Model and vibration analysis of heavy vehicle in frequency region

In order to assess the influence of the operating parameters on the heavy vehicle (HV) vibrations in the frequency region, a HV’s vibration model using 9-DOF is built to calculate the vibration equations in the time region. HV’s vibration equations are then converted from the time region to the frequency region via the Laplace-transfer-function. The change of the operating parameters such as the wavelength of the road, traveling velocity of HV, mass of HV, and stiffness of HV suspensions has been simulated for analyzing the results. The research result reveals that the resonant frequencies of HV are not affected under different operating conditions of HV. To ameliorate HV’s ride comfort, the road’s wavelength S needs to be designed by S >25 m while the stiffness coefficients of HV’s suspension system should be reduced by 0.6 K . Additionally, under the operation conditions of HV, the moving velocity below 60 km/h and two load cases of the half load and full load should be maintained to optimize the ride comfort of HV. This study contributes to clarifying the influence of parameters on the vibration characteristics of vehicles in more detail, thereby providing optimal design methods for both the vehicle and road surface to improve the working efficiency of vehicles.