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University of Debrecen
1.
Adejuwon, Adeyemi.
Dynamic Systems Modeling
.
Degree: DE – TEK – Informatikai Kar, 2012, University of Debrecen
URL: http://hdl.handle.net/2437/129721 
In this work, a dynamic system was modeled using MATLAB. The trebuchet, a mediaval war artillery was modeled and it's properties such stability of the system, range and release angle were analyzed and presented using tables and charts.
Advisors/Committee Members: Baran, Sándor (advisor).Subjects/Keywords: Modeling;
Dynamic Systems
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APA (6th Edition):
Adejuwon, A. (2012). Dynamic Systems Modeling
. (Thesis). University of Debrecen. Retrieved from http://hdl.handle.net/2437/129721
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):
Adejuwon, Adeyemi. “Dynamic Systems Modeling
.” 2012. Thesis, University of Debrecen. Accessed October 19, 2019.
http://hdl.handle.net/2437/129721.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Adejuwon, Adeyemi. “Dynamic Systems Modeling
.” 2012. Web. 19 Oct 2019.
Vancouver:
Adejuwon A. Dynamic Systems Modeling
. [Internet] [Thesis]. University of Debrecen; 2012. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/2437/129721.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Adejuwon A. Dynamic Systems Modeling
. [Thesis]. University of Debrecen; 2012. Available from: http://hdl.handle.net/2437/129721
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
2.
Limpasurat, Akkharachai.
Coupled Modeling of Dynamic Reservoir/Well Interactions under Liquid-loading Conditions.
Degree: 2013, Texas A&M University
URL: http://hdl.handle.net/1969.1/151699
► Liquid loading in a gas well occurs when the upward gas flow rate is insufficient to lift the coproduced liquid to the surface, which results…
(more)
▼ Liquid loading in a gas well occurs when the upward gas flow rate is insufficient to lift the coproduced liquid to the surface, which results in an accumulation of liquid at the bottom of the well. The liquid column in the tubing creates backpressure on the formation, which decreases the gas production rate and may stop the well from flowing. To model these phenomena, the
dynamic interaction between the reservoir and the wellbore must be characterized. Due to wellbore phase re-distribution and potential phase-reinjection into the reservoir, the boundary conditions must be able to handle changing flow direction through the connections between the two subsystems.
This study presents a new formulation of the wellbore boundary condition used in reservoir simulators. The boundary condition uses the new state variable, the multiphase zero flow pressure (MPZFP, p^(0)), to determine flow direction in the connection grid block. If the wellbore pressure is less than the p^(0), the connection is producing; otherwise, it is injecting. The volumetric proportion of the flow is always determined by the upstream side.
The new reservoir simulator is used in coupled
modeling associated with liquid loading phenomena. The metastable condition can be modeled in a simple manner without any limiting assumptions and numerical stability problems.
We also applied this simulator for history matching of a gas well flowing with an intermittent production strategy. A basic transient wellbore model was developed for this purpose. The long-term tubinghead pressure (THP) history can be traced by our coupled simulation.
Our
modeling examples indicated that, the new wellbore boundary condition is suitable in
modeling the
dynamic interactions between reservoir and wellbore subsystems during liquid loading. The flow direction through the connection grid block can be automatically detected by our boundary condition without numerical difficulty during the course of the simulation. In addition, the capillary pressure can be accounted at the connection grid blocks when applying our new formulation in the reservoir simulator.
Advisors/Committee Members: Valko, Peter P (advisor), Falcone, Gioia (advisor), Teodoriu, Catalin (committee member), Barrufet, Maria A (committee member).
Subjects/Keywords: liquid loading problems; dynamic modeling
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APA (6th Edition):
Limpasurat, A. (2013). Coupled Modeling of Dynamic Reservoir/Well Interactions under Liquid-loading Conditions. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151699
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):
Limpasurat, Akkharachai. “Coupled Modeling of Dynamic Reservoir/Well Interactions under Liquid-loading Conditions.” 2013. Thesis, Texas A&M University. Accessed October 19, 2019.
http://hdl.handle.net/1969.1/151699.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Limpasurat, Akkharachai. “Coupled Modeling of Dynamic Reservoir/Well Interactions under Liquid-loading Conditions.” 2013. Web. 19 Oct 2019.
Vancouver:
Limpasurat A. Coupled Modeling of Dynamic Reservoir/Well Interactions under Liquid-loading Conditions. [Internet] [Thesis]. Texas A&M University; 2013. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/1969.1/151699.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Limpasurat A. Coupled Modeling of Dynamic Reservoir/Well Interactions under Liquid-loading Conditions. [Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151699
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Hawaii – Manoa
3.
Corrales, Jose.
A Statistical Dynamic Modulus Model of Hot Mix Asphalt Using Joint Estimation and Mixed-Effects Accounting for Effects of Confinement, Moisture and Additives.
Degree: 2017, University of Hawaii – Manoa
URL: http://hdl.handle.net/10125/51591
► Ph.D. University of Hawaii at Manoa 2016.
With the implementation of mechanistic-empirical pavement design methods, dynamic modulus (|E*|) has become the predominant characteristic of Hot…
(more)
▼ Ph.D. University of Hawaii at Manoa 2016.
With the implementation of mechanistic-empirical pavement design methods, dynamic modulus (|E*|) has become the predominant characteristic of Hot Mix Asphalt (HMA) used as the elastic modulus in the computation of stresses and strains in pavement structures. The predictions of |E*| obtained with the Witczak models currently used in the Mechanistic Empirical Pavement Design Guide (MEPDG) do not account for some HMA characteristics such as polymer modified binders, fibers, confinement and aging effects related to climatic conditions. Therefore, development of models more representative of local materials and conditions are desirable.
In this study, a predictive model for dynamic modulus of HMA was developed taking into consideration several HMA characteristics and testing conditions. 6821 observations of 257 mix specimens from three different laboratory datasets, two from Hawaii and one from Costa Rica, were used to estimate the model parameters. All three data sets contain information about some variables in common such as air voids, binder content, and gradation; however, some datasets contain mix characteristics and testing conditions not available in other datasets such as confinement level, available only in the Hawaiian datasets, and the number of freeze-thaw cycles, available only in the Costa Rican dataset. Important characteristics observed from these datasets include confinement, number of freeze-thaw cycles, binder modifiers (SBS polymers) and mixture additives (e.g. fibers and anti-stripping agents), all of which together with other commonly used variables were found to have statistically significant effects. The model was developed by using joint estimation and mixed-effects techniques. Joint estimation allowed the identification of model parameters available from only some of the databases and the determination of bias parameters. It also resulted in more efficient parameter estimates. The mixed-effects approach was used to account for unobserved heterogeneities between samples. Using these approaches, together with proper consideration of heteroscedasticity, allowed the estimation of a comprehensive statistical predictive model that satisfies closely all the regression assumptions and that provides accurate values of |E*| for Hawaiian and Costa Rican conditions for any combination of temperature and frequency. These can be used to generate the |E*| inputs that the MEPDG needs to compute |E*| master curves.
Subjects/Keywords: Asphalt Mixtures; Dynamic Modulus; Modeling
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APA (6th Edition):
Corrales, J. (2017). A Statistical Dynamic Modulus Model of Hot Mix Asphalt Using Joint Estimation and Mixed-Effects Accounting for Effects of Confinement, Moisture and Additives. (Thesis). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/51591
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):
Corrales, Jose. “A Statistical Dynamic Modulus Model of Hot Mix Asphalt Using Joint Estimation and Mixed-Effects Accounting for Effects of Confinement, Moisture and Additives.” 2017. Thesis, University of Hawaii – Manoa. Accessed October 19, 2019.
http://hdl.handle.net/10125/51591.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Corrales, Jose. “A Statistical Dynamic Modulus Model of Hot Mix Asphalt Using Joint Estimation and Mixed-Effects Accounting for Effects of Confinement, Moisture and Additives.” 2017. Web. 19 Oct 2019.
Vancouver:
Corrales J. A Statistical Dynamic Modulus Model of Hot Mix Asphalt Using Joint Estimation and Mixed-Effects Accounting for Effects of Confinement, Moisture and Additives. [Internet] [Thesis]. University of Hawaii – Manoa; 2017. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/10125/51591.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Corrales J. A Statistical Dynamic Modulus Model of Hot Mix Asphalt Using Joint Estimation and Mixed-Effects Accounting for Effects of Confinement, Moisture and Additives. [Thesis]. University of Hawaii – Manoa; 2017. Available from: http://hdl.handle.net/10125/51591
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of New Mexico
4.
Weldegiorgis, Mekdim.
On Dynamic Modulus of Asphalt Concrete for Moisture Damage.
Degree: Civil Engineering, 2014, University of New Mexico
URL: http://hdl.handle.net/1928/24357
► Dynamic modulus (E*) test has gained substantial acceptance in recent years for evaluating Hot Mix Asphalt (HMA) rutting and fatigue cracking performances. Indeed, the recently…
(more)
▼ Dynamic modulus (E*) test has gained substantial acceptance in recent years for evaluating Hot Mix Asphalt (HMA) rutting and fatigue cracking performances. Indeed, the recently developed Mechanistic Empirical Pavement Design Guide (MEPDG) uses E* data for stress and strain calculation, and E*-based models for prediction fatigue and rutting performances of a HMA pavement. Unfortunately, neither HMA mix design method nor the MEPDG uses E* value to evaluate moisture damage characteristics of HMA pavements. In fact, moisture damage is a very complex problem, and there exists no models for inclusion in the MEPDG for predicting moisture damage performance of HMA pavements. Rather, moisture damage performance of HMA is evaluated during the mix design state using the AASHTO T 283 test. According to AASHTO T 283 method, indirect tensile strength ratio of wet to dry samples is used as an indicator of moisture damage performance of a HMA mix. The AASHTO T 283 is a simple method, but it is not very reliable. In some cases, it gives false negative and positive values about the moisture damage characteristic of an HMA sample. To this end, this study attempts to study moisture damage in Asphalt Concrete (AC) sample by determining the loss in
dynamic modulus (E*) value based on continuum damage mechanics. The loss in E* is evaluated by calculating the ratio of wet E* to dry E* (DMR). In this study, E* testing is performed on five different asphalt mixtures. Three of the asphalt mixtures are plant produced Superpave mixes, and the other two are laboratory prepared HMA mix. The plant produced mixes include SP-II mix with asphalt binders Performance Grade (PG) PG 64-22, SP-III mix with PG 70-22, and SP-IV mix with PG 70-22. The laboratory mixes are SP-III mix with PG 64-22, and SP-II with binder PG 70-22. The E* test is conducted at five temperatures (-10, 4, 21, 37, 54 °C) and six frequencies (25, 10, 5, 1, 0.5, 0.1 Hz). The resulting E* data are used to generate time-temperature mastercurves. Also, the laboratory E* data is fitted to several models such as the viscosity (\u03b7) -based Witczak model, the
dynamic shear modulus (G*) -based Witczak models, and the Hirsch model. However, all models are found to underpredict the laboratory E* values. Therefore, the \u03b7-based Witczak model is modified to improve E* prediction accuracy in this study and E* ratios are used for evaluating moisture damage in AC. As mentioned above, the most common test method for evaluating moisture damage susceptibility of HMA mix is the AASHTO T 283. According to the AASHTO T 283, a dry asphalt concrete sample is vacuum saturated and then subjected to one cycle of freezing and thawing. However, one cycle of freeze-thaw does not simulate moisture condition resulting from repeated pore water pressure buildup and scouring cycles that occur when vehicle tires pass over a saturated pavement. Recently, Moisture Induced Sensitivity Tester (MIST) equipment can apply repeated pore pressure cycles inside an AC sample in the laboratory. Therefore, MIST…
Advisors/Committee Members: Tarefder, Rafiqul, Tarefder, Rafiqul, Maji, Arup, Taha, Mahmoud, Khraishi, Tariq.
Subjects/Keywords: Dynamic; Modulus; Modeling; Moisture; Damage
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APA (6th Edition):
Weldegiorgis, M. (2014). On Dynamic Modulus of Asphalt Concrete for Moisture Damage. (Doctoral Dissertation). University of New Mexico. Retrieved from http://hdl.handle.net/1928/24357
Chicago Manual of Style (16th Edition):
Weldegiorgis, Mekdim. “On Dynamic Modulus of Asphalt Concrete for Moisture Damage.” 2014. Doctoral Dissertation, University of New Mexico. Accessed October 19, 2019.
http://hdl.handle.net/1928/24357.
MLA Handbook (7th Edition):
Weldegiorgis, Mekdim. “On Dynamic Modulus of Asphalt Concrete for Moisture Damage.” 2014. Web. 19 Oct 2019.
Vancouver:
Weldegiorgis M. On Dynamic Modulus of Asphalt Concrete for Moisture Damage. [Internet] [Doctoral dissertation]. University of New Mexico; 2014. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/1928/24357.
Council of Science Editors:
Weldegiorgis M. On Dynamic Modulus of Asphalt Concrete for Moisture Damage. [Doctoral Dissertation]. University of New Mexico; 2014. Available from: http://hdl.handle.net/1928/24357
Texas A&M University
5.
Bommavaram, Ramamohan Reddy.
Evaluation of healing in asphalt binders using dynamic shear rheometer and molecular modeling techniques.
Degree: 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2919
► A self-healing material has the inherent ability to partially reverse damage such as crack formation that might have occurred during its service. Significant evidence exists…
(more)
▼ A self-healing material has the inherent ability to partially reverse damage such as crack
formation that might have occurred during its service. Significant evidence exists in the
literature to indicate that asphalt binder is a self-healing material. It is also well known
that healing has a substantial affect on the performance of asphalt mixtures and
consequently on the serviceable life of asphalt pavements. For example, shift factors from
laboratory experimental data to field observed data show that laboratory data underpredict
field observations. There is a need to understand the mechanisms that are
responsible for healing in asphalt binders as well as to develop test methods that can be
used to determine properties related to these mechanisms. This thesis presents details
and findings from a two-part study that addresses each one of these two aspects. In the
first part of this study, a test method based on the use of a
Dynamic Shear Rheometer
(DSR) was developed to determine the parameters of characteristic healing function of
asphalt binders. In the second part of this study, Molecular
Modeling (MM) techniques
were used to determine the interrelationship between molecular structure, surface free
energy, self diffusivity, and other healing properties of asphalt binders.The healing characteristic equation parameter (Ro) which represents the
instantaneous healing nature of the asphalt binders is analogous to surface energy in
terms of effect on healing in asphalt binders. Ro values for three asphalt binders AAM,
AAD and ABD are calculated and compared with the surface energy values available
from the literature. It was observed that the Ro values are proportional to surface energy
values. Surface energy values for five asphalt binders AAM, AAD, AAB, AAG and AAF
are calculated using MM method based on SHRP representative molecules. These values
were observed to be proportional to the surface energy values from literature. Bulk and
surface diffusion coefficients of asphalt molecules are calculated using MM method.
Parametric analysis was done to determine the effect of chemical structure of asphalt on
its diffusion properties. It was observed that the higher percentage of saturates in the
chemical structure results into higher diffusion coefficients.
Advisors/Committee Members: Dallas, Little (advisor), Amit, Bhasin (committee member), Charles, Glover (committee member), Eyad, Masad (committee member).
Subjects/Keywords: asphalt healing dynamic shera rheometer molecular modeling
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APA (6th Edition):
Bommavaram, R. R. (2009). Evaluation of healing in asphalt binders using dynamic shear rheometer and molecular modeling techniques. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2919
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):
Bommavaram, Ramamohan Reddy. “Evaluation of healing in asphalt binders using dynamic shear rheometer and molecular modeling techniques.” 2009. Thesis, Texas A&M University. Accessed October 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-2919.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bommavaram, Ramamohan Reddy. “Evaluation of healing in asphalt binders using dynamic shear rheometer and molecular modeling techniques.” 2009. Web. 19 Oct 2019.
Vancouver:
Bommavaram RR. Evaluation of healing in asphalt binders using dynamic shear rheometer and molecular modeling techniques. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2919.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bommavaram RR. Evaluation of healing in asphalt binders using dynamic shear rheometer and molecular modeling techniques. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2919
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
6.
Gupta, Ankush 1986-.
Dynamic Modeling and Cascaded Control for a Multi-Evaporator Supermarket Refrigeration System.
Degree: 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/148111
► The survey from US Department of Energy showed that about one-third of energy consumption in US is due to air conditioning and refrigeration systems. This…
(more)
▼ The survey from US Department of Energy showed that about one-third of energy consumption in US is due to air conditioning and refrigeration systems. This significant usage of electricity in the HVAC industry has prompted researchers to develop
dynamic models for the HVAC components, which leads to implementation of better control and optimization techniques. In this research, efforts are made to model a multi-evaporator system. A novel
dynamic modeling technique is proposed based on moving boundary method, which can be generalized for any number of evaporators in a vapor compression cycle. The models were validated experimentally on a commercial supermarket refrigeration unit. Simulation results showed that the models capture the major dynamics of the system in both the steady state and transient external disturbances. Furthermore the use of MEMS (microelectromechanical) based Silicon Expansion Valves (SEVs) have reportedly shown power savings as compared to the Thermal Expansion Valves (TEVs). Experimental tests were conducted on a supermarket refrigeration unit fitted with the MEMS valves to explain the cause of these potential energy savings. In this study an advanced cascaded control algorithm was also designed to control the MEMS valves. The performance of the cascaded control architecture was compared with the standard Thermal Expansion Valves (TEVs) and a commercially available Microstaq (MS) Superheat Controller (SHC). The results reveal that the significant efficiency gains derived on the SEVs are due to better superheat regulation, tighter superheat control and superior cooling effects in shorter time period which reduces the total run-time of the compressor. It was also observed that the duty cycle was least for the cascaded control algorithm. The reduction in duty cycle indicates early shut-off for the compressor resulting in maximum power savings for the cascaded control, followed by the Microstaq controller and then the Thermal Expansion Valves.
Advisors/Committee Members: Rasmussen, Bryan (advisor), Pate, Michael (committee member), Haberl, Jeff (committee member).
Subjects/Keywords: Cascaded Control; Silicon Expansion Valve; Dynamic Modeling
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APA ·
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APA (6th Edition):
Gupta, A. 1. (2012). Dynamic Modeling and Cascaded Control for a Multi-Evaporator Supermarket Refrigeration System. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148111
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):
Gupta, Ankush 1986-. “Dynamic Modeling and Cascaded Control for a Multi-Evaporator Supermarket Refrigeration System.” 2012. Thesis, Texas A&M University. Accessed October 19, 2019.
http://hdl.handle.net/1969.1/148111.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gupta, Ankush 1986-. “Dynamic Modeling and Cascaded Control for a Multi-Evaporator Supermarket Refrigeration System.” 2012. Web. 19 Oct 2019.
Vancouver:
Gupta A1. Dynamic Modeling and Cascaded Control for a Multi-Evaporator Supermarket Refrigeration System. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/1969.1/148111.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gupta A1. Dynamic Modeling and Cascaded Control for a Multi-Evaporator Supermarket Refrigeration System. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148111
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
7.
Liang, Shuangshuang.
Dynamic Modeling and Wavelet-Based Multi-Parametric Tuning and Validation for HVAC Systems.
Degree: 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/153322
► Dynamic Heating, Ventilation, and Air-Conditioning (HVAC) system models are used for the purpose of control design, fault detection and diagnosis, system analysis, design and optimization.…
(more)
▼ Dynamic Heating, Ventilation, and Air-Conditioning (HVAC) system models are used for the purpose of control design, fault detection and diagnosis, system analysis, design and optimization. Therefore, ensuring the accuracy and reliability of the
dynamic models is important before their application. Parameter tuning and model validation is a crucial way to improve the accuracy and reliability of the
dynamic models. Traditional parameter tuning and validation methods are generally time-consuming, inaccurate and can only handle a limited number of tuning parameters. This is especially true for multiple-input-multiple-output (MIMO) models due to their intrinsic complexity.
This dissertation proposes a new automatic parameter tuning and validation approach to address this problem. In this approach, a fast and accurate model is derived using linearization. Discrete-time convolution is then applied on this linearized model to generate the model outputs. These outputs and data are then processed through wavelet decomposition, and the corresponding wavelet coefficients obtained from it are used to establish the objective function. Wavelets are advantageous in capturing the
dynamic information hidden in the time series. The objective function is then optimized iteratively using a hybrid method consisting of a global search genetic algorithm (GA) and a local gradient search method.
In order to prove the feasibility and robustness of the proposed approach, it is applied on different
dynamic models. These models include an HVAC system model with moving boundary (MB) heat exchanger models, a heat pump model with finite control volume (FCV) heat exchanger models, and a lumped parameter residential conditioned space model. These models generally have a large number of parameters which need tuning. The proposed method is proved to be efficient in tuning single data set, and can also tune the models using multiple experimental or field data sets with
different operating conditions. The tuned parameters are further cross-validated using other data sets with different operating conditions. The results also indicate the proposed method can effectively tune the model using both static and transient data simultaneously.
Advisors/Committee Members: Rasmussen, Bryan (advisor), Haberl, Jeff (committee member), McAdams, Daniel (committee member), Pate, Michael (committee member).
Subjects/Keywords: Parameter tuning; HVAC; Dynamic Modeling; Validation
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APA (6th Edition):
Liang, S. (2014). Dynamic Modeling and Wavelet-Based Multi-Parametric Tuning and Validation for HVAC Systems. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153322
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):
Liang, Shuangshuang. “Dynamic Modeling and Wavelet-Based Multi-Parametric Tuning and Validation for HVAC Systems.” 2014. Thesis, Texas A&M University. Accessed October 19, 2019.
http://hdl.handle.net/1969.1/153322.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Liang, Shuangshuang. “Dynamic Modeling and Wavelet-Based Multi-Parametric Tuning and Validation for HVAC Systems.” 2014. Web. 19 Oct 2019.
Vancouver:
Liang S. Dynamic Modeling and Wavelet-Based Multi-Parametric Tuning and Validation for HVAC Systems. [Internet] [Thesis]. Texas A&M University; 2014. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/1969.1/153322.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Liang S. Dynamic Modeling and Wavelet-Based Multi-Parametric Tuning and Validation for HVAC Systems. [Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153322
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Hawaii – Manoa
8.
Wolfe, Michael Alan.
Design and control methods for a conjoined automotive regenerative braking dynamic system.
Degree: 2016, University of Hawaii – Manoa
URL: http://hdl.handle.net/10125/101758
► M.S. University of Hawaii at Manoa 2010.
Along with the diminishing supplies of fossil fuels, the continually increasing price of oil, and the deterioration of…
(more)
▼ M.S. University of Hawaii at Manoa 2010.
Along with the diminishing supplies of fossil fuels, the continually increasing price of oil, and the deterioration of the environment as an effect of fossil fueled vehicles, the world now focuses its attention on green energy and vehicle hybridization. This has given rise to many alternatives in internal combustion engine vehicle hybridization such as the parallel and series hybrids, as well as plug-in hybrid electric vehicles. This paper proposes a new method of hybridization which allows ICE vehicles to be retrofitted to take advantage of regenerative braking and acceleration assistance. The conjoined automotive regenerative braking system is a small trailer like device that can be attached via trailer hitch to the ICE vehicle in order to create a pseudo parallel hybrid.
The CARB will be connected to the trailer hitch of the ICE vehicle through a series elastic element in order to filter impulse shock loads as well as provide stability and robustness in force control. This thesis explains the dynamic modeling of the system as well as the response of the system to varying control schemes.
Firstly, the system was analyzed analytically as a Series Elastic Actuator. The system model is very simple and a PD force controller is implemented to regulate the force in the spring connecting the CARB and the Vehicle. The closed loop transfer function is determined and the step response of the system was analyzed to determine that the closed loop natural frequency of the system needed to be above 100Hz in order for the transients in the response to die out within half of a second.
Secondly, a simulink model of the system was created. A linear damper is added in parallel with the series elastic element between the vehicle and the CARB. The system input is a feed forward desired force for the vehicle determined from the Federal Urban Driving Schedule and the mass of the vehicle. A proportion of this feed forward desired force of the car is used as the desired force from the CARB. A PID controller regulates the torque of the CARB to minimize the force error between the desired force and the load force. The control parameters for this load force control scheme are determined using the signal constraint block in simulink and are determined for a variety of linear spring constants and linear damping constants. The velocity error of the system velocity response versus FUDS is less than 0.3 m/s for any simulation, and the load force error was limited to less than 150 N. The power used by the vehicle was shown to be significantly lessened by the addition of the CARB.
Thirdly a more detailed Simulink model was created using the Simscape toolbox which allowed for highly detailed simulated physical entities, such as drivelines, inertias, electronics, etc. This system uses a battery model and DC/DC converter which is connected to a 50kW PMSM to simulate the electronics of the CARB, The longitudinal and tire dynamics of the car and of the system are accounted for. A model of an ICE was used to…
Subjects/Keywords: Dynamic System Modeling; Simulink; PID Control
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APA (6th Edition):
Wolfe, M. A. (2016). Design and control methods for a conjoined automotive regenerative braking dynamic system. (Thesis). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/101758
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):
Wolfe, Michael Alan. “Design and control methods for a conjoined automotive regenerative braking dynamic system.” 2016. Thesis, University of Hawaii – Manoa. Accessed October 19, 2019.
http://hdl.handle.net/10125/101758.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wolfe, Michael Alan. “Design and control methods for a conjoined automotive regenerative braking dynamic system.” 2016. Web. 19 Oct 2019.
Vancouver:
Wolfe MA. Design and control methods for a conjoined automotive regenerative braking dynamic system. [Internet] [Thesis]. University of Hawaii – Manoa; 2016. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/10125/101758.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wolfe MA. Design and control methods for a conjoined automotive regenerative braking dynamic system. [Thesis]. University of Hawaii – Manoa; 2016. Available from: http://hdl.handle.net/10125/101758
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
9.
Bowen, Landen Albert.
A Dynamic Modeling Approach and Optimization Framework for
the Design of Self-folding Origami Structures.
Degree: PhD, Mechanical Engineering, 2016, Penn State University
URL: https://etda.libraries.psu.edu/catalog/m900nt40f
► Origami has been of recent interest to the engineering community due to its simple assembly process (folding), the capacity to create an infinite number of…
(more)
▼ Origami has been of recent interest to the engineering
community due to its simple assembly process (folding), the
capacity to create an infinite number of shapes from a single
sheet, and the ability to fold compactly yet deploy into a larger
state at a later time. Of particular interest in the field of
origami engineering is self-folding, in which an origami-inspired
design is capable of folding (and unfolding) into a specified
target shape using one or more active materials. While several
modeling methods have been utilized previously to simulate
origami-inspired designs, none have the capacity to quickly
simulate an entire self-folding model. In this work, a dynamic
model of self-folding origami structures is developed to enable a
simulation-based approach to the design of these novel structures.
In the dynamic model, the flat panels in an origami structure are
modeled as rigid links and the creases as joints with torsional
stiffness and damping. These approximations are qualitatively
validated through the modeling and investigation of a bistable
origami waterbomb base and a deployable optical shield planned for
use in a future NASA mission. In both cases, the dynamic model
allows for investigation of the kinematics as well as the forces
developed in the joints, yielding interesting new insights into
both designs. These insights include a quantitative exploration of
how the energy stored in the waterbomb as it is displaced from its
stable equilibrium position leads to its bistable nature and a
distinct, oscillatory pattern found in both the deployment motion
and joint forces of the deployable optical shield. To enable the
dynamic simulation of self-folding, approximations of two active
materials used previously for self-folding, namely, magneto-active
elastomer (MAE) and electroactive polymer (EAP), are developed for
use in the dynamic model. Each approximation is validated through
the comparison of a self-folding experiment with a corresponding
dynamic model, resulting in good correlation between simulated and
experimental results. A multi-field structure that uses both active
materials is then designed, and, upon fabrication and
experimentation, is found to correlate well with simulated results.
With the self-folding model validated, it can be used in the design
of new self-folding structures. In order to better determine active
material placement and minimize the amount of material required for
a given design, the dynamic model is integrated with a trade space
exploration software: the ARL Trade Space Visualizer. Using this
software, the entire trade space of a self-folding structure can be
readily explored, and the optimal designs determined. This process
is utilized to optimize magneto-active material orientations and
placements for two different origami structures. This same process
can also be used to determine EAP amounts and placements. Finally,
a generalized optimization framework for the design of self-folding
origami structures is presented that incorporates many of the
concepts developed in this work…
Subjects/Keywords: origami; compliant mechanisms; dynamic modeling;
self-folding
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APA (6th Edition):
Bowen, L. A. (2016). A Dynamic Modeling Approach and Optimization Framework for
the Design of Self-folding Origami Structures. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/m900nt40f
Chicago Manual of Style (16th Edition):
Bowen, Landen Albert. “A Dynamic Modeling Approach and Optimization Framework for
the Design of Self-folding Origami Structures.” 2016. Doctoral Dissertation, Penn State University. Accessed October 19, 2019.
https://etda.libraries.psu.edu/catalog/m900nt40f.
MLA Handbook (7th Edition):
Bowen, Landen Albert. “A Dynamic Modeling Approach and Optimization Framework for
the Design of Self-folding Origami Structures.” 2016. Web. 19 Oct 2019.
Vancouver:
Bowen LA. A Dynamic Modeling Approach and Optimization Framework for
the Design of Self-folding Origami Structures. [Internet] [Doctoral dissertation]. Penn State University; 2016. [cited 2019 Oct 19].
Available from: https://etda.libraries.psu.edu/catalog/m900nt40f.
Council of Science Editors:
Bowen LA. A Dynamic Modeling Approach and Optimization Framework for
the Design of Self-folding Origami Structures. [Doctoral Dissertation]. Penn State University; 2016. Available from: https://etda.libraries.psu.edu/catalog/m900nt40f
University of Sydney
10.
Shephard, Grace.
Linking deep Earth structure and surface topography through geodynamic models
.
Degree: 2013, University of Sydney
URL: http://hdl.handle.net/2123/10184
► It is known that deep Earth and surface processes are intimately linked across broad spatial-temporal scales, however, quantifying this interaction remains elusive. The emergence of…
(more)
▼ It is known that deep Earth and surface processes are intimately linked across broad spatial-temporal scales, however, quantifying this interaction remains elusive. The emergence of coupled plate tectonic and mantle convection, “geodynamic,” models has been facilitated by recent advances in computational resources, numerical solutions of mantle flow and plate model resolution.
Five absolute reference frames based on hotspot tracks, palaeomagnetic data and subducted slabs are compared, resulting in differences in plate boundary locations of up to 3000 km and in plate velocities of up to 10 cm/yr. Through a comparison to seismic tomography, differences in predicted mantle structure for features ~20,000 km wide are largely due to velocity variability, and are best reproduced in hotspot frames. Shorter wavelength differences (<4,000 km) are attributed to plate boundary locations and are best reproduced with hybrid hotspot-palaeomagnetic frames.
The Jurassic-Cretaceous history of the circum-Arctic is one of the most poorly constrained realms in global plate reconstructions. A revised regional model since 200 Ma, with connected plate boundaries is presented, focusing on the opening and closing the South Anuyi and Oimyakon oceans, the Amerasia Basin and Panthalassa. Tomographic and geodynamic evidence for these oceans are found under present-day Greenland, Siberia and North America. The time-dependent models also suggest an alternative interpretation of the location and affinities of the “Farallon” and “Mongol-Okhotsk” slabs.
A powerful outcome of geodynamic models is the evolution of dynamic topography. We suggest that at least 50% of the anomalously deep Argentine Basin can be attributed to long-lived, slab-driven negative dynamic topography. Similarly, for the Arctic, an evolving trend of subsidence from at least the Mid Jurassic to Early Cenozoic, followed by uplift or slowed subsidence to present-day is modelled. This signal is shown to partly account for vertical motions observed at the Barents Sea, Alaska and Slave Craton.
This thesis shows that a careful consideration of absolute and relative plate reconstructions and modelling parameters, coupled with comparisons to seismic tomography and independent geological constraints, can provide key insights into the dynamic plate-mantle system.
Subjects/Keywords: dynamic topography;
plate tectonics;
mantle modeling;
Arctic
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APA (6th Edition):
Shephard, G. (2013). Linking deep Earth structure and surface topography through geodynamic models
. (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/10184
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):
Shephard, Grace. “Linking deep Earth structure and surface topography through geodynamic models
.” 2013. Thesis, University of Sydney. Accessed October 19, 2019.
http://hdl.handle.net/2123/10184.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shephard, Grace. “Linking deep Earth structure and surface topography through geodynamic models
.” 2013. Web. 19 Oct 2019.
Vancouver:
Shephard G. Linking deep Earth structure and surface topography through geodynamic models
. [Internet] [Thesis]. University of Sydney; 2013. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/2123/10184.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shephard G. Linking deep Earth structure and surface topography through geodynamic models
. [Thesis]. University of Sydney; 2013. Available from: http://hdl.handle.net/2123/10184
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Tech
11.
Zaghlool, Shaza B.
Dynamic Causal Modeling Across Network Topologies.
Degree: PhD, Electrical and Computer Engineering, 2014, Virginia Tech
URL: http://hdl.handle.net/10919/46874
► Dynamic Causal Modeling (DCM) uses dynamical systems to represent the high-level neural processing strategy for a given cognitive task. The logical network topology of the…
(more)
▼ Dynamic Causal
Modeling (DCM) uses dynamical systems to represent the high-level neural
processing strategy for a given cognitive task. The logical network topology of the model is
specified by a combination of prior knowledge and statistical analysis of the neuro-imaging
signals. Parameters of this a-priori model are then estimated and competing models are
compared to determine the most likely model given experimental data. Inter-
subject analysis
using DCM is complicated by differences in model topology, which can vary across subjects
due to errors in the first-level statistical analysis of fMRI data or variations in cognitive
processing. This requires considerable judgment on the part of the experimenter to decide
on the validity of assumptions used in the
modeling and statistical analysis; in particular,
the dropping of subjects with insufficient activity in a region of the model and ignoring
activation not included in the model. This manual data filtering is required so that the
fMRI model's network size is consistent across subjects.
This thesis proposes a solution to this problem by treating missing regions in the first-
level analysis as missing data, and performing estimation of the time course associated with
any missing region using one of four candidate methods: zero-filling, average-filling, noise-
filling using a fixed stochastic process, or one estimated using expectation-maximization.
The effect of this estimation scheme was analyzed by treating it as a preprocessing step to
DCM and observing the resulting effects on model evidence. Simulation studies show that
estimation using expectation-maximization yields the highest classification accuracy using a
simple loss function and highest model evidence, relative to other methods. This result held
for various dataset sizes and varying numbers of model choice. In real data, application to
Go/No-Go and Simon tasks allowed computation of signals from the missing nodes and the
consequent computation of model evidence in all subjects compared to 62 and 48 percent
respectively if no preprocessing was performed. These results demonstrate the face validity
of the preprocessing scheme and open the possibility of using single-
subject DCM as an
individual cognitive phenotyping tool.
Advisors/Committee Members: Wyatt, Christopher L. (committeechair), LaConte, Stephen Michael (committee member), Laurienti, Paul James (committee member), Beex, Aloysius A. (committee member), Baumann, William T. (committee member).
Subjects/Keywords: Dynamic Causal Modeling; Expectation-Maximization; Missing Data
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APA (6th Edition):
Zaghlool, S. B. (2014). Dynamic Causal Modeling Across Network Topologies. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/46874
Chicago Manual of Style (16th Edition):
Zaghlool, Shaza B. “Dynamic Causal Modeling Across Network Topologies.” 2014. Doctoral Dissertation, Virginia Tech. Accessed October 19, 2019.
http://hdl.handle.net/10919/46874.
MLA Handbook (7th Edition):
Zaghlool, Shaza B. “Dynamic Causal Modeling Across Network Topologies.” 2014. Web. 19 Oct 2019.
Vancouver:
Zaghlool SB. Dynamic Causal Modeling Across Network Topologies. [Internet] [Doctoral dissertation]. Virginia Tech; 2014. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/10919/46874.
Council of Science Editors:
Zaghlool SB. Dynamic Causal Modeling Across Network Topologies. [Doctoral Dissertation]. Virginia Tech; 2014. Available from: http://hdl.handle.net/10919/46874
Virginia Tech
12.
Matrangola, Sara Louise.
An experimental and simulation based approach toward understanding the effects of obesity on balance recovery from a postural perturbation.
Degree: PhD, Biomedical Engineering, 2011, Virginia Tech
URL: http://hdl.handle.net/10919/39388
► Obesity is associated with an increased risk of falls and subsequent injury. Most falls result from some type of postural perturbation. As such, it is…
(more)
▼ Obesity is associated with an increased risk of falls and subsequent injury. Most falls result from some type of postural perturbation. As such, it is important to understand how obesity influences balance recovery from a postural perturbation. There is limited information on the effects of obesity on balance recovery, and the limited available information is ambiguous. Therefore, the purpose of the research within this dissertation was to investigate the effects of obesity on balance recovery after a postural perturbation in young adults to better understand how obesity contributes to fall risk.
Four separate studies make up this dissertation. The purpose of the first study was to investigate the effects of obesity on balance recovery ability using an ankle strategy in young adults. Normal-weight and obese participants recovered balance using an ankle strategy after three types of postural perturbations: an initial angular displacement, an initial angular velocity from the natural stance, and an initial angular velocity from a prescribed position. Obese participants were unable to recover balance using an ankle strategy as well as normal-weight participants when perturbations involved an initial angular velocity. However, no differences between obese and normal-weight participants were found when perturbations only involved an initial angular displacement. The effect of obesity on balance recovery in young adults was dependent on the perturbation characteristics, and may be explained by a possible beneficial effect of increased inertia on balance recovery after perturbations with little or no initial angular velocity.
The purpose of the second study was to examine the effects of obesity on balance recovery by stepping in young adults. The ankle strategy has the benefit of simplifying the mechanics of balance recovery, but limits generalizability to more realistic fall scenarios where stepping to extend the base of support and recover balance is desired. Similar to the first study, participants attempted to recover balance following two types of postural perturbations: an initial angular displacement from an upright stance (by releasing participants from a static forward lean), and an initial angular velocity while in an upright stance (using a translating platform). In contrast to the first study, the ability to recover balance with a single-step did not differ between young normal-weight and obese adults. These results suggest that the reported increase in fall risk in obese adults is not a result of impaired balance recovery ability (at least among young adults that were tested here).
The third study examined the effects of obesity on body kinematics immediately following a trip-like perturbation in young adults. Obesity was found to increase body angular velocity the perturbation, and that increases in body angular velocity were associated with an increased probability of a failed recovery. These results suggest that when a young obese and young normal-weight individual trip while walking…
Advisors/Committee Members: Madigan, Michael L. (committeechair), Nussbaum, Maury A. (committee member), Davy, Kevin P. (committee member), Davidson, Bradley S. (committee member), Marsh, Anthony P. (committee member).
Subjects/Keywords: falls; balance recovery; obesity; forward dynamic modeling
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APA (6th Edition):
Matrangola, S. L. (2011). An experimental and simulation based approach toward understanding the effects of obesity on balance recovery from a postural perturbation. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/39388
Chicago Manual of Style (16th Edition):
Matrangola, Sara Louise. “An experimental and simulation based approach toward understanding the effects of obesity on balance recovery from a postural perturbation.” 2011. Doctoral Dissertation, Virginia Tech. Accessed October 19, 2019.
http://hdl.handle.net/10919/39388.
MLA Handbook (7th Edition):
Matrangola, Sara Louise. “An experimental and simulation based approach toward understanding the effects of obesity on balance recovery from a postural perturbation.” 2011. Web. 19 Oct 2019.
Vancouver:
Matrangola SL. An experimental and simulation based approach toward understanding the effects of obesity on balance recovery from a postural perturbation. [Internet] [Doctoral dissertation]. Virginia Tech; 2011. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/10919/39388.
Council of Science Editors:
Matrangola SL. An experimental and simulation based approach toward understanding the effects of obesity on balance recovery from a postural perturbation. [Doctoral Dissertation]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/39388
13.
Barlukova, Ayuna.
Dynamic instability of microtubules and effect of microtubule targeting agents : Development of a pre-industrial prototype of a heat pump for simultaneous heating and cooling small to medium heating power.
Degree: Docteur es, Mathématiques, 2017, Aix Marseille Université
URL: http://www.theses.fr/2017AIXM0064
► L'objectif de cette thèse est de proposer des modèles mathématiques permettant de décrire l'instabilité dynamique d'une population de microtubules (MTs) et l'effet de médicaments sur…
(more)
▼ L'objectif de cette thèse est de proposer des modèles mathématiques permettant de décrire l'instabilité dynamique d'une population de microtubules (MTs) et l'effet de médicaments sur cette instabilité. L'instabilité dynamique des MTs joue un rôle extrêmement important dans les processus de la mitose et de la migration cellulaire et donc dans la progression tumorale. L'instabilité dynamique est un processus complexe qui implique différents états de la tubuline (polymérisée ou non-polymérisée, tubuline-GTP ou tubuline-GDP qui correspondent à deux états énergétiques différents des dimères) et qui résulte de processus chimiques (polymérisation, dépolymérisation, hydrolyse, recyclage, nucléation) liant ces différents états de la tubuline. Décrire cette complexité par le biais de modèles mathématiques permet alors de tester des hypothèses biologiques quant à l'impact de chacun de ces processus et l'action de molécules anti-MTs. De récents travaux suggèrent que le "vieillissement" des MTs impacte leur dynamique. Nous avons testé dans ce travail l'hypothèse que ce "vieillissement" accélère l'hydrolyse du GTP au sein de la tubuline. Nous avons construit de nouveaux modèles couplant deux équations de transport multi-D avec deux équations différentielles ordinaires impliquant des termes intégraux. Nous avons calibrer notre nouveau modèle à partir des données expérimentales; tester l'hypothèse biologique sur le mécanisme du processus de vieillissement; analyser la sensibilité du modèle par rapport aux paramètres décrivant les processus; tester différentes hypothèses quant l'effet des médicaments anti-MTs.
The aim of this thesis is to design new mathematical models that are able to appropriately describe dynamic instability of a population of microtubules (MTs) and effect of drugs on MT dynamics. MT dynamic instability play an important role in the processes of mitosis and cell migration and, thus, in cancer progression. Dynamic instability is a complex process that involves different states of tubulin (polymerized or non-polymerized, GTP-tubulin or GDPtubulin that correspond to two different energetic states of tubulin dimers) that resulted from chemical processes (polymerization, depolymerization, hydrolysis, recycling, nucleation) linking these different states of tubulin. Description of this complexity by mathematical models enables one to test biological hypotheses concerning the impact of each process and action of drugs on microtubule dynamics. Recent observations show that MT dynamics depends on aging of MT. One of the aims of the work is to test the hypothesis that MT aging results from the acceleration of the GTP hydrolysis. We construct for that new models that couple two multidimensional transport equations with two ordinary differential equations involving integral terms. We have calibrated our models on the basis of experimental data; tested biological hypothesis on mechanism of aging process; performed a sensitivity analysis of the model with respect to parameters describing chemical processes; and tested…
Advisors/Committee Members: Hubert, Florence (thesis director), Honoré, Stéphane (thesis director).
Subjects/Keywords: .; Microtubule; Dynamic instabilty; Modeling; Paclitaxel; 510
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APA (6th Edition):
Barlukova, A. (2017). Dynamic instability of microtubules and effect of microtubule targeting agents : Development of a pre-industrial prototype of a heat pump for simultaneous heating and cooling small to medium heating power. (Doctoral Dissertation). Aix Marseille Université. Retrieved from http://www.theses.fr/2017AIXM0064
Chicago Manual of Style (16th Edition):
Barlukova, Ayuna. “Dynamic instability of microtubules and effect of microtubule targeting agents : Development of a pre-industrial prototype of a heat pump for simultaneous heating and cooling small to medium heating power.” 2017. Doctoral Dissertation, Aix Marseille Université. Accessed October 19, 2019.
http://www.theses.fr/2017AIXM0064.
MLA Handbook (7th Edition):
Barlukova, Ayuna. “Dynamic instability of microtubules and effect of microtubule targeting agents : Development of a pre-industrial prototype of a heat pump for simultaneous heating and cooling small to medium heating power.” 2017. Web. 19 Oct 2019.
Vancouver:
Barlukova A. Dynamic instability of microtubules and effect of microtubule targeting agents : Development of a pre-industrial prototype of a heat pump for simultaneous heating and cooling small to medium heating power. [Internet] [Doctoral dissertation]. Aix Marseille Université 2017. [cited 2019 Oct 19].
Available from: http://www.theses.fr/2017AIXM0064.
Council of Science Editors:
Barlukova A. Dynamic instability of microtubules and effect of microtubule targeting agents : Development of a pre-industrial prototype of a heat pump for simultaneous heating and cooling small to medium heating power. [Doctoral Dissertation]. Aix Marseille Université 2017. Available from: http://www.theses.fr/2017AIXM0064
University of Illinois – Urbana-Champaign
14.
Kawamura, Malia L.
Dynamic modeling and hardware in the loop testing of chemical processes.
Degree: MS, Mechanical Engineering, 2017, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/97451
► This thesis presents a framework for hardware-in-the-loop (HIL) testing of chemical plants. HIL testing is a widespread tool used in industry and academia to bridge…
(more)
▼ This thesis presents a framework for hardware-in-the-loop (HIL) testing of chemical plants. HIL testing is a widespread tool used in industry and academia to bridge the gap between computer simulations and physical experimentation. It provides many advantages to the standard development path of building a physical prototype and then running tests. Benefits of HIL testing include decreased development time, reduced cost, increased safety, and better control algorithm development. For this work, HIL testing consists of an emulated real-time chemical plant and a real physical controller.
This HIL testing setup requires two main thrusts – the development of a
dynamic model for chemical plants and the implementation of an emulated real-time plant and a real physical controller in hardware. A user-friendly, modular, scalable,
dynamic, and nonlinear first principles
modeling toolkit is developed in Matlab Simulink. The toolkit contains individual chemical plant components such as a continuous stirred tank reactor (CSTR), pump, and valve. Experimental validation of the chemical concentration models and an example plant model are included. Next, for the hardware and control implementation tasks, National Instrument’s VeriStand software is used to integrate a Simulink model to run in real-time on NI hardware. A myRIO is used as a real physical controller, programmed in LabVIEW, to control the emulated real-time chemical plant running on a CompactRIO. A chemical plant which forms propylene glycol in a CSTR is utilized as a case study. However, the HIL testing framework developed is widely applicable to real physical systems to decrease development time and increase safety.
Advisors/Committee Members: Alleyne, Andrew G (advisor).
Subjects/Keywords: Hardware-in-the-loop; Dynamic modeling; Controls
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APA (6th Edition):
Kawamura, M. L. (2017). Dynamic modeling and hardware in the loop testing of chemical processes. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/97451
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):
Kawamura, Malia L. “Dynamic modeling and hardware in the loop testing of chemical processes.” 2017. Thesis, University of Illinois – Urbana-Champaign. Accessed October 19, 2019.
http://hdl.handle.net/2142/97451.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kawamura, Malia L. “Dynamic modeling and hardware in the loop testing of chemical processes.” 2017. Web. 19 Oct 2019.
Vancouver:
Kawamura ML. Dynamic modeling and hardware in the loop testing of chemical processes. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2017. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/2142/97451.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kawamura ML. Dynamic modeling and hardware in the loop testing of chemical processes. [Thesis]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/97451
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Rochester Institute of Technology
15.
Clark, K Jeselle.
Simulating Pathway-Based Steady States to Prevent Epithelial- Mesenchymal Transition in Ovarian Cancer.
Degree: MS, Thomas H. Gosnell School of Life Sciences (COS), 2019, Rochester Institute of Technology
URL: https://scholarworks.rit.edu/theses/10000
► Ovarian cancer is a complex disease that involves gene regulatory dysfunction and that requires a systemic viewpoint to fully understand. Applying executable biology to…
(more)
▼ Ovarian cancer is a complex disease that involves gene regulatory dysfunction and that requires a systemic viewpoint to fully understand. Applying executable biology to ovarian cancer research and leveraging documented regulatory protein interactions, one can efficiently inform the prediction of characteristic gene-product activation using a logical model checking approach. Using this innovative approach to reducing terms and satisfying constraints, this thesis presents a strategy for applying regulatory systems biology to cancer research. By viewing ovarian cancer pathways like an electrical circuit, and constructing a pathway model with natural language processing tools, gene product expression patterns that have not been explained by traditional wet-bench biology are able to be predicted in silico. This research yields seven gene products whose perturbation is predicted to be sufficient to induce the epithelial-mesenchymal transition of ovarian cancer.
Advisors/Committee Members: Gary R. Skuse, Gordon Broderick, Matthew Morris.
Subjects/Keywords: Cancer; Discrete; Dynamic; Modeling; Ovarian; Pathways
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APA (6th Edition):
Clark, K. J. (2019). Simulating Pathway-Based Steady States to Prevent Epithelial- Mesenchymal Transition in Ovarian Cancer. (Masters Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/10000
Chicago Manual of Style (16th Edition):
Clark, K Jeselle. “Simulating Pathway-Based Steady States to Prevent Epithelial- Mesenchymal Transition in Ovarian Cancer.” 2019. Masters Thesis, Rochester Institute of Technology. Accessed October 19, 2019.
https://scholarworks.rit.edu/theses/10000.
MLA Handbook (7th Edition):
Clark, K Jeselle. “Simulating Pathway-Based Steady States to Prevent Epithelial- Mesenchymal Transition in Ovarian Cancer.” 2019. Web. 19 Oct 2019.
Vancouver:
Clark KJ. Simulating Pathway-Based Steady States to Prevent Epithelial- Mesenchymal Transition in Ovarian Cancer. [Internet] [Masters thesis]. Rochester Institute of Technology; 2019. [cited 2019 Oct 19].
Available from: https://scholarworks.rit.edu/theses/10000.
Council of Science Editors:
Clark KJ. Simulating Pathway-Based Steady States to Prevent Epithelial- Mesenchymal Transition in Ovarian Cancer. [Masters Thesis]. Rochester Institute of Technology; 2019. Available from: https://scholarworks.rit.edu/theses/10000
University of Cincinnati
16.
Nordbeck, Patric C.
Dynamics of Affordance Actualization.
Degree: MA, Arts and Sciences: Psychology, 2017, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504881864634251
► The actualization of action possibilities (or affordances) can often be accomplished in numerous, equifinal ways. For instance, an individual could walk over to a rubbish…
(more)
▼ The actualization of action possibilities (or
affordances) can often be accomplished in numerous, equifinal ways.
For instance, an individual could walk over to a rubbish bin to
drop an item in or throw the piece of rubbish into the bin from
some distance away. The aim of the current study was to investigate
the behavioral dynamics arising from such metastable task-spaces
using a ball-to-bin transportation task. Participants were
instructed to transport balls from a starting area to a bin located
9 meters away. Time interval between the sequential presentation of
52 balls was manipulated as a control parameter and was expected to
push participants through different behavioral modes (i.e. the
degree to which participants modulated the distance moved prior to
throwing or dropping the ball into the target bin). As expected,
the results revealed a large degree of within and between
participant variability in task actualization. To better understand
how this behavioral variability emerged as a function of task
constraints, a two-parameter task manifold was devised using the
Cusp Catastrophe Model. Simulations demonstrated that this two
parameter state manifold can not only effectively capture the wide
range of participant behaviors observed, but also explains how
these behaviors are an emergent consequence of under-constrained
task goals.
Advisors/Committee Members: Chemero, Anthony (Committee Chair).
Subjects/Keywords: Psychology; affordances; dynamic systems; cusp catastrophe; dynamic modeling; simulations; constraints
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APA (6th Edition):
Nordbeck, P. C. (2017). Dynamics of Affordance Actualization. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504881864634251
Chicago Manual of Style (16th Edition):
Nordbeck, Patric C. “Dynamics of Affordance Actualization.” 2017. Masters Thesis, University of Cincinnati. Accessed October 19, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504881864634251.
MLA Handbook (7th Edition):
Nordbeck, Patric C. “Dynamics of Affordance Actualization.” 2017. Web. 19 Oct 2019.
Vancouver:
Nordbeck PC. Dynamics of Affordance Actualization. [Internet] [Masters thesis]. University of Cincinnati; 2017. [cited 2019 Oct 19].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504881864634251.
Council of Science Editors:
Nordbeck PC. Dynamics of Affordance Actualization. [Masters Thesis]. University of Cincinnati; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504881864634251
Vanderbilt University
17.
Koval, Andriy Volodymyrovych.
A Graphical System for Longitudinal Modeling using Dynamic Documents: Application to NLSY97 Religiosity Data.
Degree: PhD, Psychology, 2014, Vanderbilt University
URL: http://etd.library.vanderbilt.edu/available/etd-07302014-134645/
;
► This dissertation proposes a graphical analysis and presentation system for fitting, evaluating, and reporting longitudinal models in social sciences. The graphical innovations demonstrated here address…
(more)
▼ This dissertation proposes a graphical analysis and presentation system for fitting, evaluating, and reporting longitudinal models in social sciences. The graphical innovations demonstrated here address practical issues that arise in evaluating sequences of statistical models. A progression of nested or otherwise related models in a sequence creates a context for model comparisons. The proposed graphical methods provide the researcher with visualization tools to facilitate model evaluation, using data mapping and interactive document design. The study applies these methods to examine empirical trends of religious involvement using a nationally representative household sample of American youth, the National Longitudinal Survey of Youth, 1997 (NLSY97). Annual measures in the NLSY97 from 2000 to 2011 provided panel data on church attendance from approximately 9,000 individuals born between 1980 and 1984. These data are examined using latent curve models (LCM) to study the nature of change in religious involvement between ages 13 and 31. Data, code, and reproducibility instructions for this study are published as a GitHub repository and are available to the research community. PLEASE NOTE: the appendix.rar file is a compressed file, requiring a program to uncompress it once it has been downloaded onto your computer.
Advisors/Committee Members: Kristopher J. Preacher (committee member), Gary T. Henry (committee member), Joseph L. Rodgers (chair), James H. Steiger (committee member).
Subjects/Keywords: religiosity; latent curve modeling; longitudinal modeling; dynamic documents; NLSY97
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APA (6th Edition):
Koval, A. V. (2014). A Graphical System for Longitudinal Modeling using Dynamic Documents: Application to NLSY97 Religiosity Data. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://etd.library.vanderbilt.edu/available/etd-07302014-134645/ ;
Chicago Manual of Style (16th Edition):
Koval, Andriy Volodymyrovych. “A Graphical System for Longitudinal Modeling using Dynamic Documents: Application to NLSY97 Religiosity Data.” 2014. Doctoral Dissertation, Vanderbilt University. Accessed October 19, 2019.
http://etd.library.vanderbilt.edu/available/etd-07302014-134645/ ;.
MLA Handbook (7th Edition):
Koval, Andriy Volodymyrovych. “A Graphical System for Longitudinal Modeling using Dynamic Documents: Application to NLSY97 Religiosity Data.” 2014. Web. 19 Oct 2019.
Vancouver:
Koval AV. A Graphical System for Longitudinal Modeling using Dynamic Documents: Application to NLSY97 Religiosity Data. [Internet] [Doctoral dissertation]. Vanderbilt University; 2014. [cited 2019 Oct 19].
Available from: http://etd.library.vanderbilt.edu/available/etd-07302014-134645/ ;.
Council of Science Editors:
Koval AV. A Graphical System for Longitudinal Modeling using Dynamic Documents: Application to NLSY97 Religiosity Data. [Doctoral Dissertation]. Vanderbilt University; 2014. Available from: http://etd.library.vanderbilt.edu/available/etd-07302014-134645/ ;
University of Illinois – Urbana-Champaign
18.
Johnson, Brian B.
A Unified Technique for Dynamic Modeling and Stability Analysis of Microgrid Systems.
Degree: MS, 1200, 2010, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/14620
► This work presents a unified method for dynamic modeling and stability analysis of microgrid power systems. Using the automated state-model generation algorithm, a state-space model…
(more)
▼ This work presents a unified method for
dynamic modeling and stability analysis of microgrid power systems. Using the automated state-model generation algorithm, a state-space model of the microgrid power system is derived. The model may be used to conduct time-domain simulations and analyze system response to large transients. Additionally, eigenvalues of the system may be analyzed with respect to inverter control gains to assess small-signal stability. The proposed methodology is verified for large-signal transient study and small-signal stability analysis using dual and single-inverter microgrid systems, respectively. The presented method is general and may be applied to any three-phase circuit topology and inverter control without the need to derive circuit state equations.
Advisors/Committee Members: Chapman, Patrick L. (advisor), Chapman, Patrick L. (Committee Chair).
Subjects/Keywords: microgrid; microgrids; power; stability; dynamic modeling; modeling; distributed generation
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APA (6th Edition):
Johnson, B. B. (2010). A Unified Technique for Dynamic Modeling and Stability Analysis of Microgrid Systems. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/14620
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):
Johnson, Brian B. “A Unified Technique for Dynamic Modeling and Stability Analysis of Microgrid Systems.” 2010. Thesis, University of Illinois – Urbana-Champaign. Accessed October 19, 2019.
http://hdl.handle.net/2142/14620.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Johnson, Brian B. “A Unified Technique for Dynamic Modeling and Stability Analysis of Microgrid Systems.” 2010. Web. 19 Oct 2019.
Vancouver:
Johnson BB. A Unified Technique for Dynamic Modeling and Stability Analysis of Microgrid Systems. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2010. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/2142/14620.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Johnson BB. A Unified Technique for Dynamic Modeling and Stability Analysis of Microgrid Systems. [Thesis]. University of Illinois – Urbana-Champaign; 2010. Available from: http://hdl.handle.net/2142/14620
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Southern California
19.
Abdul Ghaffar, Alia Farhana.
The development of a mathematical model of a hybrid
airship.
Degree: MS, Aerospace Engineering, 2012, University of Southern California
URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/115998/rec/6549
► The mathematical model of a winged hybrid airship is developed for the analysis of its dynamic stability characteristics. A full nonlinear equation of motion that…
(more)
▼ The mathematical model of a winged hybrid airship is
developed for the analysis of its
dynamic stability
characteristics. A full nonlinear equation of motion that describes
the dynamics of the hybrid airship is determined and for
completeness, some of the components in the equations are estimated
using the appropriate methods that has been established and used in
the past. Adequate assumptions are made in order to apply any
relevant computation and estimation methods. While this hybrid
airship design is unique, its
modeling and stability analysis were
done according to the typical procedure of conventional airships
and aircrafts. All computations pertaining to the hybrid airship’s
equation of motion are carried out and any issues related to the
integration of the wing to the conventional airship design are
discussed in this thesis. The design of the hybrid airship is also
slightly modified to suit the demanding requirement of a complete
and feasible mathematical model. Then, linearization is performed
under a chosen trim condition, and eigenvalue analysis is carried
out to determine the general
dynamic stability characteristics of
the winged hybrid airship. The result shows that the winged hybrid
airship possesses
dynamic instability in longitudinal pitch motion
and lateral-directional slow roll motion. This is due to the strong
coupling between the aerostatic lift from the buoyant gas and
aerodynamic lift from the wing.
Advisors/Committee Members: Lockenour, Jerry (Committee Chair), Flashner, Henryk (Committee Member), Gruntman, Michael (Committee Member).
Subjects/Keywords: hybrid airship; equation of motion; airship; winged airship; dynamic stability analysis; dynamic modeling
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APA (6th Edition):
Abdul Ghaffar, A. F. (2012). The development of a mathematical model of a hybrid
airship. (Masters Thesis). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/115998/rec/6549
Chicago Manual of Style (16th Edition):
Abdul Ghaffar, Alia Farhana. “The development of a mathematical model of a hybrid
airship.” 2012. Masters Thesis, University of Southern California. Accessed October 19, 2019.
http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/115998/rec/6549.
MLA Handbook (7th Edition):
Abdul Ghaffar, Alia Farhana. “The development of a mathematical model of a hybrid
airship.” 2012. Web. 19 Oct 2019.
Vancouver:
Abdul Ghaffar AF. The development of a mathematical model of a hybrid
airship. [Internet] [Masters thesis]. University of Southern California; 2012. [cited 2019 Oct 19].
Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/115998/rec/6549.
Council of Science Editors:
Abdul Ghaffar AF. The development of a mathematical model of a hybrid
airship. [Masters Thesis]. University of Southern California; 2012. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/115998/rec/6549
Delft University of Technology
20.
Simplicio, P.
Helicopter nonlinear flight control: An acceleration measurements-based approach using incremental nonlinear dynamic inversion:.
Degree: 2011, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:d2ffe4d1-219e-4965-a6b4-debb900ded4c
► Due to the inherent instabilities and nonlinearities of rotorcraft dynamics, its changing properties during flight and the difficulties to predict its aerodynamics with high levels…
(more)
▼ Due to the inherent instabilities and nonlinearities of rotorcraft dynamics, its changing properties during flight and the difficulties to predict its aerodynamics with high levels of fidelity, helicopter flight control requires strategies that allow to cope with the nonlinearities of the model and assure robustness in the presence of inaccuracies and changes in configuration. The control laws developed in the last years normally concern a complex architecture based on an approximate model inversion, with a robust control synthesis or adaptive elements to compensate for the inversion error.
In this thesis, a novel approach based on an incremental model inversion is applied to simplify the design of helicopter flight controllers. With the adopted strategy, by employing the feedback of acceleration measurements to avoid the need for information relative to aerodynamic changes in the rotorcraft, the controller does not need any model data that depends exclusively on the states of the system, thus enhancing its robustness to model uncertainties and disturbances. The control system is composed of a three time scale separated loops architecture that allows to provide navigational control of the vehicle.
The overall system is tested by simulating several maneuvers with distinct agility levels commonly used for flying qualities analysis and an efficient tracking of the commanded references is achieved. Furthermore, with the robustness properties verified within the range of inaccuracies expected to be found in reality, the suggested method seems to be eligible for a potential practical implementation, even if only a simplified model of the vehicle is available.
Advisors/Committee Members: Chu, Q.P., Pavel, M.D..
Subjects/Keywords: helicopter modeling; helicopter flight control; nonlinear dynamic inversion; incremental nonlinear dynamic inversion; pseudo-control hedging
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APA (6th Edition):
Simplicio, P. (2011). Helicopter nonlinear flight control: An acceleration measurements-based approach using incremental nonlinear dynamic inversion:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d2ffe4d1-219e-4965-a6b4-debb900ded4c
Chicago Manual of Style (16th Edition):
Simplicio, P. “Helicopter nonlinear flight control: An acceleration measurements-based approach using incremental nonlinear dynamic inversion:.” 2011. Masters Thesis, Delft University of Technology. Accessed October 19, 2019.
http://resolver.tudelft.nl/uuid:d2ffe4d1-219e-4965-a6b4-debb900ded4c.
MLA Handbook (7th Edition):
Simplicio, P. “Helicopter nonlinear flight control: An acceleration measurements-based approach using incremental nonlinear dynamic inversion:.” 2011. Web. 19 Oct 2019.
Vancouver:
Simplicio P. Helicopter nonlinear flight control: An acceleration measurements-based approach using incremental nonlinear dynamic inversion:. [Internet] [Masters thesis]. Delft University of Technology; 2011. [cited 2019 Oct 19].
Available from: http://resolver.tudelft.nl/uuid:d2ffe4d1-219e-4965-a6b4-debb900ded4c.
Council of Science Editors:
Simplicio P. Helicopter nonlinear flight control: An acceleration measurements-based approach using incremental nonlinear dynamic inversion:. [Masters Thesis]. Delft University of Technology; 2011. Available from: http://resolver.tudelft.nl/uuid:d2ffe4d1-219e-4965-a6b4-debb900ded4c
University of Manitoba
21.
Daryabak, Mehdi.
Modeling line-commutated converter HVDC transmission systems using dynamic phasors.
Degree: Electrical and Computer Engineering, 2014, University of Manitoba
URL: http://hdl.handle.net/1993/31632
► This thesis develops the dynamic phasor model of a line-commutated converter (LCC) high-voltage direct current (HVDC) transmission system. The mathematical definition and properties of dynamic…
(more)
▼ This thesis develops the
dynamic phasor model of a line-commutated converter (LCC) high-voltage direct current (HVDC) transmission system. The mathematical definition and properties of
dynamic phasors are utilized to model both the dc-side and the ac-side of a LCC-HVDC transmission system as well as 6-pulse Graetz bridge, which is the building block of such a system.
The developed model includes low-frequency dynamics of the systems, i.e., fundamental frequency component (50 Hz) at the ac-side and dc component at the dc-side, and removes high-frequency transients. The developed model, however, is capable of accommodating higher harmonics if necessary. The model is also able to simulate the system during abnormal modes of operations such as unbalanced operation and commutation failure. In order to develop the
dynamic phasor model of a line-commutated converter, the concept of switching functions is utilized.
The developed model is capable of capturing large-signal transients of the system as well as steady state operating conditions. The model can be used in order to decrease the computational intensity of LCC-HVDC simulations. The developed model in this thesis enables the user to consider each harmonic component individually; this selective view of the components of the system response is not possible to achieve in conventional electromagnetic transient simulations.
Advisors/Committee Members: Filizadeh, Shaahin (Electrical and Computer Engineering) (supervisor), Gole, Aniruddha (Electrical and Computer Engineering).
Subjects/Keywords: Dynamic average modeling; Dynamic phasors; EMT simulation; line commutated converter (LCC) HVDC
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APA (6th Edition):
Daryabak, M. (2014). Modeling line-commutated converter HVDC transmission systems using dynamic phasors. (Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/31632
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):
Daryabak, Mehdi. “Modeling line-commutated converter HVDC transmission systems using dynamic phasors.” 2014. Thesis, University of Manitoba. Accessed October 19, 2019.
http://hdl.handle.net/1993/31632.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Daryabak, Mehdi. “Modeling line-commutated converter HVDC transmission systems using dynamic phasors.” 2014. Web. 19 Oct 2019.
Vancouver:
Daryabak M. Modeling line-commutated converter HVDC transmission systems using dynamic phasors. [Internet] [Thesis]. University of Manitoba; 2014. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/1993/31632.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Daryabak M. Modeling line-commutated converter HVDC transmission systems using dynamic phasors. [Thesis]. University of Manitoba; 2014. Available from: http://hdl.handle.net/1993/31632
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Tech
22.
Li, Bo.
Modeling and Runtime Systems for Coordinated Power-Performance Management.
Degree: PhD, Computer Science, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/87064
► Emergent systems in high-performance computing (HPC) expect maximal efficiency to achieve the goal of power budget under 20-40 megawatts for 1 exaflop set by the…
(more)
▼ Emergent systems in high-performance computing (HPC) expect maximal
efficiency to achieve the goal of power budget under 20-40
megawatts for 1 exaflop set by the Department of Energy.
To optimize efficiency, emergent systems
provide multiple power-performance control techniques to
throttle different system components and scale of concurrency.
In this dissertation, we focus on three throttling techniques:
CPU
dynamic voltage and frequency scaling (DVFS),
dynamic memory
throttling (DMT), and
dynamic concurrency throttling (DCT). We first conduct an
empirical analysis of the performance and energy trade-offs of
different architectures under the throttling techniques. We
show the impact on performance and energy consumption on Intel
x86 systems with accelerators of Intel Xeon Phi and a Nvidia
general-purpose graphics processing unit (GPGPU).
We show the trade-offs and potentials for improving efficiency.
Furthermore, we propose a parallel performance model for coordinating
DVFS, DMT, and DCT simultaneously. We present a multivariate
linear regression-based approach to approximate the impact of
DVFS, DMT, and DCT on performance for performance prediction.
Validation using 19 HPC applications/kernels on
two architectures (i.e., Intel x86 and IBM BG/Q)
shows up to 7% and 17% prediction
error correspondingly. Thereafter, we develop the metrics for
capturing the performance impact of DVFS, DMT, and DCT.
We apply the artificial neural network model to approximate
the nonlinear effects on performance impact and present
a runtime control strategy accordingly for power capping.
Our validation using
37 HPC applications/kernels shows up to a 20% performance
improvement under a given power budget compared with the Intel
RAPL-based method.
Advisors/Committee Members: Cameron, Kirk W. (committeechair), Butt, Ali (committee member), Lee, Dongyoon (committee member), Leon, Edgar A. (committee member), Back, Godmar Volker (committee member).
Subjects/Keywords: Parallel Performance Modeling; Dynamic Voltage and Frequency Scaling; Dynamic Memory Throttling; Dynamic Concurrency Throttling; Shared-Memory Systems
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Manager
APA (6th Edition):
Li, B. (2019). Modeling and Runtime Systems for Coordinated Power-Performance Management. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/87064
Chicago Manual of Style (16th Edition):
Li, Bo. “Modeling and Runtime Systems for Coordinated Power-Performance Management.” 2019. Doctoral Dissertation, Virginia Tech. Accessed October 19, 2019.
http://hdl.handle.net/10919/87064.
MLA Handbook (7th Edition):
Li, Bo. “Modeling and Runtime Systems for Coordinated Power-Performance Management.” 2019. Web. 19 Oct 2019.
Vancouver:
Li B. Modeling and Runtime Systems for Coordinated Power-Performance Management. [Internet] [Doctoral dissertation]. Virginia Tech; 2019. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/10919/87064.
Council of Science Editors:
Li B. Modeling and Runtime Systems for Coordinated Power-Performance Management. [Doctoral Dissertation]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/87064
University of Edinburgh
23.
Zhang, Jiaqi.
Holdout transshipment policy in two-location inventory systems.
Degree: 2009, University of Edinburgh
URL: http://hdl.handle.net/1842/4353
► In two-location inventory systems, unidirectional transshipment policies are considered when an item is not routinely stocked at a location in the system. Unlike the past…
(more)
▼ In two-location inventory systems, unidirectional transshipment policies are considered when an item is not routinely stocked at a location in the system. Unlike the past research in this area which has concentrated on the simple transshipment policies of complete pooling or no pooling, the research presented in this thesis endeavors to develop an understanding of a more general class of transshipment policy. The research considers two major approaches: a decomposition approach, in which the two-location system is decomposed into a system with independent locations, and Markov decision process approach. For the decomposition approach, the transshipment policy is restricted to the class of holdout transshipment policy. The first attempt to develop a decomposition approach assumes that transshipment between the locations occurs at a constant rate in order to decompose the system into two independent locations with constant demand rates. The second attempt modifies the assumption of constant rate of transshipment to take account of local inventory levels to decompose the system into two independent locations with non-constant demand rates. In the final attempt, the assumption of constant rate of transshipment is further modified to model more closely the location providing transshipments. Again the system is decomposed into two independent locations with non-constant demand rates. For each attempt, standard techniques are applied to derive explicit expressions for the average cost rate, and an iterative solution method is developed to find an optimal holdout transshipment policy. Computational results show that these approaches can provide some insights into the performance of the original system. A semi-Markov decision model of the system is developed under the assumption of exponential lead time rather than fixed lead time. This model is later extended to the case of phase-type distribution for lead time. The semi-Markov decision process allows more general transshipment policies, but is computationally more demanding. Implicit expressions for the average cost rate are derived from the optimality equation for dynamic programming models. Computational results illustrate insights into the management of the two-location system that can be gained from this approach.
Subjects/Keywords: 338.6041; Inventory control management system; lateral transshipment policy; stochastic modeling; dynamic programming; simulation modeling
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APA (6th Edition):
Zhang, J. (2009). Holdout transshipment policy in two-location inventory systems. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/4353
Chicago Manual of Style (16th Edition):
Zhang, Jiaqi. “Holdout transshipment policy in two-location inventory systems.” 2009. Doctoral Dissertation, University of Edinburgh. Accessed October 19, 2019.
http://hdl.handle.net/1842/4353.
MLA Handbook (7th Edition):
Zhang, Jiaqi. “Holdout transshipment policy in two-location inventory systems.” 2009. Web. 19 Oct 2019.
Vancouver:
Zhang J. Holdout transshipment policy in two-location inventory systems. [Internet] [Doctoral dissertation]. University of Edinburgh; 2009. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/1842/4353.
Council of Science Editors:
Zhang J. Holdout transshipment policy in two-location inventory systems. [Doctoral Dissertation]. University of Edinburgh; 2009. Available from: http://hdl.handle.net/1842/4353
Penn State University
24.
Islam, Mohammad Mazharul.
Metabolic modeling of microbial communities.
Degree: MS, Chemical Engineering, 2014, Penn State University
URL: https://etda.libraries.psu.edu/catalog/20510
► Most microbial communities change with time in response to changes and/or perturbations in environmental conditions. The temporal variations in inter-species metabolic interactions within these communities…
(more)
▼ Most microbial communities change with time in
response to changes and/or perturbations in environmental
conditions. The temporal variations in inter-species metabolic
interactions within these communities can significantly affect
their structure and function. Here, I introduce d-OptCom, an
extension of the OptCom procedure, for the dynamic metabolic
modeling of microbial communities. It enables capturing the
temporal dynamics of biomass concentration of the community members
and extracellular concentration of the shared metabolites, while
integrating species- and community-level fitness functions. The
applicability of d-OptCom was demonstrated by modeling the dynamic
co-growth of a number of auxotrophic mutant pairs of E. coli and by
computationally assessing the dynamics and composition of a
uranium-reducing community comprised of Geobacter sulfurreducens,
Rhodoferax ferireducens and Shewanella oneidensis. d-OptCom was
also employed to examine the impact of lactate vs. acetate addition
on the relative abundance of uranium reducing species. These
studies highlight the importance of simultaneously accounting for
both species- and community-level fitness functions when modeling
microbial communities and demonstrate that the incorporation of
uptake kinetic information can substantially improve the prediction
of inter-species flux trafficking. Overall, this study paves the
way for the dynamic multi-objective analysis of microbial
ecosystems.
Subjects/Keywords: dynamic; microbial communities; modeling; d-OptCom;
Uranium reduction; Auxotrophic mutants. metabolic
modeling
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APA (6th Edition):
Islam, M. M. (2014). Metabolic modeling of microbial communities. (Masters Thesis). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/20510
Chicago Manual of Style (16th Edition):
Islam, Mohammad Mazharul. “Metabolic modeling of microbial communities.” 2014. Masters Thesis, Penn State University. Accessed October 19, 2019.
https://etda.libraries.psu.edu/catalog/20510.
MLA Handbook (7th Edition):
Islam, Mohammad Mazharul. “Metabolic modeling of microbial communities.” 2014. Web. 19 Oct 2019.
Vancouver:
Islam MM. Metabolic modeling of microbial communities. [Internet] [Masters thesis]. Penn State University; 2014. [cited 2019 Oct 19].
Available from: https://etda.libraries.psu.edu/catalog/20510.
Council of Science Editors:
Islam MM. Metabolic modeling of microbial communities. [Masters Thesis]. Penn State University; 2014. Available from: https://etda.libraries.psu.edu/catalog/20510
The Ohio State University
25.
Maurer, Julie Ann.
Three Essays: Hybrid Model Based Analysis of the Science
Workforce.
Degree: PhD, EDU Physical Activity and Educational
Services, 2018, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1543498036220193
► Workforce related issues in the Science, Technology, Engineering and Mathematics (STEM) fields are of great importance and have been the subject of many research studies.…
(more)
▼ Workforce related issues in the Science, Technology,
Engineering and Mathematics (STEM) fields are of great importance
and have been the
subject of many research studies. Academic
research is essential to a country’s ability to remain competitive
in the global economy. Furthermore, the future economic strength of
the United States is reliant on having a productive and
well-prepared scientific workforce. Although behavioral and social
science research (BSSR) is known to play a vital role in addressing
health, security, and other complex challenges facing the country,
most existing STEM workforce research does not consider BSS
disciplines. Therefore, this dissertation explores academic BSSR
workforce supply and demand dynamics, including various factors
that influence its stability and size, by developing a simulation
model framework.This research considers academic science workforce
system behaviors attributable to individual level factors that
influence career decisions and the eventual outcomes associated
with them. Traditional labor market economics studies are based on
linear estimations that do not capture the complexity associated
with the overall system, including macroeconomic contexts at the
regional level and individual level heterogeneity. However, other
recent studies have successfully used system dynamics models to
understand some of the less intuitive workforce system behaviors,
such as feedback loops, though they use aggregate level factors.
Thus, individual level heterogeneity has not been well represented
in past academic research workforce supply and demand studies. This
dissertation contributes to existing knowledge by investigating the
distribution and attributes of BSS researchers employed in the
academic workforce in the context of their
dynamic interactions
with top research universities. The primary research question is
how does the relationship between individual BSS researcher
characteristics and R1 universities’ hiring decisions combine to
influence overall workforce outcomes in the context of regional
dynamics? The supply dynamics of the workforce system are simulated
using an agent based model (ABM) that allows consideration of
researchers’ individual level attributes and behaviors. In the ABM,
graduates who choose to enter the academic workforce have three
career options, including applying for an academic job, pursuing
non-academic jobs in government or industry, or remaining
unemployed. The use of ABM allows job seekers to develop emergent
behaviors while also considering the hiring preferences of
employers. Agents’ workforce outcomes are also simulated within the
context of national and regional macroeconomics represented by a
system dynamics (SD) model used to simulate the demand dynamics.
The resulting model framework is used to consider the effect of
policies designed to address the gender pay gap, and to consider
how fluctuations in federal funding of academic science research
impact system outcomes.The demographic characteristics of the BSS
students and researchers initially…
Advisors/Committee Members: Hawley, Joshua (Advisor).
Subjects/Keywords: Education; workforce, academic science, dynamic modeling, labor
market supply, labor market demand, policy modeling
Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Maurer, J. A. (2018). Three Essays: Hybrid Model Based Analysis of the Science
Workforce. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1543498036220193
Chicago Manual of Style (16th Edition):
Maurer, Julie Ann. “Three Essays: Hybrid Model Based Analysis of the Science
Workforce.” 2018. Doctoral Dissertation, The Ohio State University. Accessed October 19, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1543498036220193.
MLA Handbook (7th Edition):
Maurer, Julie Ann. “Three Essays: Hybrid Model Based Analysis of the Science
Workforce.” 2018. Web. 19 Oct 2019.
Vancouver:
Maurer JA. Three Essays: Hybrid Model Based Analysis of the Science
Workforce. [Internet] [Doctoral dissertation]. The Ohio State University; 2018. [cited 2019 Oct 19].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1543498036220193.
Council of Science Editors:
Maurer JA. Three Essays: Hybrid Model Based Analysis of the Science
Workforce. [Doctoral Dissertation]. The Ohio State University; 2018. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1543498036220193
26.
Dawson, Scott Thomas McGregor.
Reduced-order modeling of fluids systems, with applications in unsteady aerodynamics
.
Degree: PhD, 2017, Princeton University
URL: http://arks.princeton.edu/ark:/88435/dsp01p2676z051
► This thesis focuses on two major themes: modeling and understanding the dynamics of rapidly pitching airfoils, and developing methods that can be used to extract…
(more)
▼ This thesis focuses on two major themes:
modeling and understanding the dynamics of rapidly pitching airfoils, and developing methods that can be used to extract models and pertinent features from datasets obtained in the study of these and other systems in fluid mechanics and aerodynamics. Much of the work utilizes in some capacity
dynamic mode decomposition (DMD), a recently developed method to extract dynamical features and models from data.
The investigation of pitching airfoils includes both wind tunnel experiments and direct numerical simulations. Experiments are performed on a NACA 0012 airfoil undergoing rapid pitching motion, with the focus on developing a switched linear
modeling framework that can accurately predict unsteady aerodynamic forces and pressure distributions throughout arbitrary pitching motions.
Numerical simulations are used to study the behavior of sinusoidally pitching airfoils. By systematically varying the amplitude, frequency, mean angle and axis of pitching, a comprehensive database of results is acquired, from which interesting regions in parameter space are identified and studied. Attention is given to pitching at "preferred" frequencies, where vortex shedding in the wake is excited or amplified, leading to larger lift forces.
More generally, the ability to extract nonlinear models that describe the behavior of complex fluids systems can assist in not only understanding the dominant features of such systems, but also to achieve accurate prediction and control. One potential avenue to achieve this objective is through numerical approximation of the Koopman operator, an infinite-dimensional linear operator capable of describing finite-dimensional nonlinear systems, such as those that might describe the dominant dynamics of fluids systems. This idea is explored by showing that algorithms designed to approximate the Koopman operator can indeed be utilized to accurately model nonlinear fluids systems, even when the data available is limited or noisy.
Data-driven algorithms can be adversely affected by noisy data. Focusing on DMD, it is shown analytically that the algorithm is biased to sensor noise, which explains a previously observed sensitivity to noisy data. Using this finding, a number of modifications to DMD are proposed, which all give better approximations of the true dynamics using noise-corrupted data.
Advisors/Committee Members: Rowley, Clarence W (advisor).
Subjects/Keywords: Data-driven modeling;
Dynamic mode decomposition;
Fluid mechanics;
Reduced-order modeling;
System identification;
Unsteady aerodynamics
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dawson, S. T. M. (2017). Reduced-order modeling of fluids systems, with applications in unsteady aerodynamics
. (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp01p2676z051
Chicago Manual of Style (16th Edition):
Dawson, Scott Thomas McGregor. “Reduced-order modeling of fluids systems, with applications in unsteady aerodynamics
.” 2017. Doctoral Dissertation, Princeton University. Accessed October 19, 2019.
http://arks.princeton.edu/ark:/88435/dsp01p2676z051.
MLA Handbook (7th Edition):
Dawson, Scott Thomas McGregor. “Reduced-order modeling of fluids systems, with applications in unsteady aerodynamics
.” 2017. Web. 19 Oct 2019.
Vancouver:
Dawson STM. Reduced-order modeling of fluids systems, with applications in unsteady aerodynamics
. [Internet] [Doctoral dissertation]. Princeton University; 2017. [cited 2019 Oct 19].
Available from: http://arks.princeton.edu/ark:/88435/dsp01p2676z051.
Council of Science Editors:
Dawson STM. Reduced-order modeling of fluids systems, with applications in unsteady aerodynamics
. [Doctoral Dissertation]. Princeton University; 2017. Available from: http://arks.princeton.edu/ark:/88435/dsp01p2676z051
University of Ontario Institute of Technology
27.
Razzaq, Muhammad Rashid.
Reliability analysis of smart electrical transmission system and reliability modeling through dynamic flowgraph methodology.
Degree: 2011, University of Ontario Institute of Technology
URL: http://hdl.handle.net/10155/252
► Reliability assessment methods allow the evaluation of the reliability of systems and provide important information on how to improve a system???s life to reduce risk…
(more)
▼ Reliability assessment methods allow the evaluation of the reliability of systems and provide important information on how to improve a system???s life to reduce risk and hazards. With the advancement in technology, the existing methods were extended and new methods were adopted. The advancement from mechanical to numerical and analog to digital system in many applications, and deregulation of energy sector brought the need to further modify the reliability analysis methods. The scope of this research is to demonstrate the advancement of the
Dynamic Flowgraph Methodology (DFM) to reliability
modeling of Smart Electrical Transmission System. The reason behind this is the successful operation of electric power under a deregulated electricity market depends on transmission system reliability management. Besides this, analog electro-mechanical systems in existing power system are aging and becoming obsolete. This thesis also illustrates how the electrical transmission system can be renovated into smart electrical transmission system and evaluates the reliability measures.
Advisors/Committee Members: Lu, Lixuan.
Subjects/Keywords: Dynamic flowgraph methodology; Smart electrical transmission system; Reliability modeling
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Manager
APA (6th Edition):
Razzaq, M. R. (2011). Reliability analysis of smart electrical transmission system and reliability modeling through dynamic flowgraph methodology. (Thesis). University of Ontario Institute of Technology. Retrieved from http://hdl.handle.net/10155/252
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):
Razzaq, Muhammad Rashid. “Reliability analysis of smart electrical transmission system and reliability modeling through dynamic flowgraph methodology.” 2011. Thesis, University of Ontario Institute of Technology. Accessed October 19, 2019.
http://hdl.handle.net/10155/252.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Razzaq, Muhammad Rashid. “Reliability analysis of smart electrical transmission system and reliability modeling through dynamic flowgraph methodology.” 2011. Web. 19 Oct 2019.
Vancouver:
Razzaq MR. Reliability analysis of smart electrical transmission system and reliability modeling through dynamic flowgraph methodology. [Internet] [Thesis]. University of Ontario Institute of Technology; 2011. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/10155/252.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Razzaq MR. Reliability analysis of smart electrical transmission system and reliability modeling through dynamic flowgraph methodology. [Thesis]. University of Ontario Institute of Technology; 2011. Available from: http://hdl.handle.net/10155/252
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
28.
Almeida, Rynaldo Zanotele Hemerly de.
Modelagem dinâmica e controle de robô manipulador de arquitetura paralela assimétrica de três graus de liberdade.
Degree: PhD, Engenharia Mecânica de Projeto de Fabricação, 2013, University of São Paulo
URL: http://www.teses.usp.br/teses/disponiveis/3/3151/tde-19092014-113652/
;
► Este trabalho trata da modelagem dinâmica e do projeto de sistemas de controle para um robô manipulador de arquitetura paralela assimétrica de três graus de…
(more)
▼ Este trabalho trata da modelagem dinâmica e do projeto de sistemas de controle para um robô manipulador de arquitetura paralela assimétrica de três graus de liberdade, correspondente a três translações de seu efetuador no espaço tridimensional, concebido para tarefas de pega-e-põe (pick-and-place). Dentre os desenvolvimentos teóricos, procurou-se estender, para toda gama de robôs paralelos e topologicamente assimétricos, a abrangência dos procedimentos aplicados inicialmente a este caso específico. Foram empregados o Método de Lagrange e o Princípio dos Trabalhos Virtuais na obtenção de modelos dinâmicos baseados em hipóteses simplificadoras de corpos rígidos de massas concentradas e de massas distribuídas. Para o projeto de controladores, foram utilizadas as técnicas de torque computado e torque computado estendido. As formulações correspondentes a estas técnicas foram aprimoradas de forma a permitir o cálculo de esforços de controle de modo equivalente tanto nas coordenadas dos atuadores como nas coordenadas do efetuador e em conformidade com os requisitos de resposta dinâmica definidos para o robô. Tais requisitos podem ser inclusive anisotrópicos, o que se julga ser mais apropriado para robôs paralelos assimétricos. Particularmente em relação ao robô analisado, foram avaliados efeitos de simplificação do modelo dinâmico e da discretização do controlador (incluindo discretização com dupla frequência de amostragem) sobre os erros de controle de posição. Percebeu-se que os requisitos de alto desempenho das tarefas de pega-epõe levam o projeto do controlador ao limite de validade da hipótese simplificadora de corpo rígido e da capacidade de processamento do hardware de controle.
This work deals with the dynamic modeling and the design of control systems for an asymmetric parallel manipulator robot with three degrees of freedom, related to three translations of its end-effector in the tridimensional space, conceived for pick-andplace tasks. Among the theoretical developments, one of them was the extension of the proposed procedures, initially applied to this specific case, to the whole class of topologically asymmetric and parallel mechanisms. The Lagrange Method and the Principle of Virtual work were employed in order to build dynamic models based on rigid body assumption with either lumped or distributed mass simplification hypothesis. For the controllers design, computed torque and extended computed torque techniques were used. The formulations of such techniques were elaborated in order to allow the calculation of the control efforts to be executed equivalently both on the actuators coordinates and on the end-effector coordinates, in accordance with the dynamic response requirements defined for the robot. These requirements may be even anisotropic, what is considered to be more suitable for asymmetric parallel robots. Particularly about the analyzed robot, the effects of dynamic model simplification and controller discretization (including double sample rate discretization) on the position control errors were…
Advisors/Committee Members: Coelho, Tarcisio Antonio Hess.
Subjects/Keywords: Control nonlinear; Controle não linear; Dynamic modeling; Modelagem dinâmica; Robôs; Robots
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APA ·
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MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Almeida, R. Z. H. d. (2013). Modelagem dinâmica e controle de robô manipulador de arquitetura paralela assimétrica de três graus de liberdade. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/3/3151/tde-19092014-113652/ ;
Chicago Manual of Style (16th Edition):
Almeida, Rynaldo Zanotele Hemerly de. “Modelagem dinâmica e controle de robô manipulador de arquitetura paralela assimétrica de três graus de liberdade.” 2013. Doctoral Dissertation, University of São Paulo. Accessed October 19, 2019.
http://www.teses.usp.br/teses/disponiveis/3/3151/tde-19092014-113652/ ;.
MLA Handbook (7th Edition):
Almeida, Rynaldo Zanotele Hemerly de. “Modelagem dinâmica e controle de robô manipulador de arquitetura paralela assimétrica de três graus de liberdade.” 2013. Web. 19 Oct 2019.
Vancouver:
Almeida RZHd. Modelagem dinâmica e controle de robô manipulador de arquitetura paralela assimétrica de três graus de liberdade. [Internet] [Doctoral dissertation]. University of São Paulo; 2013. [cited 2019 Oct 19].
Available from: http://www.teses.usp.br/teses/disponiveis/3/3151/tde-19092014-113652/ ;.
Council of Science Editors:
Almeida RZHd. Modelagem dinâmica e controle de robô manipulador de arquitetura paralela assimétrica de três graus de liberdade. [Doctoral Dissertation]. University of São Paulo; 2013. Available from: http://www.teses.usp.br/teses/disponiveis/3/3151/tde-19092014-113652/ ;
Texas A&M University
29.
Kiselkova, Valeriya.
Effect of instabilities in the buoyancy-driven flow on the bottom oxygen: Applications to the Louisiana Shelf.
Degree: 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2797
► A combination of in situ sampling and numerical modeling was used to investigate the effects of mesoscale (<50 km) circulation patterns and stratification on the…
(more)
▼ A combination of in situ sampling and numerical
modeling was used to
investigate the effects of mesoscale (<50 km) circulation patterns and stratification on
the evolution of hypoxia on the Louisiana Shelf. Temperature, salinity, and dissolved
oxygen concentrations records reveal the presence of an alongshelf meander, which is
manifested vertically and horizontally as a wave-like distribution of the properties in the
water column. The observations suggest the meander is a ubiquitous characteristic of the
shelf with alongshore spatial scale approximately 50 km and less, which is consistent
with the locations of sandy shoals along the coast and the local deformation radius.
Twelve numerical experiments using an idealized three-dimensional shelf
circulation model were performed to evaluate the relative importance of the variable
bottom topography and freshwater forcing on the development, evolution, and scales of
the
dynamic instabilities. The inclusion of the shoals into the bottom topography showed
the development of the
dynamic instabilities as the flow passed over the shoals and
downstream. Introduction of fresh water onto the shelf resulted in greater salinity
differences, and, as a consequence in the formation of the dynamically unstable salinity
fronts along the plume edge. The combination of the freshwater forcing and shoaling
topography produced competing and complex interactions.
Six numerical experiments were analyzed in order to investigate the effect of
dynamic instabilities on spatial and temporal patterns of dissolved oxygen concentrations along the shelf. Although a linear relationship between Brunt-V?is?l?
frequency and dissolved oxygen deficit was expected, a nonlinear loop-like relationship
was discovered that reflects the response of biochemical properties to the alongshelf
variability of the density field. Comparison of the numerical
modeling runs to
observations of density and dissolved oxygen concentrations on the Louisiana Shelf
reinforces the importance of physical processes such as topographic steering and/or
freshwater forcing on the alongshore distribution of physical and biochemical properties.
It suggests that the time scales of respiration (~3 days) and buoyancy transfer processes
(~5-7 days), associated with the physical processes that are responsible for water column
stability and ventilation, are similar to the time scales associated with the benthic
respiration rates.
Advisors/Committee Members: DiMarco, Steven F. (advisor), Brooks, David (committee member), Edge, Billy L. (committee member), Hetland, Robert D. (committee member).
Subjects/Keywords: Dynamic instability; Hypoxia; Louisiana Shelf; Stratification; Numerical Modeling; Gulf of Mexico
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APA ·
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MLA ·
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Manager
APA (6th Edition):
Kiselkova, V. (2009). Effect of instabilities in the buoyancy-driven flow on the bottom oxygen: Applications to the Louisiana Shelf. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2797
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):
Kiselkova, Valeriya. “Effect of instabilities in the buoyancy-driven flow on the bottom oxygen: Applications to the Louisiana Shelf.” 2009. Thesis, Texas A&M University. Accessed October 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-2797.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kiselkova, Valeriya. “Effect of instabilities in the buoyancy-driven flow on the bottom oxygen: Applications to the Louisiana Shelf.” 2009. Web. 19 Oct 2019.
Vancouver:
Kiselkova V. Effect of instabilities in the buoyancy-driven flow on the bottom oxygen: Applications to the Louisiana Shelf. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2797.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kiselkova V. Effect of instabilities in the buoyancy-driven flow on the bottom oxygen: Applications to the Louisiana Shelf. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2797
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
30.
Aluko, Obanifemi.
DYNAMIC MODELING AND CONTROL OF REACTIVE DISTILLATION FOR HYDROGENATION OF BENZENE.
Degree: 2010, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2008-08-27
► This work presents a modeling and control study of a reactive distillation column used for hydrogenation of benzene. A steady state and a dynamic model…
(more)
▼ This work presents a
modeling and control study of a reactive distillation column
used for hydrogenation of benzene. A steady state and a
dynamic model have been
developed to investigate control structures for the column. The most important aspects of
this control problem are that the purity of the product streams regarding benzene need to
be met. At the same time as little toluene as possible should be converted. The former is a
constraint imposed by EPA regulations while the latter is tied to process economics due
to the high octane number of toluene. It is required to satisfy both of these objectives
even under the influence of disturbances, as the feed composition changes on a regular
basis. The
dynamic model is used for developing transfer function models of two
potential control structures. Pairing of inputs and outputs is performed based upon the
Relative Gain Array (RGA) and PI controllers were designed for each control structure.
The controller performance was then compared in simulation studies. From our results,
control structure 2 performed better than control structure 1. The main advantage of CS2
over CS1 is noticed in the simulation of feed composition disturbance rejection, where
CS2 returns all variables back to steady state within 3 hrs while it take CS1 more than 20
hrs to return the temperature variables back to steady state.
Advisors/Committee Members: Hahn, Juergen (advisor), Butenko, Sergiy (committee member), El-Halwagi, Mahmoud (committee member).
Subjects/Keywords: reactive distillation; dynamic modeling; RGA analysis; PI control; hydrogenation.
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Manager
APA (6th Edition):
Aluko, O. (2010). DYNAMIC MODELING AND CONTROL OF REACTIVE DISTILLATION FOR HYDROGENATION OF BENZENE. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2008-08-27
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):
Aluko, Obanifemi. “DYNAMIC MODELING AND CONTROL OF REACTIVE DISTILLATION FOR HYDROGENATION OF BENZENE.” 2010. Thesis, Texas A&M University. Accessed October 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-2008-08-27.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Aluko, Obanifemi. “DYNAMIC MODELING AND CONTROL OF REACTIVE DISTILLATION FOR HYDROGENATION OF BENZENE.” 2010. Web. 19 Oct 2019.
Vancouver:
Aluko O. DYNAMIC MODELING AND CONTROL OF REACTIVE DISTILLATION FOR HYDROGENATION OF BENZENE. [Internet] [Thesis]. Texas A&M University; 2010. [cited 2019 Oct 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2008-08-27.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Aluko O. DYNAMIC MODELING AND CONTROL OF REACTIVE DISTILLATION FOR HYDROGENATION OF BENZENE. [Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2008-08-27
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] [3] [4] [5] … [23] ▶
. 
Open Access Theses and Dissertations
