谐波型波磨激扰下轮轨系统接触蠕滑特性

Contact and creep characteristics of wheel-rail system under harmonic corrugation excitation

将钢轨波浪形磨耗理想化为三种波长和波深组合的连续谐波激扰,通过多体动力学软件UM,分析不同波长和波深工况下谐波激扰对轮轨接触蠕滑特性的影响。研究表明,当波长固定、波深增大时,钢轨轮对垂向振动加速度和纵向蠕滑率/力的平均值均增大,横向蠕滑率/力平均值均减小。当波深固定、波长增大时,钢轨轮对垂向振动加速度平均值和纵向蠕滑率/力平均值均减小,横向蠕滑率/力平均值均增大。纵横向蠕滑率/力均含有与初始不平顺频率值相接近的特征频率成分,纵向蠕滑率/力特征频率随着波深的增大趋向高频段发展,横向蠕滑率/力特征频率集中在低频段,且随着波深增大逐渐减小。当波深为0.3 mm时,纵横向蠕滑率/力强度相当,能量主要集中在低频,频率比较单一;当波深达到0.6 mm和0.9 mm时,蠕滑率/力以纵向蠕滑率/力为主,表现出多频率特征。在波长相同的条件下,随着运营时间的增加,磨耗量在低频段增加较小,在中高频段增加较大。

Taking rail corrugation as an ideal continuous harmonic excitation with the combination of three wavelengths and wave depths,the influence of harmonic excitation on the contact and creep characteristics of wheel-rail interface under different wavelengths and wave depths was analyzed by using multi-body dynamics software UM.The results show that,when the wavelength is fixed and the wave depth increases,the average values of vertical vibration acceleration of the rail and wheelset and longitudinal creepage/creep force of wheel-rail increase,while the average value of transverse creepage/creep force decreases.When the wave depth is fixed and the wavelength increases,the average values of vertical vibration acceleration of the rail and wheelset and longitudinal creepage/creep force decrease,while the average value of transverse creepage/creep force increases.Both longitudinal and transverse creepages/creep forces contain the characteristic frequency component close to the initial irregularity frequency.The longitudinal creepage/creep force characteristic frequencies tend to shift to the high frequency band with the increase of wave depth,while the transverse creepage/creep force characteristic frequencies concentrate in the low frequency band and decrease with the increase of wave depth.When the wave depth is 0.3 mm,the intensities of longitudinal and transverse creepages/forces are the same,the energy is mainly concentrated in the low frequency band,and the characteristic frequencies are relatively single.When the wave depth reaches 0.6 mm and 0.9 mm,the longitudinal creepage/creep force becomes the main one,showing multi-frequency characteristics.Under the same wavelength condition,with the increase of operation time,the wear increases slightly in the low frequency band,but greatly in the middle and high frequency bands.