Engineering Commons^™

Low Bandwidth Communication For Networked Power Hardware-In-The-Loop Simulation, Sean Borgsteede

Theses and Dissertations

Power-Hardware-In-the-Loop (PHIL) simulations allow the design and validation of power hardware components in virtual power system schemas with near real-time operation. This technique is increasingly used in the development cycle of many products to reduce design costs and increase design fidelity. The Hardware under Test (HuT) interfaces with a simulation of the user’s choosing through a hardware interface (HI). The digitally simulated system (DSS) runs on the real-time simulator before sending a reference value to the hardware interface to enforce. In this virtual to real interface, closed-loop stability and the simulation accuracy are the two paramount criteria in regards to …

Dynamic Model And Control Of Quadrotor In The Presence Of Uncertainties, Courage Agho

Theses and Dissertations

This thesis considers the control of quadrotor using a linear PID control and ℒ1 adaptive control. In a justifiable concept, PID controller can be used to control a quadrotor, but in the presence of uncertainties or disturbance, the quadrotor can’t be automatically adjusted to control the changing dynamics of the quadrotor. To solve the problem associated with uncertainties, various control methodology can be used for controlling the changing dynamic of quadrotor, but in this thesis, ℒ1 adaptive control is used because it allows for fast and robust adaptation for desired transient performance in the presence of matched and unmatched uncertainties. …

Physical Characterization Of Electrodeposited Pcb Copper Foil Surfaces, Blessing Kolawole Ojo

Theses and Dissertations

Given that data rates of computers is on the rise and optimization of bus speeds continue to be of importance in improving the system performance, different models for a prediction of the impact of the surface roughness of copper foil have been developed and incorporated into different software’s and applications used by design engineers.

With different models known to have been created for characterization of electrodeposited copper, they have been mostly affected by the need for higher frequencies as they are mostly useful for prediction at frequency of a few GHz. With the introduction of a new model (known as …

A Lebesgue Sampling Based Diagnosis And Prognosis Methodology With Application To Lithium-Ion Batteries, Wuzhao Yan

Theses and Dissertations

Fault diagnosis and prognosis (FDP) plays an important role in the modern complex industrial systems to maintain their reliability, safety, and availability. Diagnosis aims to monitor the fault state of the component or the system in real-time. Prognosis refers to the generation of long-term predictions that describe the evolution of a fault and the estimation of the remaining useful life (RUL) of a failing component or subsystem.

Traditional Riemann sampling-based FDP (RS-FDP) takes samples and executes algorithms in periodic time intervals and, in most cases, requires significant computational resources. This makes it difficult or even impossible to implement RS-FDP algorithms …

Three Segment Adaptive Power Electronic Compensator For Non-Periodic Currents, Amin Ghaderi

Theses and Dissertations

In this dissertation, a new technique is proposed for the compensation of nonperiodic load current. The method provides control references for three co-located devices, each corresponding to one moving calculation window and one decomposed part of the compensated current. They are slow compensator with high power rating, large calculation window, and low switching frequency; fast compensator with lower power rating, shorter calculation window, and higher switching frequency; and the reactive compensator which is an ordinary static VAR compensator (SVC). To improve the flexibility of the technique, a fuzzy based adaptive window is proposed for the slow compensator to find the …

Wideband Low Side Lobe Aperture Coupled Patch Phased Array Antennas, Dhruva Poduval

Theses and Dissertations

Low profile printed antenna arrays with wide bandwidth, high gain, and low Side Lobe Level (SLL) are in great demand for current and future commercial and military communication systems and radar. Aperture coupled patch antennas have been proposed to obtain wide impedance bandwidths in the past. Aperture coupling is preferred particularly for phased arrays because of their advantage of integration to other active devices and circuits, e.g. phase shifters, power amplifiers, low noise amplifiers, mixers etc. However, when designing such arrays, the interplay between array performance characteristics, such as gain, side lobe level, back lobe level, mutual coupling etc. must …

Distributed Optimization Method For Intelligent Control Of Dc Microgrids, Yuanyuan Fan

Theses and Dissertations

Most of the distributed energy resources, loads and energy storage systems in a DC microgrid are equipped with power electronic converters. With the integration of advanced power electronics devices, a microgrid is able to utilize a broader range of technologies in its design and operation. A key feature of power electronic converter based systems is the ability to direct energy flow within a system with their coordinated operation. A system level control is needed for coordination where converters execute reference points dictated by a system-level control in order to achieve system level goals. System goals can be expressed as a …

High Quality Low Offcut 4h-Sic Epitaxy And Integrated Growth Of Epitaxial Graphene For Hybrid Graphene/Sic Devices, Anusha Balachandran

Theses and Dissertations

Power electronic semiconductor devices are critical components in next-generation power systems such as hybrid electric vehicles and smart grid power controls enabling reduction in system size, weight, and cost. Wide bandgap materials such as SiC, GaN, and diamond have been investigated to replace silicon, due to their superior material properties. Of these, 4H-SiC is considered the most viable candidate beyond 3kV due to its technological maturity, its wide band gap (3.23 eV), high breakdown field (4×106 V/cm), high thermal conductivity (5 W/cm/K) and, more importantly, its indirect bandgap.

The main contribution of my research relates to the development and investigating …

Analysis And Design Of A Highly Compact Ellipse-Shaped Ultra-Wideband Bandpass Filter (Uwb-Bpf) With A Notched Band, Xuetan Liu

Theses and Dissertations

Since the Federal Communications Commission’s endorsement of the frequency band of 3.1 – 10.6 GHz in 2002 to be unlicensed for wireless communication applications, various ultra-wideband bandpass filters (UWB-BPFs) have been proposed and designed. Different UWB-BPF configurations were presented in the past years to meet the very strict UWB-BPF specifications in terms of ultra-band requirement, low return loss, high rejection in notched bands. However, most of the previous works are limited by large dimension size, complex geometry, and high production cost.

The major objective of this work is to design a highly compact, simple geometry, and low-cost UWB-BPF, which passes …

An Application Of Dempster-Shafer Fusion Theory To Lithium-Ion Battery Prognostics And Health Management, John Weddington

Theses and Dissertations

Prognostics and Health Management (PHM) is the discipline involving diagnostics and prognostics of components or systems, with the primary objective of increasing the overall reliability and safety of these components or systems. PHM systems convert raw sensor data into features, and utilize state observers to estimate the current damage state online. Popular state observers are the traditional Kalman filter, along with its non-linear extensions, and the particle filter. Each technique has differing advantages. This thesis investigates the fusion of results from different techniques in order to achieve a more trustworthy probability of detection (PoD) during diagnosis and a more reliable …

Study Of Mos2 And Graphene-Based Heterojunctions For Electronic And Sensing Applications, Ifat Jahangir

Theses and Dissertations

Since the discovery of graphene, there has been an increase in two-dimensional (2D) materials research for their scalability down to atomic dimensions. Among the analogs of graphene, transition metal dichalcogenides (TMDs) are attractive due to their exceptional electronic and optoelectronic properties. MoS2, a TMD, has several advantages over graphene and the industry workhorse Si, and has been reported to demonstrate excellent transistor performances. The key obstacle in the commercialization of MoS2 technology is low carrier mobility over large areas for top-down devices. Although there were several early reports on synthesis of atomically thin MoS2 with moderate mobility, transferring large area …

Ultra High-Speed Signaling And Return On Technology Investment (Roti) For The Electrical Interconnects Sector, Azniza Abd Aziz

Theses and Dissertations

Demand for smaller platform sizes with increasing bandwidth has driven crosstalk problems that prevent bus performance to scale with Moore’s Law. Several approaches to reduce crosstalk such as the use of shields, differential links, and equalizers have been rejected due to higher cost and power required to overcome the signal integrity impediments at Gigahertz data rates. Eigen-mode signaling based on modal decomposition techniques is the most recent method to mitigate crosstalk that can potentially satisfy the demand for higher data rates from modern technology industry.

The goal of this research is to allow maximum dense routing between packages on PCBs …