关键词: 道路工程, 重载车辆, 不平整路面, 车辆路面耦合动力学模型, MATLAB, 动荷载响应

Abstract: In order to study the vibration response of heavy vehicles on the uneven pavement more accurately, the pavement coupling dynamic model of seven degrees of freedom (1+1+5) of the four-axle heavy vehicle was established, and the proposed model was decomposed and simplified into two DOF and one three DOF vehicle vibration models. And the dynamic load of the vehicle was calculated by programming with the help of MATLAB mathematical calculation software. The results show that: because of the vibration response of vehicle on uneven road surface, the trailer rear wheel of four-axle heavy vehicle produces the greatest dynamic load, and the difference between the front wheel and rear wheel of trailer is small, so the change trend is relatively flat. There are two peaks of vehicle dynamic load with the increase of the wavelength of road roughness. When the wavelength of road roughness increases to a certain extent, the maximum dynamic load approaches the self-weight of the vehicle vibration system, and it can be considered that the road surface tends to be flat. The pavement amplitude has rather a great influence on the dynamic load, and the maximum dynamic load is positively correlated with the amplitude. Overload is the main “killer” affecting the service life of road. In order to avoid further damage of the road and increase the service life, the relevant departments should strictly control the phenomenon of overload of vehicles.

Key words: highway engineering, heavy vehicle, uneven pavement, vehicle pavement coupling dynamic model, MATLAB, dynamic load response