三轴重载车辆模型垂向和侧向联合动力学研究

VERTICAL AND LATERAL DYNAMICS OF THREE-AXLE HEAVY-DUTY VEHICLE MODEL

首先建立了三轴重型车辆模型的垂向动力学模型,路面随机激励采用滤波白噪声法生成,结合魔术公式轮胎模型建立了其侧向动力学模型;然后通过轮胎的动态垂向载荷将车辆垂向和侧向动力学模型联合起来,提出三轴重型车辆垂向侧向联合的整车动力学模型;在Matlab/Simulink中实现以上模型的仿真分析。计算结果表明:独立的车辆垂向和侧向动力学模型虽然可以反映车辆的平顺性和操纵稳定性,但是联合模型下的车辆横摆角速度、质心侧偏角及侧向加速度的最大值比独立侧向模型的都偏小,联合模型能体现车辆垂向运动对侧向运动的影响,这对车辆在联合复杂工况时性能优化有一定的参考价值。

A vertical dynamics model for the three-axle heavy-duty vehicle is firstly established,and the road surface random excitation is generated using the filtered white noise method.Based on a magic formula tire model,a vehicle lateral dynamics model for the three-axle heavy-duty is established.Then a vertical-lateral coupling dynamics model for the three-axle heavy-duty vehicle is established.The vertical dynamical load of the tires is used to couple the vertical dynamics model to the lateral dynamics model.The dynamic coupling vertical-lateral model is implemented in Matlab/Simulink.The simulation results show that the independent vehicle vertical and lateral dynamics model can reflect the ride and handling stability of the vehicle to a certain extent.But the maximum values of the yaw rate,the side-slip angle,and the lateral acceleration of the coupling model are all smaller than those obtained with the independent lateral model.The coupling model for the three-axle heavy-duty vehicle can reflect the impact of the vehicle’s vertical motion on the lateral motion.It can be used for the optimization of the vehicle performance under the complex working conditions.