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University of Houston
1.
Meziou, Amine.
Low-Dimensional Modeling of Two-Phase Flow in Pipelines.
Degree: PhD, Mechanical Engineering, 2017, University of Houston
URL: http://hdl.handle.net/10657/4623 
► Multiphase flow in pipelines is an ubiquitous part of any oil and gas production system. Developing fast, yet accurate multiphase flow models having utility in…
(more)
▼ Multiphase flow in pipelines is an ubiquitous part of any oil and gas production system. Developing fast, yet accurate multiphase flow models having utility in system design, control design, and system health-monitoring is therefore an important engineering and scientific challenge, particularly when the pipelines are parts of a complex subsea architecture.
Presented in this dissertation are multi-physics reduced-order fluid and thermal models of one-dimensional transient two-phase flow in pipelines. The proposed fluid model is comprised of a steady state multiphase flow mechanistic model in series with a transient reduced-order single-phase flow model. The low-dimensional model parameters are realized by developing equivalent fluid properties (i.e., viscosity, density and bulk modulus) that are a function of the flow pattern, steady-state pressure gradient, and liquid holdup identified through the mechanistic model. The fluid model is then coupled with a two-phase flow heat transfer model via a multi-physics integration block used to update the fluid properties along the pipeline based on the predicted pressure and temperature conditions. The model ability to reproduce the dynamics of multiphase flow in pipes is first evaluated upon comparison to OLGA. The two models show a good agreement of the steady-state response and the period of oscillation indicating a similar estimation of the pipeline natural frequency. However, they present a discrepancy in the overshoot values and the settling time due to a difference in the calculated damping ratio. Both models are then compared to transient two-phase flow data collected at the National
University of Singapore flow loop. It is concluded that the low-dimensional model is characterized by a superior overall performance when compared to OLGA. The developed model accuracy improves when considering a higher order but is associated with a higher simulation time. The established multi-physics models are used for the design, modeling, simulation, and optimization of multiple-wells subsea architectures with a High Integrity Pressure Protection System (HIPPS) as an alternative to reduce the subsea capital expenditure (CAPEX).
The utility of the developed low-dimensional models is the reduced computational burden of estimating transient multiphase flow in pipelines, thereby enabling real-time estimation of pressure, temperature, and flow rate.
Advisors/Committee Members: Franchek, Matthew A. (advisor), Grigoriadis, Karolos M. (committee member), Song, Gangbing (committee member), Nikolaou, Michael (committee member), Provence, Robert S. (committee member).
Subjects/Keywords: Multi-phase flow; Pipelines; Transient; Steady-state; Subsea; Fluid dynamics; Thermal
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APA (6th Edition):
Meziou, A. (2017). Low-Dimensional Modeling of Two-Phase Flow in Pipelines. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/4623
Chicago Manual of Style (16th Edition):
Meziou, Amine. “Low-Dimensional Modeling of Two-Phase Flow in Pipelines.” 2017. Doctoral Dissertation, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/4623.
MLA Handbook (7th Edition):
Meziou, Amine. “Low-Dimensional Modeling of Two-Phase Flow in Pipelines.” 2017. Web. 19 Jan 2021.
Vancouver:
Meziou A. Low-Dimensional Modeling of Two-Phase Flow in Pipelines. [Internet] [Doctoral dissertation]. University of Houston; 2017. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/4623.
Council of Science Editors:
Meziou A. Low-Dimensional Modeling of Two-Phase Flow in Pipelines. [Doctoral Dissertation]. University of Houston; 2017. Available from: http://hdl.handle.net/10657/4623
University of Houston
2.
Gampa, Ravishanker Venkata.
Powering Particle Accelerators.
Degree: MS, Mechanical Engineering, 2017, University of Houston
URL: http://hdl.handle.net/10657/4544
► This thesis considers the design of power supplies for the magnetic and electrical dipoles used in typical particle accelerators. First the thermoelectric current generation system…
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▼ This thesis considers the design of power supplies for the magnetic and electrical dipoles used in typical particle accelerators. First the thermoelectric current generation system is studied, its high current, low voltage properties as they apply to the power supply for a superconducting coil magnet are presented and results of experiments to characterize the thermoelectric modules are explained. Subsequently, the design of a high voltage, low current power supply is developed from the concept of a high voltage multiplier and the results of simulation in SPICE of the design for performance analysis are presented.
Advisors/Committee Members: Masson, Philippe J. (advisor), Provence, Robert S. (committee member), Kulkarni, Yashashree (committee member).
Subjects/Keywords: Thermoelectric module; Power supply; High voltage low current; High current low voltage; Electric dipole; Magnetic dipole; Superconductivity
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APA (6th Edition):
Gampa, R. V. (2017). Powering Particle Accelerators. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/4544
Chicago Manual of Style (16th Edition):
Gampa, Ravishanker Venkata. “Powering Particle Accelerators.” 2017. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/4544.
MLA Handbook (7th Edition):
Gampa, Ravishanker Venkata. “Powering Particle Accelerators.” 2017. Web. 19 Jan 2021.
Vancouver:
Gampa RV. Powering Particle Accelerators. [Internet] [Masters thesis]. University of Houston; 2017. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/4544.
Council of Science Editors:
Gampa RV. Powering Particle Accelerators. [Masters Thesis]. University of Houston; 2017. Available from: http://hdl.handle.net/10657/4544
University of Houston
3.
Kotti, Radhakrishna.
An Integrated Approach to Maximize Efficiency and Reliability of Grid Connected Distributed Energy Sources.
Degree: PhD, Electrical Engineering, 2014, University of Houston
URL: http://hdl.handle.net/10657/5679
► The emergence of local-generation as a technically sound solution for the reliability concerns of the existing power grid has lead in recent times to the…
(more)
▼ The emergence of local-generation as a technically sound solution for the reliability concerns of the existing power grid has lead in recent times to the concept of microgrid. The microgrid is a network of low-voltage (LV) interconnected loads and distributed-energy resources (DERs) with clearly-defined electrical boundaries. The distributed generation majority rely on either photovoltaic (PV) or wind turbines producing imperfectly-predictable variable power, making it harder for the system operators to match generation and load at every instant. This has created a significant interest in optimal grid integration and control of DER units in terms of efficiency maximization and cost minimization by implementing maximum power point tracking (MPPT) control.
A new scanning method of MPPT control for grid-connected PV systems is proposed and studied. This technique displays high tracking efficiency with low tracking time. The control tracks the global maxima under partial shading conditions and provides a non-oscillatory response under steady-state operation. The performance of the proposed control is compared with perturb and observe (P&O) and incremental conductance (INC) control under varying operating conditions. The simulation and experimental results clearly prove the effectiveness of the proposed MPPT control.
For wind energy conversion systems (WECS) a new adaptive sensor-less MPPT control is proposed. The controller overcomes the trade-off between step size and tracking accuracy, providing a fast tracking response along with avoiding the inconsistent generator-converter efficiency problems. The performance of the proposed control is validated through simulation and experimental results in comparison with P&O MPPT control under varying wind conditions.
The DERs are connected to the microgrid with the help of power electronics interface such as AC-DC, DC-DC and DC-AC converters. The DC-DC and DC-AC converters are coupled with the help of large electrolytic capacitors. The reliability of the system is maximized by reducing the required DC link capacitance and replacing the electrolytic capacitors with high cost and reliable film capacitors. A new DC link reduction control to reduce the required DC link capacitance is proposed. The performance of the proposed control is validated through simulation results for grid connected PV and WECS under reduced DC link capacitance.
Advisors/Committee Members: Shireen, Wajiha (advisor), Malki, Heidar A. (committee member), Cline, Raymond E., Jr. (committee member), Provence, Robert S. (committee member), Barati, Masoud (committee member).
Subjects/Keywords: MPPT; DC-Link Reduction Control
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APA (6th Edition):
Kotti, R. (2014). An Integrated Approach to Maximize Efficiency and Reliability of Grid Connected Distributed Energy Sources. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/5679
Chicago Manual of Style (16th Edition):
Kotti, Radhakrishna. “An Integrated Approach to Maximize Efficiency and Reliability of Grid Connected Distributed Energy Sources.” 2014. Doctoral Dissertation, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/5679.
MLA Handbook (7th Edition):
Kotti, Radhakrishna. “An Integrated Approach to Maximize Efficiency and Reliability of Grid Connected Distributed Energy Sources.” 2014. Web. 19 Jan 2021.
Vancouver:
Kotti R. An Integrated Approach to Maximize Efficiency and Reliability of Grid Connected Distributed Energy Sources. [Internet] [Doctoral dissertation]. University of Houston; 2014. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/5679.
Council of Science Editors:
Kotti R. An Integrated Approach to Maximize Efficiency and Reliability of Grid Connected Distributed Energy Sources. [Doctoral Dissertation]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/5679
University of Houston
4.
Dam, Duy K.
Analysis and Control of a Non-linear Flight Vehicle.
Degree: MS, Computer and Systems Engineering, 2014, University of Houston
URL: http://hdl.handle.net/10657/5671
► Unmanned flight vehicles have received considerable attention from researchers in multiple areas. They can be used as a research platform to evaluate new concepts in…
(more)
▼ Unmanned flight vehicles have received considerable attention from researchers in multiple areas. They can be used as a research platform to evaluate new concepts in different fields including control theory, real-time system, robotics, and navigation. One of the most typical designs for unmanned flight vehicle is Quadcopter. Although quadcopters are mechanically simple, controlling them is a challenging task because the system is highly non-linear and unstable.
In this thesis, the mathematical model of a basic quadcopter is presented. Full State Feedback control method and PID control method are proposed and applied to the quadcopter model. In order to verify the effectiveness of the designed controller, a simulation is also provided. The results show that both controllers can be both effective with a good set of initial parameters.
Advisors/Committee Members: Markenscoff, Pauline (advisor), Provence, Robert S. (committee member), Chen, Yuhua (committee member).
Subjects/Keywords: Analysis; Controls; Quadcopter; Flight vehicles
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APA (6th Edition):
Dam, D. K. (2014). Analysis and Control of a Non-linear Flight Vehicle. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/5671
Chicago Manual of Style (16th Edition):
Dam, Duy K. “Analysis and Control of a Non-linear Flight Vehicle.” 2014. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/5671.
MLA Handbook (7th Edition):
Dam, Duy K. “Analysis and Control of a Non-linear Flight Vehicle.” 2014. Web. 19 Jan 2021.
Vancouver:
Dam DK. Analysis and Control of a Non-linear Flight Vehicle. [Internet] [Masters thesis]. University of Houston; 2014. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/5671.
Council of Science Editors:
Dam DK. Analysis and Control of a Non-linear Flight Vehicle. [Masters Thesis]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/5671
5.
Wu, Tingcheng.
DESIGN AND ANALYSIS OF THE ROTOR OF A FULLY SUPERCONDUCTING MACHINE.
Degree: MS, Mechanical Engineering, 2014, University of Houston
URL: http://hdl.handle.net/10657/1454
► Because of their very high specific torque, fully superconducting rotating machines are considered as enabling technology for future turbo-electric propulsion for transportation aircraft. NASA is…
(more)
▼ Because of their very high specific torque, fully superconducting rotating machines are considered as enabling technology for future turbo-electric propulsion for transportation aircraft. NASA is funding the development of a high fidelity fully superconducting machine sizing tool able to generate optimized designs based on power requirements and design constraints.
In this thesis, a mechanical model of a rotor of fully superconducting motor with 4MW Power and 5000 RPM speed is designed. The model developed includes a realistic 3D geometry representation and is based on parametric design methods. COMSOL MultiPhysics has been used to validate the mechanical calculations including the thermal stress, strain, displacement and torque induced stress and deformation. This parametric model allows us to get the relationship between stress/strain and a series of parameters. This will help define the most proper materials and topology considering different required working conditions. The simulations allowed for a full characterization of the superconducting motor composite shaft and successfully validated the analytical estimation of the stress and deformation of the shaft and stator during cool down and under the effect of the applied torque.
Advisors/Committee Members: Masson, Philippe J. (advisor), Song, Gangbing (committee member), Provence, Robert S. (committee member), Yu, Cunjiang (committee member).
Subjects/Keywords: Fully superconducting machine; Design; ANALYZE
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APA (6th Edition):
Wu, T. (2014). DESIGN AND ANALYSIS OF THE ROTOR OF A FULLY SUPERCONDUCTING MACHINE. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/1454
Chicago Manual of Style (16th Edition):
Wu, Tingcheng. “DESIGN AND ANALYSIS OF THE ROTOR OF A FULLY SUPERCONDUCTING MACHINE.” 2014. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/1454.
MLA Handbook (7th Edition):
Wu, Tingcheng. “DESIGN AND ANALYSIS OF THE ROTOR OF A FULLY SUPERCONDUCTING MACHINE.” 2014. Web. 19 Jan 2021.
Vancouver:
Wu T. DESIGN AND ANALYSIS OF THE ROTOR OF A FULLY SUPERCONDUCTING MACHINE. [Internet] [Masters thesis]. University of Houston; 2014. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/1454.
Council of Science Editors:
Wu T. DESIGN AND ANALYSIS OF THE ROTOR OF A FULLY SUPERCONDUCTING MACHINE. [Masters Thesis]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1454
University of Houston
6.
Arcot, Mrinalini.
Attitude determination of GPS satellite vehicles.
Degree: MS, Engineering Technology, 2014, University of Houston
URL: http://hdl.handle.net/10657/1455
► There is an increasing demand for navigation systems that has led to rapid development of Global Positioning System (GPS) across industries. Apart from position and…
(more)
▼ There is an increasing demand for navigation systems that has led to rapid development of Global Positioning System (GPS) across industries. Apart from position and speed, precise attitude measurements are needed for many GPS applications. This thesis presents techniques for attitude determination of satellite vehicles in both real-time and stand-alone positioning applications. The GPS system used is a differential GPS system that estimates the body frame baselines using at least four receivers. The attitude information is obtained using these baselines and projecting them onto a local level frame. Integer ambiguity is a major constraint in attitude determination. Least Squares Ambiguity Deco-relation method is implemented to fix the ambiguities prior to baseline estimation. Estimation techniques such as Least Squares and Kalman Filter are implemented for deriving baseline components. Finally, this system will compute body frame coordinates and attitude components in reference to the desired coordinate frames.
Advisors/Committee Members: Malki, Heidar A. (advisor), Provence, Robert S. (committee member), Shireen, Wajiha (committee member).
Subjects/Keywords: GPS; Attitudes; LAMBDA; Integer ambiguity; Attitude determination
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APA (6th Edition):
Arcot, M. (2014). Attitude determination of GPS satellite vehicles. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/1455
Chicago Manual of Style (16th Edition):
Arcot, Mrinalini. “Attitude determination of GPS satellite vehicles.” 2014. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/1455.
MLA Handbook (7th Edition):
Arcot, Mrinalini. “Attitude determination of GPS satellite vehicles.” 2014. Web. 19 Jan 2021.
Vancouver:
Arcot M. Attitude determination of GPS satellite vehicles. [Internet] [Masters thesis]. University of Houston; 2014. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/1455.
Council of Science Editors:
Arcot M. Attitude determination of GPS satellite vehicles. [Masters Thesis]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1455
University of Houston
7.
Coskun, Serdar.
Linear Parameter Varying Control of Time-Delayed Systems and an Application to Air-Fuel Ratio Control.
Degree: MS, Mechanical Engineering, 2014, University of Houston
URL: http://hdl.handle.net/10657/1947
► In this thesis one of the recently developed gain scheduling control methods, the linear parameter varying (LPV) technique is demonstrated. Starting from the basic definitions…
(more)
▼ In this thesis one of the recently developed gain scheduling control methods, the linear parameter varying (LPV) technique is demonstrated. Starting from the basic definitions of an LMI, important derivations of time delayed control design conditions are derived. In subsequent steps, a motivating example is shown such that the stability and performance of the system is guaranteed in the full operating envelope.
The thesis consists of methods and derivations to address time-delayed LPV plants. The synthesis conditions show that the proposed controllers are not only capable of compensating the delay bound but also its rate variation bound. A main benefit of the obtained controllers is that the scheduling of the parameters lead to a robust behavior even for large delay variation and rate. Numerical examples are used to compare the past methods and the current results on the analysis and control design of the same system.
Finally the internal combustion engine air-fuel ratio problem is investigated with the help of the derived output-feedback controller design results. The same problem is addressed with a Smith Predictor based Internal Model Control technique to satisfy desired transient and steady-state response characteristics. The LPV control shows better performance compared to the IMC method for small values of the delay. Simulations are used to evaluate the results for larger values of the delay. For large values of the delay the bounds on the Lyapunov –Krasovskii approach introduce some conservatism in the control design and thus, performance specifications are compromised.
Advisors/Committee Members: Grigoriadis, Karolos M. (advisor), Franchek, Matthew A. (committee member), Provence, Robert S. (committee member).
Subjects/Keywords: Linear parameter varying (LPV) systems; Time-Delayed Systems
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APA (6th Edition):
Coskun, S. (2014). Linear Parameter Varying Control of Time-Delayed Systems and an Application to Air-Fuel Ratio Control. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/1947
Chicago Manual of Style (16th Edition):
Coskun, Serdar. “Linear Parameter Varying Control of Time-Delayed Systems and an Application to Air-Fuel Ratio Control.” 2014. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/1947.
MLA Handbook (7th Edition):
Coskun, Serdar. “Linear Parameter Varying Control of Time-Delayed Systems and an Application to Air-Fuel Ratio Control.” 2014. Web. 19 Jan 2021.
Vancouver:
Coskun S. Linear Parameter Varying Control of Time-Delayed Systems and an Application to Air-Fuel Ratio Control. [Internet] [Masters thesis]. University of Houston; 2014. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/1947.
Council of Science Editors:
Coskun S. Linear Parameter Varying Control of Time-Delayed Systems and an Application to Air-Fuel Ratio Control. [Masters Thesis]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1947
University of Houston
8.
Janakiraman, Shyam.
AN ADAPTIVE SENSORLESS CONTROL FOR MAXIMUM POWER POINT TRACKING IN WIND ENERGY CONVERSION SYSTEM.
Degree: MSin Electrical Engineering, Electrical Engineering, 2014, University of Houston
URL: http://hdl.handle.net/10657/1398
► This thesis presents a novel mechanical sensorless adaptive control algorithm for Maximum Power Point Tracking (MPPT) in Wind Energy Conversion Systems (WECS). The proposed control…
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▼ This thesis presents a novel mechanical sensorless adaptive control algorithm for Maximum Power Point Tracking (MPPT) in Wind Energy Conversion Systems (WECS). The proposed control algorithm allows the generator to track the optimal operation points of the wind turbine system under fluctuating wind conditions using an efficient two-step process. This algorithm does not require the knowledge of turbine mechanical characteristics such as its power coefficient curve, power or torque characteristic. The proposed control algorithm is simulated in PSCAD/EMTDC. This thesis also aims at designing a scaled laboratory prototype that is necessary to replicate the characteristics of a wind turbine for any wind speed in a controlled test environment without depending on natural wind resources and actual wind turbine. The Wind Turbine Test Bench System (WTTBS) uses an induction motor as a prime mover to replicate the behavior of a wind turbine shaft. The brain of WTTBS is a Digital Signal Processor (DSP) based algorithm which controls the motor. The simulations for the test bench system were carried out in MATLAB/SIMULINK and PSCAD/EMTDC. Test bench system is prototyped using a TI TMS320F28069M.
Advisors/Committee Members: Shireen, Wajiha (advisor), Charlson, Earl J. (committee member), Provence, Robert S. (committee member).
Subjects/Keywords: MPPT; Wind Turbine Emulator
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APA (6th Edition):
Janakiraman, S. (2014). AN ADAPTIVE SENSORLESS CONTROL FOR MAXIMUM POWER POINT TRACKING IN WIND ENERGY CONVERSION SYSTEM. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/1398
Chicago Manual of Style (16th Edition):
Janakiraman, Shyam. “AN ADAPTIVE SENSORLESS CONTROL FOR MAXIMUM POWER POINT TRACKING IN WIND ENERGY CONVERSION SYSTEM.” 2014. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/1398.
MLA Handbook (7th Edition):
Janakiraman, Shyam. “AN ADAPTIVE SENSORLESS CONTROL FOR MAXIMUM POWER POINT TRACKING IN WIND ENERGY CONVERSION SYSTEM.” 2014. Web. 19 Jan 2021.
Vancouver:
Janakiraman S. AN ADAPTIVE SENSORLESS CONTROL FOR MAXIMUM POWER POINT TRACKING IN WIND ENERGY CONVERSION SYSTEM. [Internet] [Masters thesis]. University of Houston; 2014. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/1398.
Council of Science Editors:
Janakiraman S. AN ADAPTIVE SENSORLESS CONTROL FOR MAXIMUM POWER POINT TRACKING IN WIND ENERGY CONVERSION SYSTEM. [Masters Thesis]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1398
University of Houston
9.
Khoury, George Charles.
Analyzing the Effects of Force Variations on Expanded Residual Damage Detection using Load Dependent Ritz Vectors.
Degree: MS, Mechanical Engineering, 2014, University of Houston
URL: http://hdl.handle.net/10657/1388
► Many non-destructive damage detection problems are presented with the challenge where limited sensor sets allow the measurement of fewer degrees of freedom than the analytical…
(more)
▼ Many non-destructive damage detection problems are presented with the challenge where limited sensor sets allow the measurement of fewer degrees of freedom than the analytical model. This study utilized damage residual expansion methods to determine the overall structural damage locations with reduced sensor sets. The new methods presented were the Modified Method of Expanded Dynamic Residuals and the Dot Product Damage Residual Expansion Method. Ritz vectors were also used with various sensor placement techniques to modify the sensor sets and focus the damage detection capabilities towards elements of interest. The results showed that the modified damage residual expansion methods were able to locate the damaged elements, while also simplifying the selection process, by employing the dot product method and the elemental disassembly. Additionally, the sensor set variations effectively focused the damage detection results towards elements of interest by modifying the Ritz vector loadings.
Advisors/Committee Members: Franchek, Matthew A. (advisor), Grigoriadis, Karolos M. (committee member), Provence, Robert S. (committee member), Masson, Philippe J. (committee member).
Subjects/Keywords: Damage Detection; Minimum Rank Perturbation Theory; Damage Residuals; Method of Expanded Dynamic Residuals; Modified Method of Expanded Dynamic Residuals; Dot Product Damage Residual Expansion Method; Ritz Vectors
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APA (6th Edition):
Khoury, G. C. (2014). Analyzing the Effects of Force Variations on Expanded Residual Damage Detection using Load Dependent Ritz Vectors. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/1388
Chicago Manual of Style (16th Edition):
Khoury, George Charles. “Analyzing the Effects of Force Variations on Expanded Residual Damage Detection using Load Dependent Ritz Vectors.” 2014. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/1388.
MLA Handbook (7th Edition):
Khoury, George Charles. “Analyzing the Effects of Force Variations on Expanded Residual Damage Detection using Load Dependent Ritz Vectors.” 2014. Web. 19 Jan 2021.
Vancouver:
Khoury GC. Analyzing the Effects of Force Variations on Expanded Residual Damage Detection using Load Dependent Ritz Vectors. [Internet] [Masters thesis]. University of Houston; 2014. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/1388.
Council of Science Editors:
Khoury GC. Analyzing the Effects of Force Variations on Expanded Residual Damage Detection using Load Dependent Ritz Vectors. [Masters Thesis]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1388
University of Houston
10.
Ramezanifar, Amin 1981-.
Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay.
Degree: PhD, Mechanical Engineering, 2013, University of Houston
URL: http://hdl.handle.net/10657/1381
► In this dissertation we address a variety of problems in filtering and control of dynamic systems with emphasis on their digital implementation. We focus on…
(more)
▼ In this dissertation we address a variety of problems in filtering and control of dynamic systems with emphasis on their digital implementation. We focus on linear parameter varying (LPV) systems which have been widely utilized in engineering applications. LPV systems include a class of linear systems whose dynamic depends on time-varying parameters. These systems have resulted in significant improvements in the study of time-varying and nonlinear systems.
In a filtering problem, we aim to estimate the states of a dynamic system by utilizing the output measurement of the system. Applications of filters abound in practical and theoretical problems. In a control problem, the objective is to design a controller to ensure the closed-loop system stability and often to satisfy a prescribed level of performance. A main concern in the present study is the implementation of the controller or filter which is often fulfilled by means of a digital device operating in the discrete time domain. Due to the combination of the system continuous-time dynamics and the controller or filter discrete dynamics connected through analog to digital and digital to analog converter devices, the closed-loop system is a hybrid one and is difficult to analyze mathematically. The incorporation of continuous-time and discrete-time signals in a system is often referred to as sampled-data system. A particular difficulty in sampled-data systems is to ensure that the digital controller (filter) meets the design specifications in between the samples. In this dissertation, we develop new methods to take into account this requirement.
Two chapters of this dissertation are devoted to the design of filters for LPV systems. First, we design a continuous-time filter for a continuous-time state-delayed LPV system whose dynamics includes a time varying delay. Next, we address the sampled-data filter design problem for continuous-time LPV systems. In the second part of this dissertation, we investigate the control problem of LPV systems in the framework of sampled-data design. First we present a new approach for the sampled-data control of continuous-time LPV systems. Next, we extend the established results for LPV systems with internal delay.
Advisors/Committee Members: Grigoriadis, Karolos M. (advisor), Franchek, Matthew A. (committee member), Song, Gangbing (committee member), Nikolaou, Michael (committee member), Rao, Jagannatha R. (committee member), Provence, Robert S. (committee member).
Subjects/Keywords: Linear parameter varying (LPV) systems; Sampled-Data Filtering; Sampled-Data Control; Stability Analysis; Time Delay
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APA (6th Edition):
Ramezanifar, A. 1. (2013). Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/1381
Chicago Manual of Style (16th Edition):
Ramezanifar, Amin 1981-. “Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay.” 2013. Doctoral Dissertation, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/1381.
MLA Handbook (7th Edition):
Ramezanifar, Amin 1981-. “Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay.” 2013. Web. 19 Jan 2021.
Vancouver:
Ramezanifar A1. Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay. [Internet] [Doctoral dissertation]. University of Houston; 2013. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/1381.
Council of Science Editors:
Ramezanifar A1. Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay. [Doctoral Dissertation]. University of Houston; 2013. Available from: http://hdl.handle.net/10657/1381
University of Houston
11.
Phadnis, Mandar 1988-.
Feedback Control of CubeSat for Attitude and Trajectory Corrections.
Degree: MSin Electrical Engineering, Electrical Engineering, 2013, University of Houston
URL: http://hdl.handle.net/10657/1553
► In order to analyze the performance of Cube Satellites with regards to orbit maintenance and attitude maneuvers, a three unit (3U) CubeSat with a mass…
(more)
▼ In order to analyze the performance of Cube Satellites with regards to orbit maintenance and attitude maneuvers, a three unit (3U) CubeSat with a mass of four kilograms in six degrees of freedom, is studied and modeled in this research. With a major constraint on their mass and volume, thrusting in small satellites is a limited operational resource. An error in the thrust vector can propagate to a large error in the attitude or trajectory over time. Six degree of freedom rigid body dynamics is implemented using unit quaternion based torque induced roll-pitch-yaw motion. A single thruster is included along the roll axis with a simulated error and the effects due to thrust on the satellites trajectory and attitude are observed over one orbit. Spherical harmonic gravity is implemented to account for the gravitational disturbances in the two body model. Attitude correction is achieved using quaternion feedback control while trajectory corrections are attained using nonlinear state feedback control with backstepping technique. Stability analysis is done using Lyapunovs second method to assure global asymptotic stability. Numerical simulations are conducted to demonstrate attitude and trajectory corrections of the CubeSat using above control strategies.
Advisors/Committee Members: Charlson, Earl J. (advisor), Provence, Robert S. (committee member), Franchek, Matthew A. (committee member).
Subjects/Keywords: CubeSat; Small Satellites; Quaternion; Nonlinear; Spherical harmonics
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APA (6th Edition):
Phadnis, M. 1. (2013). Feedback Control of CubeSat for Attitude and Trajectory Corrections. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/1553
Chicago Manual of Style (16th Edition):
Phadnis, Mandar 1988-. “Feedback Control of CubeSat for Attitude and Trajectory Corrections.” 2013. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/1553.
MLA Handbook (7th Edition):
Phadnis, Mandar 1988-. “Feedback Control of CubeSat for Attitude and Trajectory Corrections.” 2013. Web. 19 Jan 2021.
Vancouver:
Phadnis M1. Feedback Control of CubeSat for Attitude and Trajectory Corrections. [Internet] [Masters thesis]. University of Houston; 2013. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/1553.
Council of Science Editors:
Phadnis M1. Feedback Control of CubeSat for Attitude and Trajectory Corrections. [Masters Thesis]. University of Houston; 2013. Available from: http://hdl.handle.net/10657/1553
12.
Cheng, Wei.
Incremental Conductance Algorithm for Maximum Wind Power Extraction Using Permanent Magnet Synchronous Generator.
Degree: MS, Engineering Technology, 2013, University of Houston
URL: http://hdl.handle.net/10657/417
► Wind energy is by far the fastest growing renewable energy due to its free availability and environmental benefits. Maximum power extraction is a way to…
(more)
▼ Wind energy is by far the fastest growing renewable energy due to its free availability and environmental benefits. Maximum power extraction is a way to realize high power efficiency for Wind Energy Conversion System (WECS). This thesis focuses on studying the feasibility of implementing the Incremental Conductance (INC) method that has been used till now for Maximum Power Point Tracking in photovoltaic (PV) systems. Direct Driven Permanent Magnet Synchronous Generator (PMSG) which has no gearbox is utilized in the proposed system to reduce the cost and increase the reliability of the wind turbine. A certain power conditioning topology which includes an Intermediate Boost Converter (IBC) is employed to facilitate the use of this control method. INC method is compared with the traditional Hill Climbing Search (HCS) method and the advantages of using the INC method in some operation conditions, is validated. A Matlab Simulink model is built to verify this approach.
Advisors/Committee Members: Shireen, Wajiha (advisor), Gurkan, Deniz (committee member), Provence, Robert S. (committee member).
Subjects/Keywords: Maximum Wind Power Extraction; PMSG; Wind Energy Conversion System
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APA (6th Edition):
Cheng, W. (2013). Incremental Conductance Algorithm for Maximum Wind Power Extraction Using Permanent Magnet Synchronous Generator. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/417
Chicago Manual of Style (16th Edition):
Cheng, Wei. “Incremental Conductance Algorithm for Maximum Wind Power Extraction Using Permanent Magnet Synchronous Generator.” 2013. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/417.
MLA Handbook (7th Edition):
Cheng, Wei. “Incremental Conductance Algorithm for Maximum Wind Power Extraction Using Permanent Magnet Synchronous Generator.” 2013. Web. 19 Jan 2021.
Vancouver:
Cheng W. Incremental Conductance Algorithm for Maximum Wind Power Extraction Using Permanent Magnet Synchronous Generator. [Internet] [Masters thesis]. University of Houston; 2013. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/417.
Council of Science Editors:
Cheng W. Incremental Conductance Algorithm for Maximum Wind Power Extraction Using Permanent Magnet Synchronous Generator. [Masters Thesis]. University of Houston; 2013. Available from: http://hdl.handle.net/10657/417
University of Houston
13.
Yarlagadda, Sindhu Krishna 1987-.
A MAXIMUM POWER POINT TRACKING TECHNIQUE FOR SINGLE-PHASE PHOTOVOLTAIC SYSTEMS WITH REDUCED DC-LINK CAPACITOR.
Degree: MSin Electrical Engineering, Electrical Engineering, 2012, University of Houston
URL: http://hdl.handle.net/10657/819
► Electrolytic capacitors used in photovoltaic (PV) power conditioning units (PCU) for power decoupling purposes are less reliable in nature. Film capacitors can be adopted instead…
(more)
▼ Electrolytic capacitors used in photovoltaic (PV) power conditioning units (PCU) for power decoupling purposes are less reliable in nature. Film capacitors can be adopted instead of electrolytic capacitors if the energy storage requirement of the PCU is reduced, since they offer better reliability and have a longer lifetime. The energy storage capacitor size reduction is facilitated by allowing DC-link voltage to have a specified amount of ripple. However, a high DC-link voltage ripple imposes a double-line frequency ripple in the PV panel voltage and current. This leads to oscillations in the extracted panel power and thereby results in power loss. In view of this, this thesis develops a locus line based maximum power point tracking (MPPT) control algorithm to mitigate this power loss. The proposed digital control algorithm was simulated in MATLAB Simulink and implemented in a laboratory prototype using the Digital Signal Processing (DSP)-based microcontroller, TMS320F28035.
Advisors/Committee Members: Shireen, Wajiha (advisor), Chen, Yuhua (committee member), Provence, Robert S. (committee member).
Subjects/Keywords: Maximum power point (MPP) tracking; Photovoltaics; Inverters; DC-link capacitors; Electrical engineering
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APA (6th Edition):
Yarlagadda, S. K. 1. (2012). A MAXIMUM POWER POINT TRACKING TECHNIQUE FOR SINGLE-PHASE PHOTOVOLTAIC SYSTEMS WITH REDUCED DC-LINK CAPACITOR. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/819
Chicago Manual of Style (16th Edition):
Yarlagadda, Sindhu Krishna 1987-. “A MAXIMUM POWER POINT TRACKING TECHNIQUE FOR SINGLE-PHASE PHOTOVOLTAIC SYSTEMS WITH REDUCED DC-LINK CAPACITOR.” 2012. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/819.
MLA Handbook (7th Edition):
Yarlagadda, Sindhu Krishna 1987-. “A MAXIMUM POWER POINT TRACKING TECHNIQUE FOR SINGLE-PHASE PHOTOVOLTAIC SYSTEMS WITH REDUCED DC-LINK CAPACITOR.” 2012. Web. 19 Jan 2021.
Vancouver:
Yarlagadda SK1. A MAXIMUM POWER POINT TRACKING TECHNIQUE FOR SINGLE-PHASE PHOTOVOLTAIC SYSTEMS WITH REDUCED DC-LINK CAPACITOR. [Internet] [Masters thesis]. University of Houston; 2012. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/819.
Council of Science Editors:
Yarlagadda SK1. A MAXIMUM POWER POINT TRACKING TECHNIQUE FOR SINGLE-PHASE PHOTOVOLTAIC SYSTEMS WITH REDUCED DC-LINK CAPACITOR. [Masters Thesis]. University of Houston; 2012. Available from: http://hdl.handle.net/10657/819
University of Houston
14.
Nallapu, Raviteja 1989-.
Orbit Propagation via MRQ Sphere Technique.
Degree: MS, Aerospace Engineering, 2012, University of Houston
URL: http://hdl.handle.net/10657/765
► The Multi-Resolution Quadrature (MRQ) Sphere model, is a newly developed multi- resolution gravity model designed to estimate the gravity fields of arbitrary shaped space bodies,…
(more)
▼ The Multi-Resolution Quadrature (MRQ) Sphere model, is a newly developed multi- resolution gravity model designed to estimate the gravity fields of arbitrary
shaped space bodies, such as asteroids. The MRQ Sphere model uses two recently developed mathematical techniques to approximate the standard spherical harmonics. One of these tools approximates the radial decay terms using the sum of Gaussians,
while the other is used for estimating the angular functions on the nodes of the quadratures of a sphere. In this work, we apply the MRQ sphere technique to the
classic orbit propagation problem and compare the propagated orbit with that generated by the spherical harmonics method. We validate the methods with Earth as the primary body, and propagate the orbit of test cases such as the LAser GEOdynamics Satellite-II (LAGEOS-II) and the GPS BIIA-10 (PRN 32) satellite. We find that the MRQ-Sphere model may be applicable to orbit propagation up
to a user dependent approximation.
Advisors/Committee Members: Grigoriadis, Karolos M. (advisor), Provence, Robert S. (committee member), Rao, Jagannatha R. (committee member).
Subjects/Keywords: Orbit Propagation; Gravity Estimation; MRQ-Sphere; Spherical harmonics; LAGEOS-II; GPS BIIA-10; Cartesian Formulation; Kepplerian elements; Gravity Potential; Orbital Mechanics; Aerospace engineering
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APA (6th Edition):
Nallapu, R. 1. (2012). Orbit Propagation via MRQ Sphere Technique. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/765
Chicago Manual of Style (16th Edition):
Nallapu, Raviteja 1989-. “Orbit Propagation via MRQ Sphere Technique.” 2012. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/765.
MLA Handbook (7th Edition):
Nallapu, Raviteja 1989-. “Orbit Propagation via MRQ Sphere Technique.” 2012. Web. 19 Jan 2021.
Vancouver:
Nallapu R1. Orbit Propagation via MRQ Sphere Technique. [Internet] [Masters thesis]. University of Houston; 2012. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/765.
Council of Science Editors:
Nallapu R1. Orbit Propagation via MRQ Sphere Technique. [Masters Thesis]. University of Houston; 2012. Available from: http://hdl.handle.net/10657/765
University of Houston
15.
Zamanian, Fatemeh.
Nonlinear Controller Design for Regulating Systems.
Degree: PhD, Mechanical Engineering, University of Houston
URL: http://hdl.handle.net/10657/2830
► Presented in this dissertation is a nonlinear controller synthesis methodology based on the inverse Sinusoidal Input Describing Function (SIDF) for a class of regulating systems.…
(more)
▼ Presented in this dissertation is a nonlinear controller synthesis methodology based on the inverse Sinusoidal Input Describing Function (SIDF) for a class of regulating systems. The design goal is to improve regulating performance beyond what is achievable by a linear control for a predicted level of disturbance step size. The controller design is executed using open loop frequency domain information and is applicable when the frequency response of a linear design cannot satisfy the designed open loop gain and phase characteristics. The gain and phase differences between the designed open loop frequency response and that of a linear design is treated as SIDF distortions. The inverse describing function approach is employed to identify an isolated explicit nonlinearity that is associated with obtained gain and phase distortions.
For this, a computational solution to the inverse SIDF for a broad class of hysteresis or memoryless explicit nonlinearities is developed. The proposed numerical solution uses gain and phase distortions as a function of input amplitude size to identify the nonlinearity, and does not require a priori knowledge of the nonlinearity in the estimation process. The output from the algorithm is a non-parametric model of the nonlinearity from which a parametric model can be recovered.
To illustrate the proposed nonlinear controller design technique, the idle speed control of a V-6 fuel injected engine model subject to an external torque load disturbance is considered. The closed loop performance is validated through simulation and the closed loop stability in the sense of the bounded-input-bounded-output (BIBO) is assessed using Circle Theorem.
Advisors/Committee Members: Franchek, Matthew A. (advisor), Grigoriadis, Karolos M. (committee member), Rao, Jagannatha R. (committee member), Song, Gangbing (committee member), Provence, Robert S. (committee member).
Subjects/Keywords: Nonlinear Control; Frequency Domain; Inverse Sinusoidal Input Describing Function; H_∞ Linear Control Synthesis; BIBO Stability; Inverse Sinusoidal Input Describing Function; Gain distortions; Phase distortions; Memoryless Nonlinearities
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APA ·
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APA (6th Edition):
Zamanian, F. (n.d.). Nonlinear Controller Design for Regulating Systems. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/2830
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Chicago Manual of Style (16th Edition):
Zamanian, Fatemeh. “Nonlinear Controller Design for Regulating Systems.” Doctoral Dissertation, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/2830.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
MLA Handbook (7th Edition):
Zamanian, Fatemeh. “Nonlinear Controller Design for Regulating Systems.” Web. 19 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Vancouver:
Zamanian F. Nonlinear Controller Design for Regulating Systems. [Internet] [Doctoral dissertation]. University of Houston; [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/2830.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Council of Science Editors:
Zamanian F. Nonlinear Controller Design for Regulating Systems. [Doctoral Dissertation]. University of Houston; Available from: http://hdl.handle.net/10657/2830
Note: this citation may be lacking information needed for this citation format:
No year of publication.
. 
Open Access Theses and Dissertations
