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Mechanical Engineering Technology

Central Washington University

Class of 2016

Ellensburg, Washington, United States


The purpose of this project was to develop a rear suspension system to support the frame of an Electrathon Vehicle. The vehicle is designed to compete in the Electrathon America competition on behalf of the Central Washington University Electric Vehicle Club. The system was designed to use readily available parts sourced from manufacturers so as to keep the components serviceable. Using dynamic and static engineering analysis, the necessary custom components were designed. Once the parts were sourced and assembled to the existing vehicle frame, minor modifications were made to better accommodate use of the automotive coil-over spring and shock absorber assembly. The project articulates and dampens as designed, although the system is over-sprung for taking advantage of future weight changes to the currently-incomplete vehicle. However, by anticipating weight additions and designing the assembly with a factor of safety, the suspension system will remain intact and safe for future students that have the opportunity to work on the vehicle. Overall, the project was a success in that the system is easily serviceable, reliable, safe, and functions as designed.

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