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通过MATLAB软件模拟平顶型不平顺,作为机车模型的外部激扰输入,根据机车动力学理论,以机车轮轨动力指标为依据,运用SIMPACK多体动力学仿真软件,分析了小跨度桥的局部平顶型不平顺的幅值A、与不平顺波长相关的系数K和平顶长度L对轮轨系统动力性能的影响,给出了80~160 km/h速度下,轮轨垂向力、轮重减载率等重要指标,确定出危险速度。仿真结果表明,平顶型不平顺的幅值A和不平顺的系数K的增大,对机车的轮轨垂向力最大值和轮重减载率最大值都有不同程度的影响;但平顶长度L对机车的轮轨垂向力最大值和轮重减载率最大值几乎没有影响。
According to locomotive dynamics theory, based on the locomotive wheel and rail dynamic indexes, SIMPACK multi-body dynamics simulation software was used to analyze the part of the small span bridge The influence of flat top irregularity amplitude A, coefficient K related to uneven wavelength and flat top length L on the dynamic performance of the wheel-rail system is given. The vertical wheel-rail force, Reload rate and other important indicators, determine the dangerous speed. The simulation results show that the increase of the maximum value of the wheel-rail vertical force and the maximum load-shedding rate of the locomotive has an effect on the increase of the flat-top irregularity amplitude A and the non-smooth coefficient K; however, The top length L has almost no effect on the maximum wheel-rail vertical force and the maximum wheel loading rate.