钢轨模态阶数对高速铁路轮轨高频动力响应的影响研究-《高速铁路技术》

文章信息/Info

Title:: Study on Influence of Rail Modal Order on High Frequency Dynamic Response of High Speed Railway Wheel-rail System

Author(s):: WEI Kai; WANG Ping; NIU Pengbo; Southwest Jiaotong University, Chengdu 610031, China

Keywords:: high-speed railway|rubber pad mechanical model|rail modal|high frequency vibration

摘要:: 为了能更准确计算高速铁路轮轨高频动力响应，本文针对考虑扣件胶垫幅频变动力特性的车辆-轨道垂向耦合动力学模型，研究了钢轨模态阶数对轮轨系统高频动力响应结果的影响。研究结果表明：（1）当扣件胶垫采用幅频变模型时，传统钢轨模态阶数（0.5倍扣件总数）会导致轮轨力、轮对加速度和钢轨加速度时域结果的最大值偏大；（2）钢轨模态阶数的取值对轮轨系统在低频范围的动力仿真结果影响不大；而在中高频段的主频段范围，轮轨系统的动力响应幅值随着钢轨模态阶数的增大而逐渐降低；（3）根据轮轨系统时频域计算结果可知，当扣件胶垫采用幅频变模型时，为准确计算高速铁路轮轨高频动力响应，本文建议将钢轨模态阶数至少应等于轨道结构中的扣件总数。

Abstract:: In order to calculate the high-frequency dynamic response of high-speed railway wheel-rail system more accurately, the effect of rail modal order on the high frequency dynamic response of wheel-rail system is studied based on the vehicle-track vertical coupled dynamic model considering the amplitude-frequency variation dynamic properties of fastening pad in this paper. The results show:(1)When the amplitude-frequency variation model is used for the fastening pad, the modal mode of the traditional rail (0.5 times the number of fasteners) would cause the maximum value of the wheel-rail force, the wheelset acceleration and the rail acceleration time domain results to be large; (2)The value of the modal order of the rail had little effect on the dynamic simulation results of the wheel-rail system in the low-frequency range; In the main frequency range of the middle and high frequency bands, the dynamic response amplitude of the wheel-rail system gradually decreased as the modal order of the rail increased; (3)According to the calculation results of wheel-rail system in time-frequency domain, it was suggested that the rail modal order should be at least equal to the total number of fasteners in the track structure in order to accurately calculatethe high-frequency dynamic response of high-speed railway wheels and rails when the amplitude-frequency variation model is used for the fastening pads.