Research on Damping Characteristics of Shock Absorber for Heavy Vehicle

The damping characteristic of shock absorber has an important influence on its design and overall performance of vehicle system. Firstly, the structural features and working principle of hydraulic shock absorber are introduced. Then the detail testing scheme of the shock absorber is proposed and the damping characteristics are tested under both sinusoidal and random displacement excitation (HT-911 dynamic material test platform). The testing data under different excitation frequency and amplitude are analyzed, respectively. The tested results show that the shock absorber has the typical features of non-linearity, non-symmetry and hysteresis. In order to satisfy the vehicle dynamics simulation, the Besinger model is chosen to describe shock absorb nonlinear characteristics. The LSM (Least Squares Method) is utilized to identify seven parameters of Besinger model based on experiment results. Finally, a nonlinear virtual prototype model of heavy duty vehicle is built to prove the fitted shock absorber model effectively.