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Browsing by Author "Choe, Song-Yul"
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Modeling and Analysis of a PEM Fuel Cell System for a Quadruped Robot
Lee, Heon Joong (2009-07-15)
The polymer electrolyte membrane fuel cell is a prospective alternative energy conversion device that has environment-friendly characteristics. It has not only electrochemical reaction but also coupled thermal fluid ...
Modeling and Analysis of PZT Micropower Generator
Ajitsaria, Jyoti (2008-12-15)
The goal of this research is to theoretically and experimentally investigate behaviors of a power harvesting system that was constructed with a bimorph cantilever made of Lead Zirconate Titanate (Pb[ZrxTi1-x]O3) and a ...
Modeling, Validation and Analysis of Degradation Processes of Lithium Ion Polymer Batteries
Fu, Rujian (2014-07-29)
The lithium ion polymer battery (LiPB) has become one of the most widely used energy storage devices because of its high energy and power densities. However, its performance and life span are limited by the degradation ...
A Multi-Physics Finite Element Analysis of Round Pin, High Power Connectors
Polchow, John (2010-04-15)
In the past decade, the general public’s means of transportation has begun to undergo a radical transformation, moving away from only using gasoline and moving toward using a combination of gasoline and electricity. This ...
A Non-contact Method for Sensing Tire Contact Patch Deformation Using a Monocular Vision System and Speckled Image Tracking
Green, Russell (2011-05-16)
A full-field, non-contact deformation sensing system was developed with an application for tires. Using an image tracking algorithm, in-plane displacements and their gradients were calculated. Furthermore, the effects of ...
Online Monitoring of State of Health for AGM Lead Acid Batteries
Gao, Yumeng (2015-07-29)
Prediction of degradation states like power and capacity fade is the most challenging issue for rechargeable batteries, which is called State of Health (SOH). Power and capacity fade is evaluated by predicting Available ...
Piezoelectric Energy Harvesting Devices for Low Frequency Vibration Applications
Shen, Dongna (2009-05-15)
Energy harvesting, a process of capturing ambient waste energy and converting it into usable electricity, has been attracting more and more researchers’ interest because of the limitations of traditional power sources, the ...
Quasi 3D electrochemical and thermal modeling of lithium ion polymer battery in time and frequency domain and its validation
Xiao, Meng (2013-07-19)
A dynamic model for a pouch type Li-polymer battery based on electrochemical, thermal, and double layer principles is developed to analyze static and dynamic performances of a single cell. The model is built in three steps: ...
Simultaneous Estimation of State of Charge and State of Health of a Large Format Li-ion Cell based on an Equivalent Circuit Model
Gairola, Saurabh (2019-07-29)
Accurate estimations of the state of charge (SOC), capacity fade (SOHQ) and power fade (SOHP) are critical for ensuring safe and reliable operations of Lithium-ion batteries. Traditional estimation methods using complex ...
State of Charge Estimation for Advanced Batteries: Reduced Order Electrochemical Modeling with Error Compensation
Malinowski, Kyle (2011-11-17)
Advanced battery management systems are essential for efficient electrification of vehicles. Correct state of charge (SOC) estimates will maintain a battery within its charge limits and extend its usable life. Existing SOC ...
A Study of the Effect of Various Material Combinations on the Bolted Contacts of Busbars
Gatherer, James (2013-07-11)
The reliability of bolted joints is a concern for high-powered devices as the generated heat and thermal expansion could loosen the connections over many actuation cycles. There currently appears to be relatively little ...
Theoretical and Experimental Analysis of Strain in a Tire Under Static Loading and Steady-State Free-Rolling Conditions
Krithivasan, Vijaykumar (2011-04-11)
This main objective of this work is to predict
the operating conditions or the state of a tire based on a
wireless sensor suit. First a three dimensional finite element
model of a standard reference test tire (SRTT) was ...
Thermal Electrochemical Dynamic Modeling of Sealed Lead Acid Batteries
Siniard, Kevin (2009-08-06)
Limitations to battery technology ranks second as the most vital problem facing the electronic and mechanical engineering industry in the future. The life span and performance of batteries specifically SLI (Starting – ...
Tire Force Estimation in Off-Road Vehicles Using Suspension Strain and Deflection Measurements
Hill, Ryan (2012-01-24)
This thesis develops and analyzes the improvement of tire force estimation and analysis using strain gauge sensors and displacement sensors mounted on the suspension of an all-terrain vehicle. Vehicle dynamic models are ...
Ultra-wideband Radio Aided Carrier Phase Ambiguity Resolution in Real-Time Kinematic GPS Relative Positioning
Broshears, Eric (2013-07-10)
In this thesis, ultra-wideband radios (UWBs) are integrated into the real-time kinematic (RTK) algorithm using differential GPS techniques to achieve a highly precise relative positioning vector between GPS antennas. This ...