Abstract
Suspension systems are one important part of automotive chassis that impact the level of passenger comfort and vehicle aerodynamics is clearly. So, a good suspension design is considered all vehicle designers in automotive industry. Suspension systems are composed 4 main components such as springs, shock absorbers, suspension mechanism and its interface of connections that its mainly tasks are isolation of a car body from road roughness to comfort passenger travel and establish a permanent contact between tire and road conditions to the proper performance tire is in motion. Therefore, suspension testing that has a direct impact on passenger safety and comfort is essential and important. Given the high cost and time of testing should be used different ways to study it.This paper presents used a quarter car model in according road classification ISO 2631-1 is achieved road roughness as PSD function in a constant speed of car by using Matlab Code. in continually, study effect of random vibration and variable amplitude loading (VAL) on the suspension system performance. Finally, has been studied tire adhesion to the ground.
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