变形路面上越野汽车悬架优化的仿真分析

为了提高越野汽车的平顺性，研究了不同类型越野路面变形程度与悬架振动参数之间的关系.应用载荷沉陷理论建立了地面非线性离散模型.综合动态轮胎力、悬架动挠度、越野地面沉陷等因素建立了简化越野车辆模型的动力学方程.通过改变土壤类型和越野路况，对松软路面上悬架参数与车身垂向加速度的关系进行仿真.以平顺性为目标，分析了松软路面不同变形程度对优化的悬架阻尼值的影响.仿真结果表明，增大系统刚度比可以显著减小车身垂向加速度，但刚度比不宜超过临界值；在变形较大的路面上行驶时，应采用较大的悬架阻尼以改善平顺性.

Simulation of suspension optimization for off-road vehicle on sinkable terrain

In order to improve the ride comfort of off-road vehicles, analysis of the relation between different off road terrains deformation and suspension parameters was proposed. The non-linear discrete model of sinkage terrain was set up using the load sinkage theory. The dynamics equations of simplified off-road vehicle model were set up according to the dynamic tyre force, suspension deflection and off-road terrain sinkage. By changing the soil types and off-road terrain conditions, the relation between suspension parameters and vehicle body acceleration on soft terrain was simulated. The terrain deformation influence on the optimum dump was analyzed aiming achieve to the riding comfort on soft terrain. The simulation results show that the vertical acceleration of the vehicle body decreases observably with increasing of stiffness ratio, but that the stiffness ratio should be limited to a critical value. Larger suspension damp should be adopted on larger deformation terrain for improving riding comfort.