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建立考虑车轮椭圆化状态下的整车车辆/轨道空间耦合动力学模型,基于此模型,发展相应的数值方法,分析计算高速运行状态下车轮椭圆化程度对车辆系统动态行为的影响,给出车速200～350km/h时车体横移、轮对横移、轮轨垂向力和轮重减载率等关键指标,确定高速行车条件下车轮圆度的临界范围。数值结果分析表明,在车轮椭圆化的情况下,车辆系统动力学响应关键指标与行车速度、车轮的圆度以及轮对左右车轮椭圆形状的相位有密切联系。高速车轮椭圆化将导致车辆系统动力学性能的显著变化,随着车轮圆度的增大,车辆系统运行品质严重恶化,其横向稳定性和轮重减载率大大降低,从而减小车辆/轨道系统各部件使用寿命、增大脱轨风险。
Based on this model, the corresponding numerical method is developed and the influence of the degree of ovalization of the wheel on the dynamic behavior of the vehicle under high-speed running condition is analyzed and calculated, and the vehicle speed 200 ~ 350km / h when the body traversing, wheelset, vertical wheel and rail load and wheel load and other key indicators to determine the critical condition of the roundness of the wheel under high-speed driving conditions. The numerical results show that in the case of elliptical wheel, the key indicators of the dynamic response of the vehicle system are closely related to the driving speed, the roundness of the wheel and the phase of the elliptical shape of the left and right wheels. Ovalization of high-speed wheels will lead to significant changes in the dynamic performance of the vehicle system. As the roundness of the wheels increases, the running quality of the vehicle system deteriorates seriously and its lateral stability and wheel load reduction rate are greatly reduced, thus reducing the vehicle / track System components life, increase the risk of derailment.