考虑高速公路横向坡道转向行驶操纵稳定性的汽车轴距和轮距分析

为分析汽车轴距和轮距设计对操纵稳定性的影响,建立高速公路横向坡道转向行驶的汽车转向动力学模型,并在MATLAB/Simulink软件中建立相应的仿真模型.采用某型汽车设计轴距和轮距进行仿真,得到以不同速度在不同横向坡度道路上转向行驶时的横摆角速度、侧向加速度和质心侧偏角.根据该型汽车的转向特性和侧翻阈值评价其在高速公路横向坡道转向行驶时的操纵稳定性,结果表明该型汽车的设计轴距和轮距满足操纵稳定性要求.计算方法和仿真结果对整车设计具有指导意义.

Vehicle wheel base and wheel track analysis considering handling stability of steering on transverse slope highway

To analyze the influence of the wheel base and wheel track design on the vehicle handling stability, the dynamic model of vehicle steering on the transverse slope highway is established, and the corresponding simulation model is built in MATLAB/Simulink. The design values of wheel base and wheel track of the type of vehicle are used for simulation, and then the yaw rate, the lateral acceleration and the sideslip angle of the mass center are obtained while the vehicle steers on the highway with different transverse slopes at different speeds. The handling stability of the vehicle steering on the transverse slope highway is tested according to the steering characteristics and rollover threshold of the vehicle. The results show that the design values of wheel base and wheel track of the type of vehicle meet the handling stability. The calculation method and simulation results can guide the vehicle design direction.