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| Contact and creep characteristics of wheel-rail system under harmonic corrugation excitation |
| Received:February 10, 2020 Revised:May 31, 2020 |
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| DOI：10.7511/jslx20200210002 |
| KeyWord:railway engineering harmonic excitation coupled dynamics wheel-rail contact creepage/creep force corrugation development |
| Author | Institution |
| 王志强 |
1. 同济大学 铁道与城市轨道交通研究院, 上海 ;
2. 上海市轨道交通结构耐久与系统安全重点实验室, 上海 |
| 雷震宇 |
1. 同济大学 铁道与城市轨道交通研究院, 上海 ;
2. 上海市轨道交通结构耐久与系统安全重点实验室, 上海 |
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| Abstract: |
| 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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