车辆非线性8-DOF模型的简化分析

Simplification Analysis on the Nonlinear 8-DOF Vehicle Model

在对车辆侧向动力学的研究中,多采用非线性8自由度(8-DOF)模型,但车辆主要的4个自由度(纵向、侧向、横摆和侧倾)运动微分方程在使用中常需要不同程度的简化,针对这些简化形式,建立了完整的非线性8-DOF模型,对比了各类简化项对整车动力学响应特性的影响,最后给出一种合理的最简形式。

Nonlinear eight degree of freedom（ 8-DOF） vehicle model has been widely used to study the motion of vehicle and to develop various vehicle control systems. Referring to many literatures,it was found that the longitudinal,lateral,yaw and roll equations of motion in the 8-DOF model had a large difference. Aiming at these simplification forms,a full nonlinear 8-DOF vehicle model was developed and the effect of different simplified terms on the whole vehicle dynamic response characteristics was discussed. At last,a reasonable simplest form was given.