- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | YANG Fei, WU Xishui, SUN Xianfu, WEI Zilong, KE Zaitian, YANY Aihong. Dynamic Response Characteristics of EMU under Excitation of Rail Straightening Irregularity[J]. Journal of Southwest Jiaotong University, 2022, 57(2): 267-276, 294. doi: 10.3969/j.issn.0258-2724.20210481
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A section on a ballasted passenger dedicated line is targeted, where the periodic longitudinal unevenness occurs with the wavelength of 3.2 m, leading to vehicle shaking. Based on the synchrosqueezed wavelet transform, the time-frequency distribution of the dynamic and static track geometry detection data before and after machine tamping is extracted. Combined with the analysis on rail straightening process, the causes of periodic longitudinal unevenness are clarified, which may be caused by poor composite straightening process in rail rolling. On this basis, the relationship between rail straightening irregularity, vibration acceleration of vehicle components, and wheel rail contact force are explored, and the influence of rail straightening irregularity on vehicle dynamic performance is obtained. The results show that the coherence functions of vertical accelerations at axle box, bogie and car body are 0.97, 0.96 and 0.76 respectively, which increase 5%, 25% and 300% respectively than that on the normal section. The coherence function of wheel rail vertical force is increased by 42% to 0.94, revealing that straightening irregularity is closely related to the vibration response of vehicle components and wheel-rail contact force. Due to straightening irregularity, the RMS value of vertical acceleration at axle box and car body are amplified by about 1.00 m/s2 and 0.05 m/s2 respectively. Straightening irregularity has a strongest linear correlation with the RMS values of vertical accelerations at axle box and wheel-rail vertical force with the correlation coefficients of 0.9 and 0.8 respectively.
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