【摘要】 为了寻求基于目标的铁路车辆车轮踏面数值优化技术,开发一种考虑轮轨法向间隙参数的车轮踏面优化方法。利用该方法优化我国高速列车车轮LMa型面。并发现优化后的LMa车轮和CHN60钢轨滚动接触接触时,轮轨界面之间具有较好的"共形"特性,这样能有效降低轮轨接触应力以达到降低滚动接触疲劳目的。并用车辆轨道耦合动力学理论分析优化的车轮型面对车辆动态特性的影响。数值结果表明,在不降低车辆动力学性能的情况下,此方法可以有效改善轮轨接触点对分布,降低轮轨接触应力。更多还原

【Abstract】 A new optimization method is put forward for railway wheel profiles based on the target function including using wheel/rail normal gap as parameters.Taking the wheel/rail counterpart,LMa/CHN60 of China railway at high speed,as an example,the new optimization method is used to improve the profile of LMa.It is found that the improved profile of LMa by using this method is in good conformal contact with CHN60 rail,which reduces wheel/rail contact stress and rolling contact fatigue.The coupling dynamics theory of the vehicle and track is also used to investigate the effect of the improved profile on the dynamical behavior of the railway vehicle.The numerical results show that the distribution of the contact points of the wheel and rail is relatively uniform and extensive on the wheel tread and the rail top,compared to the LMa in contact with CHN60 rail,and the maximum normal pressure of the wheel/rail can be reduced effectively without sacrificing the dynamic performance.更多还原