Analysis of Suspension Spring Rate on Body Roll of Sports Car Using Multi-Body Dynamics Method

The suspension system was created to reduce the shock received from the contours of the road surface and absorb the forces due to vehicle dynamics including when it is cornered. When the vehicle corners, there is a load transfer that causes the vehicle to lean towards the outside of the corner or commonly called body roll. The body roll that occurs affects the ride and performance of the vehicle. In this study, an analysis of the effect of the spring rate of suspension spring on sports car body roll will be carried out using the Multi-Body Dynamics (MBD) method to produce output in the form of roll angle, roll rate, and roll center. The types of MBD analysis used are Static Roll Analysis and Step Steer Analysis in Altair MotionView software. The reference vehicle used is a Toyota 86 sports car with variations in the spring rate of suspension springs of 59, 70, and 78 N/mm. From the tests carried out, the results were obtained that the greater the spring rate value of a suspension spring, the less body roll behavior will occur so that the vehicle is more stable when cornering.