快速货车横向运动稳定性分析与分岔研究

摘要

A nonlinear mathematical model for the high-speed truck system with 19 degrees of freedom is built in this paper.Nonlinear factors are taken into account, such as dry friction in the system and the interaction between wheels, during the construction of model.Kalker′s linear creep theory is used to calculate the creep force.The stability of serpentine movement and bifurcation problems under the condition of hypervelocity are studied by the numerical method.The numerical results show that this method can obtain the system′s critical speed of instability in the serpentine movement, which provides a theoretical basis for further improving the lateral stability and designing running parts of the high-speed truck.%建立了19自由度快速货车系统的非线性数学模型,考虑了系统中的干摩擦力和轮轨相互作用关系等非线性因素,利用Kalker线性蠕滑理论计算轮轨间接触蠕滑力,应用数值方法对整车系统的蛇行运动稳定性与超高速情况下的分岔问题进行了研究.数值结果表明,该方法可以得出货车系统蛇行失稳的临界速度,为进一步改善货车横向稳定性性能及设计高速货车走行部提供了理论依据.