Browsing by Author "Choe, Song-Yul"

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Charging strategy considering subzero temperature based on electrochemical-thermal life model for lithium-ion batteries

Song, Minseok (2021-12-05) ETD File Embargoed

In order to overcome range anxiety of electric vehicles (EVs) powered by lithium-ion batteries, more batteries are installed to increase battery capacity, which results in a long charging time that is one of the most ...

Construction of a Diesel Engine Test Stand and a Crank Angle Based Heat Release Model

Wingo, Taylor (2011-11-15)

A test stand for a light duty diesel engine was constructed and used to measure both mean and crank angle based engine operating parameters. The test stand features a 1.1L Hyundai CRDi turbo-diesel engine, a Land and Sea ...

Control and Analysis of Air, Water, and Thermal Systems for a Polymer Electrolyte Membrane Fuel Cell

Ahn, Jongwoo (2011-07-27)

The polymer electrolyte membrane (PEM) fuel cell is a power source that can potentially replace the internal combustion engine in vehicles of the future. When hydrogen stored in a tank and oxygen from the air chemically ...

Control of a Fuel Delivery System for Polymer Electrolyte Membrane Fuel Cells based on a Two-Phase Transient Model

He, Jinglin (2011-07-27)

Polymer electrolyte membrane fuel cells (PEMFCs) are a type of fuel cell that converts the chemical energy released by the reaction of hydrogen (fuel) and oxygen into electrical energy and generates water and heat. The ...

Controlling the Speed of a Magnetically-Suspended Rotor with Compressed Air

Jantz, Robert (2011-04-08)

Magnetic bearing research is generally concerned with the development of the automatic control systems required to levitate a rotor, driven by either an electric motor or air turbine. The regulation of rotor speed in ...

Design and Analysis of Air and Coolant Control for a Polymer Electrolyte Membrane Fuel Cell

Ahn, Jongwoo (2007-08-15)

The polymer electrolyte membrane (PEM) fuel cell is an alternative engine that can potentially replace the internal combustion engine in the vehicles of the future. When hydrogen, stored in a tank, and oxygen, from the ...

Design and Evaluation of a 3D Road Geometry Based Heavy Truck Fuel Optimization System

Huang, Wei (2010-07-28)

This dissertation develops a 3D road geometry based optimal powertrain control system in reducing the fuel consumption of heavy trucks. The real-time optimal control (OC) system, solving a constrained nonlinear programming ...

Design of Calorimeter and Heat Measurement of Lithium-ion Battery

Zheng, Zhong (2017-04-20)

Since the temperature of the lithium-ion battery has a great impact on its performance and life, heat generation measurement of the lithium-ion battery becomes one of the most important parts of designing lithium-ion battery ...

Dynamic Modeling of Polymer Electrolyte Membrane Fuel Cell Stack with 1D and 2D CFD Techniques

Shan, Yuyao (2006-08-15)

The PEM fuel cell is a potential candidate for use as an alternative power source in future vehicle and power conditioning applications. The electric power, as a load, continuously varies as a function of time in the ...

Dynamic Modeling of Two-Phase Heat and Vapor Transfer Characteristics in a Gas-to-Gas Membrane Humidifier for Use in Automotive PEM Fuel Cells

Alan, Dunlavy (2009-11-19)

Due to the recent negative outlook on the availability of cheap, long term energy supplies from non-renewable resources, several technologies have been proposed and revisited as possible solutions to the current energy ...

Electrochemical modeling of degradation effects at a wide range of temperatures for lithium ion polymer batteries

Zhao, Xinchen (2018-11-30)

The durability of lithium-ion batteries (LiBs) drops gradually undergoing both storage and prolonged cycling conditions, which is greatly affected by the operating conditions, particularly temperatures. At high temperatures, ...

Energy Cost Reduction for Medical Facilities

O'Mary, Gregory (2012-11-07)

An intensive energy audit was performed on Russell Medical Center located in Alexander City, AL. It began in 2009 and was completed in 2012. The purpose of this audit is to find effective strategies to reduce energy costs ...

Estimation of State of Charge (SOC) and Water Loss for Absorbed Glass Mat Lead Acid Battery

Cao, Nan (2015-07-29)

Accurate and fast estimation of state of charge (SOC) and water loss during battery operations plays an important role in the prevention of over-charge and over-discharge and optimal control strategy of charging, which ...

Experimental and Theoretical Analysis of High Power Connectors for Hybrid Vehicles

Fu, Rujian (2011-04-26)

Hybrid electric vehicles (HEV) are the next evolutionary step of the automobile which substantially increases fuel economy and reduces emissions. They are comprised of many new technologies so there is limited information ...

Experimental and theoretical characterization of thermal behavior of large format pouch type lithium-ion battery

Hu, Yang (2021-04-20)

Fundamental understanding of the heat generation process of lithium-ion batteries during operations is crucial for securing lifespan and safety by the cost-effective and efficient design of thermal management systems. Heat ...

Experimental Characterization of Battery Performance under Non-Uniform Temperature Gradient

Choi, Chihwan (2023-07-27) ETD File Embargoed

In order to ensure optimal performance of the batteries, a thermal management system (TMS) is suited in electric vehicles for the temperature control. However, due to the non-uniform heat generation of the large format ...

An Experimental Investigation and a Multiscale Electro-thermo-mechanical Model of a Flat Pin High Power Electrical Connector

Angadi, Santosh (2011-11-03)

Hybrid and electrical vehicles (HEV) are the next evolutionary step in automobile technology. However, the electrical systems which propel HEVs are fundamentally different from conventional technologies. Therefore, a few ...