Non-stationary state vibration fatigue strength of high-speed train equipment compartment apron board under aerodynamic load

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (9) : 36-42.

CHENG Yajun1,2, YANG Mingzhi1, LIU Letian3, YU Chunyang2, LI Fansong3

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Abstract

The skirt board of the high-speed train equipment cabin plays an important role in improving the aerodynamic performance of the train. In addition to being subjected to vibration loads, the skirt board also bears a large aerodynamic load. As the operating speed continues to increase, the aerodynamic load borne by the skirt board becomes stronger and stronger. To ensure the normal operation of high-speed trains, fatigue assessment of the skirt board is particularly important. This article focuses on the non-steady-state vibration characteristics of the skirt board under the action of aerodynamic loads, using measured aerodynamic loads as input to obtain impulse response function (IRF) using finite element simulation, and using time-domain convolution integral method to calculate the acceleration at the acceleration measurement point. The model is verified by comparing with experimental data, and the comparison results show that the overall error is less than 10%. Then this method is used to calculate the dynamic stress of the concerned unit, and it is evaluated through the vibration fatigue strength analysis method. The evaluation results show that the fatigue strength of the skirt can meet the requirements of trains with speed of 400 km/h.

Key words

vibration fatigue strength / non-stationary / apron board / aerodynamic load

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CHENG Yajun1,2, YANG Mingzhi1, LIU Letian3, YU Chunyang2, LI Fansong3. Non-stationary state vibration fatigue strength of high-speed train equipment compartment apron board under aerodynamic load[J]. Journal of Vibration and Shock, 2024, 43(9): 36-42

References

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