Stress spectra and life estimation of key positions of high-speed train car body based on modal method

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (23) : 10-18.

LI Chuanying1, WANG Xiugang1, WU Xingwen2, DONG Xiaohua3, CHI Maoru3

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Abstract

A rigid-flexible coupled high-speed train dynamic model considering the elastic deformation of car body was developed by using the modal synthesis method, and the modal stress recovery method was used to calculate the dynamic stress of car body. By using the proposed dynamic model, different frequency sweep excitations that reflect different operating modes of vehicle were primarily employed to identify the dynamic weak points of the car body, then the influences of the wheel/rail contact condition on the stress spectrum of weak points were investigated considering different wheel/rail equivalent conicities. Moreover, the stress spectrum of weak points for a typical high-speed railway line were obtained through simulation of the proposed dynamic model considering different wheel/rail contact conditions. In addition, different methods used to construct the stress spectrum for weak points were discussed so as to demonstrate the influences of wheel/rail contact condition on the fatigue life of car body. The results suggest that the frequency sweep method together with the modal stress recovery method can be used to identify the dynamic weak point in the car body under the service condition. The degradation process of wheel/rail contact during the reprofiling cycle can significantly deteriorate the operational stability of vehicle, thereby increase the stress amplitude of weak points. Therefore, it is desirable to consider the degradation process of wheel/rail contact in the estimation of fatigue lifetime of weak points in the car body.
Key words：High frequency rigid-flexible coupled dynamic model of high-speed train, Modal stress recovery method, Dynamic week position, Characteristic stress spectrum, Equivalent conicity of wheel/rail contact

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LI Chuanying1, WANG Xiugang1, WU Xingwen2, DONG Xiaohua3, CHI Maoru3. Stress spectra and life estimation of key positions of high-speed train car body based on modal method[J]. Journal of Vibration and Shock, 2022, 41(23): 10-18

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