基于横向载荷转移量的客车侧倾稳定性分析

针对客车侧倾稳定性问题,建立了基于横向载荷转移七自由度动力学模型,并根据所获得实车试验数据验证了所构建模型的合理性.根据所构建的具有横向载荷转移七自由度动力学模型进行了不同车速下转向盘转角阶跃仿真,分析客车结构参数和车速对其侧翻稳定性的影响.仿真结果表明:客车后轮驱动轴为侧倾稳定性的危险车轴,当车速过高或前轮转角过大时,后轴首先离地.增大各轴轮距、降低簧上质量质心高度、提高客车悬架侧倾刚度,能够有效的提高客车的侧倾稳定性.

Roll Stability Analysis of Passenger Car Based on Lateral-load Transfer Rate

A dynamics model of passenger car with seven freedoms considering lateral-load transfer rate was set up to deal with roll stability. The constructed model proves to be rational through vehicle road tests. According to the model, the simulation of steering wheel angle step input with different speeds was conducted, and the factors of roll stability were analyzed by the construction parameters and speed. The simulation result of Matlab shows that the driving axle of the passenger car is the dangerous axle, and when the speed or steering angle exceeds the threshold value it lifts off firstly. The roll stability of the passenger car can be promoted by enlarging track, reducing the center height of sprung mass and enhancing suspension roll stiffness.