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University of Newcastle
1.
Chen, Xi.
Sampled-data synchronization control of multi-agent systems.
Degree: PhD, 2015, University of Newcastle
URL: http://hdl.handle.net/1959.13/1294248 
► Research Doctorate - Doctor of Philosophy (PhD)
The collective control of multi-agent systems has attracted more and more researcher's attention in past decades due to…
(more)
▼ Research Doctorate - Doctor of Philosophy (PhD)
The collective control of multi-agent systems has attracted more and more researcher's attention in past decades due to its wide applications in different areas. This thesis mainly studies two aspects of the collective control problems of multi-agent systems, specifically, consensus of linear multi-agent systems and synchronizarion of nonlinear and heterogenous multi-agent systems. Moreover, the controllers designed throughout the whole thesis are in sampled-data versions. For consensus of linear multi-agent systems, I firstly establish a general linear dynamic for each individual, and assume that the communication topology among the agents is fixed. After proposing the sampled-data controller, it is shown that the consensus problem is equivalent to a stability problem of a continuous-time system with a time-varying time delay. Lyapunov-Razumikbin approach is used to deal with the stability problem. I then further consider a more general case where only the union of the communication topologies has a smapping tree and only the measurement output infomration of the agents are available for the controller in sampled-data setup. This problem is proved to be equivalent to a stability problem of a discrete-time system. Lyapunov-based approach is applied to solve it. For synchronization of nonlinear and heterogeneous multi-agents, I solve the problem by two steps. The first step is to design a linear reference model for each individual and to make the reference models reach consensus under the designed controllers. The second step is to design a sampled-data controller for each individual to make the output traching its own reference model. The analysis for consensus of linear MASs can be used directly for step one, thus, I am only concerned with the step two for synchronization of nonlinear and heterogenous multi-agents, and I call this problem in a two-step mannar, that is, I firstly design a continuous dynamic controller and discretize it to the sampled-data version. Throughout the thesis, the aforementioned two main problems will be stated in five chapters. Moreover, the Introduction and Conclusion are at the beginning and the end of the thesis, respectively. The effectiveness of control design framework is supported tepretically by rigorous proof and practically validated by numerical simulation.
Advisors/Committee Members: University of Newcastle. Faculty of Engineering & Built Enviroment, School of Electrical Engineering and Computer Science.
Subjects/Keywords: sampled-data; synchronization; multi-agent systems
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APA (6th Edition):
Chen, X. (2015). Sampled-data synchronization control of multi-agent systems. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1294248
Chicago Manual of Style (16th Edition):
Chen, Xi. “Sampled-data synchronization control of multi-agent systems.” 2015. Doctoral Dissertation, University of Newcastle. Accessed March 04, 2021.
http://hdl.handle.net/1959.13/1294248.
MLA Handbook (7th Edition):
Chen, Xi. “Sampled-data synchronization control of multi-agent systems.” 2015. Web. 04 Mar 2021.
Vancouver:
Chen X. Sampled-data synchronization control of multi-agent systems. [Internet] [Doctoral dissertation]. University of Newcastle; 2015. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1959.13/1294248.
Council of Science Editors:
Chen X. Sampled-data synchronization control of multi-agent systems. [Doctoral Dissertation]. University of Newcastle; 2015. Available from: http://hdl.handle.net/1959.13/1294248
University of Houston
2.
Ramezanifar, Amin 1981-.
Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay.
Degree: PhD, Mechanical Engineering, 2013, University of Houston
URL: http://hdl.handle.net/10657/1381
► In this dissertation we address a variety of problems in filtering and control of dynamic systems with emphasis on their digital implementation. We focus on…
(more)
▼ In this dissertation we address a variety of problems in filtering and control of dynamic systems with emphasis on their digital implementation. We focus on linear parameter varying (LPV) systems which have been widely utilized in engineering applications. LPV systems include a class of linear systems whose dynamic depends on time-varying parameters. These systems have resulted in significant improvements in the study of time-varying and nonlinear systems.
In a filtering problem, we aim to estimate the states of a dynamic system by utilizing the output measurement of the system. Applications of filters abound in practical and theoretical problems. In a control problem, the objective is to design a controller to ensure the closed-loop system stability and often to satisfy a prescribed level of performance. A main concern in the present study is the implementation of the controller or filter which is often fulfilled by means of a digital device operating in the discrete time domain. Due to the combination of the system continuous-time dynamics and the controller or filter discrete dynamics connected through analog to digital and digital to analog converter devices, the closed-loop system is a hybrid one and is difficult to analyze mathematically. The incorporation of continuous-time and discrete-time signals in a system is often referred to as
sampled-
data system. A particular difficulty in
sampled-
data systems is to ensure that the digital controller (filter) meets the design specifications in between the samples. In this dissertation, we develop new methods to take into account this requirement.
Two chapters of this dissertation are devoted to the design of filters for LPV systems. First, we design a continuous-time filter for a continuous-time state-delayed LPV system whose dynamics includes a time varying delay. Next, we address the
sampled-
data filter design problem for continuous-time LPV systems. In the second part of this dissertation, we investigate the control problem of LPV systems in the framework of
sampled-
data design. First we present a new approach for the
sampled-
data control of continuous-time LPV systems. Next, we extend the established results for LPV systems with internal delay.
Advisors/Committee Members: Grigoriadis, Karolos M. (advisor), Franchek, Matthew A. (committee member), Song, Gangbing (committee member), Nikolaou, Michael (committee member), Rao, Jagannatha R. (committee member), Provence, Robert S. (committee member).
Subjects/Keywords: Linear parameter varying (LPV) systems; Sampled-Data Filtering; Sampled-Data Control; Stability Analysis; Time Delay
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APA (6th Edition):
Ramezanifar, A. 1. (2013). Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/1381
Chicago Manual of Style (16th Edition):
Ramezanifar, Amin 1981-. “Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay.” 2013. Doctoral Dissertation, University of Houston. Accessed March 04, 2021.
http://hdl.handle.net/10657/1381.
MLA Handbook (7th Edition):
Ramezanifar, Amin 1981-. “Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay.” 2013. Web. 04 Mar 2021.
Vancouver:
Ramezanifar A1. Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay. [Internet] [Doctoral dissertation]. University of Houston; 2013. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10657/1381.
Council of Science Editors:
Ramezanifar A1. Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay. [Doctoral Dissertation]. University of Houston; 2013. Available from: http://hdl.handle.net/10657/1381
NSYSU
3.
Chen, Bo-Hsiung.
Sampled-Data LQ Optimal Controller for Twin-Buck Converter.
Degree: Master, Electrical Engineering, 2011, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1012111-215455
► ããWe consider output voltage regulation of a novel twin-buck switching power converters with so-called zero voltage switching (ZVS) and zero current switching (ZCS). In order…
(more)
▼ ããWe consider output voltage regulation of a novel twin-buck switching power converters with so-called zero voltage switching (ZVS) and zero current switching (ZCS). In order to observe the constraints imposed by ZVS and ZCS, it is necessary to adopt the pulse frequency modulation (PFM) technique, which lead to a switching system with aperiodic operating cycles. The control design is based on a
sampled data model of the original switching dynamics and a linear quadratic criterion that takes the at-sampling behaviour into account. The applicability of the proposed controller is validated via numerical simulations written in MATLAB and SIMULINK. The controller is realized using Field Programmable Gate Array (FPGA). The experimental results indicate that the feedback system have good transient response and adequate robustness margin against source and load variation, which verify the applicability of the proposed control design approach.
Advisors/Committee Members: Shiang-Hwua Yu (chair), Chung-Yao Kao (committee member), Chin-S. Moo (chair).
Subjects/Keywords: sampled-data; twin-buck converter; soft-switching; LQR; FPGA; PFM
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APA (6th Edition):
Chen, B. (2011). Sampled-Data LQ Optimal Controller for Twin-Buck Converter. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1012111-215455
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):
Chen, Bo-Hsiung. “Sampled-Data LQ Optimal Controller for Twin-Buck Converter.” 2011. Thesis, NSYSU. Accessed March 04, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1012111-215455.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chen, Bo-Hsiung. “Sampled-Data LQ Optimal Controller for Twin-Buck Converter.” 2011. Web. 04 Mar 2021.
Vancouver:
Chen B. Sampled-Data LQ Optimal Controller for Twin-Buck Converter. [Internet] [Thesis]. NSYSU; 2011. [cited 2021 Mar 04].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1012111-215455.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chen B. Sampled-Data LQ Optimal Controller for Twin-Buck Converter. [Thesis]. NSYSU; 2011. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1012111-215455
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Alberta
4.
Mostafavi, Somayeh.
Fault diagnosis of sampled data systems.
Degree: MS, Department of Electrical and Computer
Engineering, 2011, University of Alberta
URL: https://era.library.ualberta.ca/files/n296wz65n
► This thesis is concerned with fault detection of sampled data systems with special emphasis on the time varying characteristics of the system. A discretization method…
(more)
▼ This thesis is concerned with fault detection of
sampled data systems with special emphasis on the time varying
characteristics of the system. A discretization method based on the
norm invariant transformation is proposed for time invariant
systems with aperiodic sampler and time varying systems with
periodic sampler. The outcome of this transformation for both cases
is a discrete time varying system. This thesis is concerned with
fault detection of sampled data systems with special emphasis on
the time varying characteristics of the system. A discretization
method based on the norm invariant transformation is proposed for
time invariant systems with aperiodic sampler and time varying
systems with periodic sampler. The outcome of this transformation
for both caess is a discrete time varying system. Finally, the
fault detection method with norm invariant transformation is used
for fault diagnosis of network control system with network induced
delay.
Subjects/Keywords: Aperiodic sampler; Time varying; Sampled data; Fault detection
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APA (6th Edition):
Mostafavi, S. (2011). Fault diagnosis of sampled data systems. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/n296wz65n
Chicago Manual of Style (16th Edition):
Mostafavi, Somayeh. “Fault diagnosis of sampled data systems.” 2011. Masters Thesis, University of Alberta. Accessed March 04, 2021.
https://era.library.ualberta.ca/files/n296wz65n.
MLA Handbook (7th Edition):
Mostafavi, Somayeh. “Fault diagnosis of sampled data systems.” 2011. Web. 04 Mar 2021.
Vancouver:
Mostafavi S. Fault diagnosis of sampled data systems. [Internet] [Masters thesis]. University of Alberta; 2011. [cited 2021 Mar 04].
Available from: https://era.library.ualberta.ca/files/n296wz65n.
Council of Science Editors:
Mostafavi S. Fault diagnosis of sampled data systems. [Masters Thesis]. University of Alberta; 2011. Available from: https://era.library.ualberta.ca/files/n296wz65n
University of Waterloo
5.
Rudko, Volodymyr.
Nonlinear Periodic Adaptive Control for Linear Time-Varying Plants.
Degree: 2013, University of Waterloo
URL: http://hdl.handle.net/10012/7775
► In adaptive control the goal is to deal with systems that have unknown and/or time-varying parameters. Adaptive control techniques have been developed since 1950’s and…
(more)
▼ In adaptive control the goal is to deal with systems that have unknown and/or time-varying parameters. Adaptive control techniques have been developed since 1950’s and most results were proven in the cases when the time-variations were non-existent or slow. However the results pertaining to systems with fast time-variations are still limited, in particular, when it comes to plants with unstable zero dynamics.
In this work we adopt the controller design technique from the area of gain scheduling, where the time-varying parameter is assumed to be measurable. We propose the design of a nonlinear periodic controller, where in each period the state and parameter values are estimated and an appropriate stabilizing control signal is applied. It is shown that the closed loop system is stable under fast parameter variations with persistent jumps: the trajectory of the closed loop state in response to the initial condition is bounded by a decaying exponential plus a gain times the size of the noise. Our approach imposes several constraints on the plant; however, we show that there exists at least one interesting class of systems, which includes plants with unstable zero dynamics, that can be stabilized by our controller.
Subjects/Keywords: adaptive control; time-varying systems; sampled-data; nonlinear
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Rudko, V. (2013). Nonlinear Periodic Adaptive Control for Linear Time-Varying Plants. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/7775
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):
Rudko, Volodymyr. “Nonlinear Periodic Adaptive Control for Linear Time-Varying Plants.” 2013. Thesis, University of Waterloo. Accessed March 04, 2021.
http://hdl.handle.net/10012/7775.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rudko, Volodymyr. “Nonlinear Periodic Adaptive Control for Linear Time-Varying Plants.” 2013. Web. 04 Mar 2021.
Vancouver:
Rudko V. Nonlinear Periodic Adaptive Control for Linear Time-Varying Plants. [Internet] [Thesis]. University of Waterloo; 2013. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10012/7775.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rudko V. Nonlinear Periodic Adaptive Control for Linear Time-Varying Plants. [Thesis]. University of Waterloo; 2013. Available from: http://hdl.handle.net/10012/7775
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Newcastle
6.
Carrasco Yanez, Diego S.
Uncertainty issues in deterministic and stochastic nonlinear systems.
Degree: PhD, 2014, University of Newcastle
URL: http://hdl.handle.net/1959.13/1049172
► Research Doctorate - Doctor of Philosophy (PhD)
Robustness issues arise in every real world control problem. The objective of any robust control strategy is to…
(more)
▼ Research Doctorate - Doctor of Philosophy (PhD)
Robustness issues arise in every real world control problem. The objective of any robust control strategy is to preserve closed-loop stability in situations where the real plant differs from the model used to design the controller, i.e. the real system is, in some sense, unknown. There are different ways to quantify, or describe, the uncertainty of a model. It is the amount of uncertainty, or lack of confidence in the model, that ultimately determines, and constrains, what the closed-loop can achieve. In this thesis we address particular issues concerned with how to quantify and reduce the impact of uncertainty. To this end, the present thesis is divided in two parts: The first part is aimed at linear systems. We propose two ideas on how to improve closed-loop performance in the face of general uncertainty, namely, (i) augmenting the control architecture with a feedforward component and (ii) augmenting the observer architecture by using the more general class of unbiased observers. We then illustrate the first strategy applied to an Artificial Pancreas problem. The second part is aimed at nonlinear systems. A common source of uncertainty in this area is the use of approximate sampled-data models of continuous time systems, be it for control design or system identifcation. This is due to the fact that, contrary to the linear case, exact discretisations are not generally possible in the nonlinear case. In particular, we deal with the sampled-data scenario in both deterministic and stochastic cases and focus our attention on accuracy and related properties of sampled-data models. We first study the accuracy properties, or error dynamics, of a particular deterministic sampled data model, and show that it possesses an improved order of accuracy when compared to the usual Euler approximation. We then demonstrate the usefulness of having such a quantification via several applications, namely, (i) obtaining better bias-variance tradeoffs in the parameter estimation of continuous-time systems from sampled-data, (ii) obtaining a sampled-data model that depends only on input-output data that retains the improved order of accuracy, and (iii) obtaining better performance in high-gain sampled-data feedback control of nonlinear systems, via feedback lineraisation. In addition, we extend the analysis to stochastic sampled-data nonlinear systems. In this case, we show that the error dynamics are tightly intertwined with other system properties that arise due to the sampling process. In particular, we show the existence of stochastic sampling zero dynamics that are closely related to the sampling zero dynamics associated with the deterministic case.
Advisors/Committee Members: University of Newcastle..
Subjects/Keywords: nonlinear systems; closed-loop stability; sampled-data models; control design
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APA (6th Edition):
Carrasco Yanez, D. S. (2014). Uncertainty issues in deterministic and stochastic nonlinear systems. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1049172
Chicago Manual of Style (16th Edition):
Carrasco Yanez, Diego S. “Uncertainty issues in deterministic and stochastic nonlinear systems.” 2014. Doctoral Dissertation, University of Newcastle. Accessed March 04, 2021.
http://hdl.handle.net/1959.13/1049172.
MLA Handbook (7th Edition):
Carrasco Yanez, Diego S. “Uncertainty issues in deterministic and stochastic nonlinear systems.” 2014. Web. 04 Mar 2021.
Vancouver:
Carrasco Yanez DS. Uncertainty issues in deterministic and stochastic nonlinear systems. [Internet] [Doctoral dissertation]. University of Newcastle; 2014. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1959.13/1049172.
Council of Science Editors:
Carrasco Yanez DS. Uncertainty issues in deterministic and stochastic nonlinear systems. [Doctoral Dissertation]. University of Newcastle; 2014. Available from: http://hdl.handle.net/1959.13/1049172
University of Melbourne
7.
Fabbro, Mark Anthony.
An Input-Output Framework for Stability and Performance Analysis of Networked Systems.
Degree: 2019, University of Melbourne
URL: http://hdl.handle.net/11343/233215
► A framework is developed for analyzing networked feedback interconnections of dynamical systems. The framework accommodates linear time-invariant open-loop dynamics and a range of digital network…
(more)
▼ A framework is developed for analyzing networked feedback interconnections of dynamical systems. The framework accommodates linear time-invariant open-loop dynamics and a range of digital network characteristics, including uncertain time-varying inter-sample intervals, communication delays, and quantization. The main results relate to integral-quadratic-constraint based descriptions of the uncertainty and non-linearities, and corresponding L2-gain performance certificates. These numerically tractable certificates are parametrized to enable exploration of achievable performance for given network characteristics, and of networking requirements for achieving performance specifications.
Subjects/Keywords: Networked dynamics; robust performance analysis; sampled-data systems
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APA ·
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Manager
APA (6th Edition):
Fabbro, M. A. (2019). An Input-Output Framework for Stability and Performance Analysis of Networked Systems. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/233215
Chicago Manual of Style (16th Edition):
Fabbro, Mark Anthony. “An Input-Output Framework for Stability and Performance Analysis of Networked Systems.” 2019. Doctoral Dissertation, University of Melbourne. Accessed March 04, 2021.
http://hdl.handle.net/11343/233215.
MLA Handbook (7th Edition):
Fabbro, Mark Anthony. “An Input-Output Framework for Stability and Performance Analysis of Networked Systems.” 2019. Web. 04 Mar 2021.
Vancouver:
Fabbro MA. An Input-Output Framework for Stability and Performance Analysis of Networked Systems. [Internet] [Doctoral dissertation]. University of Melbourne; 2019. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/11343/233215.
Council of Science Editors:
Fabbro MA. An Input-Output Framework for Stability and Performance Analysis of Networked Systems. [Doctoral Dissertation]. University of Melbourne; 2019. Available from: http://hdl.handle.net/11343/233215
Ohio University
8.
Wang, Chao.
Aircraft autopilot design using a sampled-data gain
scheduling technique.
Degree: MS, Electrical Engineering & Computer Science
(Engineering and Technology), 1999, Ohio University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1175280078
Aircraft autopilot design using a
sampled-data gain scheduling technique
Advisors/Committee Members: Lawrence, Douglas (Advisor).Subjects/Keywords: Aircraft autopilot; linearization; sampled-data
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APA ·
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APA (6th Edition):
Wang, C. (1999). Aircraft autopilot design using a sampled-data gain
scheduling technique. (Masters Thesis). Ohio University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1175280078
Chicago Manual of Style (16th Edition):
Wang, Chao. “Aircraft autopilot design using a sampled-data gain
scheduling technique.” 1999. Masters Thesis, Ohio University. Accessed March 04, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1175280078.
MLA Handbook (7th Edition):
Wang, Chao. “Aircraft autopilot design using a sampled-data gain
scheduling technique.” 1999. Web. 04 Mar 2021.
Vancouver:
Wang C. Aircraft autopilot design using a sampled-data gain
scheduling technique. [Internet] [Masters thesis]. Ohio University; 1999. [cited 2021 Mar 04].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1175280078.
Council of Science Editors:
Wang C. Aircraft autopilot design using a sampled-data gain
scheduling technique. [Masters Thesis]. Ohio University; 1999. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1175280078
University of Southern California
9.
Qiao, Xinghao.
Sparseness in functional data analysis.
Degree: PhD, Business Administration, 2015, University of Southern California
URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/621510/rec/5981
► Functional Data Analysis (FDA), a branch of statistics that analyzes data providing information about functions measured over some domain, has recently attracted more attention. In…
(more)
▼ Functional
Data Analysis (FDA), a branch of statistics
that analyzes
data providing information about functions measured
over some domain, has recently attracted more attention. In my
thesis, I present a brief overview of FDA and consider three
different settings in FDA where sparseness can play an important
role. ❧ The first setting considers sparseness in the functions.
Classical FDA requires a large number of regularly spaced
measurements per
subject. I consider the situation involving
sparse, irregularly observed and noisy
data. I propose a new
functional errors-in-variable approach, Sparse Index Model
Functional Formulation (SIMFE), which uses a functional index model
formulation to handle sparsely
sampled functional predictors. SIMFE
enjoys several advantages over traditional methods. First, it
implements a non-linear regression and uses a supervised approach
to estimate the lower dimensional space that the predictors should
be projected. Second, SIMFE can be applied to both scalar and
functional responses with multiple predictors. Finally, SIMFES uses
a mixed effect model to deal with sparsely
sampled functional
data.
❧ The other two settings focus on sparseness arising from high
dimensional functional
data, where the number of functional
variables, p, exceeds the number of observations, n. One example
considers extending Gaussian graphical model, which depicts the
conditional dependence structure among p multivariate Gaussian
variables, to the functional domain. Fitting high dimensional
graphical model pose several challenges, thus I need assume
sparseness in the edges, where the edges only connect a subset of
nodes i.e. only some pairs of random variables are conditional
dependent. I propose a functional graphical model (FGM) describing
the conditional dependence structure among p random functions. Then
I develop a fglasso criterion, which estimates FGM by imposing
block sparsity in the precision matrix, via a group lasso penalty.
I show the successful graph recovery with a high probability. ❧ The
other example concerns screening features for ultra-high
dimensional functional
data. To make the problem feasible I assume
extreme sparseness in the predictor space, i.e. most of the
functional predictors are not contributing to the response. I
propose several model-free independence screening procedures to
rank the importance of functional predictors. I compare different
active sets of predictors that these approaches aim to select and
establish the corresponding sure screening properties when the
number of predictors diverges at an exponential rate with the
number of observations. ❧ In each setting, I illustrate the sample
performance of my proposed method through a series of simulations
and a real world
data example.
Advisors/Committee Members: James, Gareth (Committee Chair), Radchenko, Peter (Committee Member), Tong, Xin (Committee Member), Goldstein, Larry (Committee Member).
Subjects/Keywords: functional regression; sparsely sampled functional data; high dimensional functional data; graphical models; features screening
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APA ·
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Manager
APA (6th Edition):
Qiao, X. (2015). Sparseness in functional data analysis. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/621510/rec/5981
Chicago Manual of Style (16th Edition):
Qiao, Xinghao. “Sparseness in functional data analysis.” 2015. Doctoral Dissertation, University of Southern California. Accessed March 04, 2021.
http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/621510/rec/5981.
MLA Handbook (7th Edition):
Qiao, Xinghao. “Sparseness in functional data analysis.” 2015. Web. 04 Mar 2021.
Vancouver:
Qiao X. Sparseness in functional data analysis. [Internet] [Doctoral dissertation]. University of Southern California; 2015. [cited 2021 Mar 04].
Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/621510/rec/5981.
Council of Science Editors:
Qiao X. Sparseness in functional data analysis. [Doctoral Dissertation]. University of Southern California; 2015. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/621510/rec/5981
University of Newcastle
10.
Braslavsky, Julio H.
Frequency domain analysis of sampled-data control systems.
Degree: 1996, University of Newcastle
URL: http://hdl.handle.net/1959.13/24783
► This thesis is aimed at analysis of sampled-data feedback systems. Our approach is in the frequency-domain, and stresses the study of sensitivity and complementary sensitivity…
(more)
▼ This thesis is aimed at analysis of sampled-data feedback systems. Our approach is in the frequency-domain, and stresses the study of sensitivity and complementary sensitivity operators. Frequency-domain methods have proven very successful in the analysis and design of linear time-invariant control systems, for which the importance and utility of sensitivity operators is well-recognized. The extension of these methods to sampled-data systems, however, is not straightforward, since they are inherently time-varying due to the intrinsic sample and hold operations. In this thesis we present a systematic frequency-domain framework to describe sampled-data systems considering full-time information. Using this framework, we develop a theory of design limitations for sampled-data systems. This theory allows us to quantify the essential constraints in design imposed by inherent open-loop characteristics of the analog plant. Our results show that: (i) sampled-data systems inherit the difficulty imposed upon analog feedback design by the plant's non-minimum phase zeros, unstable poles, and time-delays, independently of the type of hold used; (ii) sampled-data systems are subject to additional design limitations imposed by potential non-minimum phase zeros of the hold device; and (iii) sampled-data systems, unlike analog systems, are subject to limits upon the ability of high compensator gain to achieve disturbance rejection. As an application, we quantitatively analyze the sensitivity and robustness characteristics of digital control schemes that rely on the use of generalized sampled-data hold functions, whose frequency-response properties we describe in detail. In addition, we derive closed-form expressions to compute the L2-induced norms of the sampled-data sensitivity and complementary sensitivity operators. These expressions are important both in analysis and design, particularly when uncertainty in the model of the plant is considered. Our methods provide some interesting interpretations in terms of signal spaces, and admit straightforward implementation in a numerically reliable fashion.
PhD Doctorate
Advisors/Committee Members: University of Newcastle. Electrical Engineering and Computer Science.
Subjects/Keywords: Sampled-data systems; Frequency response; Performance limitations; Sensitivity analysis; Generalized sampled-data holds.
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APA (6th Edition):
Braslavsky, J. H. (1996). Frequency domain analysis of sampled-data control systems. (Thesis). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/24783
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):
Braslavsky, Julio H. “Frequency domain analysis of sampled-data control systems.” 1996. Thesis, University of Newcastle. Accessed March 04, 2021.
http://hdl.handle.net/1959.13/24783.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Braslavsky, Julio H. “Frequency domain analysis of sampled-data control systems.” 1996. Web. 04 Mar 2021.
Vancouver:
Braslavsky JH. Frequency domain analysis of sampled-data control systems. [Internet] [Thesis]. University of Newcastle; 1996. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1959.13/24783.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Braslavsky JH. Frequency domain analysis of sampled-data control systems. [Thesis]. University of Newcastle; 1996. Available from: http://hdl.handle.net/1959.13/24783
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
11.
Wu, Dian-Rong.
Robustness analysis of linear sampled-data systems with nonuniform samplings.
Degree: Master, Electrical Engineering, 2013, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0923113-110244
► The thesis is concerned with stability analysis of sampled-data systems with nonuniform samplings. The stability problem is trackled from a continuous-time point of view, via…
(more)
▼ The thesis is concerned with stability analysis of
sampled-
data systems with nonuniform samplings. The stability problem is trackled from a continuous-time point of view, via so-called ``input delay approach', where the ``aperiodic sampling operation' is modelled by a ``average-delay-difference' operator for which characterization based on integral quadratic
constrains (IQC) is identified. The system is then viewed as feedback interconnection of a stable linear time-varying sytem and the ``average-delay-difference' operator. We propose time-varying IQCs for the ``average-delay-difference' operator. It is shown that some IQCs we propose corresponds to certain Lyapunov functionals proposed in the literature. The equivalence between the stability criteria by the IQC theory and those by the Lyapunov theory is proven. With all the IQCs we proposed, a less conservative stability criterion is drived. Results of numerical tests are given to illustrate the effectiveness of the proposed approch.
Advisors/Committee Members: Li Lee (chair), Chung-Yao Kao (committee member), Chang-Hua Lien (chair).
Subjects/Keywords: Uncertain systems; Integral quadratic constraint (IQC); Stability analysis; Sampled-data systems; Aperiodic samplings
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APA (6th Edition):
Wu, D. (2013). Robustness analysis of linear sampled-data systems with nonuniform samplings. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0923113-110244
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):
Wu, Dian-Rong. “Robustness analysis of linear sampled-data systems with nonuniform samplings.” 2013. Thesis, NSYSU. Accessed March 04, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0923113-110244.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wu, Dian-Rong. “Robustness analysis of linear sampled-data systems with nonuniform samplings.” 2013. Web. 04 Mar 2021.
Vancouver:
Wu D. Robustness analysis of linear sampled-data systems with nonuniform samplings. [Internet] [Thesis]. NSYSU; 2013. [cited 2021 Mar 04].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0923113-110244.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wu D. Robustness analysis of linear sampled-data systems with nonuniform samplings. [Thesis]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0923113-110244
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Newcastle
12.
Cea Garrido, Mauricio Esteban.
Sampling and quantization in nonlinear filtering and control.
Degree: 2012, University of Newcastle
URL: http://hdl.handle.net/1959.13/935346
► Research Doctorate - Doctor of Philosophy
The thesis describes contributions made in two areas, namely, aspects of nonlinear filtering and control over communication channels. Specifically,…
(more)
▼ Research Doctorate - Doctor of Philosophy
The thesis describes contributions made in two areas, namely, aspects of nonlinear filtering and control over communication channels. Specifically, the thesis is concerned with addressing the impact of temporal and spatial quantization on the performance of estimation and control algorithms. Regarding nonlinear filtering, emphasis is placed on technical and theoretical issues regarding the impact of sampling and spatial quantization. New techniques of upsampling and downsampling are developed to address specific computational issues. Also, extensions to Lebesgue sampling are explored. In addition, a new class of nonlinear filtering algorithms, called Minimum Distortion Filters, is developed based on the use of Vector Quantization. The effectiveness of the new filtering algorithms are illustrated, by using it on a wide variety of problems including system identification, state estimation for chemical processes and radar tracking. Regarding control over communication channels, the focus is primarily on the practical problem of inner loop power control in broadband WCDMA. This control loop is characterized by the use of a one-bit-per-sample control law. This restriction severely limits the achievable performance. To address the problem, a novel adaptive quantizer is developed in the thesis. The scheme is shown to lead to significant performance improvements. The scheme has also been extended and applied to the problem of stabilizing an open loop unstable system over a bit rate constrained channel. Other control problems in WCDMA are also explored including the use of the "Happy Bit" to signal buffer sizes for the purposes of scheduling. This control loop is also subject to a one-bit-per-sample constraint. Typically, the one bit is used for a different purpose in current implementations. Here we develop an adaptive scheme based on the Happy Bit for communicating the buffer size.
Advisors/Committee Members: University of Newcastle. Faculty of Engineering & Built Environment, School of Electrical Engineering and Computer Science.
Subjects/Keywords: nonlinear filtering; quantization; sampled data; nonlinear MPC; WCDMA; networked control; constrained bit rate
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APA (6th Edition):
Cea Garrido, M. E. (2012). Sampling and quantization in nonlinear filtering and control. (Thesis). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/935346
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):
Cea Garrido, Mauricio Esteban. “Sampling and quantization in nonlinear filtering and control.” 2012. Thesis, University of Newcastle. Accessed March 04, 2021.
http://hdl.handle.net/1959.13/935346.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cea Garrido, Mauricio Esteban. “Sampling and quantization in nonlinear filtering and control.” 2012. Web. 04 Mar 2021.
Vancouver:
Cea Garrido ME. Sampling and quantization in nonlinear filtering and control. [Internet] [Thesis]. University of Newcastle; 2012. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1959.13/935346.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cea Garrido ME. Sampling and quantization in nonlinear filtering and control. [Thesis]. University of Newcastle; 2012. Available from: http://hdl.handle.net/1959.13/935346
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chapman University
13.
Anderson, Kyle.
Contributions to Variable Selection in Complexly Sampled Case-control Models, Epidemiology of 72-hour Emergency Department Readmission, and Out-of-site Migration Rate Estimation Using Pseudo-tagged Longitudinal Data.
Degree: PhD, Computational and Data Sciences, 2019, Chapman University
URL: https://digitalcommons.chapman.edu/cads_dissertations/7
► This work consists of three different projects. In the first project, I analyze complexly sampled survey data, representative of the US population, to determine…
(more)
▼ This work consists of three different projects.
In the first project, I analyze complexly
sampled survey
data, representative of the US population, to determine what lifestyle behaviors and notions held by participants are most significant with having had a cancer diagnosis. A logistic regression model was built using automatic variable selection with forward selection with backwards elimination. Our results show that sunscreen usage, level of agreeing with the statement "behaviors can affect high blood pressure", age, intent to eat more or less fruit, average daily hours spent watching tv or playing video games, and level of agreeing with the statement "I would rather not know my chances of getting cancer" were significant variables associated with a having had a cancer diagnosis.
In the second project, I developed a novel method for tracking untagged organisms over a 20-year period,
data collected at 6-month intervals. Our results showed that the staying rates, emigration/mortality rates, and immigration rates were approximately 50%. We also found that 44.1% of the limpets emigrate/die within their first 6-month time interval.
In the third project, I investigated the most significant predictors of a return to the Emergency Department within 72 hours, with a focus on adult patients with a respiratory condition. High return rates are a burden to both the Emergency Department and patients. We used a dataset extracted from a database containing billions of patient visits and implemented a nested mixed effects model to determine the most significant predictors. There were 20 risk factors found, including demographic variables, diagnostic conditions, and respiratory conditions.
Advisors/Committee Members: Cyril Rakovski, Lisa Sparks, William G. Wright, Louis Ehwerhemuepha.
Subjects/Keywords: Automatic Variable Selection; Stepwise; Complexely Sampled Survey Data; Statistics; Nested Mixed Effects Models; Survival
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APA (6th Edition):
Anderson, K. (2019). Contributions to Variable Selection in Complexly Sampled Case-control Models, Epidemiology of 72-hour Emergency Department Readmission, and Out-of-site Migration Rate Estimation Using Pseudo-tagged Longitudinal Data. (Doctoral Dissertation). Chapman University. Retrieved from https://digitalcommons.chapman.edu/cads_dissertations/7
Chicago Manual of Style (16th Edition):
Anderson, Kyle. “Contributions to Variable Selection in Complexly Sampled Case-control Models, Epidemiology of 72-hour Emergency Department Readmission, and Out-of-site Migration Rate Estimation Using Pseudo-tagged Longitudinal Data.” 2019. Doctoral Dissertation, Chapman University. Accessed March 04, 2021.
https://digitalcommons.chapman.edu/cads_dissertations/7.
MLA Handbook (7th Edition):
Anderson, Kyle. “Contributions to Variable Selection in Complexly Sampled Case-control Models, Epidemiology of 72-hour Emergency Department Readmission, and Out-of-site Migration Rate Estimation Using Pseudo-tagged Longitudinal Data.” 2019. Web. 04 Mar 2021.
Vancouver:
Anderson K. Contributions to Variable Selection in Complexly Sampled Case-control Models, Epidemiology of 72-hour Emergency Department Readmission, and Out-of-site Migration Rate Estimation Using Pseudo-tagged Longitudinal Data. [Internet] [Doctoral dissertation]. Chapman University; 2019. [cited 2021 Mar 04].
Available from: https://digitalcommons.chapman.edu/cads_dissertations/7.
Council of Science Editors:
Anderson K. Contributions to Variable Selection in Complexly Sampled Case-control Models, Epidemiology of 72-hour Emergency Department Readmission, and Out-of-site Migration Rate Estimation Using Pseudo-tagged Longitudinal Data. [Doctoral Dissertation]. Chapman University; 2019. Available from: https://digitalcommons.chapman.edu/cads_dissertations/7
University of Michigan
14.
Ortiz, David Santana.
Feedback properties and applications of sampled-data systems with periodic-digital components.
Degree: PhD, Systems science, 1998, University of Michigan
URL: http://hdl.handle.net/2027.42/131297
► We consider sampled-data systems composed of linear time invariant continuous processes and periodic discrete processes. We study three aspects of these systems. First, under the…
(more)
▼ We consider
sampled-
data systems composed of linear time invariant continuous processes and periodic discrete processes. We study three aspects of these systems. First, under the assumption of closed-loop stability, we study the frequency response of these systems. The frequency response of
sampled-
data systems with shift-invariant discrete parts has an infinite number of harmonics due to aliasing of the
sampled signals in the system. The periodic-digital components in the systems under consideration induce additional frequency components in the response. We study the fundamental component of the frequency response with respect to differential sensitivity to variations in system components and integral constraints due to open loop non-minimum phase zeros and unstable poles of the system. Second, we study stability robustness of
sampled-
data systems with periodic-digital components to multiplicative uncertainty in the continuous and discrete dynamics. In this case, we interpret the plant and controller to be periodic and discrete, and the continuous dynamics as representing transport and actuator dynamics. An example of mismatched fuel injectors in a four-cylinder engine illustrates the results. Third, we characterize the structure and properties of zeros for these systems and develop conditions upon the topology and structure of the system to guarantee tracking and disturbance rejection to complex exponential inputs.
Advisors/Committee Members: Freudenberg, James Scott (advisor).
Subjects/Keywords: Applications; Feedback; Periodic-digital Components; Properties; Sampled-data Systems
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APA (6th Edition):
Ortiz, D. S. (1998). Feedback properties and applications of sampled-data systems with periodic-digital components. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/131297
Chicago Manual of Style (16th Edition):
Ortiz, David Santana. “Feedback properties and applications of sampled-data systems with periodic-digital components.” 1998. Doctoral Dissertation, University of Michigan. Accessed March 04, 2021.
http://hdl.handle.net/2027.42/131297.
MLA Handbook (7th Edition):
Ortiz, David Santana. “Feedback properties and applications of sampled-data systems with periodic-digital components.” 1998. Web. 04 Mar 2021.
Vancouver:
Ortiz DS. Feedback properties and applications of sampled-data systems with periodic-digital components. [Internet] [Doctoral dissertation]. University of Michigan; 1998. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/2027.42/131297.
Council of Science Editors:
Ortiz DS. Feedback properties and applications of sampled-data systems with periodic-digital components. [Doctoral Dissertation]. University of Michigan; 1998. Available from: http://hdl.handle.net/2027.42/131297
McMaster University
15.
Baloch, Mahvash.
A Compositional Approach for Verifying Sampled-Data Supervisory Control.
Degree: MSc, 2012, McMaster University
URL: http://hdl.handle.net/11375/11959
► Sampled-data supervisory control deals with timed discrete event systems (TDES) where the supervisors are to be implemented as sampled-data controllers. A sampled-data controller views…
(more)
▼ Sampled-data supervisory control deals with timed discrete event systems (TDES) where the supervisors are to be implemented as sampled-data controllers. A sampled-data controller views the system as a series of inputs and outputs and is controlled by a periodic clock. It samples its inputs, changes state, and updates its outputs on each clock edge (the tick event). The sampled-data supervisory control framework provides a set of conditions that the TDES system must satisfy to ensure its correct behaviour in order to be implemented as sampled data controllers. A serious limitation for automatic verification of systems is the size of the system's synchronous product. To overcome this limitation, we propose the use of a compositional approach to the verification of sampled-data supervisory control. In this approach, first we recast the required conditions for sampled-data supervisory control in terms of other properties such as language inclusion, nonblocking or controllability, which already have existing compositional methods and algorithms. This makes the sampled-data properties suitable for compositional verification, considerably increasing the size of systems that can be handled using sampled-data supervisory control. We also develop and implement a set of algorithms for the compositional verification of these sampled-data properties. We provide an example of the SD Controlled Flexible Manufacturing System to test our algorithms.
Master of Science (MSc)
Advisors/Committee Members: Leduc, Ryan, Malik, Robi, Computing and Software.
Subjects/Keywords: Discrete Event Systems; Supervisory Control; Sampled Data Supervisory Control; Compositional Verification; Controls and Control Theory; Controls and Control Theory
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APA (6th Edition):
Baloch, M. (2012). A Compositional Approach for Verifying Sampled-Data Supervisory Control. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/11959
Chicago Manual of Style (16th Edition):
Baloch, Mahvash. “A Compositional Approach for Verifying Sampled-Data Supervisory Control.” 2012. Masters Thesis, McMaster University. Accessed March 04, 2021.
http://hdl.handle.net/11375/11959.
MLA Handbook (7th Edition):
Baloch, Mahvash. “A Compositional Approach for Verifying Sampled-Data Supervisory Control.” 2012. Web. 04 Mar 2021.
Vancouver:
Baloch M. A Compositional Approach for Verifying Sampled-Data Supervisory Control. [Internet] [Masters thesis]. McMaster University; 2012. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/11375/11959.
Council of Science Editors:
Baloch M. A Compositional Approach for Verifying Sampled-Data Supervisory Control. [Masters Thesis]. McMaster University; 2012. Available from: http://hdl.handle.net/11375/11959
University of Newcastle
16.
Yuz Eissmann, Juan Ignacio.
Sampled-data models for linear and nonlinear systems.
Degree: 2006, University of Newcastle
URL: http://hdl.handle.net/1959.13/24852
► Continuous-time systems are usually modelled by differential equations arising from physical laws. However, the use of these models in practice requires discretisation. In this thesis…
(more)
▼ Continuous-time systems are usually modelled by differential equations arising from physical laws. However, the use of these models in practice requires discretisation. In this thesis we consider sampled-data models for linear and nonlinear systems. We study some of the issues involved in the sampling process, such as the accuracy of the sampled-data models, the artifacts produced by the particular sampling scheme, and the relations to the underlying continuous-time system. We review, extend and present new results, making extensive use of the delta operator which allows a clearer connection between a sampled-data model and the underlying continuous-time system. In the first part of the thesis we consider sampled-data models for linear systems. In this case exact discrete-time representations can be obtained. These models depend, not only on the continuous-time system, but also on the artifacts involved in the sampling process, namely, the sample and hold devices. In particular, these devices play a key role in determining the sampling zeros of the discrete-time model. We consider robustness issues associated with the use of discrete-time models for continuous-time system identification from sampled data. We show that, by using restricted bandwidth frequency domain maximum likelihood estimation, the identification results are robust to (possible) under-modelling due to the sampling process. Sampled-data models provide a powerful tool also for continuous-time optimal control problems, where the presence of constraints can make the explicit solution impossible to find. We show how this solution can be arbitrarily approximated by an associated sampled-data problem using fast sampling rates. We also show that there is a natural convergence of the singular structure of the optimal control problem from discrete- to continuous-time, as the sampling period goes to zero. In Part II we consider sampled-data models for nonlinear systems. In this case we can only obtain approximate sampled-data models. These discrete-time models are simple and accurate in a well defined sense. For deterministic systems, an insightful observation is that the proposed model contains sampling zero dynamics. Moreover, these correspond to the same dynamics associated with the asymptotic sampling zeros in the linear case. The topics and results presented in the thesis are believed to give important insights into the use of sampled-data models to represent linear and nonlinear continuous-time systems.
PhD Doctorate
Advisors/Committee Members: University of Newcastle. School of Electrical Engineering and Computer Science.
Subjects/Keywords: sampled-data models; nonlinear systems; optimal control
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APA (6th Edition):
Yuz Eissmann, J. I. (2006). Sampled-data models for linear and nonlinear systems. (Thesis). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/24852
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):
Yuz Eissmann, Juan Ignacio. “Sampled-data models for linear and nonlinear systems.” 2006. Thesis, University of Newcastle. Accessed March 04, 2021.
http://hdl.handle.net/1959.13/24852.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yuz Eissmann, Juan Ignacio. “Sampled-data models for linear and nonlinear systems.” 2006. Web. 04 Mar 2021.
Vancouver:
Yuz Eissmann JI. Sampled-data models for linear and nonlinear systems. [Internet] [Thesis]. University of Newcastle; 2006. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1959.13/24852.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yuz Eissmann JI. Sampled-data models for linear and nonlinear systems. [Thesis]. University of Newcastle; 2006. Available from: http://hdl.handle.net/1959.13/24852
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
17.
Mattioni, Mattia.
Stabilisation des systèmes échantillonnés en cascade et avec retards : Stabilisation of cascade and time-delay sampled-data systems.
Degree: Docteur es, Automatique, 2018, Université Paris-Saclay (ComUE); Università degli studi La Sapienza (Rome)
URL: http://www.theses.fr/2018SACLS118
► Les méthodologies de l'automatique ont joué au cours des dernières décennies un ´r^ole essentiel au sein de nombreux secteurs technologiques avancées. Cependant, de nombreuse questions…
(more)
▼ Les méthodologies de l'automatique ont joué au cours des dernières décennies un ´r^ole essentiel au sein de nombreux secteurs technologiques avancées. Cependant, de nombreuse questions restent ouvertes. Parmi celles-ci, celles concernant la stabilité et la stabilisation de systèmes non linéaires sont d'intérêt primordial. Afin de stabilizer un système (physique ou non), il est nécessaire de capter et interpreter en temps réel les informations hétérogènes caractérisant son fonctionnement afin intervenir efficacement. Actuellement ces informations ne sont pas captées en temps continu, mais de façon synchrone ou asynchrone et ceci est valable aussi pour les actuateurs. De façon très naturelle, on définit donc un système hybride, caractérisé par des dynamiques à la fois discrètes et continues. Dans ce contexte, cette thèse est orientée au développement de nouvelles méthodologies pour la stabilisation de systèmes échantillonnés non linéaires en se focalisant sur la stabilisation de formes cascades qui se retrouvent dans de nombreuse situations concretes. Pour cela, on étudiera l'effet de l'échantillonnage sur les propriétés de la dynamique continue et l'on proposera des méthodologies pour la conception de lois de commande qui ne requièrent pas d'assumptions supplémentaires au cas continu.Enfin, on étudiera l'effet de l'échantillonnage sur des systèmes présentant de retards sur les entrées. On développera des lois de commande stabilisantes exploitant la structure en cascade induite par l'échantillonnage. Des exemples académiques illustreront les calcules des solutions et leur performances tout au long du manuscript.
Over the last decades the methodologies of dynamical systems and control theory have been playing an increasingly relevant role in a lot of situations of practical interest. Though, a lot of theoretical problem still remain unsolved. Among all, the ones concerning stability and stabilization are of paramount importance. In order to stabilize a physical (or not) system, it is necessary to acquire and interpret heterogeneous information on its behavior in order to correctly intervene on it. In general, those information are not available through a continuous flow but are provided in a synchronous or asynchronous way. This issue has to be unavoidably taken into account for the design of the control action. In a very natural way, all those heterogeneities define an hybrid system characterized by both continuous and discrete dynamics. This thesis is contextualized in this framework and aimed at proposing new methodologies for the stabilization of sampled-data nonlinear systems with focus toward the stabilization of cascade dynamics. In doing so, we shall propose a small number of tools for constructing sampled-data feedback laws stabilizing the origin of sampled-data nonlinear systems admitting cascade interconnection representations. To this end, we shall investigate on the effect of sampling on the properties of the continuous-time system while enhancing design procedures requiring no extra assumptions over the…
Advisors/Committee Members: Normand-Cyrot, Dorothée (thesis director), Monaco, Salvatore (thesis director), Richard, Jean-Pierre (thesis director).
Subjects/Keywords: Systèmes non linéaires; Systèmes à données échantillonnées; Systèmes à retards; Nonlinear systems; Sampled-Data systems; Time-Delay systems
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APA (6th Edition):
Mattioni, M. (2018). Stabilisation des systèmes échantillonnés en cascade et avec retards : Stabilisation of cascade and time-delay sampled-data systems. (Doctoral Dissertation). Université Paris-Saclay (ComUE); Università degli studi La Sapienza (Rome). Retrieved from http://www.theses.fr/2018SACLS118
Chicago Manual of Style (16th Edition):
Mattioni, Mattia. “Stabilisation des systèmes échantillonnés en cascade et avec retards : Stabilisation of cascade and time-delay sampled-data systems.” 2018. Doctoral Dissertation, Université Paris-Saclay (ComUE); Università degli studi La Sapienza (Rome). Accessed March 04, 2021.
http://www.theses.fr/2018SACLS118.
MLA Handbook (7th Edition):
Mattioni, Mattia. “Stabilisation des systèmes échantillonnés en cascade et avec retards : Stabilisation of cascade and time-delay sampled-data systems.” 2018. Web. 04 Mar 2021.
Vancouver:
Mattioni M. Stabilisation des systèmes échantillonnés en cascade et avec retards : Stabilisation of cascade and time-delay sampled-data systems. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); Università degli studi La Sapienza (Rome); 2018. [cited 2021 Mar 04].
Available from: http://www.theses.fr/2018SACLS118.
Council of Science Editors:
Mattioni M. Stabilisation des systèmes échantillonnés en cascade et avec retards : Stabilisation of cascade and time-delay sampled-data systems. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); Università degli studi La Sapienza (Rome); 2018. Available from: http://www.theses.fr/2018SACLS118
California State University – Northridge
18.
Skei, Edward Michael.
Sampled data models of voltage multipliers.
Degree: MS, Department of Engineering, 1978, California State University – Northridge
URL: http://hdl.handle.net/10211.3/124724
► A method for developing sampled data models for voltage multipliers using Z transform methods is developed. The model is a Z transform transfer function relating…
(more)
▼ A method for developing
sampled data models for voltage multipliers using Z transform methods is developed. The model is a Z transform transfer function relating the output voltage of the multiplier to input voltage and the load current. The diodes of the multiplier are treated as synchronous switches and capacitor voltages are chosen as state variables. A system of difference equations is written in standard state variable form by considering the operation of the multiplier over one state transition. The solution is found by taking the Z transform of the difference equations in the same manner that LaPlace transforms are used in the solution of differential equations. The resulting set of algebraic equations can be solved using matrix techniques to find the desired Z transform transfer functions. The transfer function of the series multiplier is used to find the capacitor ratio for optimum steady state performance with minimum total capacitance. The pole and zero locations of the transfer functions for a number of series multipliers with unity and optimum capacitor ratios are listed. The usage of the model in closed loop systems in conjunction with continuous elements for compensation is discussed.
Advisors/Committee Members: Hashimoto, Ichiro (advisor), Landis, Raymond (committee member).
Subjects/Keywords: Sampled-data systems; Dissertations, Academic – CSUN – Engineering
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APA (6th Edition):
Skei, E. M. (1978). Sampled data models of voltage multipliers. (Masters Thesis). California State University – Northridge. Retrieved from http://hdl.handle.net/10211.3/124724
Chicago Manual of Style (16th Edition):
Skei, Edward Michael. “Sampled data models of voltage multipliers.” 1978. Masters Thesis, California State University – Northridge. Accessed March 04, 2021.
http://hdl.handle.net/10211.3/124724.
MLA Handbook (7th Edition):
Skei, Edward Michael. “Sampled data models of voltage multipliers.” 1978. Web. 04 Mar 2021.
Vancouver:
Skei EM. Sampled data models of voltage multipliers. [Internet] [Masters thesis]. California State University – Northridge; 1978. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10211.3/124724.
Council of Science Editors:
Skei EM. Sampled data models of voltage multipliers. [Masters Thesis]. California State University – Northridge; 1978. Available from: http://hdl.handle.net/10211.3/124724
Ohio University
19.
Hammond, Thomas T.
Sampled-data frequency response system identification for
large space structures.
Degree: MS, Electrical Engineering & Computer Science
(Engineering and Technology), 1988, Ohio University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1182787762
Sampled-data frequency response system
identification for large space structures
Advisors/Committee Members: Mitchell, Jerrel (Advisor).Subjects/Keywords: Sampled-Data Frequency; Response System Identification; Large Space Structures
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Hammond, T. T. (1988). Sampled-data frequency response system identification for
large space structures. (Masters Thesis). Ohio University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1182787762
Chicago Manual of Style (16th Edition):
Hammond, Thomas T. “Sampled-data frequency response system identification for
large space structures.” 1988. Masters Thesis, Ohio University. Accessed March 04, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1182787762.
MLA Handbook (7th Edition):
Hammond, Thomas T. “Sampled-data frequency response system identification for
large space structures.” 1988. Web. 04 Mar 2021.
Vancouver:
Hammond TT. Sampled-data frequency response system identification for
large space structures. [Internet] [Masters thesis]. Ohio University; 1988. [cited 2021 Mar 04].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1182787762.
Council of Science Editors:
Hammond TT. Sampled-data frequency response system identification for
large space structures. [Masters Thesis]. Ohio University; 1988. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1182787762
York University
20.
Liu, Lei.
Cooperative Control of Nonlinear Multi-Agent Systems.
Degree: PhD, Earth & Space Science, 2016, York University
URL: http://hdl.handle.net/10315/32733
► Multi-agent systems have attracted great interest due to their potential applications in a variety of areas. In this dissertation, a nonlinear consensus algorithm is developed…
(more)
▼ Multi-agent systems have attracted great interest due to their potential applications in a variety of areas. In this dissertation, a nonlinear consensus algorithm is developed for networked Euler-Lagrange multi-agent systems. The proposed consensus algorithm guarantees that all agents can reach a common state in the workspace. Meanwhile, the external disturbances and structural uncertainties are fundamentally considered in the controller design. The robustness of the proposed consensus algorithm is then demonstrated in the stability analysis. Furthermore, experiments are conducted to validate the effectiveness of the proposed consensus algorithm.
Next, a distributed leader-follower formation tracking controller is developed for networked nonlinear multi-agent systems. The dynamics of each agent are modeled by Euler-Lagrange equations, and all agents are guaranteed to track a desired time-varying trajectory in the presence of noise. The fault diagnosis strategy of the nonlinear multi-agent system is also investigated with the help of differential geometry tools. The effectiveness of the proposed controller is verified through simulations.
To further extend the application area of the multi-agent technique, a distributed robust controller is then developed for networked Lipschitz nonlinear multi-agent systems. With the appearance of system uncertainties and external disturbances, a
sampled-
data feedback control protocol is carried out through the Lyapunov functional approach. The effectiveness of the proposed controller is verified by numerical simulations. Other than the robustness and
sampled-
data information exchange, this dissertation is also concerned with the event-triggered consensus problem for the Lipschitz nonlinear multi-agent systems. Furthermore, the sufficient condition for the stochastic stabilization of the networked control system is proposed based on the Lyapunov functional method. Finally, simulation is conducted to demonstrate the effectiveness of the proposed control algorithm.
In this dissertation, the cooperative control of networked Euler-Lagrange systems and networked Lipschitz systems is investigated essentially with the assistance of nonlinear control theory and diverse controller design techniques. The main objective of this work is to propose realizable control algorithms for nonlinear multi-agent systems.
Advisors/Committee Members: Shan, Jinjun (advisor).
Subjects/Keywords: Mathematics; Control theory; Consensus; Cooperative control; Robust control; Nonlinear control; Synchronization; Multi-agent systems; Sampled-data control; Fault diagnosis
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MLA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Liu, L. (2016). Cooperative Control of Nonlinear Multi-Agent Systems. (Doctoral Dissertation). York University. Retrieved from http://hdl.handle.net/10315/32733
Chicago Manual of Style (16th Edition):
Liu, Lei. “Cooperative Control of Nonlinear Multi-Agent Systems.” 2016. Doctoral Dissertation, York University. Accessed March 04, 2021.
http://hdl.handle.net/10315/32733.
MLA Handbook (7th Edition):
Liu, Lei. “Cooperative Control of Nonlinear Multi-Agent Systems.” 2016. Web. 04 Mar 2021.
Vancouver:
Liu L. Cooperative Control of Nonlinear Multi-Agent Systems. [Internet] [Doctoral dissertation]. York University; 2016. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10315/32733.
Council of Science Editors:
Liu L. Cooperative Control of Nonlinear Multi-Agent Systems. [Doctoral Dissertation]. York University; 2016. Available from: http://hdl.handle.net/10315/32733
Universidade do Rio Grande do Norte
21.
Medeiros, Luiz Paulo de Souza.
Uma ferramenta para Análise Multiresolução
de dados não regularmente amostrados
.
Degree: 2012, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/15420
► Digital signal processing (DSP) aims to extract specific information from digital signals. Digital signals are, by definition, physical quantities represented by a sequence of discrete…
(more)
▼ Digital signal processing (DSP) aims to extract specific information from digital signals.
Digital signals are, by definition, physical quantities represented by a sequence of
discrete values and from these sequences it is possible to extract and analyze the desired
information. The unevenly
sampled data can not be properly analyzed using standard
techniques of digital signal processing. This work aimed to adapt a technique of DSP,
the multiresolution analysis, to analyze unevenly smapled
data, to aid the studies in the
CoRoT laboratory at UFRN. The process is based on re-indexing the wavelet transform to
handle unevenly
sampled data properly. The was efective presenting satisfactory results
Advisors/Committee Members: Guerreiro, Ana Maria Guimarães (advisor), CPF:01207607703 (advisor), http://lattes.cnpq.br/8556144121380013 (advisor).
Subjects/Keywords: Wavelet;
Lomb-Scargle;
Dados não regularmente amostrados;
Análise espectral;
Análise multiresolução;
CoRoT;
Wavelet;
Lomb-Scargle;
Unevenly sampled data;
Spectral analysis;
Multiresolution analysis;
CoRoT
Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Medeiros, L. P. d. S. (2012). Uma ferramenta para Análise Multiresolução
de dados não regularmente amostrados
. (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15420
Chicago Manual of Style (16th Edition):
Medeiros, Luiz Paulo de Souza. “Uma ferramenta para Análise Multiresolução
de dados não regularmente amostrados
.” 2012. Masters Thesis, Universidade do Rio Grande do Norte. Accessed March 04, 2021.
http://repositorio.ufrn.br/handle/123456789/15420.
MLA Handbook (7th Edition):
Medeiros, Luiz Paulo de Souza. “Uma ferramenta para Análise Multiresolução
de dados não regularmente amostrados
.” 2012. Web. 04 Mar 2021.
Vancouver:
Medeiros LPdS. Uma ferramenta para Análise Multiresolução
de dados não regularmente amostrados
. [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2012. [cited 2021 Mar 04].
Available from: http://repositorio.ufrn.br/handle/123456789/15420.
Council of Science Editors:
Medeiros LPdS. Uma ferramenta para Análise Multiresolução
de dados não regularmente amostrados
. [Masters Thesis]. Universidade do Rio Grande do Norte; 2012. Available from: http://repositorio.ufrn.br/handle/123456789/15420
University of Michigan
22.
Osburn, Scot Lawrence.
Robust analysis of sampled data controllers.
Degree: PhD, Electrical engineering, 2000, University of Michigan
URL: http://hdl.handle.net/2027.42/132434
► Uncertainties in a plant's dynamics and in its input and output channels make it difficult for a control system to obtain good performance characteristics and…
(more)
▼ Uncertainties in a plant's dynamics and in its input and output channels make it difficult for a control system to obtain good performance characteristics and stability of the closed-loop system. These difficulties arise both in continuous-time and discrete-time, but are exemplified in the
sampled-
data control problem. In the present work, the effects of uncertainties on the robust stability and performance of continuous-time, discrete-time and
sampled-
data systems is quantified using an H
2 performance measure. For continuous-time and discrete-time systems, robust stability and performance bounds are formulated in terms of guaranteed cost inequalities. New guaranteed cost bounds are derived for plants with real structured uncertainty and are given in their equivalent LMI form. For continuous-time systems, a shifted linear bound and a shifted inverse bound are obtained. LMI forms are given for these bounds and for the shifted bounded real bound and shifted Popov bound. For discrete-time systems, a linear bound, an inverse bound, a shifted bounded-real bound, and a shifted Popov bound are obtained. LMI forms are given for these bounds. For both systems, comparisons are made between the shifted bounds, their unshifted counterparts and bounds based on standard LMI techniques. Finally, the
sampled-
data robust stability and performance problem is considered. The closed-loop performance of a
sampled-
data control system under plant uncertainty is investigated by utilizing exact discretization techniques. In particular, for an H
2 performance measure, exact expressions for the closed-loop, state, cross-weighting, and control costs are obtained for a given sample interval h. LMI techniques are used to bound the worst-case performance given input and output uncertainties, and additional consideration is given to the case in which controllability is lost due to sampling. After applying discrete-time LQG synthesis to the
sampled-
data system, the achievable performance is evaluated for fast sampling h → 0 and for slow sampling h → infinity.
Advisors/Committee Members: Bernstein, Dennis S. (advisor).
Subjects/Keywords: Analysis; Controllers; Guaranteed Cost Bounds; Linear Matrix Inequalities; Robust Stability; Sampled Data
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Osburn, S. L. (2000). Robust analysis of sampled data controllers. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/132434
Chicago Manual of Style (16th Edition):
Osburn, Scot Lawrence. “Robust analysis of sampled data controllers.” 2000. Doctoral Dissertation, University of Michigan. Accessed March 04, 2021.
http://hdl.handle.net/2027.42/132434.
MLA Handbook (7th Edition):
Osburn, Scot Lawrence. “Robust analysis of sampled data controllers.” 2000. Web. 04 Mar 2021.
Vancouver:
Osburn SL. Robust analysis of sampled data controllers. [Internet] [Doctoral dissertation]. University of Michigan; 2000. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/2027.42/132434.
Council of Science Editors:
Osburn SL. Robust analysis of sampled data controllers. [Doctoral Dissertation]. University of Michigan; 2000. Available from: http://hdl.handle.net/2027.42/132434
Universidade do Rio Grande do Norte
23.
Medeiros, Luiz Paulo de Souza.
Uma ferramenta para Análise Multiresolução
de dados não regularmente amostrados
.
Degree: 2012, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/15420
► Digital signal processing (DSP) aims to extract specific information from digital signals. Digital signals are, by definition, physical quantities represented by a sequence of discrete…
(more)
▼ Digital signal processing (DSP) aims to extract specific information from digital signals.
Digital signals are, by definition, physical quantities represented by a sequence of
discrete values and from these sequences it is possible to extract and analyze the desired
information. The unevenly
sampled data can not be properly analyzed using standard
techniques of digital signal processing. This work aimed to adapt a technique of DSP,
the multiresolution analysis, to analyze unevenly smapled
data, to aid the studies in the
CoRoT laboratory at UFRN. The process is based on re-indexing the wavelet transform to
handle unevenly
sampled data properly. The was efective presenting satisfactory results
Advisors/Committee Members: Guerreiro, Ana Maria Guimarães (advisor), CPF:01207607703 (advisor), http://lattes.cnpq.br/8556144121380013 (advisor).
Subjects/Keywords: Wavelet;
Lomb-Scargle;
Dados não regularmente amostrados;
Análise espectral;
Análise multiresolução;
CoRoT;
Wavelet;
Lomb-Scargle;
Unevenly sampled data;
Spectral analysis;
Multiresolution analysis;
CoRoT
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Medeiros, L. P. d. S. (2012). Uma ferramenta para Análise Multiresolução
de dados não regularmente amostrados
. (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15420
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):
Medeiros, Luiz Paulo de Souza. “Uma ferramenta para Análise Multiresolução
de dados não regularmente amostrados
.” 2012. Thesis, Universidade do Rio Grande do Norte. Accessed March 04, 2021.
http://repositorio.ufrn.br/handle/123456789/15420.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Medeiros, Luiz Paulo de Souza. “Uma ferramenta para Análise Multiresolução
de dados não regularmente amostrados
.” 2012. Web. 04 Mar 2021.
Vancouver:
Medeiros LPdS. Uma ferramenta para Análise Multiresolução
de dados não regularmente amostrados
. [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2012. [cited 2021 Mar 04].
Available from: http://repositorio.ufrn.br/handle/123456789/15420.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Medeiros LPdS. Uma ferramenta para Análise Multiresolução
de dados não regularmente amostrados
. [Thesis]. Universidade do Rio Grande do Norte; 2012. Available from: http://repositorio.ufrn.br/handle/123456789/15420
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade do Rio Grande do Sul
24.
Palmeira, Alessandra Helena Kimura.
Estabilidade de sistemas amostrados com atuadores saturantes em magnitude e taxa de variação.
Degree: 2015, Universidade do Rio Grande do Sul
URL: http://hdl.handle.net/10183/127742
► Neste trabalho, aborda-se o problema de estabilidade de sistemas com dados amostrados periodicamente, na presença de atuadores saturantes em posição e em taxa de variação.…
(more)
▼ Neste trabalho, aborda-se o problema de estabilidade de sistemas com dados amostrados periodicamente, na presença de atuadores saturantes em posição e em taxa de variação. Os atuadores são modelados como sistemas de primeira ordem com saturação de entrada (saturação de magnitude) e do estado (saturação de taxa de variação). No modelo, considera-se que o sinal de controle é mantido constante entre dois instantes de amostragem consecutivos, enquanto as dinâmicas da planta linear e do atuador saturante são em tempo contínuo, i.e., não é feita discretização do sistema. O efeito da amostragem aperiódica é considerado através de um looped -funcional, derivado do funcional de Lyapunov-Krasovskii. O método desenvolvido relaciona uma função quadrática de Lyapunov e o funcional, considerando a amostragem assíncrona e o atuador saturante. Assim, se a derivada temporal do funcional ao longo das trajetórias do sistema for definida negativa, verifica-se que a função de Lyapunov é estritamente decrescente nos instantes de amostragem. Os efeitos das saturações são considerados por meio do uso da condição de setor generalizada. A partir do looped-funcional, da função de Lyapunov e das relações de setor generalizadas, são formuladas condições que permitem caracterizar a estabilidade e projetar ganhos estabilizantes da origem do sistema amostrado, em contexto local e global, através de algoritmos baseados na solução de LMIs. São propostas condições para maximização da estimativa da região de atração da origem ou, dado um conjunto de condições iniciais, para maximização do limite superior do intervalo de amostragem. As condições estabelecidas são válidas para o sistema com acesso a todos os estados, como também, no caso dos estados do atuador não estarem disponíveis `a medição.
This work addresses the problems of stability and stabilization of sampled-data systems taking into account aperiodic sampling and magnitude and rate saturating actuactors. The actuators are represented by a first-order system subject to input (magnitude saturation) and state (rate) saturation. In the considered model, the control signal is assumed to be constant between two successive sampling instants, while the dynamics of the linear plant and the saturating actuator are in continuous-time, i.e., no discretization is performed. The aperiodic sampling is taken into account from the method based on the input delay approach via looped-functional, derived from a time-dependent Lyapunov-Krasovskii functional. The developed method is based on a particular functional, that is related to a Lyapunov function. It is shown that if the time derivative of the looped- functional along the trajectories of the continuous-time system is strictly negative, then the Lyapunov function is strictly decreasing at sampling instants. The actuator saturations are taken into account from the use of a generalized sector condition. From the looped-functional, the Lyapunov function and the generalized sector conditions, the developed results lead to conditions that can be solved as LMI…
Advisors/Committee Members: Silva Junior, Joao Manoel Gomes da.
Subjects/Keywords: Atuador elétrico; Sampled-data systems; Sistemas de controle; Stability; Sistemas lineares; Looped-functional; Lyapunov- Krasovskii functional; Matematica computacional; Magnitude/position saturation; Rate saturation; Linear matrix inequality (LMI)
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APA ·
Chicago ·
MLA ·
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CSE |
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Manager
APA (6th Edition):
Palmeira, A. H. K. (2015). Estabilidade de sistemas amostrados com atuadores saturantes em magnitude e taxa de variação. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/127742
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):
Palmeira, Alessandra Helena Kimura. “Estabilidade de sistemas amostrados com atuadores saturantes em magnitude e taxa de variação.” 2015. Thesis, Universidade do Rio Grande do Sul. Accessed March 04, 2021.
http://hdl.handle.net/10183/127742.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Palmeira, Alessandra Helena Kimura. “Estabilidade de sistemas amostrados com atuadores saturantes em magnitude e taxa de variação.” 2015. Web. 04 Mar 2021.
Vancouver:
Palmeira AHK. Estabilidade de sistemas amostrados com atuadores saturantes em magnitude e taxa de variação. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2015. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10183/127742.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Palmeira AHK. Estabilidade de sistemas amostrados com atuadores saturantes em magnitude e taxa de variação. [Thesis]. Universidade do Rio Grande do Sul; 2015. Available from: http://hdl.handle.net/10183/127742
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
25.
Isfoula, Fayrouz.
Une approche du suivi de consensus pour les systèmes multi-agents : An appraoch of practical consensus tracking of multi agent systems.
Degree: Docteur es, Automatique, 2019, Poitiers
URL: http://www.theses.fr/2019POIT2303
► Un système multi-agents est composé d’un ensemble d’agents interagissant entre eux et avec leur environnement, un agent étant vu comme un système dynamique autonome. La…
(more)
▼ Un système multi-agents est composé d’un ensemble d’agents interagissant entre eux et avec leur environnement, un agent étant vu comme un système dynamique autonome. La force des SMA repose sur la capacité des agents à coopérer entre eux pour atteindre un objectif qu’un agent seul ne pourrait atteindre. Chaque agent partage ses informations avec ses voisins, ce qui permet à l’ensemble des agents de s’accorder sur un objectif commun sans qu’il y ait pour autant une centralisation de l’information et de l’objectif. En ce sens, un système multi-agents peut être vu comme un réseau dans lequel l’information est distribuée. L’intérêt croissant pour le contrôle distribué et la coordination des réseaux constitués d’agents autonomes est motivé par l’absence de centralisation de l’information et la possibilité d’avoir une topologie du réseau variable. Les algorithmes de contrôle déployés sur ces réseaux sont de nature distribuée puisqu’ils s’appuient sur des informations locales, et sont robustes vis-à-vis des variations de topologie et de taille du réseau. Le problème le plus étudié dans le cadre de ces systèmes multi-agents est celui du consensus, qui peut être résumé ainsi : étant donné des conditions initiales pour chaque agent, quelles sont les conditions pour que les agents s’accordent asymptotiquement sur une valeur commune en n’échangeant que des informations entre agents voisins. Cette thèse traite du développement de commandes permettant d’atteindre ce consensus pour des topologies fixes et variables, en présence ou non d’un leader (suivi de consensus), et sur la qualité des informations transitant dans le réseau. En suivi de consensus, la notion de leader perceptif est développée et une commande est proposée pour une topologie fixe et variable.
An agent is an autonomous dynamics system that can coordinate with the environment as well as with other agents. A group of these autonomous agents working in coordination is called a Multi-agent system (MAS). A MAS has several advantages over single agent operation. The main objective of MAS is to achieve a complex goal which is hard to achieve by a single agent. In MAS, each agent shares its information (states) to the neighbors only to complete the task hence no centralized monitoring systems is required. We can define a multi-agent system as a network in which information is distributed. The interest of researchers in the study of distributed control and distributed coordination of autonomous agent networks is motivated by the fact that it has the ability to cope with the problems associated with centralized communication network and also allow the switching network topologies.The algorithms for distributed networks only use local information, and are robust to variations of network topology and can accommodate network with large size.One of the most studied problems in the field of MAS is the consensus, which can be defined as: for any initial conditions for all agent, what are the conditions that should hold in order that the agents agree on a common value…
Advisors/Committee Members: Coirault, Patrick (thesis director), Moulay, Emmanuel (thesis director), Bernuau, Emmanuel (thesis director).
Subjects/Keywords: Système multi-Agents; Suivi par consensus; Leader perceptif; Commande échantillonnée; Multi-Agent systems; Consensus tracking; Perceptive leader; Sampled data control; 629.832; 629.836; 629.892
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APA (6th Edition):
Isfoula, F. (2019). Une approche du suivi de consensus pour les systèmes multi-agents : An appraoch of practical consensus tracking of multi agent systems. (Doctoral Dissertation). Poitiers. Retrieved from http://www.theses.fr/2019POIT2303
Chicago Manual of Style (16th Edition):
Isfoula, Fayrouz. “Une approche du suivi de consensus pour les systèmes multi-agents : An appraoch of practical consensus tracking of multi agent systems.” 2019. Doctoral Dissertation, Poitiers. Accessed March 04, 2021.
http://www.theses.fr/2019POIT2303.
MLA Handbook (7th Edition):
Isfoula, Fayrouz. “Une approche du suivi de consensus pour les systèmes multi-agents : An appraoch of practical consensus tracking of multi agent systems.” 2019. Web. 04 Mar 2021.
Vancouver:
Isfoula F. Une approche du suivi de consensus pour les systèmes multi-agents : An appraoch of practical consensus tracking of multi agent systems. [Internet] [Doctoral dissertation]. Poitiers; 2019. [cited 2021 Mar 04].
Available from: http://www.theses.fr/2019POIT2303.
Council of Science Editors:
Isfoula F. Une approche du suivi de consensus pour les systèmes multi-agents : An appraoch of practical consensus tracking of multi agent systems. [Doctoral Dissertation]. Poitiers; 2019. Available from: http://www.theses.fr/2019POIT2303
26.
Theodosis - Palimeris, Dionysios.
Προβλήματα σχεδίασης για μη γραμμικά συστήματα.
Degree: 2017, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)
URL: http://hdl.handle.net/10442/hedi/40384
► Ιn this Dissertation the following problems are addressed: (i) the Observer Design Problem for nonlinear time-varying systems; and (ii) the Problem of Stabilizing an autonomous…
(more)
▼ Ιn this Dissertation the following problems are addressed: (i) the Observer Design Problem for nonlinear time-varying systems; and (ii) the Problem of Stabilizing an autonomous nonlinear system by means of sampled-data feedback. Firstly, sufficient conditions are established for the solvability of the Observer Design Problem for a wide class of triangular nonlinear control systems. The state estimation is exhibited by means of a Luenberger-type observer whose dynamics are in general time-varying and noncausal. The proof of the main results is based on a Lyapunov-like forwarding procedure which extends relative methodologies employed in the literature for the solvability of the same problem. Then, it is proved that, under weaker hypotheses, the observer design problem for triangular systems is solvable by means of a switching sequence of delayed observers. In the second part of this dissertation, a Lyapunov characterization is established for the possibility of semi-global asymptotic stabilization of general nonlinear autonomous systems by means of a time-varying sampled-data feedback. This result is then exploited in order to derive a Lie algebraic sufficient condition for sampled-data feedback semi-global stabilization of affine in the control nonlinear systems with non-zero drift term. The corresponding result constitutes an extension of the well-known Artstein-Sontag Theorem on stabilization by means of an almost smooth feedback.
Στην παρούσα διατριβή μελετώνται τα εξής δύο προβλήματα: (i) Το Πρόβλημα Σχεδίασης Παρατηρητών για μη γραμμικά χρονικώς μεταβαλλόμενα συστήματα, και (ii) το Πρόβλημα Σταθεροποίησης αυτόνομων μη γραμμικών συστημάτων μέσω ανάδρασης με δειγματοληψία.Αρχικά, εδραιώνονται ικανές συνθήκες για την επιλυσιμότητα του Προβλήματος Σχεδίασης Παρατηρητή για μια μεγάλη κλάση μη γραμμικών τριγωνικών συστημάτων ελέγχου. Η κατάσταση του συστήματος εκτιμάται μέσω ενός Luenberger τύπου παρατηρητή του οποίου τα δυναμικά είναι εν γένει χρονικώς μεταβαλλόμενα και μη αιτιατά. Η απόδειξη των αντίστοιχων αποτελεσμάτων στηρίζεται σε μια Lyapunov τύπου επαγωγική διαδικασία που επεκτείνει παρόμοιες μεθοδολογίες από τη διεθνή βιβλιογραφία για την επιλυσιμότητα του ίδιου προβλήματος. Στη συνέχεια, αποδεικνύεται ότι, υπό ασθενέστερες συνθήκες, το Πρόβλημα Σχεδίασης Παρατηρητή για τριγωνικά συστήματα είναι επιλύσιμο μέσω μιας διακοπτόμενης ακολουθίας παρατηρητών με χρονική υστέρηση. Στο δεύτερο μέρος της διατριβής, εδραιώνονται Lyapunov χαρακτηρισμοί για τη δυνατότητα ημι-ολικής σταθεροποίησης μη γραμμικών αυτόνομων συστημάτων μέσω χρονικά μεταβαλλόμενης ανάδρασης με δειγματοληψία. Στη συνέχεια, αυτός ο χαρακτηρισμός χρησιμοποιείται προκειμένου να εξαχθούν ικανές Lie αλγεβρικές συνθήκες για τη δυνατότητα σταθεροποίησης μη γραμμικών συστημάτων, γραμμικών ως προς τον έλεγχο, μέσω ανάδρασης με δειγματοληψία. Το αντίστοιχο αποτέλεσμα αποτελεί επέκταση του γνωστού Θεωρήματος Artstein-Sontag για σταθεροποίηση μέσω σχεδόν λείας ανάδρασης.
Subjects/Keywords: Παρατηρητές; Μη γραμμικά συστήματα; Σταθεροποίηση; Ανάδραση με δειγματοληψία; Τριγωνικά συστήματα ελέγχου; Διακοπτόμενα δυναμικά; Observers; Nonlinear systems; Stabilization; Sampled-data feedback; Triangular control systems; Switching dynamics
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APA (6th Edition):
Theodosis - Palimeris, D. (2017). Προβλήματα σχεδίασης για μη γραμμικά συστήματα. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/40384
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):
Theodosis - Palimeris, Dionysios. “Προβλήματα σχεδίασης για μη γραμμικά συστήματα.” 2017. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed March 04, 2021.
http://hdl.handle.net/10442/hedi/40384.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Theodosis - Palimeris, Dionysios. “Προβλήματα σχεδίασης για μη γραμμικά συστήματα.” 2017. Web. 04 Mar 2021.
Vancouver:
Theodosis - Palimeris D. Προβλήματα σχεδίασης για μη γραμμικά συστήματα. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2017. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10442/hedi/40384.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Theodosis - Palimeris D. Προβλήματα σχεδίασης για μη γραμμικά συστήματα. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2017. Available from: http://hdl.handle.net/10442/hedi/40384
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
27.
Jongerling, J.
There and Back : Modeling Inter-Individual Differences in Intra-Individual Variability.
Degree: 2016, University Utrecht
URL: https://dspace.library.uu.nl/handle/1874/341389
;
URN:NBN:NL:UI:10-1874-341389
;
1874/341389
;
urn:isbn:9789039366684
;
URN:NBN:NL:UI:10-1874-341389
;
https://dspace.library.uu.nl/handle/1874/341389
► This thesis focuses on modeling inter-individual differences in both stable- and developmental processes, where stable processes are characterized by within-person reversible variability over time in…
(more)
▼ This thesis focuses on modeling inter-individual differences in both stable- and developmental processes, where stable processes are characterized by within-person reversible variability over time in the absence of a gross underlying trend (Nesselroade, 1991), and developmental processes are characterized by structural change over time, with intra-individual variability occuring around an (individual's) mean trend or growth curve (Meredith & Tisak, 1990; Bollen & Curran, 2004, 2006).For the modeling of inter-individual differences in stable processes, intensively
sampled data, that is,
data sampled over a large number of repeated measurements (that are usually close together in time), is required and we focus on a dynamic multilevel model (DMM) that is based on modeling the repeated measures of an individual at level 1 using a time series model, while allowing for individual differences in the model parameters at level 2. Specifically we use a two level first-order autoregressive AR(1) model with random means, random autoregression, and random innovation variance (i.e., the level 1 residual variance). This model is more extensive than the models usually described in the literature, as it also allows for individual differences in error variance. In Chapter 2 of this thesis the estimation and interpretation of the model parameters is considered. In Chapter 3 an expression for the total variance of our DMM is derived, which is subsequently used to study the variance structure of the model in more detail. If intensively
sampled data is not available, models focussed more on systematic change trajectories can be used to gain valuable insight in the longitudinal process under study. For this non-intensively
sampled data, special attention is given to the the autoregressive latent trajectory (ALT) model that was introduced by Curran and Bollen (2001) (see also Bollen & Curran, 2004), and which combines a latent growth curve (LGC) model (Meredith & Tisak, 1990; Curran & Bollen, 2001; Bollen & Curran, 2004) with an autoregressive model (Jöreskog, 1971, 1979). Chapter 4 of the thesis examines two methods suggested by Curran and Bollen (2001) to deal with the recursion inherent to the ALT model, and paid special attention to the effect of these "start-up" methods on the model parameters. Chapters 5 and 6 of this thesis, are aimed at enabling applied researchers to analyze their own
data with either the ALT model, or a number of other models suitable for the study of both stable and developmental processes. Chapter 5 describes a multi-centre randomized trial cost-effectiveness study for the treatment of personality disorders. This study is used as an applied example for researchers, that outlines how the Deviance Information Criterium (DIC) (Spiegelhalter, Best, Carlin, & Linde, 2002) can be used to select the best fitting model, and how this best fitting model should be interpreted. Chapter 6 subsequently provides applied researchers with all the materials needed for analysis of their
data. Specifically, it provides…
Advisors/Committee Members: Hoijtink, Herbert, Hamaker, Ellen.
Subjects/Keywords: Multilevel; Autoregressive; Timeseries; Bayesian; Dynamic Multilevel Models; Intensively Sampled Data
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APA ·
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APA (6th Edition):
Jongerling, J. (2016). There and Back : Modeling Inter-Individual Differences in Intra-Individual Variability. (Doctoral Dissertation). University Utrecht. Retrieved from https://dspace.library.uu.nl/handle/1874/341389 ; URN:NBN:NL:UI:10-1874-341389 ; 1874/341389 ; urn:isbn:9789039366684 ; URN:NBN:NL:UI:10-1874-341389 ; https://dspace.library.uu.nl/handle/1874/341389
Chicago Manual of Style (16th Edition):
Jongerling, J. “There and Back : Modeling Inter-Individual Differences in Intra-Individual Variability.” 2016. Doctoral Dissertation, University Utrecht. Accessed March 04, 2021.
https://dspace.library.uu.nl/handle/1874/341389 ; URN:NBN:NL:UI:10-1874-341389 ; 1874/341389 ; urn:isbn:9789039366684 ; URN:NBN:NL:UI:10-1874-341389 ; https://dspace.library.uu.nl/handle/1874/341389.
MLA Handbook (7th Edition):
Jongerling, J. “There and Back : Modeling Inter-Individual Differences in Intra-Individual Variability.” 2016. Web. 04 Mar 2021.
Vancouver:
Jongerling J. There and Back : Modeling Inter-Individual Differences in Intra-Individual Variability. [Internet] [Doctoral dissertation]. University Utrecht; 2016. [cited 2021 Mar 04].
Available from: https://dspace.library.uu.nl/handle/1874/341389 ; URN:NBN:NL:UI:10-1874-341389 ; 1874/341389 ; urn:isbn:9789039366684 ; URN:NBN:NL:UI:10-1874-341389 ; https://dspace.library.uu.nl/handle/1874/341389.
Council of Science Editors:
Jongerling J. There and Back : Modeling Inter-Individual Differences in Intra-Individual Variability. [Doctoral Dissertation]. University Utrecht; 2016. Available from: https://dspace.library.uu.nl/handle/1874/341389 ; URN:NBN:NL:UI:10-1874-341389 ; 1874/341389 ; urn:isbn:9789039366684 ; URN:NBN:NL:UI:10-1874-341389 ; https://dspace.library.uu.nl/handle/1874/341389
University of Lund
28.
Thelander Andrén, Marcus.
On LQG-Optimal Event-Based Sampling.
Degree: 2020, University of Lund
URL: https://lup.lub.lu.se/record/8f3af775-387f-48ea-8b88-f9a9fb56c582
;
https://portal.research.lu.se/ws/files/86986914/thesis.pdf
► Event-based control is a promising concept for the design of resource-efficient feedback systems, where events such as sampling, actuation, and data transmissions are triggered reactively…
(more)
▼ Event-based control is a promising concept for the
design of resource-efficient feedback systems, where events such as
sampling, actuation, and data transmissions are triggered
reactively based on monitored control performance rather than a
periodic timer. In this thesis, we investigate how sampling and
communication events should be triggered to fully exploit the
potential of event-based control based on the classic
linear–quadratic–Gaussian (LQG) framework.The design of the event
trigger is formulated as a trade-off between a quadratic cost on
control performance and the average event rate. The optimal event
trigger is well-known for first-order systems, where it corresponds
to a scalar symmetric threshold on the monitored control
performance. In this thesis, we consider systems of higher order,
where the shape of the optimal threshold is generally unknown. For
two new system classes with previously unknown solutions, we prove
that the optimal threshold is ellipsoidal for all system orders.
Additionally, we propose two numerical methods for finding the
optimal threshold shape for general systems.Suboptimal but simpler
designs in the form of event-based proportional–integral–derivative
(PID) control are also considered. Inspired by results from
LQG-optimal sampled-data control, we derive an “ideal” (in the LQG
sense) sampled-data PID implementation, from which a range of
design options of varying complexity for event-based PID control is
proposed. Based on numerical evaluations, we present a proposal
implementation that strikes a balance between performance and
simplicity. Finally, this thesis also considers stochastic
triggering, where events are triggered according to a certain
probability. Two policies for stochastic triggering are proposed
for a remote state estimation problem, both featuring predictions
in the sensor for improved estimation performance. Both policies
compare well to other proposals from the literature, and one of the
policies also offers significantly simpler performance
analysis.
Subjects/Keywords: Control Engineering; Event-based control; LQG control; sampled-data control; Stochastic control; Event-based PID control; Event-based state estimation; stochastic triggering
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APA ·
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Export
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APA (6th Edition):
Thelander Andrén, M. (2020). On LQG-Optimal Event-Based Sampling. (Doctoral Dissertation). University of Lund. Retrieved from https://lup.lub.lu.se/record/8f3af775-387f-48ea-8b88-f9a9fb56c582 ; https://portal.research.lu.se/ws/files/86986914/thesis.pdf
Chicago Manual of Style (16th Edition):
Thelander Andrén, Marcus. “On LQG-Optimal Event-Based Sampling.” 2020. Doctoral Dissertation, University of Lund. Accessed March 04, 2021.
https://lup.lub.lu.se/record/8f3af775-387f-48ea-8b88-f9a9fb56c582 ; https://portal.research.lu.se/ws/files/86986914/thesis.pdf.
MLA Handbook (7th Edition):
Thelander Andrén, Marcus. “On LQG-Optimal Event-Based Sampling.” 2020. Web. 04 Mar 2021.
Vancouver:
Thelander Andrén M. On LQG-Optimal Event-Based Sampling. [Internet] [Doctoral dissertation]. University of Lund; 2020. [cited 2021 Mar 04].
Available from: https://lup.lub.lu.se/record/8f3af775-387f-48ea-8b88-f9a9fb56c582 ; https://portal.research.lu.se/ws/files/86986914/thesis.pdf.
Council of Science Editors:
Thelander Andrén M. On LQG-Optimal Event-Based Sampling. [Doctoral Dissertation]. University of Lund; 2020. Available from: https://lup.lub.lu.se/record/8f3af775-387f-48ea-8b88-f9a9fb56c582 ; https://portal.research.lu.se/ws/files/86986914/thesis.pdf
University of Illinois – Urbana-Champaign
29.
Jafarnejadsani, Hamidreza.
Robust adaptive sampled-data control design for MIMO systems: Applications in cyber-physical security.
Degree: PhD, Mechanical Engineering, 2018, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/102798
► This dissertation extends the L1 adaptive control theory to sampled-data (SD) framework. Multi-input multi-output non-square (underactuated) systems are considered with different sampling rates for inputs…
(more)
▼ This dissertation extends the L1 adaptive control theory to
sampled-
data (SD) framework. Multi-input multi-output non-square (underactuated) systems are considered with different sampling rates for inputs and outputs. The
sampled-
data framework allows to address non-minimum phase systems,
subject to less restrictive assumptions as compared to continuous time framework. It is shown that the closed-loop system can recover the response of a continuous-time reference system as the sampling time of the SD controller tends to zero. In this thesis, the L1
sampled data adaptive controller is integrated with the Simplex fault-tolerant architecture for resilient control of cyber-physical systems (CPSs). Detection and mitigation of zero-dynamics attacks are addressed and validated in flight tests of a quadrotor in Intelligent Robotics Laboratory of UIUC. The experiments show that the multirate L1 controller can e effectively detect stealthy zero-dynamics attacks and recover the stability of the perturbed system, where the single-rate conventional L1 adaptive controller fails.
From the perspective of applications, the dissertation considers navigation and control of autonomous vehicles and proposes a two-loop framework, in which the high-level reference commands are limited by a saturation function, while the low-level controller tracks the reference by compensating for disturbances and uncertainties. A class of nested, uncertain, multi-input multi-output (MIMO) systems
subject to reference command saturation, possibly with non-minimum phase zeros, is considered. Robust stability and performance of the overall closed-loop system with command saturation and multirate L1 adaptive controller are analyzed.
Finally, a systematic analysis and synthesis method is proposed for the optimal design of filters in the L1 adaptive output-feedback structure, where the lowpass filter is the key to the trade-off between the performance and robustness of the closed-loop system. An optimization problem is formulated using the constraint on the input time-delay margin and a cost-function based on mixed L1/H2-norm performance measure. The optimization problem can be efficiently solved using linear/quadratic programming.
We note that the framework of this dissertation and the multi-loop problem formulation of navigation and control of autonomous systems provide suitable synthesis and analysis tools for autonomous cyber-physical systems (CPSs), including self-driving cars, unmanned aerial vehicles (UAVs), and industrial/medical robots, to name just a few. The SD design facilitates the implementation of control laws on digital computers in CPSs, where the input/output signals are available at discrete time instances with different sampling rates.
Advisors/Committee Members: Hovakimyan, Naira (advisor), Hovakimyan, Naira (Committee Chair), Sha, Lui (committee member), Voulgaris, Petros (committee member), Salapaka, Srinivasa (committee member).
Subjects/Keywords: cyber-physical security; sampled-data systems; multi-level multirate control; L1 adaptive output-feedback control; uncertain multi-input multi-output systems; non-minimum phase systems; zero-dynamics attack; filter optimization
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APA ·
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APA (6th Edition):
Jafarnejadsani, H. (2018). Robust adaptive sampled-data control design for MIMO systems: Applications in cyber-physical security. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/102798
Chicago Manual of Style (16th Edition):
Jafarnejadsani, Hamidreza. “Robust adaptive sampled-data control design for MIMO systems: Applications in cyber-physical security.” 2018. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed March 04, 2021.
http://hdl.handle.net/2142/102798.
MLA Handbook (7th Edition):
Jafarnejadsani, Hamidreza. “Robust adaptive sampled-data control design for MIMO systems: Applications in cyber-physical security.” 2018. Web. 04 Mar 2021.
Vancouver:
Jafarnejadsani H. Robust adaptive sampled-data control design for MIMO systems: Applications in cyber-physical security. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/2142/102798.
Council of Science Editors:
Jafarnejadsani H. Robust adaptive sampled-data control design for MIMO systems: Applications in cyber-physical security. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/102798
30.
Omran, Hassan.
Contribution à la commande de systèmes non linéaires sous échantillonnage apériodique : Contribution to the control of nonlinear systems under aperiodic sampling.
Degree: Docteur es, Automatique, génie informatique, traitement du signal et images, 2014, Ecole centrale de Lille
URL: http://www.theses.fr/2014ECLI0005
► Cette thèse est dédiée à l’analyse de stabilité des systèmes non linéaires sous échantillonnage variant avec le temps. Lors de l’implémentation numérique d’un contrôleur qui…
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▼ Cette thèse est dédiée à l’analyse de stabilité des systèmes non linéaires sous échantillonnage variant avec le temps. Lors de l’implémentation numérique d’un contrôleur qui est calculé en temps-continu (approche par émulation), il est d'un grand intérêt de fournir des critères de stabilité et d’estimer la borne supérieure de l’intervalle d’échantillonnage qui garantit la stabilité du système en temps discret. Plusieurs travaux récents ont abordé ces questions dans le cas de modèles linéaires, mais la question a rarement été abordée dans une étude quantitative et formelle pour les systèmes non linéaires.Tout d'abord, le mémoire présente un aperçu sur les systèmes échantillonnés. Les défis et les principales méthodes pour l'analyse de stabilité sont présentés pour le cas des systèmes linéaires invariants dans le temps et celui des systèmes non linéaires. Ensuite, l’analyse de la stabilité locale des systèmes bilinéaires échantillonnés contrôlés par un retour d'état linéaire est considérée. Deux approches sont utilisées, la première basée sur la théorie des systèmes hybrides, la seconde basée sur l’analyse des ensembles invariants contractants. Cette dernière approche est inspirée par la théorie de la dissipativité. L’ensemble de ces résultats conduisent à des conditions suffisantes de stabilité exprimées sous forme LMI.Enfin, les conditions de stabilité basées sur la dissipativité sont étendues au cas des systèmes non linéaires affines en l'entrée. Les résultats sont ensuite repris dans le cas spécifique des systèmes non linéaires polynomiaux où les conditions de stabilité sont vérifiées numériquement en utilisant la décomposition en somme des carrés (SOS).
This PhD thesis is dedicated to the stability analyzis of nonlinear systems under sampled-data control, with arbitrarily time-varying sampling intervals. When a controller is designed in continuous-time, and then implemented digitally (emulation approach), it is of great interest to provide stability criteria, and to estimate the bound on the sampling intervals which guarantees the stability of the sampled-data system. Whereas several works deal with linear models, the issue has been rarely addressed in a formal quantitative study in the nonlinear case.First, an overview on sampled-data control is presented. Challenges and main methodologies for stability analysis are presented for both the linear time-invariant and the nonlinear cases.Then, local stability of bilinear sampled-data systems controlled by a linear state feedback is considered by using two approaches: the first one is based on hybrid systems theory; the second one is based on the analyzis of contractive invariant sets and is inspired by the dissipativity theory. Both approaches provide sufficient stability conditions in the form of LMI.Finally, the dissipativity–based stability conditions are extended for the more general case of nonlinear systems which are affine in the input, including the case of polynomial systems which leads to conditions in the form of sum of squares (SOS).
Advisors/Committee Members: Richard, Jean-Pierre (thesis director), Lamnabhi-Lagarrigue, Françoise (thesis director), Hetel, Laurentiu (thesis director).
Subjects/Keywords: Systèmes échantillonnées; Systèmes bilinéaires; Systèmes non linéaires; Systèmes dynamiquess hybrides; Echantillonnage apériodique; Stabilité; Dissipativité; Inégalités matricielles linéaires (LMIs); Somme des carrés (SOS); Sampled -data systems; Bilinear systems; Nonlinear systems; Hybrid dynamical systems; Aperiodic sampling; Stability; Dissipativity; Linear matrix inequalities (LMIs; Sum of squares (SOS)
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APA (6th Edition):
Omran, H. (2014). Contribution à la commande de systèmes non linéaires sous échantillonnage apériodique : Contribution to the control of nonlinear systems under aperiodic sampling. (Doctoral Dissertation). Ecole centrale de Lille. Retrieved from http://www.theses.fr/2014ECLI0005
Chicago Manual of Style (16th Edition):
Omran, Hassan. “Contribution à la commande de systèmes non linéaires sous échantillonnage apériodique : Contribution to the control of nonlinear systems under aperiodic sampling.” 2014. Doctoral Dissertation, Ecole centrale de Lille. Accessed March 04, 2021.
http://www.theses.fr/2014ECLI0005.
MLA Handbook (7th Edition):
Omran, Hassan. “Contribution à la commande de systèmes non linéaires sous échantillonnage apériodique : Contribution to the control of nonlinear systems under aperiodic sampling.” 2014. Web. 04 Mar 2021.
Vancouver:
Omran H. Contribution à la commande de systèmes non linéaires sous échantillonnage apériodique : Contribution to the control of nonlinear systems under aperiodic sampling. [Internet] [Doctoral dissertation]. Ecole centrale de Lille; 2014. [cited 2021 Mar 04].
Available from: http://www.theses.fr/2014ECLI0005.
Council of Science Editors:
Omran H. Contribution à la commande de systèmes non linéaires sous échantillonnage apériodique : Contribution to the control of nonlinear systems under aperiodic sampling. [Doctoral Dissertation]. Ecole centrale de Lille; 2014. Available from: http://www.theses.fr/2014ECLI0005
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