In order to analyze the influence of random and impulse road surface on the smoothness of commercial vehicles, a commercial vehicle is taken as the research object to construct the vehicle dynamics model containing front and rear suspension, tire, body, steering system and human body-seat system by using the ADAMS/Car software. The smoothness analysis of impulse and random input is carried out for the vehicle, and simulation results show that the smoothness of the vehicle increases after increasing the vehicle speed under the excitation of pulse road surface; the effect of smoothness is more significant on Class C road compared with Class B road under the random road surface input condition, which is more effective in the evaluation and improvement of driving comfort of commercial vehicles.

Commercial vehicles  /  ADAMS/Car  /  Smoothness  /  Pulse road surface  /  Random road surface