Author : Kareem Hassan and Asaad Ali Dammed

This paper aims at finding differences by investigating the results of the semi-active suspension of a quarter of a car and comparing its results with negative feedback performance results by using the LabVIEW simulation system. We will compare the practical and theoretical results of each system (passive suspension system and Semi-active suspension system). For the dynamic system used is a linear system which features the basic performance of the suspension system such as acceleration of the body, displacement of wheels, suspension flights, displacement of wheels. The main task of the suspension design is to provide the comfort of the ride and provide the long life of the vehicle and others. These factors can be measured by the performance of wheel deflection and body displacement. The inputs used are two types of road features. After conducting tests and practical and theoretical tests, the suggested semi-active suspension is better than passive suspension through the performance of body displacement and the displacement wheel.

Keywords: passive suspension Semi-Active suspension, Quarter car Model, LabVIEW Simulink, step and random road disturbance