Effect of powertrain mounting system on dynamics performances of vehicle

Powertrain mounting system (PMS) is added on a 1/4 vehicle model to form a vertical vibration model for vehicle front axle, based on which the effects of different designs of PMS on the natural properties of system and the driving dynamic performance of vehicle are analyzed. Meanwhile, a 2 DOF linear vehicle model is combined with PMS to build a 3 DOF vehicle lateral dynamic model, with which the vehicle responses to both the step and pulse input of steering angle are calculated to analyze the effects of different designs of PMS on both the steady state and transient steering characteristics of vehicle. The results indicate that PMS has significant effects on vehicle body acceleration, but only has a trivial effect on the dynamic deflection of suspension and the dynamic load of wheel. With the increase in lateral partial frequency of PMS, yaw resonance frequency rises, resonance peak goes up but phase angle only has little change.