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Full-Text Articles in Engineering
Techniques To Overcome Energy Storage Limitations In Electric Vehicles, Matthew J. Hansen
Techniques To Overcome Energy Storage Limitations In Electric Vehicles, Matthew J. Hansen
All Graduate Theses and Dissertations, Fall 2023 to Present
Electric vehicles are becoming increasingly popular, battery limitations (cost, size, and weight) complicate electric vehicle adoption. While important research on battery development is ongoing, this dissertation discusses two main approaches to overcome those limitations within the existing battery technology paradigm. Those thrusts are: improving battery health through an optimal charging strategy and minimizing necessary battery size through dynamic wireless power transfer. In this dissertation, relevant literature is discussed, with opportunities for further development considered. Within the two thrusts, three objectives sharpen the focus of the research presented here. First, a planning tool is defined for a battery electric bus fleet. …
Cost Minimizing Energy Management Control Scheme For Microgrids Considering Dynamic Electricity Prices, Levi T. Miller
Cost Minimizing Energy Management Control Scheme For Microgrids Considering Dynamic Electricity Prices, Levi T. Miller
All Graduate Theses and Dissertations, Fall 2023 to Present
As countries develop and technology improves, the world is using more energy than ever before. This fact along with several other political, social, and economic factors has resulted in simultaneous energy and climate crises. A partial solution to both problems is bringing clean energy sources of electricity closer to the customers who use that energy. A microgrid is a smaller version of the national electric grid where smaller electricity generators are networked with local consumers and controlled independently of the main grid. Because control of electricity sources and loads are transferred to local controllers, the flexibility with which they can …
Maximum Likelihood Temperature/Emissivity Separation Of Hyperspectral Images With Gaussian Distributed Downwelling Radiance, David A. Neal
Maximum Likelihood Temperature/Emissivity Separation Of Hyperspectral Images With Gaussian Distributed Downwelling Radiance, David A. Neal
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Hyperspectral images are made up of energy measurements at different wavelengths of light. The case is considered where these measurements are dependent on temperature, the self-emitted energy (emissivity), and reflected energy (downwelling radiance) from the surroundings. The process where the downwelling radiance is fixed and the temperature and emissivity are estimated is referred to as temperature/emissivity separation.
Due to the way these terms mix, for a given set of measurements, there exist many pairs of temperatures and emissivities that satisfy the model. This creates ambiguity in the solution that must be resolved for the result to have any significance.
A …
Optimization And Control Of Lumped Transmitting Coil-Based In-Motion Wireless Power Transfer Systems, Nazmul Hasan
Optimization And Control Of Lumped Transmitting Coil-Based In-Motion Wireless Power Transfer Systems, Nazmul Hasan
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This thesis explores optimization and control aspects of in-motion electric vehicle charging. The vision is of an electrified roadway, where the vehicles can move and charge at the same time. The present systems have long tracks embedded in the roadway which transfer energy. This thesis explores smaller coils in the road, which has the promise of higher efficiency and lower volt ampere ratings. The promise can only be realized through optimized design and synchronized control of charging with respect to vehicle position. The existing design procedures lack comprehensiveness, require designer experience and use computationally costly 3D FEM algorithms. The proposed …
Multi-Functional Reconfigurable Antenna Development By Multi-Objective Optimization, Xiaoyan Yuan
Multi-Functional Reconfigurable Antenna Development By Multi-Objective Optimization, Xiaoyan Yuan
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Antennas are the most essential and significant elements of any wireless communication system. The most common antennas used in wireless communication systems include dipoles/monopoles, horn antennas, loop antennas, and micro-strip antennas. Each type possesses inherent advantages and disadvantages that make them satisfactory for particular applications. The properties of these antennas, however, are fixed by the initial design and cannot be changed. These fixed properties impose restrictions on the overall system performance as the antenna cannot adapt its characteristics in response to the changing propagation parameters of the wireless medium. A reconfigurable antenna, on the other hand, can dynamically change its …
Decentralized Coordination Of Multiple Autonomous Vehicles, Yongcan Cao
Decentralized Coordination Of Multiple Autonomous Vehicles, Yongcan Cao
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This dissertation focuses on the study of decentralized coordination algorithms of multiple autonomous vehicles. Here, the term decentralized coordination is used to refer to the behavior that a group of vehicles reaches the desired group behavior via local interaction. Research is conducted towards designing and analyzing distributed coordination algorithms to achieve desired group behavior in the presence of none, one, and multiple group reference states.
Decentralized coordination in the absence of any group reference state is a very active research topic in the systems and controls society. We first focus on studying decentralized coordination problems for both single-integrator kinematics and …
Meshed Patch Antennas Integrated On Solar Cell - A Feasibility Study And Optimization, Timothy W. Turpin
Meshed Patch Antennas Integrated On Solar Cell - A Feasibility Study And Optimization, Timothy W. Turpin
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This thesis work presents the feasibility of integrating meshed patch antennas directly onto the solar cell assembly to save valuable surface real estate of a small satellite. The solar cell cover glass is used as the substrate for the patch antenna. The antenna topology is chosen to be a meshed patch so that it is transparent to light to ensure the proper operation of solar cells. We found that although there is a compromise between the antenna efficiency and see-through percentage, one is able to optimize the antenna by carefully designing the mesh. To verify the design and integration, a …