ANALYSIS AND OPTIMIZATION OF BEAM OPENING ANGLE OF TORSION BEAM SUSPENSION TO IMPROVE FREQUENCY RESPONSE CHARACTERISTICS OF WHOLE VEHICLE

다국어 초록 (Multilingual Abstract)

Taking torsion beam suspension as the research object, the kinematics characteristics of the suspension are analyzed, and the expressions of the wheel alignment parameters are established. It also explains why the changes in the suspension’s roll stiffness and the load transfer between the left and right wheels affect the handling stability. According to the established 3-DOF vehicle dynamic model, the transfer functions of the vehicle response index relative to the steering wheel angle are deduced. The rigid-flexible coupling model of torsion beam suspension and the multi-body dynamics model of the vehicle are established. The influence of the opening angle on the suspension performance and the mechanism are analyzed through simulation. Based on swept-sine input simulation, the change law of the transient response index in low and high frequency, and the relationship between the opening angle and the transient stability index are obtained. Finally, the opening angle is taken as the optimization variable, and the transient response index of the vehicle at 0.5 Hz under swept-sine input simulation is taken as the optimization objective through NSGA-II algorithm. When the opening angle is about 85°, the vehicle’s transient response index reaches the optimal, which is the optimal opening angle.