地基刚度变化对车辆动力特性的影响

Dynamic Analysis of Vehicle-road Vertical Coupled System on Rough Road

根据两自由度车辆振动模型和道路多层离散体系模型，建立了车辆一道路垂向耦合动力分析模型，推导出了车辆一道路系统的动力平衡方程组，并对动力平衡方程组进行了编程求解，分析了地基刚度变化对车辆动荷载和车身加速度的影响。分析表明：地基刚度变化对车身加速度影响不大，在地基刚度达到某一临界值后一定的范围内，地基刚度的变化对动荷系数影响也不再显著，否则，要对地基进行处理。

By simplifying the vehicle to a two DOF vibration system and using the FEM method to establish the multilayer discrete road system ,a model of vehicle-road vertical coupled system was built, and the dynamic equilibrium equation of vehicle-road system was introduced. Solved by programming, the effect of vehicle dynamic loads and vertical vehicle acceleration by the stiffness change of ground was analyzed. Results show that the stiffness change of grouted has little effect on vertical vehicle acceleration, and when the stiffness of ground is greater than a critical value, the stiffness change of ground also has little effect on the coefficient of dynamic loads ,otherwise, it needs to reinforce the ground.