INVESTIGATE VEHICLE DESIGN PARAMETERS EFFECT ON DYNAMIC VEHICLE STABILITY

Abstract

In this paper, a two degree of freedom linear vehicle model is proposed to investigate dynamic vehicle stability under varies vehicle maneuvers. The simulation is developed using MATLAB/Simulink application program to predict the vehicle dynamic stability under different maneuvers. To investigate vehicle stability, the Steering wheel angle is chosen to be the primary model input for the analysis procedures. The developed model is validated via Step steer input. Moreover, a new typical steer wheel angle is developed to examine highway predicted vehicle output within its maneuver. The vehicle dynamic outputs, namely, yaw rate and lateral acceleration are adopted for all the investigated maneuvers. It is found that the vehicle design parameters such as changing the vehicle center of gravity (CG) position, vehicle mass, tire cornering stiffness and vehicle speed have a significant influence on the vehicle dynamic stability. Change in vehicle center of gravity position is the most parameter has an influence in vehicle stability dynamics. 10% forward and reward in the C.G position change in under steering gradient, it changes steering in vehicle model from under steering type to over steering type, on the other hand, vehicle mass change ±10% change in vehicle mass has the latest influence in vehicle stability dynamic. Others have a different rate effect on vehicle dynamic stability.