Simley, Eric Jeffrey. “Wind Speed Preview Measurement and Estimation for Feedforward Control of Wind Turbines.” 2015. Web. 04 Mar 2021.
Vancouver:
Simley EJ. Wind Speed Preview Measurement and Estimation for Feedforward Control of Wind Turbines. [Internet] [Doctoral dissertation]. University of Colorado; 2015. [cited 2021 Mar 04].
Available from: https://scholar.colorado.edu/ecen_gradetds/111.
Council of Science Editors:
Simley EJ. Wind Speed Preview Measurement and Estimation for Feedforward Control of Wind Turbines. [Doctoral Dissertation]. University of Colorado; 2015. Available from: https://scholar.colorado.edu/ecen_gradetds/111
University of Alberta
16.
Pacey, William C.
Control of a binary distillation column: an experimental
evaluation of feedforward and combined feedforward-feedback control
schemes.
Degree: MSin Chemical Engineering, Department of Chemical Engineering, 1973, University of Alberta
URL: https://era.library.ualberta.ca/files/8p58pg63w
Subjects/Keywords: Distillation – Automatic control.; Time delay systems.; Feedforward control systems.
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APA (6th Edition):
Pacey, W. C. (1973). Control of a binary distillation column: an experimental
evaluation of feedforward and combined feedforward-feedback control
schemes. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/8p58pg63w
Chicago Manual of Style (16th Edition):
Pacey, William C. “Control of a binary distillation column: an experimental
evaluation of feedforward and combined feedforward-feedback control
schemes.” 1973. Masters Thesis, University of Alberta. Accessed March 04, 2021.
https://era.library.ualberta.ca/files/8p58pg63w.
MLA Handbook (7th Edition):
Pacey, William C. “Control of a binary distillation column: an experimental
evaluation of feedforward and combined feedforward-feedback control
schemes.” 1973. Web. 04 Mar 2021.
Vancouver:
Pacey WC. Control of a binary distillation column: an experimental
evaluation of feedforward and combined feedforward-feedback control
schemes. [Internet] [Masters thesis]. University of Alberta; 1973. [cited 2021 Mar 04].
Available from: https://era.library.ualberta.ca/files/8p58pg63w.
Council of Science Editors:
Pacey WC. Control of a binary distillation column: an experimental
evaluation of feedforward and combined feedforward-feedback control
schemes. [Masters Thesis]. University of Alberta; 1973. Available from: https://era.library.ualberta.ca/files/8p58pg63w
University of Michigan
17.
Caverly, Ryan.
Optimal Output Modification and Robust Control Using Minimum Gain and the Large Gain Theorem.
Degree: PhD, Aerospace Engineering, 2018, University of Michigan
URL: http://hdl.handle.net/2027.42/143934
► When confronted with a control problem, the input-output properties of the system to be controlled play an important role in determining strategies that can or…
(more)
▼ When confronted with a
control problem, the input-output properties of the system to be controlled play an important role in determining strategies that can or should be applied, as well as the achievable closed-loop performance. Optimal output modification is a process in which the system output is modified in such a manner that the modified system has a desired input-output property and the modified output is as similar as possible to a specified desired output. The first part of this dissertation develops linear matrix inequality (LMI)-based optimal output modification techniques to render a linear time-invariant (LTI) system minimum phase using parallel
feedforward control or strictly positive real by linearly interpolating sensor measurements. H-ininifty-optimal parallel
feedforward controller synthesis methods that rely on the input-output system property of minimum gain are derived and tested on a numerical example. The H2- and H-infinity-optimal sensor interpolation techniques are implemented in numerical simulations of noncolocated elastic mechanical systems.
All mathematical models of physical systems are, to some degree, uncertain. Robust
control can provide a guarantee of closed-loop stability and/or performance of a system
subject to uncertainty, and is often performed using the well-known Small Gain Theorem. The second part of this dissertation introduces the lessor-known Large Gain Theorem and establishes its use for robust
control. A proof of the Large Gain Theorem for LTI systems using the familiar Nyquist stability criterion is derived, with the goal of drawing parallels to the Small Gain Theorem and increasing the understanding and appreciation of this theorem within the
control systems community. LMI-based robust controller synthesis methods using the Large Gain Theorem are presented and tested numerically on a robust
control benchmark problem with a comparison to H-infinity robust
control. The numerical results demonstrate the practicality of performing robust
control with the Large Gain Theorem, including its ability to guarantee an uncertain closed-loop system is minimum phase, which is a robust performance problem that previous robust
control techniques could not solve.
Advisors/Committee Members: Forbes, James Richard (committee member), Scruggs, Jeffrey T (committee member), Bernstein, Dennis S (committee member), Kolmanovsky, Ilya Vladimir (committee member).
Subjects/Keywords: robust control; optimal output modification; parallel feedforward control; Large Gain Theorem; nonminimum phase zeros; LMIs; Aerospace Engineering; Engineering
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APA (6th Edition):
Caverly, R. (2018). Optimal Output Modification and Robust Control Using Minimum Gain and the Large Gain Theorem. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/143934
Chicago Manual of Style (16th Edition):
Caverly, Ryan. “Optimal Output Modification and Robust Control Using Minimum Gain and the Large Gain Theorem.” 2018. Doctoral Dissertation, University of Michigan. Accessed March 04, 2021.
http://hdl.handle.net/2027.42/143934.
MLA Handbook (7th Edition):
Caverly, Ryan. “Optimal Output Modification and Robust Control Using Minimum Gain and the Large Gain Theorem.” 2018. Web. 04 Mar 2021.
Vancouver:
Caverly R. Optimal Output Modification and Robust Control Using Minimum Gain and the Large Gain Theorem. [Internet] [Doctoral dissertation]. University of Michigan; 2018. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/2027.42/143934.
Council of Science Editors:
Caverly R. Optimal Output Modification and Robust Control Using Minimum Gain and the Large Gain Theorem. [Doctoral Dissertation]. University of Michigan; 2018. Available from: http://hdl.handle.net/2027.42/143934
University of Colorado
18.
Dunne, Fiona.
Optimizing Blade Pitch Control of Wind Turbines with Preview Measurements of the Wind.
Degree: PhD, Electrical, Computer & Energy Engineering, 2016, University of Colorado
URL: https://scholar.colorado.edu/ecen_gradetds/125
► In above-rated wind speeds, the goal of a wind turbine blade pitch controller is to regulate rotor speed while minimizing structural loads and pitch…
(more)
▼ In above-rated wind speeds, the goal of a wind turbine blade pitch controller is to regulate rotor speed while minimizing structural loads and pitch actuation. This controller is typically feedback-only, relying on a generator speed measurement, and sometimes strain gauges and accelerometers. A preview measurement of the incoming wind speed (from a turbine-mounted lidar, for example) allows the addition of
feedforward control, which enables improved performance compared to feedback-only
control. The performance improvement depends both on the amount of preview time available in the wind speed measurement as well as the coherence (correlation as a function of frequency) between the wind measurement and the wind that is experienced by the turbine.
This thesis shows how to design an optimal collective-pitch controller that takes both preview time and measurement coherence into account. Simulation results show significantly reduced pitch actuation, improved generator speed regulation, and reduced structural loads compared to several different baseline cases. In addition, linear-model-based results show how the benefit of preview depends on the preview time and measurement coherence.
Effective lidar-based
control also requires knowledge of the expected arrival time of the measured wind. Arrival time is the time it takes for the wind to travel from the measurement focus location to the turbine rotor. Arrival time is often assumed to be equal to the distance traveled divided by the average wind speed. This thesis, using field test data, studies deviations from this assumption.
Control implementation across the full range of above-rated wind speeds can be achieved through gain scheduling. The effect of gain scheduling implementation on effective
feedforward and feedback gains is not straightforward. This thesis provides a detailed explanation of the effective gains resulting from two different gain-scheduling implementations. It includes an analysis of a simplified version of a nonlinear gain scheduling feedback loop as well as verification through simulation with a full nonlinear controller and turbine model.
Additional topics covered in this thesis include a model-inverse-based analysis of the conditions under which lidar is beneficial, a breakdown of the maximum useful amount of preview time by its different uses, and a comparison of two lidar-based individual pitch controllers.
Advisors/Committee Members: Lucy Y. Pao, Alan Wright, Eric Frew, Alan Wright, Behrouz Touri.
Subjects/Keywords: blade pitch control; feedforward; lidar; optimal control; wind preview; wind turbine; Electrical and Computer Engineering; Power and Energy
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Export
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APA (6th Edition):
Dunne, F. (2016). Optimizing Blade Pitch Control of Wind Turbines with Preview Measurements of the Wind. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/ecen_gradetds/125
Chicago Manual of Style (16th Edition):
Dunne, Fiona. “Optimizing Blade Pitch Control of Wind Turbines with Preview Measurements of the Wind.” 2016. Doctoral Dissertation, University of Colorado. Accessed March 04, 2021.
https://scholar.colorado.edu/ecen_gradetds/125.
MLA Handbook (7th Edition):
Dunne, Fiona. “Optimizing Blade Pitch Control of Wind Turbines with Preview Measurements of the Wind.” 2016. Web. 04 Mar 2021.
Vancouver:
Dunne F. Optimizing Blade Pitch Control of Wind Turbines with Preview Measurements of the Wind. [Internet] [Doctoral dissertation]. University of Colorado; 2016. [cited 2021 Mar 04].
Available from: https://scholar.colorado.edu/ecen_gradetds/125.
Council of Science Editors:
Dunne F. Optimizing Blade Pitch Control of Wind Turbines with Preview Measurements of the Wind. [Doctoral Dissertation]. University of Colorado; 2016. Available from: https://scholar.colorado.edu/ecen_gradetds/125
Iowa State University
19.
Mei, Yong.
Modeling and control to improve blood glucose concentration for people with diabetes.
Degree: 2017, Iowa State University
URL: https://lib.dr.iastate.edu/etd/16102
► Diabetes mellitus is a chronical condition that features either the lack of insulin or increased insulin resistance. It is a disorder in the human metabolic…
(more)
▼ Diabetes mellitus is a chronical condition that features either the lack of insulin or increased insulin resistance. It is a disorder in the human metabolic system. To combat insufficiency of insulin released by pancreas, a closed-loop control system, also known as artificial pancreas (AP) in this application, have been created to mimic the functionality of a human pancreas. An AP is used to regulate blood glucose concentration (BGC) by managing the release of insulin. Therefore, an algorithm, which can administer insulin to reduce the variation of BGC and minimize the occurrences of hyper-/ hypoglycemia episodes, is the key component of an AP. The objective of the dissertation is to develop an optimal algorithm to better control BGC for people with diabetes.
For people with Type 2 diabetes, prevention or treatment of diabetes mellitus can typically be done via a change of lifestyle and weight management. A virtual sensing system that does not require many manual inputs from patients can ease the burden for people with Type 2 diabetes. This dissertation covers the development of a monitoring system for Type 2 diabetes.
To achieve the goal of tighter control of BGC for people with Type 1 diabetes, dynamic modeling methodology for capturing the cause-and-effect relationship between manipulated variable (i.e. insulin) and controlled variable (i.e. BGC) has been developed. Theoretically, this dissertation has established that physiologically based nonlinear parameterized wiener models being superior to nonlinear autoregressive moving average with exogenous inputs (NARMAX) models in capturing dynamic relationships in processes with correlated inputs. Based on these results, wiener models have been applied in the modeling of BGC for real subjects with Type 1 diabetes under free-living conditions. With promising results shown in wiener models, an extended physiologically based model (i.e. semi-coupled model) has been developed from wiener structure, which enables the development of a phenomenologically sound feedforward control law. The feedforward control law based on wiener models has been tested in simulated continuous-stirred-tank reactor (CSTR) that demonstrates tight control of controlled variables. Further simulation runs with a CSTR also shows feedforward predictive control (FFPC) can provide tighter control over model predictive control (MPC). Lastly, for the special application of BGC control for people with Type 1 diabetes, FFPC demonstrates tighter control than MPC under simulation environment. To account for unmeasured disturbances and inaccurate models for manipulated variable in real life scenarios, feedback predictive control (FBPC) is developed and proven to be a more effective control algorithm under both CSTR and diabetes simulation environment, which can establish the foundation for tightening BGC in real subject clinical studies.
Subjects/Keywords: Artificial pancreas; Diabetes mellitus; Dynamic modeling; Feedforward control; Model predictive control; Virtual sensors; Chemical Engineering; Statistics and Probability
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Export
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Manager
APA (6th Edition):
Mei, Y. (2017). Modeling and control to improve blood glucose concentration for people with diabetes. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/16102
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mei, Yong. “Modeling and control to improve blood glucose concentration for people with diabetes.” 2017. Thesis, Iowa State University. Accessed March 04, 2021.
https://lib.dr.iastate.edu/etd/16102.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mei, Yong. “Modeling and control to improve blood glucose concentration for people with diabetes.” 2017. Web. 04 Mar 2021.
Vancouver:
Mei Y. Modeling and control to improve blood glucose concentration for people with diabetes. [Internet] [Thesis]. Iowa State University; 2017. [cited 2021 Mar 04].
Available from: https://lib.dr.iastate.edu/etd/16102.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mei Y. Modeling and control to improve blood glucose concentration for people with diabetes. [Thesis]. Iowa State University; 2017. Available from: https://lib.dr.iastate.edu/etd/16102
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
20.
LI XIAN.
NEW METHODS FOR FEEDFORWARD CONTROL WITH APPLICATIONS TO THE LIQUID DESICCANT DEHUMIDIFICATION SYSTEM.
Degree: 2016, National University of Singapore
URL: http://scholarbank.nus.edu.sg/handle/10635/134420
Subjects/Keywords: Liquid desiccant; Air dehumidification; Modelling; Control; Feedforward control
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APA (6th Edition):
XIAN, L. (2016). NEW METHODS FOR FEEDFORWARD CONTROL WITH APPLICATIONS TO THE LIQUID DESICCANT DEHUMIDIFICATION SYSTEM. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/134420
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
XIAN, LI. “NEW METHODS FOR FEEDFORWARD CONTROL WITH APPLICATIONS TO THE LIQUID DESICCANT DEHUMIDIFICATION SYSTEM.” 2016. Thesis, National University of Singapore. Accessed March 04, 2021.
http://scholarbank.nus.edu.sg/handle/10635/134420.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
XIAN, LI. “NEW METHODS FOR FEEDFORWARD CONTROL WITH APPLICATIONS TO THE LIQUID DESICCANT DEHUMIDIFICATION SYSTEM.” 2016. Web. 04 Mar 2021.
Vancouver:
XIAN L. NEW METHODS FOR FEEDFORWARD CONTROL WITH APPLICATIONS TO THE LIQUID DESICCANT DEHUMIDIFICATION SYSTEM. [Internet] [Thesis]. National University of Singapore; 2016. [cited 2021 Mar 04].
Available from: http://scholarbank.nus.edu.sg/handle/10635/134420.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
XIAN L. NEW METHODS FOR FEEDFORWARD CONTROL WITH APPLICATIONS TO THE LIQUID DESICCANT DEHUMIDIFICATION SYSTEM. [Thesis]. National University of Singapore; 2016. Available from: http://scholarbank.nus.edu.sg/handle/10635/134420
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
21.
KIEW CHOON MENG.
Control of Resist Processing in Lithography.
Degree: 2008, National University of Singapore
URL: http://scholarbank.nus.edu.sg/handle/10635/28185
Subjects/Keywords: Thickness Estimation; Develop Step; Process Control; Feedforward Control; Minimax
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APA (6th Edition):
MENG, K. C. (2008). Control of Resist Processing in Lithography. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/28185
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
MENG, KIEW CHOON. “Control of Resist Processing in Lithography.” 2008. Thesis, National University of Singapore. Accessed March 04, 2021.
http://scholarbank.nus.edu.sg/handle/10635/28185.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
MENG, KIEW CHOON. “Control of Resist Processing in Lithography.” 2008. Web. 04 Mar 2021.
Vancouver:
MENG KC. Control of Resist Processing in Lithography. [Internet] [Thesis]. National University of Singapore; 2008. [cited 2021 Mar 04].
Available from: http://scholarbank.nus.edu.sg/handle/10635/28185.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
MENG KC. Control of Resist Processing in Lithography. [Thesis]. National University of Singapore; 2008. Available from: http://scholarbank.nus.edu.sg/handle/10635/28185
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
22.
Khalate, A.A.
Model-based Feedforward Control for Inkjet Printheads.
Degree: 2013, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a
;
urn:NBN:nl:ui:24-uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a
;
urn:NBN:nl:ui:24-uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a
;
http://resolver.tudelft.nl/uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a
► In recent years, inkjet technology has emerged as a promising manufacturing tool. This technology has gained its popularity mainly due to the facts that it…
(more)
▼ In recent years, inkjet technology has emerged as a promising manufacturing tool. This technology has gained its popularity mainly due to the facts that it can handle diverse materials and it is a non-contact and additive process. Moreover, the inkjet technology offers low operational costs, easy scalability, digital
control and low material waste. Thus, apart from conventional document printing, the inkjet technology has been successfully applied as a micro-manufacturing tool in the areas of electronics, mechanical engineering, and life sciences. In this thesis, we investigate a piezo-based drop-on-demand (DoD) printhead which is commonly used for industrial and commercial applications due to its ability to handle diverse materials. A typical drop-on-demand (DoD) inkjet printhead consists of several ink channels in parallel. Each ink channel is provided with a piezo-actuator which on the application of an actuation voltage pulse, generates pressure oscillations inside the ink channel. These pressure oscillations push the ink drop out of the nozzle. The print quality delivered by an inkjet printhead depends on the properties of the jetted drop, i.e., the drop velocity, the drop volume and the jetting direction. To meet the challenging performance requirements posed by new applications, these drop properties have to be tightly controlled. The performance of the inkjet printhead is limited by two factors. The first one is the residual pressure oscillations. The actuation pulses are designed to provide an ink drop of a specified volume and velocity under the assumption that the ink channel is in a steady state. Once the ink drop is jetted the pressure oscillations inside the ink channel take several micro-seconds to decay. If the next ink drop is jetted before these residual pressure oscillations have decayed, the resulting drop properties will be different from the ones of the previous drop. The second limiting factor is the cross-talk. The drop properties through an ink channel are affected when the neighboring channels are actuated simultaneously. Generally, the drop consistency is improved by manual tuning of the piezo actuation pulse based on some physical insight or based on exhaustive experimental studies on the printhead. However, these ad-hoc procedures have proved to be insufficient in dealing with the above limitations. In this thesis, a model-based
control approach is proposed to improve the performance of a DoD inkjet printhead. It offers a systematic and efficient means to improve the attainable performance of a DoD inkjet printhead by reducing the effect of the residual oscillations and the cross-talk. Furthermore, the models that have been developed for this purpose can also give new insights into the operation of the printhead. In order to achieve this goal, it is required to have a fairly accurate and simple model of an inkjet printhead. It is not easy to obtain a good physical model for an inkjet printhead due to insufficient knowledge of the complex interactions in the printhead. Therefore, in this…
Advisors/Committee Members: Babuska, R., Bombois, X..
Subjects/Keywords: inkjet printhead; identification; feedforward control; robust control; optimization
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APA (6th Edition):
Khalate, A. A. (2013). Model-based Feedforward Control for Inkjet Printheads. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a ; urn:NBN:nl:ui:24-uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a ; urn:NBN:nl:ui:24-uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a ; http://resolver.tudelft.nl/uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a
Chicago Manual of Style (16th Edition):
Khalate, A A. “Model-based Feedforward Control for Inkjet Printheads.” 2013. Doctoral Dissertation, Delft University of Technology. Accessed March 04, 2021.
http://resolver.tudelft.nl/uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a ; urn:NBN:nl:ui:24-uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a ; urn:NBN:nl:ui:24-uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a ; http://resolver.tudelft.nl/uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a.
MLA Handbook (7th Edition):
Khalate, A A. “Model-based Feedforward Control for Inkjet Printheads.” 2013. Web. 04 Mar 2021.
Vancouver:
Khalate AA. Model-based Feedforward Control for Inkjet Printheads. [Internet] [Doctoral dissertation]. Delft University of Technology; 2013. [cited 2021 Mar 04].
Available from: http://resolver.tudelft.nl/uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a ; urn:NBN:nl:ui:24-uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a ; urn:NBN:nl:ui:24-uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a ; http://resolver.tudelft.nl/uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a.
Council of Science Editors:
Khalate AA. Model-based Feedforward Control for Inkjet Printheads. [Doctoral Dissertation]. Delft University of Technology; 2013. Available from: http://resolver.tudelft.nl/uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a ; urn:NBN:nl:ui:24-uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a ; urn:NBN:nl:ui:24-uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a ; http://resolver.tudelft.nl/uuid:d063dfb9-6ec6-4c43-b315-fb98a576498a
Virginia Tech
23.
Li, Zhonglin.
Design of Active Structure Acoustic Control Systems Using Eigenassignment Approach.
Degree: PhD, Mechanical Engineering, 1997, Virginia Tech
URL: http://hdl.handle.net/10919/29269
► Active structural acoustic control (ASAC) in conjunction with the adaptive feedforward control has been proved to be an efficient practical approach to reduce structure-borne sound.…
(more)
▼ Active structural acoustic
control (ASAC) in conjunction with the adaptive
feedforward control has been proved to be an efficient practical approach to reduce structure-borne sound. ASAC works on the principles of reducing the vibration amplitude of the structure (modal reduction), as well as changing the vibration distributions of the structure so that the vibration distributions of each structural modes destructively interfere with one another in their associated radiating acoustic field (modal restructuring). Based on these observations, two different but related design strategies, namely the non-volumetric design and the minimum supersonic wavenumber design, were developed for designing efficient ASAC system. The eigenassignment method for
feedforward control system serves as the fundamental design tool for both formulations.
In this study, the dynamic characteristics of a multiple-input, multiple-output (MIMO)
feedforward controlled system was investigated both analytically and experimentally on a simply supported plate under harmonic excitation. It was demonstrated that, when the
control system has equal number of
control inputs and error sensor outputs, the
feedforward controller can effectively modify the system dynamics (i.e., resonance frequencies and mode shapes). This provides the theoretical basis for the eigenassignment method.
For the non-volumetric design, the single-input, single-output (SISO) eigenassignment technique is used to modify the eigenproperties of a planar structure using structure actuators and sensors so that all the controlled modes are non-volumetric (inefficient sound radiators at low frequencies, i.e., k_0a << 1), leading large global sound attenuation in the far field. The effectiveness of this formulation was demonstrated through numerical simulations for the
control of radiation from simply supported and clamped-free beams. The experimental validation of the non-volumetric design was also carried out on a simply supported beam using PZT actuators and shaped PVDF film as error sensor. The filtered-x LMS algorithm was used in the experiment. Excellent global sound attenuation was achieved in the low frequencies.
The minimum supersonic wavenumber design stems from the fact that only supersonic wavenumber components of the structural velocity spectra radiate to the far field. A SISO eigenassignment technique is used to modify the eigenproperties of a planar structure so that the eigenfunctions of the controlled system have minimum supersonic wavenumber in the frequency range of study. The sound pressure or sound power radiated by the structure is therefore reduced. The design was demonstrated on a simply supported beam to minimize the supersonic wavenumber components contributed by the odd-order modes only. Significant global sound attenuation was achieved in the frequency range of study.
The main advantage of the proposed design methods is that they do not depend on the characteristics of the external disturbance, such as the form, location and frequency contents. Also, the…
Advisors/Committee Members: Fuller, Christopher R. (committeechair), Robertshaw, Harry H. (committee member), Cudney, Harley H. (committee member), Baumann, William T. (committee member), Burdisso, Ricardo A. (committee member).
Subjects/Keywords: Feedforward Control; Active Structural Acoustic Control; Structural Acoustics
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APA ·
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APA (6th Edition):
Li, Z. (1997). Design of Active Structure Acoustic Control Systems Using Eigenassignment Approach. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/29269
Chicago Manual of Style (16th Edition):
Li, Zhonglin. “Design of Active Structure Acoustic Control Systems Using Eigenassignment Approach.” 1997. Doctoral Dissertation, Virginia Tech. Accessed March 04, 2021.
http://hdl.handle.net/10919/29269.
MLA Handbook (7th Edition):
Li, Zhonglin. “Design of Active Structure Acoustic Control Systems Using Eigenassignment Approach.” 1997. Web. 04 Mar 2021.
Vancouver:
Li Z. Design of Active Structure Acoustic Control Systems Using Eigenassignment Approach. [Internet] [Doctoral dissertation]. Virginia Tech; 1997. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10919/29269.
Council of Science Editors:
Li Z. Design of Active Structure Acoustic Control Systems Using Eigenassignment Approach. [Doctoral Dissertation]. Virginia Tech; 1997. Available from: http://hdl.handle.net/10919/29269
Università degli Studi di Bergamo
24.
ROSSETTI, Mattia.
Un approccio meccatronico per la progettazione e lo sviluppo di sistemi di controllo in asservimento visivo.
Degree: 2015, Università degli Studi di Bergamo
URL: http://hdl.handle.net/10446/51779
► Modern robots and mechatronic systems are equipped with a large number of sensors which give them the possibility to accomplish complex tasks. In recent years…
(more)
▼ Modern robots and mechatronic systems are equipped with a large number of sensors which give them the possibility to accomplish complex tasks. In recent years the integration of robots and vision system has become critical to improve machinery productivity and versatility. Nevertheless, the most widely used approach is still the "look then move" fashion, in which the vision system simply supports a manipulator without taking part in the robot
control task. An alternative technique that allows to merge the vision task and the
control one is named "visual servoing" or "vision in the loop". Following this approach, a visual-feedback loop can be added to the standard manipulator
control loop in order to drive the robot directly with the information coming from the vision system.
This further controller brings a lot of benefits including: (i) a general increase of the accuracy of the subsystem and its robustness towards environment noise and changes; (ii) the capability to follow fast moving objects; (iii) the possibility to adapt the system to different situations and tasks. On the contrary hand, designing and developing an
efficient and robust visual
control is tipically a difficult task as it involves various issues like computer vision lgorithms,
control theory, robot kinematics and so on. The analysis carried out in this thesis aims to highlight the
aspects common to all visual servoing tasks in order to provide a general solution schema for this kind of problems. Firstly, the image acquisition process and image elaboration techniques are presented, with particular attention to their application to "tracking" fast moving objects or scenes; secondly, visual servoing controller design is ntroduced and its kinematic and dynamic issues are studied; eventually, a software architecture for the mplementation of visually guided task is shown along with simple experimental applications used to evaluate
the results of the work.
Advisors/Committee Members: RIGHETTINI, Paolo.
Subjects/Keywords: Visual Servoing, Image Sensors, Computer Vision, Robot Control, Digital Control, Feedback Control, Feedforward Control, Control System Design, Control System Simulation, Software Design; ING-IND/13 - Meccanica Applicata alle Macchine
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APA (6th Edition):
ROSSETTI, M. (2015). Un approccio meccatronico per la progettazione e lo sviluppo di sistemi di controllo in asservimento visivo. (Thesis). Università degli Studi di Bergamo. Retrieved from http://hdl.handle.net/10446/51779
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
ROSSETTI, Mattia. “Un approccio meccatronico per la progettazione e lo sviluppo di sistemi di controllo in asservimento visivo.” 2015. Thesis, Università degli Studi di Bergamo. Accessed March 04, 2021.
http://hdl.handle.net/10446/51779.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
ROSSETTI, Mattia. “Un approccio meccatronico per la progettazione e lo sviluppo di sistemi di controllo in asservimento visivo.” 2015. Web. 04 Mar 2021.
Vancouver:
ROSSETTI M. Un approccio meccatronico per la progettazione e lo sviluppo di sistemi di controllo in asservimento visivo. [Internet] [Thesis]. Università degli Studi di Bergamo; 2015. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10446/51779.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
ROSSETTI M. Un approccio meccatronico per la progettazione e lo sviluppo di sistemi di controllo in asservimento visivo. [Thesis]. Università degli Studi di Bergamo; 2015. Available from: http://hdl.handle.net/10446/51779
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Linköping University
25.
Törnroth, Oscar.
Design and Implementation of a Strategy for Path Tracking on Autonomous Heavy-Duty Vehicles.
Degree: Vehicular Systems, 2018, Linköping University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-149266
► In this thesis, a combined feedforward and feedback controller for improved path tracking on autonomous heavy-duty vehicles is designed and implemented. The steering wheel…
(more)
▼ In this thesis, a combined feedforward and feedback controller for improved path tracking on autonomous heavy-duty vehicles is designed and implemented. The steering wheel is controlled in order to follow a reference curvature, computed by a higher-level MPC, responsible for minimizing the distance to a planned path. The steering dynamics, from steering wheel via wheel angles, to a measurable vehicle curvature, is modeled, and a conversion from desired curvature gain to input angle to the steering wheel is derived. Tests with an autonomous Scania R580 show that the desired curvature can be followed with satisfactory small error, both in a designed slalom path and on a more generic test track. By utilizing future curvature values computed by the MPC, a non-causal feedforward controller can reduce the delay from input to the steering wheel to a measured response in curvature, by almost two thirds, compared to the currently implemented solution. Compared to an open-loop control design, tests in simulation show that a feedback controller can reduce errors in curvature gain. However, with the identified steering dynamics and the improved conversion from steering wheel angle to curvature, no further improvement in the curvature gain was seen when implementing the feedback controller in the test vehicle. Care must also be taken not to introduce instability in the system when the feedback controller is implemented in series with a high-level MPC.
Den här rapporten beskriver design och implementering av en regulator med kombinerad framkoppling och återkoppling för förbättrad banföljning av autonoma tunga fordon. Fordonets ratt styrs för att följa en kurvaturreferens beräknad av en överordnad MPC, ansvarig för att minimera avståndet till en planerad bana. Dynamiken i styrningen, från ratten via hjulvinklarna till en mätbar kurvatur för fordonet, är modellerad. En översättning från önskad förstärkning av kurvatur till insignal för rattvinkeln är också framtagen. Tester utförda med en autonom Scania R580 visar att den önskade kurvaturen kan följas med tillfredsställande litet fel, både i en egendesignad slalombana och i en mer generisk testbana. Genom att utnyttja framtida referensvärden för kurvatur beräknade av MPC:n, kan en icke-kausal framkopplande regulator minska fördröjningen från insignal till ratten till en mätbar respons i fordonets kurvatur. Jämfört med den nuvarande lösningen minskas fördröjningen med nästan två tredjedelar. Jämfört med en öppen styrning visar tester i simulering att en återkoppling i regulatorn kan minska stationära fel i kurvatur. Med implementeringen av den identifierade styrdynamiken och den förbättrade översättningen från rattvinkel till kurvatur, syntes dock med återkoppling ingen ytterliggare förbättring i testfordonet. Implementering av den återkopplande regulatorn i serie med den överordnade MPC:n behöver också göras med omsorg för att inte introducera instabilitet i systemet.
Subjects/Keywords: Control Engineering; Control Architecture; Autonomous Vehicles; Heavy-Duty Vehicles; Motion Control; Path Tracking; Curvature Tracking; Lateral Control; Steering Systems; Feedforward Control Systems; System Identification; Understeering; Control Engineering; Reglerteknik
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APA (6th Edition):
Törnroth, O. (2018). Design and Implementation of a Strategy for Path Tracking on Autonomous Heavy-Duty Vehicles. (Thesis). Linköping University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-149266
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Törnroth, Oscar. “Design and Implementation of a Strategy for Path Tracking on Autonomous Heavy-Duty Vehicles.” 2018. Thesis, Linköping University. Accessed March 04, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-149266.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Törnroth, Oscar. “Design and Implementation of a Strategy for Path Tracking on Autonomous Heavy-Duty Vehicles.” 2018. Web. 04 Mar 2021.
Vancouver:
Törnroth O. Design and Implementation of a Strategy for Path Tracking on Autonomous Heavy-Duty Vehicles. [Internet] [Thesis]. Linköping University; 2018. [cited 2021 Mar 04].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-149266.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Törnroth O. Design and Implementation of a Strategy for Path Tracking on Autonomous Heavy-Duty Vehicles. [Thesis]. Linköping University; 2018. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-149266
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
26.
Khoshroo, Parya.
Control System and Graphical User Interface Design of an Upper-Extremity Rehabilitation Robot.
Degree: 2020, University of Waterloo
URL: http://hdl.handle.net/10012/16584
► Stroke is one of the leading causes of death, physical disability, and loss of brain functionality each year, especially amongst older adults. The ability to…
(more)
▼ Stroke is one of the leading causes of death, physical disability, and loss of brain functionality each year, especially amongst older adults. The ability to access good quality post-stroke rehabilitation exercises is essential for stroke survivors to maximize their potential to regain skills and physical abilities. Robot-assisted therapy is showing promise as a way to provide stroke survivors with engaging, challenging, and repetitive tasks while delivering measured therapy that is able to objectively evaluate patients’ progress. Among several challenges that are associated with the design of rehabilitation robots (e.g., the mechanical structure, the actuator types, the control strategies), the design of the control strategy is one of the most critical. Depending on the type of patient and the severity of the impairment of motor control, various control strategies could be applied
for the recovery of the impaired limb in stroke survivors using robot-assisted therapy.
Research is needed into the development of how best to control rehabilitation robots; this
includes both the internal control algorithms and the User Interface (UI) for therapists.
As such, the first objective of this research is to design and implement a motion controller and force-field controller for a 2-Degree of Freedom (DOF) manipulandum upper-extremity rehabilitation robot that is able to deliver planar rehabilitation exercises for stroke survivors while taking therapeutic rehabilitation goals into account. The motion
control algorithm can precisely follow a prescribed time-dependent trajectory whereas the
force-control method will only provide assistance (or even resistance to introduce extra
challenge) to the patient to do the task rather than forcing the movement. For doing the simulation studies, a motor control model of post-stroke patients was proposed. The effectiveness of these controllers was explored in simulations and it was observed that the developed force-field algorithm had a positive effect on the motor control recovery for a
simulated patient. The simulation results also indicated that the resistive mode of therapy would result in better outcomes after the therapy which aligns with experimental studies by other researchers. In addition, a novel adaptive algorithm was proposed for fine-tuning the proposed force-field parameters based on the performance of the patient during the therapy as a subject specific controller can help to achieve a desirable performance for each patient. While this approach is promising, the effectiveness of the adaptation rule has yet to be evaluated on real patients in the future.
To enable effective access and use of the robot, the controller needs to be visualized through a Graphical User Interface (GUI) in a way that therapists can understand and use. The second goal of this thesis research was to work with therapists to collaboratively design an intuitive to use GUI for therapists to control the robot and provide objective information on patients’ performance. The identification of…
Subjects/Keywords: robotics; robot control; force-field control; motion control; pid controller; feedback-feedforward controller; rehabilitation robots; robot-assisted therapy; stroke rehabilitation; graphical user interface; interface design; collaborative interface design; control systems
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APA (6th Edition):
Khoshroo, P. (2020). Control System and Graphical User Interface Design of an Upper-Extremity Rehabilitation Robot. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/16584
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Khoshroo, Parya. “Control System and Graphical User Interface Design of an Upper-Extremity Rehabilitation Robot.” 2020. Thesis, University of Waterloo. Accessed March 04, 2021.
http://hdl.handle.net/10012/16584.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Khoshroo, Parya. “Control System and Graphical User Interface Design of an Upper-Extremity Rehabilitation Robot.” 2020. Web. 04 Mar 2021.
Vancouver:
Khoshroo P. Control System and Graphical User Interface Design of an Upper-Extremity Rehabilitation Robot. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10012/16584.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Khoshroo P. Control System and Graphical User Interface Design of an Upper-Extremity Rehabilitation Robot. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/16584
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Michigan
27.
Daoutidis, Prodromos.
Synthesis of feedforward/feedback control systems for nonlinear processes.
Degree: PhD, Chemical engineering, 1991, University of Michigan
URL: http://hdl.handle.net/2027.42/128744
► In this thesis, the unified problem of disturbance rejection and output tracking for general nonlinear processes is studied, using methods from differential geometry. An analysis…
(more)
▼ In this thesis, the unified problem of disturbance rejection and output tracking for general nonlinear processes is studied, using methods from differential geometry. An analysis framework is initially established, through a detailed study of the concept of relative order. The general problem of disturbance rejection and output tracking is formulated as a
feedforward/feedback
control problem, and is addressed first for single-input single-output processes and then for multiple-input multiple-output processes.
Feedforward/state feedback laws are synthesized that completely eliminate the effect of measured disturbances on the controlled outputs and induce a well-characterized linear input/output behavior. A general
feedforward/feedback
control structure is developed that also accounts for modeling error and unmeasured disturbances. The developed
control methodology is applied to composition
control in a cascade of chemical reactors and to temperature and number average molecular weight
control in a continuous polymerization reactor. On the basis of the properties of relative order and the controller synthesis results, the problem of synthesis of
control configurations is also addressed. A general framework for the structural evaluation of alternative
control configurations is developed, based on fundamental structural limitations in the
control quality and structural coupling considerations. The developed evaluation framework is applied to the synthesis of
control configurations in an evaporation unit, a continuous chemical reactor and a heat-exchanger network.
Advisors/Committee Members: Kravaris, Costas (advisor).
Subjects/Keywords: Control; Feedback; Feedforward; Nonlinear; Processes; Synthesis; Systems
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APA (6th Edition):
Daoutidis, P. (1991). Synthesis of feedforward/feedback control systems for nonlinear processes. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/128744
Chicago Manual of Style (16th Edition):
Daoutidis, Prodromos. “Synthesis of feedforward/feedback control systems for nonlinear processes.” 1991. Doctoral Dissertation, University of Michigan. Accessed March 04, 2021.
http://hdl.handle.net/2027.42/128744.
MLA Handbook (7th Edition):
Daoutidis, Prodromos. “Synthesis of feedforward/feedback control systems for nonlinear processes.” 1991. Web. 04 Mar 2021.
Vancouver:
Daoutidis P. Synthesis of feedforward/feedback control systems for nonlinear processes. [Internet] [Doctoral dissertation]. University of Michigan; 1991. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/2027.42/128744.
Council of Science Editors:
Daoutidis P. Synthesis of feedforward/feedback control systems for nonlinear processes. [Doctoral Dissertation]. University of Michigan; 1991. Available from: http://hdl.handle.net/2027.42/128744
University of Saskatchewan
28.
Bone, Mackenzie Dior 1995-.
Investigating proactive balance control in individuals with incomplete spinal cord injury while walking on a known slippery surface.
Degree: 2019, University of Saskatchewan
URL: http://hdl.handle.net/10388/12455
► BACKGROUND: Falls are a growing concern among individuals with incomplete spinal cord injury (iSCI). As many as 83% of individuals with iSCI experience at least…
(more)
▼ BACKGROUND: Falls are a growing concern among individuals with incomplete spinal cord injury (iSCI). As many as 83% of individuals with iSCI experience at least one fall per year. Most outdoor falls occur while walking on uneven or slippery surfaces. Individuals with iSCI employ proactive balance strategies to a greater extent than able-bodied (AB) individuals during normal walking, which is effective in reducing the intensity of an unexpected slip. Whether individuals with iSCI can use proactive balance strategies in a
feedforward manner to adapt to expected slip perturbations and reduce slip/fall potential while walking has not been assessed.
METHODS:19 individuals with iSCI (AIS D; 14 males; 61.01 ± 17.67 years) and 17 age- and sex-matched AB individuals (13 males; 60.86 ± 17.79 years) were included in the study. Low-friction steel rollers were used to induce a slip in the anterior-posterior (AP) direction. Participants completed three walking conditions: normal walking trials (NW), one unexpected slip trial (US), and four expected slip (ES) trials. Changes in kinematic and electromyography (EMG) data were analyzed to give an indication of
feedforward adaptations to the slip. Outcome variables included step width, step length, center of mass (COM) velocity, foot-floor angle, medial-lateral and AP margin of stability (MOS), maximum post-slip velocity (PSV), and integrated EMG for tibialis anterior (TA), soleus (SOL), and gluteus RESULTS: Individuals with iSCI used
feedforward behavioural strategies to a greater extent than AB individuals while approaching a known slippery surface including walking with shorter steps, a flatter foot-floor angle, a more anteriorly positioned COM, and slower COM velocity. AB and iSCI groups made similar changes in their muscle activity to proactively prepare for the ES trials. The main difference between groups was a reduced ability of individuals with iSCI to proactively modulate the amplitude of the trail SOL muscle compared to AB individuals. Both AB and iSCI groups were able to make significant
feedforward adjustments to behaviour and muscle activity within 1-2 trials after experiencing an US. These proactive balance strategies were effective at reducing the maximum PSV and thus the slip/fall potential in both groups.
CONCLUSIONS: Results demonstrate that individuals with iSCI maintain the ability to make appropriate
feedforward changes in behavior and muscle activity and do so in a similar manner to AB individuals.
Advisors/Committee Members: Oates, Alison R, Linassi, Gary A, Lanovaz, Joel L, Musselman, Kristin E, Duclos, Cyril.
Subjects/Keywords: Spinal cord injury; walking; balance control; proactive strategies; feedforward adaptations; biomechanics; margin of stability; slip perturbation
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APA (6th Edition):
Bone, M. D. 1. (2019). Investigating proactive balance control in individuals with incomplete spinal cord injury while walking on a known slippery surface. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12455
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bone, Mackenzie Dior 1995-. “Investigating proactive balance control in individuals with incomplete spinal cord injury while walking on a known slippery surface.” 2019. Thesis, University of Saskatchewan. Accessed March 04, 2021.
http://hdl.handle.net/10388/12455.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bone, Mackenzie Dior 1995-. “Investigating proactive balance control in individuals with incomplete spinal cord injury while walking on a known slippery surface.” 2019. Web. 04 Mar 2021.
Vancouver:
Bone MD1. Investigating proactive balance control in individuals with incomplete spinal cord injury while walking on a known slippery surface. [Internet] [Thesis]. University of Saskatchewan; 2019. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10388/12455.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bone MD1. Investigating proactive balance control in individuals with incomplete spinal cord injury while walking on a known slippery surface. [Thesis]. University of Saskatchewan; 2019. Available from: http://hdl.handle.net/10388/12455
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Purdue University
29.
Geesey, Bryce A.
Utilizing tunable signal interference control topologies with electromechanical resonators.
Degree: MSME, Mechanical Engineering, 2016, Purdue University
URL: http://docs.lib.purdue.edu/open_access_theses/770
► Exploiting knowledge gained from previous investigations of channelized and trans-versal filters, signal interference filters use transmission line differences to generate transmission zeros through phase-shifted…
(more)
▼ Exploiting knowledge gained from previous investigations of channelized and trans-versal filters, signal interference filters use transmission line differences to generate transmission zeros through phase-shifted combinations of signals at the output of a device. The transmission lines used in these circuits are straightforward to design, but are limited to high-frequency signals (on the order of a few gigahertz) due to the necessity for spatial compactness and low loss. More recent studies have used electromechanical resonators to achieve phase shifting and quality factor improvements at slightly-lower frequencies. These concepts may prove useful if extended to micro- and nanoscale resonators.
To explore signal interference topologies outside of purely-electrical, high-frequency filtering domains, a generic system model is proposed herein, which is based upon high quality factor resonant elements and continuously-tunable amplitude and phase components. The mathematical models developed in this work are generalized to apply the concept of signal interference to a variety of linear resonant systems. With this approach, frequency response behaviors can be quickly modified from amplification to cancellation through appropriate tuning of the phase and gain components.
The analytical models are simulated and implemented in electromechanical circuitry as a first step towards system integration. The prototypical circuits qualitatively match the desired frequency response and tuning behaviors, proving the use of the mathematical models in the design of linear resonant signal interference systems.
Advisors/Committee Members: Jeffrey F. Rhoads, Jeffrey F. Rhoads, Charles M. Krousgrill, George T.-C. Chiu.
Subjects/Keywords: Applied sciences; Electromechanical systems; Feedforward control; Frequency response tuning; Mems and nems; Signal interference; Mechanical Engineering
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APA (6th Edition):
Geesey, B. A. (2016). Utilizing tunable signal interference control topologies with electromechanical resonators. (Thesis). Purdue University. Retrieved from http://docs.lib.purdue.edu/open_access_theses/770
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Geesey, Bryce A. “Utilizing tunable signal interference control topologies with electromechanical resonators.” 2016. Thesis, Purdue University. Accessed March 04, 2021.
http://docs.lib.purdue.edu/open_access_theses/770.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Geesey, Bryce A. “Utilizing tunable signal interference control topologies with electromechanical resonators.” 2016. Web. 04 Mar 2021.
Vancouver:
Geesey BA. Utilizing tunable signal interference control topologies with electromechanical resonators. [Internet] [Thesis]. Purdue University; 2016. [cited 2021 Mar 04].
Available from: http://docs.lib.purdue.edu/open_access_theses/770.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Geesey BA. Utilizing tunable signal interference control topologies with electromechanical resonators. [Thesis]. Purdue University; 2016. Available from: http://docs.lib.purdue.edu/open_access_theses/770
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
30.
Al Hamidi, Yasser.
Multivariable feedforward control of vibrations in multi-axes flexible structures : applications to multi-axes piezoelectric actuators : Commande en boucle ouverte des systèmes mal amortis : applications aux microsystèmes piézoélectriques.
Degree: Docteur es, Automatique, 2017, Bourgogne Franche-Comté
URL: http://www.theses.fr/2017UBFCD016
► Les actionneurs multi-axes sont de plus en plus prisés par les concepteurs de systèmes de nanopositionnement car ils permettent une réduction de l'espace occupé et…
(more)
▼ Les actionneurs multi-axes sont de plus en plus prisés par les concepteurs de systèmes de nanopositionnement car ils permettent une réduction de l'espace occupé et de l'énergie consommée, une dextérité plus grande et une modularité avec peu de contraintes pour les applications. Certains de ces actionneurs et systèmes multi-axes sont cependant caractérisés par des oscillations mal-amorties qui compromettent de manière drastique leurs performances générales. Cette thèse concerne l'exploitation des techniques de commande en boucle-ouverte input-shaping classiquement utilisées pour amortir de manière sans capteurs les oscillations dans les systèmes mono-axes et les étendent pour qu'ils soient utilisables pour les systèmes multi-axes. Les résultats proposés dans la thèse qui sont des techniques input-shaping multivariables sont ensuite appliquées sur des actionneurs piézoélectriques classiquement dédiés pour les applications de nanopositionnement.
Multi-axes actuators are becoming more and more tempting to nanopositioning system designers as they enable them to save space, reduce energy consumption, increase dexterity and offer more modularity and freedom with fewer constraints to their applications. Some of these multi-axes actuators and systems exhibit however badly damped vibrations which strongly compromise their global performances. This thesis work exploits the advantages of the well-known feedforward input shaping techniques usually used to damp vibrations in monovariable (SISO) systems to present a new multivariable (MIMO) input shaping technique that can be used to damp vibrations in multi-axes systems. The approach that was used in this study is to extend a previous work that was done on multiple-input single-output (MISO) systems and generalize it for MIMO systems. The study demonstrates also the application of this newly developed technique on different piezoelectric actuators commonly used in nanopositioning systems.
Advisors/Committee Members: Rakotondrabe, Micky (thesis director).
Subjects/Keywords: Oscillations mal amorties; Commande en boucle ouvert; Actionneurs piezoelectriques; Multivariable; Badly damped oscillations; Feedforward control; Piezoelectric actuators; Multivariable; 620; 629.1
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APA ·
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Export
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APA (6th Edition):
Al Hamidi, Y. (2017). Multivariable feedforward control of vibrations in multi-axes flexible structures : applications to multi-axes piezoelectric actuators : Commande en boucle ouverte des systèmes mal amortis : applications aux microsystèmes piézoélectriques. (Doctoral Dissertation). Bourgogne Franche-Comté. Retrieved from http://www.theses.fr/2017UBFCD016
Chicago Manual of Style (16th Edition):
Al Hamidi, Yasser. “Multivariable feedforward control of vibrations in multi-axes flexible structures : applications to multi-axes piezoelectric actuators : Commande en boucle ouverte des systèmes mal amortis : applications aux microsystèmes piézoélectriques.” 2017. Doctoral Dissertation, Bourgogne Franche-Comté. Accessed March 04, 2021.
http://www.theses.fr/2017UBFCD016.
MLA Handbook (7th Edition):
Al Hamidi, Yasser. “Multivariable feedforward control of vibrations in multi-axes flexible structures : applications to multi-axes piezoelectric actuators : Commande en boucle ouverte des systèmes mal amortis : applications aux microsystèmes piézoélectriques.” 2017. Web. 04 Mar 2021.
Vancouver:
Al Hamidi Y. Multivariable feedforward control of vibrations in multi-axes flexible structures : applications to multi-axes piezoelectric actuators : Commande en boucle ouverte des systèmes mal amortis : applications aux microsystèmes piézoélectriques. [Internet] [Doctoral dissertation]. Bourgogne Franche-Comté; 2017. [cited 2021 Mar 04].
Available from: http://www.theses.fr/2017UBFCD016.
Council of Science Editors:
Al Hamidi Y. Multivariable feedforward control of vibrations in multi-axes flexible structures : applications to multi-axes piezoelectric actuators : Commande en boucle ouverte des systèmes mal amortis : applications aux microsystèmes piézoélectriques. [Doctoral Dissertation]. Bourgogne Franche-Comté; 2017. Available from: http://www.theses.fr/2017UBFCD016
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