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Full-Text Articles in Engineering

Development Of A Fuel Cell Plug-In Hybrid Electric Vehicle And Vehicle Simulator For Energy Management Assessment, Andrew Meintz Jan 2011

Development Of A Fuel Cell Plug-In Hybrid Electric Vehicle And Vehicle Simulator For Energy Management Assessment, Andrew Meintz

Doctoral Dissertations

"This dissertation offers a description of the development of a fuel cell plug-in hybrid electric vehicle focusing on the propulsion architecture selection, propulsion system control, and high-level energy management. Two energy management techniques have been developed and implemented for real-time control of the vehicle. The first method is a heuristic method that relies on a short-term moving average of the vehicle power requirements. The second method utilizes an affine function of the short-term and long-term moving average vehicle power requirements. The development process of these methods has required the creation of a vehicle simulator capable of estimating the effect of …


Modeling Of Novel Coaxial Cable Bragg Grating Sensor By Coupled Mode Theory, Songping Wu Jan 2011

Modeling Of Novel Coaxial Cable Bragg Grating Sensor By Coupled Mode Theory, Songping Wu

Doctoral Dissertations

"A new sensor based on the novel concept of coaxial cable Bragg grating (CCBG) has been developed for the integrity of civil infrastructure monitoring. In this dissertation work, fundamental research is conducted in sensor modeling and applications, which correspond to the first four papers of the dissertation. A coupled mode theory (CMT) is first applied to establish a physics-based model for CCBG. A numerical solution of the coupled wave equations for CCBG has been derived and validated. As an indicator of sensor sensitivity, the quality factor (Q-factor) of CCBG as a function of sensor structural/material parameters was analytically investigated by …


Hardware Emulation Of Wireless Communication Fading Channels, Fei Ren Jan 2011

Hardware Emulation Of Wireless Communication Fading Channels, Fei Ren

Doctoral Dissertations

"This dissertation investigates several main challenges to implementing hardware-based wireless fading channel emulators with emphasis on incorporating accurate correlation properties. Multiple-input multiple-output (MIMO) fading channels are usually triply-selective with three types of correlation: temporal correlation, inter-tap correlation, and spatial correlation. The proposed emulators implement the triply-selective fading Channel Impulse Response (CIR) by incorporating the three types of correlation into multiple uncorrelated frequency-flat Rayleigh fading waveforms while meeting real-time requirements for high data-rate, large-sized MIMO, and/or long CIR channels. Specifically, mixed parallel-serial computational structures are implemented for Kronecker products of the correlation matrices, which makes the best tradeoff between computational speed …


Impact Of Stochastic Loads And Generations On Power System Transient Stability, Theresa Odun-Ayo Jan 2011

Impact Of Stochastic Loads And Generations On Power System Transient Stability, Theresa Odun-Ayo

Doctoral Dissertations

"Randomness in physical systems is usually ultimately attributed to external noise. Dynamic systems are driven not only by our own control inputs, but also disturbances which cannot be modeled deterministically. A linear system model is justifiable for a number of reasons, often such a model is adequate for the purpose at hand, and when non-linearities do exist, the typical engineering approach is to linearize about some nominal point or trajectory to achieve a perturbation or error model. However, in order for the resulting model to fit data generated by the real world, these disturbances need to be modeled stochastically. The …


Robust Adaptive Filtering Algorithms For System Identification And Array Signal Processing In Non-Gaussian Environment, Tiange Shao Jan 2011

Robust Adaptive Filtering Algorithms For System Identification And Array Signal Processing In Non-Gaussian Environment, Tiange Shao

Doctoral Dissertations

"This dissertation proposes four new algorithms based on fractionally lower order statistics for adaptive filtering in a non-Gaussian interference environment. One is the affine projection sign algorithm (APSA) based on L₁ norm minimization, which combines the ability of decorrelating colored input and suppressing divergence when an outlier occurs. The second one is the variable-step-size normalized sign algorithm (VSS-NSA), which adjusts its step size automatically by matching the L₁ norm of the a posteriori error to that of noise. The third one adopts the same variable-step-size scheme but extends L₁ minimization to Lp minimization and the variable step-size normalized fractionally lower-order …