| 王志强,雷震宇.谐波型波磨激扰下轮轨系统接触蠕滑特性[J].计算力学学报,2020,37(6):735~742 |
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| 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 |
| 投稿时间：2020-02-10 修订日期：2020-05-31 |
| DOI：10.7511/jslx20200210002 |
| 中文关键词: 铁道工程 谐波激扰 耦合动力学 轮轨接触 蠕滑率/力 波磨发展 |
| 英文关键词:railway engineering harmonic excitation coupled dynamics wheel-rail contact creepage/creep force corrugation development |
| 基金项目:国家自然科学基金（11772230）资助项目. |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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. |
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