You searched for +publisher:"University of Texas – Austin" +contributor:("Longoria, Raul G.").
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University of Texas – Austin
1.
Yu, Sijie.
A cyber-physical system implementation for a hydro-pneumatic pulse forming network.
Degree: MSin Engineering, Mechanical Engineering, 2017, University of Texas – Austin
URL: http://hdl.handle.net/2152/47178 
► A hydro-pneumatic pulse forming network is an energy storage and conditioning system. It converts the highly variable power provided by renewable sources into a cyclical…
(more)
▼ A hydro-pneumatic pulse forming network is an energy storage and conditioning system. It converts the highly variable power provided by renewable sources into a cyclical form demanded by practical loads. In an affiliated project, a laboratory testbed has been developed for demonstrating the HPPFN. This thesis studies the implementation of a cyber-physical system architecture that monitors and controls the HPPFN to enhance its reliability and flexibility. The thesis explains the testbed design including assessment of the components and their characteristics. It also explains the physical system modeling and simulation design process, the functionalities of the model as well as the difficulties encountered during the modeling process. CPS implementation and its decision-making logics are then explained in detail and its performance is evaluated based on the successfulness of its design purpose realization. The evolution of CPS model design is included to provide a clear overview of the CPS performance improvements. Possible future works to improve the CPS implementation are also discussed in the thesis. With the implementation of CPS, the HPPFN can adjust its charging and discharging strategy according to varying input conditions and load requirements to ensure optimal and efficient operation. This research demonstrates one way for how CPS connects a physical system to users by allowing them to monitor and control a system using online simulation models. It provides a basis for a control solution to the HPPFN where other control theories are hard to apply.
Advisors/Committee Members: Longoria, Raul G. (advisor).
Subjects/Keywords: Energy; Pulse forming network; Cyber physical system; System control; System modeling; Hydraulic; Accumulators
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APA (6th Edition):
Yu, S. (2017). A cyber-physical system implementation for a hydro-pneumatic pulse forming network. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/47178
Chicago Manual of Style (16th Edition):
Yu, Sijie. “A cyber-physical system implementation for a hydro-pneumatic pulse forming network.” 2017. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/47178.
MLA Handbook (7th Edition):
Yu, Sijie. “A cyber-physical system implementation for a hydro-pneumatic pulse forming network.” 2017. Web. 13 Apr 2021.
Vancouver:
Yu S. A cyber-physical system implementation for a hydro-pneumatic pulse forming network. [Internet] [Masters thesis]. University of Texas – Austin; 2017. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/47178.
Council of Science Editors:
Yu S. A cyber-physical system implementation for a hydro-pneumatic pulse forming network. [Masters Thesis]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/47178
University of Texas – Austin
2.
-9360-728X.
Box pushing with a mobile robot using visual servoing.
Degree: MSin Engineering, Mechanical Engineering, 2019, University of Texas – Austin
URL: http://dx.doi.org/10.26153/tsw/3399
► Pushing is one of the many ways to manipulate an object and it is especially useful when the object is too big to be gripped…
(more)
▼ Pushing is one of the many ways to manipulate an object and it is especially useful when the object is too big to be gripped by the robot. Previous studies analyzed the problem of pushing polygonal objects into desired poses and proposed open loop pushing algorithms. In the absence of object pose feedback, to avoid slip in contact between the robot and the object, primitives for path planning were computed using conservative estimates for coefficient of friction between the robot and the object. In this work, we experimentally measured the coefficient of friction between the robot and object to compute path planning primitives. We used A* search and RRT* algorithms for path planning. We perform controlled pushing using object pose feedback obtained from a vision system using fiduciary markers. Pushing objects with object pose feedback enables us to confidently operate close to the frictional limits of the system, as the robot can take paths with tighter turns (smaller turning radius) to push the object into the goal pose.
Advisors/Committee Members: Longoria, Raul G. (advisor).
Subjects/Keywords: Mobile robot; Visual servoing; Pushing; Manipulation; Path planning; Localization; Friction
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APA (6th Edition):
-9360-728X. (2019). Box pushing with a mobile robot using visual servoing. (Masters Thesis). University of Texas – Austin. Retrieved from http://dx.doi.org/10.26153/tsw/3399
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-9360-728X. “Box pushing with a mobile robot using visual servoing.” 2019. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://dx.doi.org/10.26153/tsw/3399.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-9360-728X. “Box pushing with a mobile robot using visual servoing.” 2019. Web. 13 Apr 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-9360-728X. Box pushing with a mobile robot using visual servoing. [Internet] [Masters thesis]. University of Texas – Austin; 2019. [cited 2021 Apr 13].
Available from: http://dx.doi.org/10.26153/tsw/3399.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-9360-728X. Box pushing with a mobile robot using visual servoing. [Masters Thesis]. University of Texas – Austin; 2019. Available from: http://dx.doi.org/10.26153/tsw/3399
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
University of Texas – Austin
3.
-7389-5998.
Model-based fault detection and diagnosis of BLDC motors working at variable speed using wavelet transform.
Degree: MSin Engineering, Mechanical Engineering, 2019, University of Texas – Austin
URL: http://dx.doi.org/10.26153/tsw/3181
► Predictive Maintenance is becoming increasingly important in the automated industry, as maintaining equipment health is essential for the smooth flow of a manufacturing process. This…
(more)
▼ Predictive Maintenance is becoming increasingly important in the automated industry, as maintaining equipment health is essential for the smooth flow of a manufacturing process. This thesis focuses on introducing a model-based technique for the predictive maintenance of robotic motors. The outcomes of this technique, when applied to practical scenarios as well as in simulations, are shown and discussed below.
The thesis aims to provide a strong theoretical justification to an idea, that was developed and tested successfully on real-life robot motor data. The idea involves applying the wavelet transform to the motor current and gathering the occurrence of frequencies relative to the central frequency (frequency ratio) to detect the presence of an anomalous frequency ratio. The enormous amount of information documented on experiments using Motor Current Signature Analysis (MCSA) for fault detection and diagnosis (FDD) is used here to diagnose the fault.
Simulations of two faulty models, Stator inter-turn winding short and eccentricity fault, have been developed and tested, at variable speeds, with this technique to provide assertive results. Also, the positive results obtained while the technique was applied to the robotic motor data has been presented and explained. This idea is different and more useful that MCSA alone as it works for variable speed conditions. Lastly, the thesis provides suggestions on how to expand on the technique to develop a useful predictive maintenance tool for robotic motors.
Advisors/Committee Members: Longoria, Raul G. (advisor).
Subjects/Keywords: Motor fault detection and diagnosis; Model-based diagnosis; Wavelet transform; Frequency ratio; Conditional monitoring
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APA (6th Edition):
-7389-5998. (2019). Model-based fault detection and diagnosis of BLDC motors working at variable speed using wavelet transform. (Masters Thesis). University of Texas – Austin. Retrieved from http://dx.doi.org/10.26153/tsw/3181
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-7389-5998. “Model-based fault detection and diagnosis of BLDC motors working at variable speed using wavelet transform.” 2019. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://dx.doi.org/10.26153/tsw/3181.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-7389-5998. “Model-based fault detection and diagnosis of BLDC motors working at variable speed using wavelet transform.” 2019. Web. 13 Apr 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-7389-5998. Model-based fault detection and diagnosis of BLDC motors working at variable speed using wavelet transform. [Internet] [Masters thesis]. University of Texas – Austin; 2019. [cited 2021 Apr 13].
Available from: http://dx.doi.org/10.26153/tsw/3181.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-7389-5998. Model-based fault detection and diagnosis of BLDC motors working at variable speed using wavelet transform. [Masters Thesis]. University of Texas – Austin; 2019. Available from: http://dx.doi.org/10.26153/tsw/3181
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
4.
Bissonnette, Mathew Ward.
Adaptive vehicle control by combined DYC and FWS.
Degree: MSin Engineering, Mechanical Engineering, 2014, University of Texas – Austin
URL: http://hdl.handle.net/2152/26317
► Vehicle stability is an important consideration in vehicle design. When driver intervention is insufficient, safety can be improved by the addition of vehicle stability control…
(more)
▼ Vehicle stability is an important consideration in vehicle design. When driver intervention is insufficient, safety can be improved by the addition of vehicle stability control (VSC). Typical vehicle stability controllers are designed using a linearized vehicle model and an assumed set of parameters. However, some parameters like mass and inertial properties may not be constant between operations. To recover controller performance in the presence of unknown parameters, adaptive estimates can be developed. This thesis seeks to implement a model reference adaptive controller for yaw rate and side slip control and to evaluate any implementation issues that may arise. A linearized vehicle model is used for controller design via a Lyapunov approach and a combined front wheel steering (FWS) and direct yaw control (DYC) controller is developed. The combined FWS+DYC controller is tested in a low friction double lane change with initial parameter estimation error. The FWS+DYC controller was found to be robust to parameter changes, and the adaptive parameter estimates did not provide any noticeable improvement over the non-adaptive case. A four wheel steering (4WS) controller is developed by a similar approach and tested under the same conditions. Both controllers were found to be effective at stabilizing the vehicle. An unexpected finding was that though the combined FWS+DYC controller was effective even in low friction conditions with parameter errors, the required motor torque was very large and oscillated rapidly. This was diminished through the addition of a low pass filter on the controller yaw moment output, but could not be removed entirely.
Advisors/Committee Members: Longoria, Raul G. (advisor).
Subjects/Keywords: Adaptive control; MRAC; DYC; FWS
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APA (6th Edition):
Bissonnette, M. W. (2014). Adaptive vehicle control by combined DYC and FWS. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/26317
Chicago Manual of Style (16th Edition):
Bissonnette, Mathew Ward. “Adaptive vehicle control by combined DYC and FWS.” 2014. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/26317.
MLA Handbook (7th Edition):
Bissonnette, Mathew Ward. “Adaptive vehicle control by combined DYC and FWS.” 2014. Web. 13 Apr 2021.
Vancouver:
Bissonnette MW. Adaptive vehicle control by combined DYC and FWS. [Internet] [Masters thesis]. University of Texas – Austin; 2014. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/26317.
Council of Science Editors:
Bissonnette MW. Adaptive vehicle control by combined DYC and FWS. [Masters Thesis]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/26317
5.
Zhang, Fu.
Simulation of dynamic systems with uncertain parameters.
Degree: PhD, Mechanical Engineering., 2004, University of Texas – Austin
URL: http://hdl.handle.net/2152/1464
Subjects/Keywords: Simulation methods; Uncertainty (Information theory); Engineering systems – Simulation methods; System analysis
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APA (6th Edition):
Zhang, F. (2004). Simulation of dynamic systems with uncertain parameters. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/1464
Chicago Manual of Style (16th Edition):
Zhang, Fu. “Simulation of dynamic systems with uncertain parameters.” 2004. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/1464.
MLA Handbook (7th Edition):
Zhang, Fu. “Simulation of dynamic systems with uncertain parameters.” 2004. Web. 13 Apr 2021.
Vancouver:
Zhang F. Simulation of dynamic systems with uncertain parameters. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2004. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/1464.
Council of Science Editors:
Zhang F. Simulation of dynamic systems with uncertain parameters. [Doctoral Dissertation]. University of Texas – Austin; 2004. Available from: http://hdl.handle.net/2152/1464
6.
Wang, Junmin, 1974-.
Coordinated and reconfigurable vehicle dynamics control.
Degree: PhD, Mechanical Engineering, 2007, University of Texas – Austin
URL: http://hdl.handle.net/2152/13251
► This dissertation describes a coordinated and reconfigurable vehicle dynamics control system. With the continuous development of vehicle actuation/sensing technologies, coordinating all the available actuation resources…
(more)
▼ This dissertation describes a coordinated and reconfigurable vehicle dynamics
control system. With the continuous development of vehicle actuation/sensing
technologies, coordinating all the available actuation resources to improve system
performance and expand system operational envelope has become an active research
topic that has received significant attention from both academia and industry. Given the
complex nature of tire forces that are relied upon for inducing generalized forces for
vehicle motion control, the main challenge is how to coordinate all the tire forces in a
unified and optimal manner to achieve the overall control objectives even under adverse
conditions.
In this dissertation, a hierarchically-coordinated and reconfigurable vehicle
dynamics control system is proposed. A higher-level robust nonlinear controller is
designed to produce the generalized forces/moment for controlling vehicle planar
motions. An innovative control allocation scheme is designed to distribute the
generalized forces/moment to slip and slip angle of each tire with the considerations of
vehicle dynamics and environmental variations. Individual tire slip and slip angles are
selected as the control variables to resolve the inherent tire force nonlinear constraints
which otherwise may make the system more complex and computationally expensive. A
real-time adaptable, computationally efficient accelerated fixed-point method with
improved convergence rate when actuation saturates is proposed to solve the amplitude
and rate constrained quadratic programming (QP) control allocation problem. To track
the desired allocated slip and slip angle of each tire and therefore the required tire
longitudinal and lateral forces to fulfill the control objectives, a combined tire slip and
slip angle tracking control system is developed to manipulate the driving/braking/steering
actuation of each wheel independent to vehicle body states. The overall system is
evaluated on a commercial full-vehicle model provided by CarSim®
under various
adverse driving conditions including scenarios where vehicle actuator failures occur.
Compared with those of existing vehicle control systems, significantly expanded system
operational envelop and greatly reduced driver efforts were observed.
Advisors/Committee Members: Longoria, Raul G. (advisor).
Subjects/Keywords: Motor vehicles – Dynamics; Motor vehicles – Automatic control; Motor vehicles – Tires; Motor vehicles – Steering-gear; Motor vehicles – Brakes; Actuators
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APA (6th Edition):
Wang, Junmin, 1. (2007). Coordinated and reconfigurable vehicle dynamics control. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/13251
Chicago Manual of Style (16th Edition):
Wang, Junmin, 1974-. “Coordinated and reconfigurable vehicle dynamics control.” 2007. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/13251.
MLA Handbook (7th Edition):
Wang, Junmin, 1974-. “Coordinated and reconfigurable vehicle dynamics control.” 2007. Web. 13 Apr 2021.
Vancouver:
Wang, Junmin 1. Coordinated and reconfigurable vehicle dynamics control. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2007. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/13251.
Council of Science Editors:
Wang, Junmin 1. Coordinated and reconfigurable vehicle dynamics control. [Doctoral Dissertation]. University of Texas – Austin; 2007. Available from: http://hdl.handle.net/2152/13251
7.
LeSage, Jonathan Robert, 1985-.
Energy storage-aware prediction/control for mobile systems with unstructured loads.
Degree: PhD, Mechanical Engineering, 2013, University of Texas – Austin
URL: http://hdl.handle.net/2152/21346
► Mobile systems, such as ground robots and electric vehicles, inherently operate in stochastic environments where load demands are largely unknown. Onboard energy storage, most commonly…
(more)
▼ Mobile systems, such as ground robots and electric vehicles, inherently operate in stochastic environments where load demands are largely unknown. Onboard energy storage, most commonly an electrochemical battery system, can significantly constrain operation. As such, mission planning and control of mobile systems can benefit from a priori knowledge about battery dynamics and constraints, especially the rate-capacity and recovery effects. To help overcome overly conservative predictions common with most existing battery remaining run-time algorithms, a prediction scheme was proposed. For characterization of a priori unknown power loads, an unsupervised Gaussian mixture routine identifies/clusters the measured power loads, and a jump-Markov chain characterizes the load transients. With the jump-Markov load forecasts, a model-based particle filter scheme predicts battery remaining run-time. Monte Carlo simulation studies demonstrate the marked improvement of the proposed technique. It was found that the increase in computational complexity from using a particle filter was justified for power load transient jumps greater than 13.4% of total system power. A multivariable reliability method was developed to assess the feasibility of a planned mission. The probability of mission completion is computed as the reliability integral of mission time exceeding the battery run-time. Because these random variables are inherently dependent, a bivariate characterization was necessary and a method is presented for online estimation of the process correlation via Bayesian updating. Finally, to abate transient shutdown of mobile systems, a model predictive control scheme is proposed that enforces battery terminal voltage constraints under stochastic loading conditions. A Monte Carlo simulation study of a small ground vehicle indicated significant improvement in both time and distance traveled as a result. For evaluation of the proposed methodologies, a laboratory terrain environment was designed and constructed for repeated mobile system discharge studies. The test environment consists of three distinct terrains. For each discharge study, a small unmanned ground vehicle traversed the stochastic terrain environment until battery exhaustion. Results from field tests with a Packbot ground vehicle in generic desert terrain were also used. Evaluation of the proposed prediction algorithms using the experimental studies, via relative accuracy and [alpha]-[lambda] prognostic metrics, indicated significant gains over existing methods.
Advisors/Committee Members: Longoria, Raul G. (advisor).
Subjects/Keywords: Energy storage; Mobile systems; Ground robotics; Model-based prediction; Model-predictive control; Particle filter; Unsupervised learning
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APA ·
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APA (6th Edition):
LeSage, Jonathan Robert, 1. (2013). Energy storage-aware prediction/control for mobile systems with unstructured loads. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/21346
Chicago Manual of Style (16th Edition):
LeSage, Jonathan Robert, 1985-. “Energy storage-aware prediction/control for mobile systems with unstructured loads.” 2013. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/21346.
MLA Handbook (7th Edition):
LeSage, Jonathan Robert, 1985-. “Energy storage-aware prediction/control for mobile systems with unstructured loads.” 2013. Web. 13 Apr 2021.
Vancouver:
LeSage, Jonathan Robert 1. Energy storage-aware prediction/control for mobile systems with unstructured loads. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2013. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/21346.
Council of Science Editors:
LeSage, Jonathan Robert 1. Energy storage-aware prediction/control for mobile systems with unstructured loads. [Doctoral Dissertation]. University of Texas – Austin; 2013. Available from: http://hdl.handle.net/2152/21346
8.
Beachum, David Robert.
Methods for assessing the safety of autonomous vehicles.
Degree: MSin Engineering, Mechanical Engineering, 2019, University of Texas – Austin
URL: http://dx.doi.org/10.26153/tsw/3214
► While the widespread adoption of autonomous vehicles (AVs) has the potential to drastically reduce the rate of traffic collisions, failure to verify their safe operation…
(more)
▼ While the widespread adoption of autonomous vehicles (AVs) has the potential to drastically reduce the rate of traffic collisions, failure to verify their safe operation may expose the public to unacceptable risks. Due to the low frequency of traffic fatalities, verifying AV safety statistically via on-road testing is likely to be cost- and time-prohibitive, driving the need for alternate methods. This thesis examines four potential methods to assess AV safety: simulation, Failure Modes and Effects Analysis (FMEA), Fault Tree Analysis (FTA), and Systems Theoretic Process Analysis (STPA). The findings show two methods with potential: simulation based on data recorded from real environments, and quantitative FTA combined with a secondary analysis of the vehicle's machine learning algorithms. However, both approaches require significant amounts of data which may be expensive to gather. Further research into the safety of machine learning algorithms and further developments in AV simulation technology are required in order to develop more cost-effective methods for assessing AV safety.
Advisors/Committee Members: Longoria, Raul G. (advisor).
Subjects/Keywords: Autonomous vehicles; Driverless cars; Self-driving cars; Safety; Failure modes and effects analysis; Fault tree analysis; Systems theoretic process analysis
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APA (6th Edition):
Beachum, D. R. (2019). Methods for assessing the safety of autonomous vehicles. (Masters Thesis). University of Texas – Austin. Retrieved from http://dx.doi.org/10.26153/tsw/3214
Chicago Manual of Style (16th Edition):
Beachum, David Robert. “Methods for assessing the safety of autonomous vehicles.” 2019. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://dx.doi.org/10.26153/tsw/3214.
MLA Handbook (7th Edition):
Beachum, David Robert. “Methods for assessing the safety of autonomous vehicles.” 2019. Web. 13 Apr 2021.
Vancouver:
Beachum DR. Methods for assessing the safety of autonomous vehicles. [Internet] [Masters thesis]. University of Texas – Austin; 2019. [cited 2021 Apr 13].
Available from: http://dx.doi.org/10.26153/tsw/3214.
Council of Science Editors:
Beachum DR. Methods for assessing the safety of autonomous vehicles. [Masters Thesis]. University of Texas – Austin; 2019. Available from: http://dx.doi.org/10.26153/tsw/3214
9.
Pawar, Suraj Rajendra.
Recursive estimation of Systemic Vascular Resistance using measurements from a left ventricular assist device.
Degree: MSin Engineering, Mechanical Engineering, 2019, University of Texas – Austin
URL: http://dx.doi.org/10.26153/tsw/5630
► Cardiovascular disease is the leading cause of deaths worldwide, and one of the ways to treat patients with congestive heart failure is to perform a…
(more)
▼ Cardiovascular disease is the leading cause of deaths worldwide, and one of the ways to treat patients with congestive heart failure is to perform a heart transplant. As the demand for this procedure rises, the disproportionate availability of suitable donors needs to be countered with ways to care and sustain patients who are waiting for a transplant. In this regard, the use of left ventricular assist devices (LVAD) has increased. The research conducted in this Thesis is primarily concerned with the TORVAD [superscript TM] (Windmill Cardiovascular Systems In.,
Austin , TX), a rotary blood pump type LVAD. The load faced by the left ventricle during ejection of blood is termed as Systemic Vascular Resistance (SVR), and is an important parameter that can indicate cardiovascular health. Abnormalities in SVR have been found to be a good indicator of hypertension, heart failure, shock and sepsis. A consistently low SVR can even be a predictor of mortality. The goal of this Thesis is to investigate ways of recursively estimating SVR in a patient, by using measurements that the TORVAD [superscript TM] provides. The Extended Kalman Filter is used to develop an estimation algorithm based on a reduced order model of the cardiovascular system. The estimation accuracy of the algorithm is tested by generating data through simulations of a computational model of the cardiovascular system, and by collecting measurements from the TORVAD [superscript TM] while it operates in a mock circulation loop. The algorithm is found to estimate SVR satisfactorily using the available measurements, and is robust to different initial conditions.
Advisors/Committee Members: Longoria, Raul G. (advisor).
Subjects/Keywords: Estimation; Kalman Filter; Extended Kalman Filter; Bond graphs; Cardiovascular system; Modeling; Impedance analysis; Estimability; LVAD; Left ventricular assist device
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APA (6th Edition):
Pawar, S. R. (2019). Recursive estimation of Systemic Vascular Resistance using measurements from a left ventricular assist device. (Masters Thesis). University of Texas – Austin. Retrieved from http://dx.doi.org/10.26153/tsw/5630
Chicago Manual of Style (16th Edition):
Pawar, Suraj Rajendra. “Recursive estimation of Systemic Vascular Resistance using measurements from a left ventricular assist device.” 2019. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://dx.doi.org/10.26153/tsw/5630.
MLA Handbook (7th Edition):
Pawar, Suraj Rajendra. “Recursive estimation of Systemic Vascular Resistance using measurements from a left ventricular assist device.” 2019. Web. 13 Apr 2021.
Vancouver:
Pawar SR. Recursive estimation of Systemic Vascular Resistance using measurements from a left ventricular assist device. [Internet] [Masters thesis]. University of Texas – Austin; 2019. [cited 2021 Apr 13].
Available from: http://dx.doi.org/10.26153/tsw/5630.
Council of Science Editors:
Pawar SR. Recursive estimation of Systemic Vascular Resistance using measurements from a left ventricular assist device. [Masters Thesis]. University of Texas – Austin; 2019. Available from: http://dx.doi.org/10.26153/tsw/5630
University of Texas – Austin
10.
Salhotra, Gautam Vijay.
Model-based controller design and simulation of a marine chiller.
Degree: MSin Engineering, Mechanical Engineering, 2012, University of Texas – Austin
URL: http://hdl.handle.net/2152/39440
► For the past decade, the US Navy has committed to fundamental research and technology development on its next generation of surface ships. The vision is…
(more)
▼ For the past decade, the US Navy has committed to fundamental research and technology development on its next generation of surface ships. The vision is that these warships will be dynamically reconfigurable, energy-efficient, and have state-of-the-art pulsed energy weapons and sensors onboard. These developments represent a significant increase in highly dynamic on-board electrical systems that will produce correspondingly large amounts of dynamic heat generation, which, if not managed properly, will likely produce significant thermal side effects. In previous work, a highly customizable simulation framework has been developed to address thermal management issues across both the mechanical and electrical domains. This software environment is called the Dynamic Thermal Modeling and Simulation (DTMS) framework. The purpose of the current work is to introduce modern control theory into DTMS, thus providing the framework with the ability to control large-scale system simulations. The research reported in this thesis uses control of a marine chiller as a simulation vehicle. Several control strategies were implemented. These included the well-established PID controller as well as a new controller based on optimal control theory. Results for chiller simulations in the case of no-control, PID control, and optimal control are presented here. The comparative effectiveness of these controls in bringing the chiller to startup equilibrium is investigated. Response of the chiller model and the optimal controller to highly dynamic, varying heat loads was tested. The PID controller in DTMS is modeled as a special case of the transfer function control scheme. A PID controller is simple to implement but responses are inherently local and multiple controls in a system or subsystem simulation can easily lead to conflicts. The optimal control problem has been modeled as an Infinite Horizon Linear Quadratic Regulator (LQR) problem. This formulation is not local and does not create undesirable effects in parts of the system that not controlled directly by controller inputs. Using the York 200-ton marine chiller as an example, specific steps required to formulate the LQR problem are documented in this report. Implementation of the LQR controller was demonstrated for the startup to steady-state function of the chiller at full load. Treatment of the optimal controller ends with simulation of the chiller and its LQR controller under the influence of varying dynamic heat loads in a chilled water loop. The heat load variation examined has highly transient characteristics that affect the temperature of the fresh water entering the chiller, as well as the refrigerant pressure and temperature in the evaporator. The LQR formulation is shown to actively adjust to these varying operating points in a smooth and responsive manner.
Advisors/Committee Members: Kiehne, Thomas M. (advisor), Longoria, Raul G. (committee member).
Subjects/Keywords: Model-based design; Optimal control; LQR; Simulation; Chiller
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APA (6th Edition):
Salhotra, G. V. (2012). Model-based controller design and simulation of a marine chiller. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/39440
Chicago Manual of Style (16th Edition):
Salhotra, Gautam Vijay. “Model-based controller design and simulation of a marine chiller.” 2012. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/39440.
MLA Handbook (7th Edition):
Salhotra, Gautam Vijay. “Model-based controller design and simulation of a marine chiller.” 2012. Web. 13 Apr 2021.
Vancouver:
Salhotra GV. Model-based controller design and simulation of a marine chiller. [Internet] [Masters thesis]. University of Texas – Austin; 2012. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/39440.
Council of Science Editors:
Salhotra GV. Model-based controller design and simulation of a marine chiller. [Masters Thesis]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/39440
University of Texas – Austin
11.
Munoz, Brad Ernest.
Reliability methods in dynamic system analysis.
Degree: MSin Engineering, Mechanical Engineering, 2012, University of Texas – Austin
URL: http://hdl.handle.net/2152/20038
► Standard techniques used to analyze a system's response with uncertain system parameters or inputs, are generally Importance sampling methods. Sampling methods require a large number…
(more)
▼ Standard techniques used to analyze a system's response with uncertain system parameters or inputs, are generally Importance sampling methods. Sampling methods require a large number of simulation runs before the system
output statistics can be analyzed. As model fidelity increases, sampling techniques become computationally infeasible, and Reliability methods have gained popularity as an analysis method that requires significantly fewer simulation runs. Reliability analysis is an analytic technique which finds a particular point in the design space that can accurately be related to the probability of system failure. However, application to dynamic systems have remained limited.
In the following thesis a First Order Reliability Method (FORM) is used to determine the failure probability of a dynamic system due to system/input uncertainties. A pendulum cart system is used as a case study to demonstrate the FORM on a dynamic system. Three failure modes are discussed which
correspond to the maximum pendulum angle, the maximum system velocity,
and a combined requirement that neither the maximum pendulum angle or system velocity are exceeded. An explicit formulation is generated from the implicit formulation using a Response Surface Methodology, and the FORM is performed using the explicit estimate. Although the analysis converges with minimal simulation computations, attempts to verify FORM results illuminate current limitations of the methodology. The results of this initial study conclude that, currently, sampling techniques are necessary to verify the FORM results, which restricts the potential applications of the FORM methodology. Suggested future work focuses on result verification without the use of Importance sampling which would allow Reliability methods to have widespread applicability.
Advisors/Committee Members: Longoria, Raul G. (advisor), Fahrenthold, Eric P (committee member).
Subjects/Keywords: First Order Reliability; Reliability analysis; Analytic uncertainty quantification
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APA (6th Edition):
Munoz, B. E. (2012). Reliability methods in dynamic system analysis. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/20038
Chicago Manual of Style (16th Edition):
Munoz, Brad Ernest. “Reliability methods in dynamic system analysis.” 2012. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/20038.
MLA Handbook (7th Edition):
Munoz, Brad Ernest. “Reliability methods in dynamic system analysis.” 2012. Web. 13 Apr 2021.
Vancouver:
Munoz BE. Reliability methods in dynamic system analysis. [Internet] [Masters thesis]. University of Texas – Austin; 2012. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/20038.
Council of Science Editors:
Munoz BE. Reliability methods in dynamic system analysis. [Masters Thesis]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/20038
University of Texas – Austin
12.
-2427-9523.
Hybrid control and model-based assertions for autonomous intersection management system as a cyber-physical system.
Degree: MSin Engineering, Mechanical engineering, 2016, University of Texas – Austin
URL: http://hdl.handle.net/2152/39042
► A cyber-physical system (CPS) consists of multiple physical components that collab- orate through a network during real-time operation according to system-level commands. A hybrid control,…
(more)
▼ A cyber-physical system (CPS) consists of multiple physical components that collab- orate through a network during real-time operation according to system-level commands. A hybrid control, which generates discrete system-level commands and handles the low-level physical dynamics for each component, is of singular importance to a CPS. For a CPS, live- ness and safety require that the system is always eventually doing what is desirable without any undesirable behavior, and have to be carefully addressed. The advance in information technology and autonomous driving make it possible to establish an autonomous intersection management system (AIMS) for ground autonomous vehicles, which can potentially improve traffic efficiency and reduce intersection car accidents. This work presents a hybrid control and introduces model-based assertions for such an AIMS. System-level traffic requirements are expressed in the form of linear temporal logic (LTL) specifications in the generalized reactivity formulas with rank 1 (GR(1)) and a two-player game is solved to synthesize a discrete traffic network controller. DaNI, a motor-driven laboratory robot vehicle, is mod- eled using a bond-graph approach, and a nonlinear vehicle trajectory sliding-mode controller (SMC) is mathematically and numerically described. The discrete traffic controller instructs each robot vehicle to pass through the intersection of interest at a certain time and the vehicle’s trajectory within the intersection is controlled by the SMC. Using simulation, it is shown that the synthesized discrete controller is able to determine proper system actions in response to traffic data and environmental actions while maintaining liveness and safety specifications. A laboratory study on a simple AIMS is demonstrated to depict the basic design structure of a AIMS as a CPS. The results suggest that model-based assertions, which monitor and validate a CPS by assertions based on physical models, can be helpful in de- tecting physics-related abnormalities during operation of a CPS that may not be captured by a software-level analysis. Using simulations, it is shown how the accuracy of a continuous vehicle trajectory controller, such as a SMC, can provide informative guidance on the design of model-based assertions.
Advisors/Committee Members: Longoria, Raul G. (advisor), Fernandez, Benito R (committee member).
Subjects/Keywords: Cyber-physical system; AIMS; Hybrid control; Linear temporal logic; Model-based assertions; Sliding-mode control
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APA (6th Edition):
-2427-9523. (2016). Hybrid control and model-based assertions for autonomous intersection management system as a cyber-physical system. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/39042
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-2427-9523. “Hybrid control and model-based assertions for autonomous intersection management system as a cyber-physical system.” 2016. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/39042.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-2427-9523. “Hybrid control and model-based assertions for autonomous intersection management system as a cyber-physical system.” 2016. Web. 13 Apr 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-2427-9523. Hybrid control and model-based assertions for autonomous intersection management system as a cyber-physical system. [Internet] [Masters thesis]. University of Texas – Austin; 2016. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/39042.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-2427-9523. Hybrid control and model-based assertions for autonomous intersection management system as a cyber-physical system. [Masters Thesis]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/39042
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
University of Texas – Austin
13.
Bakshi, Soovadeep.
Modeling and control of transition dynamics in a two-piston toroidal blood pump.
Degree: MSin Engineering, Mechanical Engineering, 2017, University of Texas – Austin
URL: http://hdl.handle.net/2152/62920
► Ventricular Assist Devices (VADs) are becoming more and more popular as a treatment option for patients with weak or failing hearts, and this has made…
(more)
▼ Ventricular Assist Devices (VADs) are becoming more and more popular as a treatment option for patients with weak or failing hearts, and this has made research into the analysis and control of VADs more necessary. This thesis is a study of the modeling and control of transition dynamics of the pistons in the TORVAD, a toroidal VAD developed by Windmill Cardiovascular Systems, Inc. (WCS, Inc.,
Austin, TX).
The main objective of this thesis is to design a model-based control strategy for trajectory tracking in the transition phase of the TORVAD with minimal oscillations in the control voltages provided to the motors. A bond graph-based hybrid model of the pump is designed for better understanding of the fluid-mechanical coupling in the TORVAD, as well as performance comparison of the designed controllers. Using a simplified version of the pump model as the nominal plant, a model-based cascaded controller is designed and compared with an error-based PID control strategy. Results for specified testing trajectories, and a preliminary robustness analysis of the two control strategies are presented, and the cascaded control strategy is shown to generate control voltages which are much less oscillatory than that of the PID control strategy.
Advisors/Committee Members: Longoria, Raul G. (advisor), Beaman, Joseph J (committee member).
Subjects/Keywords: Dynamic systems; Control; VAD
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APA (6th Edition):
Bakshi, S. (2017). Modeling and control of transition dynamics in a two-piston toroidal blood pump. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/62920
Chicago Manual of Style (16th Edition):
Bakshi, Soovadeep. “Modeling and control of transition dynamics in a two-piston toroidal blood pump.” 2017. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/62920.
MLA Handbook (7th Edition):
Bakshi, Soovadeep. “Modeling and control of transition dynamics in a two-piston toroidal blood pump.” 2017. Web. 13 Apr 2021.
Vancouver:
Bakshi S. Modeling and control of transition dynamics in a two-piston toroidal blood pump. [Internet] [Masters thesis]. University of Texas – Austin; 2017. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/62920.
Council of Science Editors:
Bakshi S. Modeling and control of transition dynamics in a two-piston toroidal blood pump. [Masters Thesis]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/62920
University of Texas – Austin
14.
Varala, Vinod Kumar.
Modeling of horizontal drilling.
Degree: MSin Engineering, Mechanical engineering, 2016, University of Texas – Austin
URL: http://hdl.handle.net/2152/43683
► While majority of today’s oil wells employ directional drilling technology (deviated, extended reach and horizontal wells), a thorough understanding of the drill string dynamics is…
(more)
▼ While majority of today’s oil wells employ directional drilling technology (deviated, extended reach and horizontal wells), a thorough understanding of the drill string dynamics is necessary to increase the drilling efficiency. Wellbore in such wells spans long horizontal distances through the shale to extract oil and natural gas effectively. Very long slender drill pipes transmit the required torque and cutting force through miles of distance from the earth’s surface to the drill bit. Drill string is subjected to different loads and torques which can cause coupled random excitations and failure of its components (drill pipes, bit, sensor tools and wellbore) eventually. If left unnoticed, these vibrations can cause stuck pipe and reduced rate of penetration, both of which are heavily cost dependent. Identifying the conditions causing harmful vibrations hence would significantly reduce cost and time. Controlling the drill string and bottom hole assembly is one way of mitigating the dynamic instability, which is currently done by means of controlling the rotational speed, torque applied and axial force applied to the drill string. This article presents modeling of horizontal drilling and the comparison of horizontal and vertical drill string dynamics. Drill string components are discretized into lumped elements based on their curvature. A vertical wellbore structure with same drill string components is considered for comparison. The computations are performed in MATLAB. Results and discussions are presented in the later part of the report.
Advisors/Committee Members: Chen, Dongmei, Ph. D. (advisor), Longoria, Raul G (committee member).
Subjects/Keywords: Oil and gas industry; Directional drilling; Drill string; Stick-slip; Bit-bounce; Lumped mass
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APA (6th Edition):
Varala, V. K. (2016). Modeling of horizontal drilling. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/43683
Chicago Manual of Style (16th Edition):
Varala, Vinod Kumar. “Modeling of horizontal drilling.” 2016. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/43683.
MLA Handbook (7th Edition):
Varala, Vinod Kumar. “Modeling of horizontal drilling.” 2016. Web. 13 Apr 2021.
Vancouver:
Varala VK. Modeling of horizontal drilling. [Internet] [Masters thesis]. University of Texas – Austin; 2016. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/43683.
Council of Science Editors:
Varala VK. Modeling of horizontal drilling. [Masters Thesis]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/43683
University of Texas – Austin
15.
-0583-9003.
Hierarchical control of a two-piston toroidal blood pump.
Degree: PhD, Mechanical Engineering, 2019, University of Texas – Austin
URL: http://dx.doi.org/10.26153/tsw/2137
► The two-piston toroidal pump (2PTP) is a new pulsatile pumping paradigm with potential physiological advantages compared to existing continuous flow blood pump technologies. The purpose…
(more)
▼ The two-piston toroidal pump (2PTP) is a new pulsatile pumping paradigm with potential physiological advantages compared to existing continuous flow blood pump technologies. The purpose of this research was to develop hierarchical control methods for this new pumping modality, including high-level physiological control and low-level piston control. First, geometric constraints were identified for this pump architecture and piston path-planning methods were developed to define pulsatile ejections. To develop high-level control, an open-loop lumped parameter model of the cardiovascular system was improved with a modified end-diastolic pressure-volume elastance curve and then used to study ventricular function curves with different types of blood pump support. It was determined that synchronous counterpulse support with the 2PTP provides a more physiological response to preload compared to continuous flow, which could prevent overpumping and ventricular suction at low preloads. To develop low-level piston control, a variable structure model of the 2PTP was developed and then used to test improved control techniques. An algorithmic approach to switched bond graph structures was developed for hydraulic networks to derive state equations for the variable structure model. Linear control and Kalman-filter-based estimation methods were developed with a reduced-order model of the pump. Improved control and estimation methods were tested and confirmed in preliminary experiments in mock circulatory loops. Estimation of pump flow and differential pump pressure were verified, which could be useful feedback to physiological control or as diagnostic tools for doctors.
Advisors/Committee Members: Longoria, Raul G. (advisor), Beaman, Joseph (committee member), Rausch, Manuel (committee member), Chen, Dongmei (committee member).
Subjects/Keywords: Ventricular assist device; Cardiovascular modeling; Physiological control; Variable structure model
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APA (6th Edition):
-0583-9003. (2019). Hierarchical control of a two-piston toroidal blood pump. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://dx.doi.org/10.26153/tsw/2137
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-0583-9003. “Hierarchical control of a two-piston toroidal blood pump.” 2019. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://dx.doi.org/10.26153/tsw/2137.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-0583-9003. “Hierarchical control of a two-piston toroidal blood pump.” 2019. Web. 13 Apr 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-0583-9003. Hierarchical control of a two-piston toroidal blood pump. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2019. [cited 2021 Apr 13].
Available from: http://dx.doi.org/10.26153/tsw/2137.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-0583-9003. Hierarchical control of a two-piston toroidal blood pump. [Doctoral Dissertation]. University of Texas – Austin; 2019. Available from: http://dx.doi.org/10.26153/tsw/2137
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
University of Texas – Austin
16.
-6028-0636.
Cost-conscious control strategies for wind turbine systems.
Degree: PhD, Mechanical Engineering, 2017, University of Texas – Austin
URL: http://hdl.handle.net/2152/47462
► Wind energy is one of the most abundant renewable energy sources that can meet future energy demands. Despite its fast growth, wind energy is still…
(more)
▼ Wind energy is one of the most abundant renewable energy sources that can meet future energy demands. Despite its fast growth, wind energy is still a marginal player in electricity generation. The key issues preventing wider deployment of wind turbines include low energy conversion efficiency, high maintenance cost, wind intermittency and unpredictability etc. These issues lead to considerably higher cost of wind power compared to that of traditional power sources. This work is focused on control designs to overcome the above challenges. First, control algorithms are developed for energy capture maximization. During partial load operation, wind turbine rotor speed is continuously adjusted to remain optimal operation by manipulating the electromagnetic torque applied to the generator. In this dissertation, a dynamic programming based real-time controller (DPRC) and a gain modified optimal torque controller (GMOTC) are developed for faster convergence to optimal power operation under volatile wind speed and better robustness against modeling uncertainties. Secondly, fatigue loading mitigation techniques are developed to reduce the maintenance cost of a wind turbine. During partial load operation, a generator torque-based fatigue mitigation method is devised to reduce the impact of exacerbated tower bending moments associated with the resonance effect. During full load operation, a H₂ optimization has been carried out for gain scheduling of a Proportional-Integral blade pitch controller. It improves speed regulation and reduces drivetrain fatigue loading with less oscillations of turbine rotor speed and generator torque. Thirdly, battery energy storage systems (BESS) have been integrated with wind turbines to mitigate wind intermittence and make wind power dispatchable as traditional power sources. Equipped with a probabilistic wind speed forecasting model, a new power scheduling and real-time control approach has been proposed to improve the performance of the integrated system. Finally, control designs are oriented to wind turbine participation in grid primary frequency regulation. The fast active power injection/absorption capability of wind turbine enables it to rapidly change its power output for stablizing the grid frequency following an sudden power imbalance event. In addition to quick response to grid frequency deviation event, the proposed controller guarantees turbine stability with smooth control actions.
Advisors/Committee Members: Chen, Dongmei, Ph. D. (advisor), Baldick, Ross (committee member), Djurdjanovic, Dragan (committee member), Longoria, Raul G. (committee member), Barr, Ronald (committee member).
Subjects/Keywords: Wind turbine; Wind energy; Adaptive algorithm; Power dispatch; Frequency regulation; Energy maximization; Fatigue mitigation
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APA (6th Edition):
-6028-0636. (2017). Cost-conscious control strategies for wind turbine systems. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/47462
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-6028-0636. “Cost-conscious control strategies for wind turbine systems.” 2017. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/47462.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-6028-0636. “Cost-conscious control strategies for wind turbine systems.” 2017. Web. 13 Apr 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-6028-0636. Cost-conscious control strategies for wind turbine systems. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2017. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/47462.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-6028-0636. Cost-conscious control strategies for wind turbine systems. [Doctoral Dissertation]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/47462
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
17.
Bass, Joseph Louis.
Nonholonomic Hamiltonian method for reacting molecular dynamics.
Degree: PhD, Mechanical Engineering, 2017, University of Texas – Austin
URL: http://hdl.handle.net/2152/62169
► Macroscale, mesoscale, and ab initio models of reacting shock physics are based, in their most general forms, on rate law descriptions of the chemical processes…
(more)
▼ Macroscale, mesoscale, and ab initio models of reacting shock physics
are based, in their most general forms, on rate law descriptions of the chemical processes of interest. Reacting molecular dynamics simulations, by contrast,
typically employ potential functions (holonomic Hamiltonian methods)
to model chemical reactions. An alternative approach to reacting molecular dynamics models the bonding-debonding process using a rate law, resulting in a nonholonomic Hamiltonian formulation. In previous work at macro and meso scales, discrete nonholonomic Hamiltonian methods have been applied
to develop very general models of shock impact and fragmentation process. In this dissertation a similar nonholonomic modeling methodology is used, at the molecular scale, to explicitly model transient chemical processes. Note that the chemistry problem is much more difficult, since both dissociation (fragmentation)
and the formation of new molecules must be modeled. The result
is the first general reacting molecular dynamics formulation which explicitly
models chemical kinetics. Simulation results using this method show good
agreement with experiment, for energy release and detonation products in two
widely used explosives (HMX and RDX). The reacting molecular dynamics simulation results are used to propose reaction mechanisms and species concentration based kinetics models suitable for use in meso and macro scale shock to detonation simulations. Computational modeling of energetic materials is capable of estimating molecular behavior under conditions not amenable to
direct experimental measurement. Further development of RMD methods
may help to provide a better understanding of energetic material behavior. This in turn may help to develop improved insensitive high energy density materials.
Advisors/Committee Members: Fahrenthold, Eric P. (advisor), Longoria, Raul G (committee member), Nichols, Steven P (committee member), Sepehrnoori, Kamy (committee member), Taleff, Eric M (committee member).
Subjects/Keywords: Molecular dynamics; Chemical kinetics
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APA (6th Edition):
Bass, J. L. (2017). Nonholonomic Hamiltonian method for reacting molecular dynamics. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/62169
Chicago Manual of Style (16th Edition):
Bass, Joseph Louis. “Nonholonomic Hamiltonian method for reacting molecular dynamics.” 2017. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/62169.
MLA Handbook (7th Edition):
Bass, Joseph Louis. “Nonholonomic Hamiltonian method for reacting molecular dynamics.” 2017. Web. 13 Apr 2021.
Vancouver:
Bass JL. Nonholonomic Hamiltonian method for reacting molecular dynamics. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2017. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/62169.
Council of Science Editors:
Bass JL. Nonholonomic Hamiltonian method for reacting molecular dynamics. [Doctoral Dissertation]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/62169
University of Texas – Austin
18.
-1090-5095.
Development of an upper-body robotic rehabilitation platform that furthers motor recovery after neuromuscular injuries.
Degree: PhD, Mechanical Engineering, 2018, University of Texas – Austin
URL: http://hdl.handle.net/2152/68010
► This dissertation presents the development of an upper-body exoskeleton and its control framework for robotic rehabilitation of the arm and shoulder after a neurological disorder…
(more)
▼ This dissertation presents the development of an upper-body exoskeleton and its control framework for robotic rehabilitation of the arm and shoulder after a neurological disorder such as a stroke. The first step is designing an exoskeleton hardware that supports natural mobility of the human upper body with a wide range of motion for enabling most rehabilitation exercises. The exoskeleton is equipped with torque-controllable actuation units for implementing various robotic rehabilitation protocols based on force and impedance behaviors. The control framework is designed to exhibit a highly backdrivable behavior with a gravity compensation for the robot's weight and optional gravity support for user's arm weight to promote voluntary movements of patients with motor impairments. The control framework also serves as a `substrate' of other robotic control behaviors for rehabilitation exercises by superimposing desired force or impedance profiles. A stability analysis is performed to examine the coupled stability between the robot and human. After designing the hardware and control, several experiments are carried out to test the mobility and dynamic behavior of the robot. Lastly, a human subject study evaluates the effectiveness of the robot's shoulder mechanism and control algorithm in assisting the coordination around the shoulder. The results show that the robot induces desirable coordination in the presence of abnormalities at the shoulder.
Advisors/Committee Members: Deshpande, Ashish D. (advisor), Longoria, Raul G. (committee member), Dingwell, Jonathan B. (committee member), Chen, Dongmei (committee member), Sulzer, James S. (committee member).
Subjects/Keywords: Robotic rehabilitation; Exoskeleton; Scapulohumeral rhythm; Neuromuscular injuries; Impedance control; Series elastic actuator; Motor learning; Stroke; Gravity support
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APA (6th Edition):
-1090-5095. (2018). Development of an upper-body robotic rehabilitation platform that furthers motor recovery after neuromuscular injuries. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/68010
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-1090-5095. “Development of an upper-body robotic rehabilitation platform that furthers motor recovery after neuromuscular injuries.” 2018. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/68010.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-1090-5095. “Development of an upper-body robotic rehabilitation platform that furthers motor recovery after neuromuscular injuries.” 2018. Web. 13 Apr 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-1090-5095. Development of an upper-body robotic rehabilitation platform that furthers motor recovery after neuromuscular injuries. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2018. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/68010.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-1090-5095. Development of an upper-body robotic rehabilitation platform that furthers motor recovery after neuromuscular injuries. [Doctoral Dissertation]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/68010
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
University of Texas – Austin
19.
Campos, Joaquín Miguel.
Hydro-pneumatic pulse forming networks.
Degree: PhD, Mechanical Engineering, 2017, University of Texas – Austin
URL: http://hdl.handle.net/2152/63054
► A novel method that combines energy storage and power condition- ing for renewable energy systems is presented. This method utilizes hydro- pneumatic energy storage elements,…
(more)
▼ A novel method that combines energy storage and power condition-
ing for renewable energy systems is presented. This method utilizes hydro-
pneumatic energy storage elements, also known as hydraulic accumulators,
as mechanical capacitors arranged in such a fashion as to create a hydro-
pneumatic pulse forming network (HPPFN) in a manner similar to sequen-
tially red pulsed formed networks (SFPFNs) used for electromagnetic railgun
launch. This pulse forming network has the ability to create a power output of
nearly constant amplitude for short durations, which is particularly well-suited
for supplying power to constant amplitude, duty-cycle-type loads.
The foundational principles are established herein for how HPPFN sys-
tems can be modeled and synthesized, so that systems can be designed and
scaled for practical applications. This foundation was established incremen-
tally in three parts. First, a working experimental test-bed system was con-
structed to prove the feasibility of operating a sequentially- red pulse forming
network using hydro-pneumatic energy storage elements in a manner analogous
to electromagnetic sequentially- red PFNs. Next, a modeling framework was developed for hydro-pneumatic pulse forming network synthesis. Finally, the
model-based synthesis approach was experimentally validated using the test-
bed to demonstrate that sizing and practical construction of HPPFN systems
can be accomplished. Suggestions for future work to extend these methods
and the applications of HPPFNs are provided.
Advisors/Committee Members: Longoria, Raul G. (advisor), Beaman, Joseph J (committee member), Fahrenthold, Eric P (committee member), Mallick, John A (committee member).
Subjects/Keywords: Hydro-pneumatic; Pulse forming networks; Sequentially fired pulse forming networks; Renewable energy; Sustainable energy; Energy storage; Power conditioning
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APA (6th Edition):
Campos, J. M. (2017). Hydro-pneumatic pulse forming networks. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/63054
Chicago Manual of Style (16th Edition):
Campos, Joaquín Miguel. “Hydro-pneumatic pulse forming networks.” 2017. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/63054.
MLA Handbook (7th Edition):
Campos, Joaquín Miguel. “Hydro-pneumatic pulse forming networks.” 2017. Web. 13 Apr 2021.
Vancouver:
Campos JM. Hydro-pneumatic pulse forming networks. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2017. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/63054.
Council of Science Editors:
Campos JM. Hydro-pneumatic pulse forming networks. [Doctoral Dissertation]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/63054
University of Texas – Austin
20.
Chirapongsananurak, Pisitpol.
Distribution circuit multi-time-scale simulation tool for wind turbine and photovoltaic integration analysis.
Degree: PhD, Electrical and Computer Engineering, 2016, University of Texas – Austin
URL: http://hdl.handle.net/2152/68247
► Power system phenomena can be characterized into three types according to their time scales. Firstly, electromagnetic transient phenomena, such as the effects of capacitor switching…
(more)
▼ Power system phenomena can be characterized into three types according to their time scales. Firstly, electromagnetic transient phenomena, such as the effects of capacitor switching and lightning strikes, have a time scale range of microseconds to milliseconds. Secondly, electromechanical transient phenomena, such as short-circuit faults on distribution circuits and inertial and frequency response of the power system, have a time scale in the order of hundreds of milliseconds to tens of seconds. Lastly, quasi-steady-state phenomena, such as voltage regulation, voltage unbalance, and wind speed and solar irradiance variation, have a time scale of several minutes and longer. Currently, because the time scales of these phenomena vary greatly from fractions of cycles to a few hours, only power system simulation tools for specific time scales are available.
The objective of this research is to develop an integrated distribution circuit multi-time-scale simulation tool designed specifically for applications in wind turbine and photovoltaic (PV) integration analysis. This research contributes a multi-time-scale simulation tool for analysis and control of voltage regulation due to the variability of wind speed, solar irradiance, and load consumption, determining the maximum penetration of wind turbines and PVs, and sizing of energy storage for peak load shaving and power variability control.
The proposed multi-time-scale simulation tool developed in MATLAB includes several distribution circuit components such as voltage sources, distribution lines, transformers, loads, capacitor banks, wind turbines, and PVs. Each equipment model in the proposed simulation tool consists of three models in different time scales, i.e., steady-state, electromechanical transient, and electromagnetic transient models. Therefore, the proposed tool is able to perform a long-term simulation involving power system phenomena spreading across time scales. Because distribution circuits are usually unbalanced, the proposed tool employs distribution circuit models with all three phases represented. The test circuit used to demonstrate the multi-time-scale simulation approach is the IEEE four-node test feeder with wind turbines and PVs connected at the feeder end. The results show that the proposed multi-time-scale simulation tool is able to simulate and analyze long-term power system phenomena spreading across time scales.
Advisors/Committee Members: Santoso, Surya (advisor), Baldick, Ross (committee member), Hallock, Gary A (committee member), Kwasinski, Alexis (committee member), Longoria, Raul G (committee member).
Subjects/Keywords: Distributed power generation; Power system modeling; Power system simulation; Solar power generation; Wind power generation
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APA (6th Edition):
Chirapongsananurak, P. (2016). Distribution circuit multi-time-scale simulation tool for wind turbine and photovoltaic integration analysis. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/68247
Chicago Manual of Style (16th Edition):
Chirapongsananurak, Pisitpol. “Distribution circuit multi-time-scale simulation tool for wind turbine and photovoltaic integration analysis.” 2016. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/68247.
MLA Handbook (7th Edition):
Chirapongsananurak, Pisitpol. “Distribution circuit multi-time-scale simulation tool for wind turbine and photovoltaic integration analysis.” 2016. Web. 13 Apr 2021.
Vancouver:
Chirapongsananurak P. Distribution circuit multi-time-scale simulation tool for wind turbine and photovoltaic integration analysis. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2016. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/68247.
Council of Science Editors:
Chirapongsananurak P. Distribution circuit multi-time-scale simulation tool for wind turbine and photovoltaic integration analysis. [Doctoral Dissertation]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/68247
University of Texas – Austin
21.
-0679-9832.
Uniform positive recurrence and long term behavior of Markov decision processes, with applications in sensor scheduling.
Degree: PhD, Electrical and Computer Engineering, 2015, University of Texas – Austin
URL: http://hdl.handle.net/2152/63871
► In this dissertation, we show a number of new results relating to stability, optimal control, and value iteration algorithms for discrete-time Markov decision processes (MDPs).…
(more)
▼ In this dissertation, we show a number of new results relating to stability, optimal control, and value iteration algorithms for discrete-time Markov decision processes (MDPs). First, we adapt two recent results in controlled diffusion processes to suit countable state MDPs by making assumptions that approximate continuous behavior. We show that if the MDP is stable under any stationary policy, then it must be uniformly so under all policies. This abstract result is very useful in the analysis of optimal control problems, and extends the characterization of uniform stability properties for MDPs. Then we derive two useful local bounds on the discounted value functions for a large class of MDPs, facilitating analysis of the ergodic cost problem via the Arzela-Ascoli theorem. We also examine and exploit the previously underutilized Harnack inequality for discrete Markov chains; one aim of this work was to discover how much can be accomplished for models with this property.
Convergence of the value iteration algorithm is typically treated in the literature under blanket stability assumptions. We show two new sufficient conditions for the convergence of the value iteration algorithm without blanket stability, requiring only geometric ergodicity under the optimal policy. These results form the theoretical basis to apply the value iteration to classes of problems previously unavailable.
We then consider a discrete-time linear system with Gaussian white noise and quadratic costs, observed via multiple sensors that communicate over a congested network. Observations are lost or received according to a Bernoulli random variable with a loss rate determined by the state of the network and the choice of sensor. We completely analyze the finite horizon, discounted, and long-term average optimal control problems. Assuming that the system is stabilizable, we use a partial separation principle to transform the problem into an MDP on the set of symmetric, positive definite matrices. A special case of these results generalizes a known result for Kalman filters with intermittent observations to the multiple-sensor case, with powerful implications.
Finally, we show that the value iteration algorithm converges without additional assumptions, as the structure of the problem guarantees geometric ergodicity under the optimal policy. The results allow the incorporation of adaptive schemes to determine unknown system parameters without affecting stability or long-term average cost. We also show that after only a few steps of the value iteration algorithm, the generated policy is geometrically ergodic and near-optimal.
Advisors/Committee Members: Arapostathis, Ari (advisor), Baldick, Ross (committee member), Caramanis, Constantine (committee member), Grady, Mack (committee member), Longoria, Raul G (committee member).
Subjects/Keywords: Markov decision processes; Uniform recurrence; Harnack's inequality; Ergodic cost; Value iteration; Sensor scheduling; Intermittent observations
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APA ·
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APA (6th Edition):
-0679-9832. (2015). Uniform positive recurrence and long term behavior of Markov decision processes, with applications in sensor scheduling. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/63871
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-0679-9832. “Uniform positive recurrence and long term behavior of Markov decision processes, with applications in sensor scheduling.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/63871.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-0679-9832. “Uniform positive recurrence and long term behavior of Markov decision processes, with applications in sensor scheduling.” 2015. Web. 13 Apr 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-0679-9832. Uniform positive recurrence and long term behavior of Markov decision processes, with applications in sensor scheduling. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/63871.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-0679-9832. Uniform positive recurrence and long term behavior of Markov decision processes, with applications in sensor scheduling. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/63871
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
University of Texas – Austin
22.
Gulati, Shilpa.
A framework for characterization and planning of safe, comfortable, and customizable motion of assistive mobile robots.
Degree: PhD, Mechanical Engineering, 2011, University of Texas – Austin
URL: http://hdl.handle.net/2152/ETD-UT-2011-08-3992
► Assistive mobile robots, such as intelligent wheelchairs, that can navigate autonomously in response to high level commands from a user can greatly benefit people with…
(more)
▼ Assistive mobile robots, such as intelligent wheelchairs, that can navigate autonomously in response to high level commands from a user can greatly benefit people with cognitive and physical disabilities by increasing their mobility. In this work, we address the problem of safe, comfortable, and customizable motion planning of such assistive mobile robots.
We recognize that for an assistive robot to be acceptable to human users, its motion should be safe and comfortable. Further, different users should be able to customize the motion according to their comfort. We formalize the notion of motion comfort as a discomfort measure that can be minimized to compute comfortable trajectories, and identify several properties that a trajectory must have for the motion to be comfortable. We develop a motion planning framework for planning safe, comfortable, and customizable trajectories in small-scale space. This framework removes the limitations of existing methods for planning motion of a wheeled mobile robot moving on a plane, none of which can compute trajectories with all the properties necessary for comfort.
We formulate a discomfort cost functional as a weighted sum of total travel time, time integral of squared tangential jerk, and time integral of squared normal jerk. We then define the problem of safe and comfortable motion planning as that of minimizing this discomfort such that the trajectories satisfy boundary conditions on configuration and its higher derivatives, avoid obstacles, and satisfy constraints on curvature, speed, and acceleration. This description is transformed into a precise mathematical problem statement using a general nonlinear constrained optimization approach. The main idea is to formulate a well-posed infinite-dimensional optimization problem and use a conforming finite-element discretization to transform it into a finite-dimensional problem for a numerical solution.
We also outline a method by which a user may customize the motion and present some guidelines for conducting human user studies to validate or refine the discomfort measure presented in this work.
Results show that our framework is capable of reliably planning trajectories that have all the properties necessary for comfort. We believe that our work is an important first step in developing autonomous assistive robots that are acceptable to human users.
Advisors/Committee Members: Longoria, Raul G. (advisor), Kuipers, Benjamin (advisor), Djurdjanovic, Dragan (committee member), Sreenivasan, S.V. (committee member), Stone, Peter (committee member).
Subjects/Keywords: Assistive robots; Robot motion planning; Safe and comfortable motion planning for wheeled mobile robots
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APA (6th Edition):
Gulati, S. (2011). A framework for characterization and planning of safe, comfortable, and customizable motion of assistive mobile robots. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-08-3992
Chicago Manual of Style (16th Edition):
Gulati, Shilpa. “A framework for characterization and planning of safe, comfortable, and customizable motion of assistive mobile robots.” 2011. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/ETD-UT-2011-08-3992.
MLA Handbook (7th Edition):
Gulati, Shilpa. “A framework for characterization and planning of safe, comfortable, and customizable motion of assistive mobile robots.” 2011. Web. 13 Apr 2021.
Vancouver:
Gulati S. A framework for characterization and planning of safe, comfortable, and customizable motion of assistive mobile robots. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2011. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/ETD-UT-2011-08-3992.
Council of Science Editors:
Gulati S. A framework for characterization and planning of safe, comfortable, and customizable motion of assistive mobile robots. [Doctoral Dissertation]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-08-3992
23.
Niu, Yichuan.
Quantifying and mitigating wind power variability.
Degree: PhD, Electrical and Computer Engineering, 2015, University of Texas – Austin
URL: http://hdl.handle.net/2152/32845
► Understanding variability and unpredictability of wind power is essential for improving power system reliability and energy dispatch in transmission and distribution systems. The research presented…
(more)
▼ Understanding variability and unpredictability of wind power is essential for improving power system reliability and energy dispatch in transmission and distribution systems. The research presented herein intends to address a major challenge in managing and utilizing wind energy with mitigated fluctuation and intermittency. Caused by the varying wind speed, power variability can be explained as power imbalances. These imbalances create power surplus or deficiency in respect to the desired demand. To ameliorate the aforementioned issue, the fluctuating wind energy needs to be properly quantified, controlled, and re-distributed to the grid. The first major study in this dissertations is to develop accurate wind turbine models and model reductions to generate wind power time-series in a laboratory time-efficient manner. Reliable wind turbine models can also perform power control events and acquire dynamic responses more realistic to a real-world condition. Therefore, a Type 4 direct-drive wind turbine with power electronic converters has been modeled and designed with detailed aerodynamic and electric parameters based on a given generator. Later, using averaging and approximation techniques for power electronic circuits, the order of the original model is lowered to boost the computational efficiency for simulating long-term wind speed data. To quantify the wind power time-series, efforts are made to enhance adaptability and robustness of the original conditional range metric (CRM) algorithm that has been proposed by literatures for quantitatively assessing the power variability within a certain time frame. The improved CRM performs better under scarce and noisy time-series data with a reduced computational complexity. Rather than using a discrete probability model, the improved method implements a continuous gamma distribution with parameters estimated by the maximum likelihood estimators. With the leverage from the aforementioned work, a wind farm level behavior can be revealed by analyzing the data through long-term simulations using individual wind turbine models. Mitigating the power variability by reserved generation sources is attempted and the generation scenarios are generalized using an unsupervised machine learning algorithm regarding power correlations of those individual wind turbines. A systematic blueprint for reducing intra-hour power variations via coordinating a fast- and a slow- response energy storage systems (ESS) has been proposed. Methods for sizing, coordination control, ESS regulation, and power dispatch schemes are illustrated in detail. Applying the real-world data, these methods have been demonstrated desirable for reducing short-term wind power variability to an expected level.
Advisors/Committee Members: Santoso, Surya (advisor), Arapostathis, Aristotle (committee member), Baldick, Ross (committee member), Longoria, Raul G. (committee member), Tiwari, Mohit (committee member).
Subjects/Keywords: Wind power variability; Statistics; Conditional range metric; Energy storage system; Wind turbine; Model reduction; Variability mitigation; Probability; Gamma distribution; Bayesian inference
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APA (6th Edition):
Niu, Y. (2015). Quantifying and mitigating wind power variability. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/32845
Chicago Manual of Style (16th Edition):
Niu, Yichuan. “Quantifying and mitigating wind power variability.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/32845.
MLA Handbook (7th Edition):
Niu, Yichuan. “Quantifying and mitigating wind power variability.” 2015. Web. 13 Apr 2021.
Vancouver:
Niu Y. Quantifying and mitigating wind power variability. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/32845.
Council of Science Editors:
Niu Y. Quantifying and mitigating wind power variability. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/32845
24.
Pehlivantürk, Can.
Lossless convexification of quadrotor motion planning with experiments.
Degree: MSin Engineering, Mechanical Engineering, 2014, University of Texas – Austin
URL: http://hdl.handle.net/2152/26388
► This thesis describes a motion planning method that is designed to guide an autonomous quadrotor. The proposed method is based on a novel lossless convexication,…
(more)
▼ This thesis describes a motion planning method that is designed to guide an autonomous quadrotor. The proposed method is based on a novel lossless convexication, which was first introduced in (12), that allows convex representations of many non-convex control constraints, such as that of the quadrotors. The second contribution of this thesis is to include two separate methods to generate path constraints that capture non-convex position constraints. Using the convexied optimal trajectory generation problem with physical and path constraints, an algorithm is developed that generates fuel optimal trajectories given the initial state and desired final state. As a proof of concept, a quadrotor testbed is developed that utilize a state-of-the-art motion tracking system. The quadrotor is commanded via a ground station where the convexified optimal trajectory generation algorithm is successfully implemented together with a trajectory tracking feedback controller.
Advisors/Committee Members: Longoria, Raul G. (advisor), Açıkmeşe, Behçet (advisor).
Subjects/Keywords: Quadrotor; UAV; Trajectory generation; Convexification
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APA (6th Edition):
Pehlivantürk, C. (2014). Lossless convexification of quadrotor motion planning with experiments. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/26388
Chicago Manual of Style (16th Edition):
Pehlivantürk, Can. “Lossless convexification of quadrotor motion planning with experiments.” 2014. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/26388.
MLA Handbook (7th Edition):
Pehlivantürk, Can. “Lossless convexification of quadrotor motion planning with experiments.” 2014. Web. 13 Apr 2021.
Vancouver:
Pehlivantürk C. Lossless convexification of quadrotor motion planning with experiments. [Internet] [Masters thesis]. University of Texas – Austin; 2014. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/26388.
Council of Science Editors:
Pehlivantürk C. Lossless convexification of quadrotor motion planning with experiments. [Masters Thesis]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/26388
25.
Ghasemi, Mahsa.
Synthesis of reactive controllers for reconfigurable networked systems.
Degree: MSin Engineering, Mechanical Engineering, 2017, University of Texas – Austin
URL: http://hdl.handle.net/2152/62937
► Moving toward more autonomous fault-tolerant systems with robustness against unpredicted environment behavior, this thesis defines a set of high-level specifications on an abstract model of…
(more)
▼ Moving toward more autonomous fault-tolerant systems with robustness against unpredicted environment behavior, this thesis defines a set of high-level specifications on an abstract model of a heterogeneous system, composed of a power distribution network and a thermal management network, and proposes two different approaches for designing a reactive controller that satisfies those specifications. The first approach encodes the specifications in linear temporal logic (LTL) while the second one treats the specifications as clauses in a maximum satisfiability (Max-SAT) setting.
To benchmark the schemes, a scaled interconnected model of the power distribution network and the thermal management network is created in MATLAB Simulink where these two methods are individually implemented.
Furthermore, the two controller design methods are compared in terms of their capabilities and their performances are evaluated by conducting multiple simulation scenarios.
Advisors/Committee Members: Topcu, Ufuk (advisor), Longoria, Raul G. (advisor).
Subjects/Keywords: Networked systems; Formal synthesis; Linear temporal logic; Maximum satisfiability
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APA (6th Edition):
Ghasemi, M. (2017). Synthesis of reactive controllers for reconfigurable networked systems. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/62937
Chicago Manual of Style (16th Edition):
Ghasemi, Mahsa. “Synthesis of reactive controllers for reconfigurable networked systems.” 2017. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/62937.
MLA Handbook (7th Edition):
Ghasemi, Mahsa. “Synthesis of reactive controllers for reconfigurable networked systems.” 2017. Web. 13 Apr 2021.
Vancouver:
Ghasemi M. Synthesis of reactive controllers for reconfigurable networked systems. [Internet] [Masters thesis]. University of Texas – Austin; 2017. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/62937.
Council of Science Editors:
Ghasemi M. Synthesis of reactive controllers for reconfigurable networked systems. [Masters Thesis]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/62937
University of Texas – Austin
26.
-4221-291X.
Optimal control of wind turbines for distributed power generation.
Degree: PhD, Mechanical engineering, 2015, University of Texas – Austin
URL: http://hdl.handle.net/2152/31543
► Wind energy represents one of the major renewable energy sources that can meet future energy demands to sustain our lifestyle. During the last few decades,…
(more)
▼ Wind energy represents one of the major renewable energy sources that can meet future energy demands to sustain our lifestyle. During the last few decades, the installation of wind turbines for power generation has grown rapidly worldwide. Besides utility scale wind farms, distributed wind energy systems contributes to the rise in wind energy penetration. However, the expansion of distributed wind energy systems is faced by major challenges such as the system’s reliability in addition to the environmental impacts. This work is intended to explore various control algorithms to enable the distributed wind energy systems to face the aforementioned challenges. First of all, a stall regulated fixed speed wind turbine augmented with a variable ratio gearbox has been proven to enhance the wind energy capture at a relatively low cost, and considered as an attractive design for small wind energy systems. However, the high reliability advantage of traditional fixed-speed wind turbines can be affected by the integration of the variable ratio gearbox. A portion of this work is intended to develop a control algorithm that extends the variable ratio gearbox service life, thus improves overall system reliability and reduces the expected operational cost. Secondly, a pitch regulated variable speed wind turbines dominates the wind energy industry as it represents a balance between cost and flexibility of operation. They can be used for midsized wind power generation. Optimizing its wind energy capture while maintain high system reliability has been the one of the main focuses of many researchers. Another portion of this work introduces a model predictive control framework that enhances the reliability of pitch regulated variable speed wind turbines, thus improves their operational cost. Finally, one of the major environmental challenges facing the continuous growth of wind energy industry is the noise emitted from wind turbines. The severity of the noise emission problem is more significant for small and medium sized wind turbines installed in the vicinity of residential areas for distributed power generation. Consequently, the last portion of this work is intended to investigate the potential of wind turbine control design to reduce noise emission in different operating conditions with minimal impact on power generation
Advisors/Committee Members: Chen, Dongmei, Ph. D. (advisor), Longoria, Raul G. (committee member), Crawford, Richard H. (committee member), Deshpande, Ashish D. (committee member), Malikopoulos, Andreas A. (committee member), Pratap, Siddharth B. (committee member).
Subjects/Keywords: Wind energy; Optimal control; Energy maximization; Fatigue load mitigation; Noise emission reduction
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APA (6th Edition):
-4221-291X. (2015). Optimal control of wind turbines for distributed power generation. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/31543
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-4221-291X. “Optimal control of wind turbines for distributed power generation.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/31543.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-4221-291X. “Optimal control of wind turbines for distributed power generation.” 2015. Web. 13 Apr 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-4221-291X. Optimal control of wind turbines for distributed power generation. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/31543.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-4221-291X. Optimal control of wind turbines for distributed power generation. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/31543
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
University of Texas – Austin
27.
Lee, Sangyup.
Nonholonomic Hamiltonian method for multiscale simulation of reacting shock physics.
Degree: PhD, Mechanical Engineering, 2017, University of Texas – Austin
URL: http://hdl.handle.net/2152/62166
► Multiscale methods which are systematic, computationally efficient, and applicable to a wide range of materials are needed to augment experimental research in the development of…
(more)
▼ Multiscale methods which are systematic, computationally efficient, and applicable to a wide range of materials are needed to augment experimental research in the development of improved explosives and propellants. A variety of modeling methods have been applied to detonation simulation, but different model formulation techniques are normally used at each scale. This research has developed the first unified discrete Hamiltonian approach to multiscale simulation of reacting shock physics, using a nonholonomic methodology. The method incorporates general material and geometric nonlinearities, which are of central interest in reacting shock modeling applications.
A new synchronous multiscale model has been formulated, which incorporates a macroscale Lagrangian particle-element model, a mesoscale Lagrangian finite element model, and a Lagrangian reacting molecular dynamics model. A new asynchronous multiscale model has been formulated, which incorporates a macroscale Eulerian finite element model, a mesoscale Lagrangian particle-element model, and a Lagrangian reacting molecular dynamics model. The asynchronous model includes new strategies to accommodate the large time and space disparities between scales, and has been validated in simulations which model shock to detonation in two widely used explosives.
Advisors/Committee Members: Fahrenthold, Eric P. (advisor), Bryant, Michael D. (committee member), Foster, John T. (committee member), Longoria, Raul G. (committee member), Taleff, Eric M. (committee member).
Subjects/Keywords: Multiscale simulation; Shock to detonation; Nonholonomic Hamiltonian
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APA (6th Edition):
Lee, S. (2017). Nonholonomic Hamiltonian method for multiscale simulation of reacting shock physics. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/62166
Chicago Manual of Style (16th Edition):
Lee, Sangyup. “Nonholonomic Hamiltonian method for multiscale simulation of reacting shock physics.” 2017. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/62166.
MLA Handbook (7th Edition):
Lee, Sangyup. “Nonholonomic Hamiltonian method for multiscale simulation of reacting shock physics.” 2017. Web. 13 Apr 2021.
Vancouver:
Lee S. Nonholonomic Hamiltonian method for multiscale simulation of reacting shock physics. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2017. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/62166.
Council of Science Editors:
Lee S. Nonholonomic Hamiltonian method for multiscale simulation of reacting shock physics. [Doctoral Dissertation]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/62166
University of Texas – Austin
28.
-3146-1283.
Modeling, estimation, and control of proton exchange membrane-based electrochemical systems.
Degree: PhD, Mechanical Engineering, 2015, University of Texas – Austin
URL: http://hdl.handle.net/2152/32873
► To reduce emissions and meet the rapidly growing global energy demand, affordable and efficient methods of electrical energy storage and generation are needed to exploit…
(more)
▼ To reduce emissions and meet the rapidly growing global energy demand, affordable and efficient methods of electrical energy storage and generation are needed to exploit renewable energy sources more effectively. Proton exchange membrane (PEM) based electrochemical systems, such as vanadium redox flow batteries (VRFB) and PEM fuel cells, are playing an increasingly important role because they have a fast response rate, high efficiency, and small environmental impact. However, widespread commercial viability of these technologies in the future heavily depends on further improvements in their performance and reliability. Accordingly, this dissertation focuses on developing new methodologies to predict and control the behavior of these PEM-based electrochemical systems. In the first part of this work, a control-oriented physics-based model of a VRFB system is developed. This model can predict the transient response of the cell voltage under different operating conditions and inputs such as current, flow rate, and temperature. The significance of this study is having the ability to predict the short and long term effects of membrane crossover on the system performance. One major challenge of operating VRFB systems is that monitoring the state-of-charge (SOC) in real-time using traditional measurement techniques is expensive and impractical. To address this problem, an SOC estimator is developed based on a constrained extended Kalman filter that can be used for real-time optimization and control because it requires only simple voltage measurements and a low-order model. Simulation results demonstrate the ability to predict the vanadium concentrations of a VRFB system without knowledge of the crossover dynamics. A major obstacle preventing the widespread commercialization of VRFBs is excessive capital costs. This issue is addressed by developing a methodology to optimally size a VRFB system using the minimum amount of materials required for the intended power range. For PEM fuel cells, proper water and thermal management is critical to optimizing performance and longevity. However, this can be a challenging task due to strong system interactions between multiple input and output variables. In the final part of this work, these system interactions are studied in detail and a suitable controller is designed to regulate the stack voltage, stack temperature, and relative humidity during load transients.
Advisors/Committee Members: Chen, Dongmei, Ph. D. (advisor), Longoria, Raul G (committee member), Deshpande, Ashish D (committee member), Fahrenthold, Eric P (committee member), Edgar, Thomas F (committee member).
Subjects/Keywords: Modeling; Estimation; Control; Flow battery; PEM fuel cell
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APA (6th Edition):
-3146-1283. (2015). Modeling, estimation, and control of proton exchange membrane-based electrochemical systems. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/32873
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-3146-1283. “Modeling, estimation, and control of proton exchange membrane-based electrochemical systems.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/32873.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-3146-1283. “Modeling, estimation, and control of proton exchange membrane-based electrochemical systems.” 2015. Web. 13 Apr 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-3146-1283. Modeling, estimation, and control of proton exchange membrane-based electrochemical systems. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/32873.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-3146-1283. Modeling, estimation, and control of proton exchange membrane-based electrochemical systems. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/32873
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
29.
-9266-5223.
Modeling and control of an adaptive tire-inflation system based on in-tire sensing feedback.
Degree: MSin Engineering, Mechanical Engineering, 2018, University of Texas – Austin
URL: http://hdl.handle.net/2152/64125
► Tire contact area is an important feature that influences the performance of a ground wheeled vehicle, especially on soft terrain. This thesis evaluates a system…
(more)
▼ Tire contact area is an important feature that influences the performance of a ground wheeled vehicle, especially on soft terrain. This thesis evaluates a system meant to control tire-surface contact area by inflating and deflating the tire while the vehicle is in motion. The system includes a measurement of the vertical deflection of the tire using ultrasonic distance sensors, from which tire-surface contact area can be inferred from a model basis. In order to validate the concept and determine limits on such a system, a model and simulation of a controlled system has been developed. For the purposes of this study, it is assumed that the tire is operating on a hard (i.e., non-deformable) terrain, the contact area is elliptical, and the tire deflection can
be predicted by a 1-D stiffness model. The system was evaluated using three
driving scenarios, namely a change in terrain stiffness, changes in vertical applied load, and pressure changes in the tire due to change in temperature. It is shown that inflating and deflating the tire is effective in making up for changes in driving condition. The influence of sensor response characteristics, such as time delay and noise, were also included in the simulation and evaluated. The time delay was estimated based on the time to obtain the deflection based on
the period of the wheel spin; the influence of the time delay can be minimized by changing the proportional and integral gains. The results also suggest that the system is actually robust to the influence of noise. Some suggestions for future work on this problem are provided.
Advisors/Committee Members: Longoria, Raul G. (advisor), Chen, Dongmei (committee member).
Subjects/Keywords: Tire contact area; Ultrasonic sensor; Tire deflection; Matlab; Simulink
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APA (6th Edition):
-9266-5223. (2018). Modeling and control of an adaptive tire-inflation system based on in-tire sensing feedback. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/64125
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-9266-5223. “Modeling and control of an adaptive tire-inflation system based on in-tire sensing feedback.” 2018. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/64125.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-9266-5223. “Modeling and control of an adaptive tire-inflation system based on in-tire sensing feedback.” 2018. Web. 13 Apr 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-9266-5223. Modeling and control of an adaptive tire-inflation system based on in-tire sensing feedback. [Internet] [Masters thesis]. University of Texas – Austin; 2018. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/64125.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-9266-5223. Modeling and control of an adaptive tire-inflation system based on in-tire sensing feedback. [Masters Thesis]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/64125
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
30.
Campbell, Etse-Oghena Yetunde.
An evaluation and redesign of a vision-based feedback controls experiment for undergraduate dynamic systems and controls laboratory.
Degree: MSin Engineering, Mechanical Engineering, 2017, University of Texas – Austin
URL: http://hdl.handle.net/2152/54119
► Control systems instructional modules are more commonly developed for control systems engineering students, who are prepared to confront the complexity and large number of topics…
(more)
▼ Control systems instructional modules are more commonly developed for control systems engineering students, who are prepared to confront the complexity and large number of topics and concepts required in control systems study. In a general systems and dynamics course, it can be challenging to develop laboratory modules that will be suitable to, say, a general mechanical engineering student audience. This report describes and analyzes a pedagogical tool – a Vision-Based feedback control experiment – to investigate its effectiveness at demonstrating basic feedback control concepts to such a general purpose mechanical engineering undergraduate student audience. The effectiveness of this tool is examined by analyzing student responses to specific queries, designed to test understanding of a topic area or concept. This report evaluates the experimental apparatus pedagogical practice to give the instructor information required for an update on aforementioned practices, to better suit the target student audience, and to ultimately achieve desired module learning outcomes and objectives. The evaluation tools and methods are described in detail, and results show that the Vision-Based Feedback Control Experimental apparatus successfully demonstrates feedback control concepts to the desired student audience, and highlights areas where teaching practice may be improved to improve student comprehension of the concepts and topics presented in the module. The tools and methods presented in this report can be implemented for constantly monitoring the effect of changes and improvements, and are recommended for application to any of the other instructional lab modules in this type of course.
Advisors/Committee Members: Longoria, Raul G. (advisor), Li, Wei (committee member).
Subjects/Keywords: Feedback control; Vision-based feedback; Engineering education; Instructional laboratories; Engineering
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APA ·
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MLA ·
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APA (6th Edition):
Campbell, E. Y. (2017). An evaluation and redesign of a vision-based feedback controls experiment for undergraduate dynamic systems and controls laboratory. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/54119
Chicago Manual of Style (16th Edition):
Campbell, Etse-Oghena Yetunde. “An evaluation and redesign of a vision-based feedback controls experiment for undergraduate dynamic systems and controls laboratory.” 2017. Masters Thesis, University of Texas – Austin. Accessed April 13, 2021.
http://hdl.handle.net/2152/54119.
MLA Handbook (7th Edition):
Campbell, Etse-Oghena Yetunde. “An evaluation and redesign of a vision-based feedback controls experiment for undergraduate dynamic systems and controls laboratory.” 2017. Web. 13 Apr 2021.
Vancouver:
Campbell EY. An evaluation and redesign of a vision-based feedback controls experiment for undergraduate dynamic systems and controls laboratory. [Internet] [Masters thesis]. University of Texas – Austin; 2017. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/2152/54119.
Council of Science Editors:
Campbell EY. An evaluation and redesign of a vision-based feedback controls experiment for undergraduate dynamic systems and controls laboratory. [Masters Thesis]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/54119
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Open Access Theses and Dissertations
