Fatigue life prediction of bogie frames under random vibration based on the multi-dimensional and multi-support pseudo excitation method

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (22) : 192-197.

WANG Tengfei1,XIAO Feixiong1,JIA Hongyu2,YIN Hao1

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Abstract

In order to analyze the dynamic responses of railway vehicles under the random excitation from track irregularity, a multi-dimensional and multi-support pseudo excitation method was proposed.The finite model of a metro train considering the interaction among the car body, frame and wheelset was established, in which a large mass was set at the excitation place and subjected to the excitation of the derived multi-dimensional and multi-support force power spectral density matrix.Then the motion equations of railway vehicles were directly solved by using the absolute displacement method.Finally, the three-interval method was used to predict the fatigue life of bogie frame welds.The results show that the rigid modes of bounce, yaw, pitch and the elastic mode of torsion of the bogie frame have great influence on its fatigue life.The results indicate that the vibration fatigue calculation method based on multi-dimensional and multi-support pseudo excitation method can avoid the tedious calculation for the quasi-static matrix by the traditional virtual excitation method, and solve the dynamic responses of vehicles more efficiently and quickly.The study provides a new way for improving the fatigue resistance capability and the optimum design of bogie frames from the aspect of stiffness coordination.

Key words

pseudo excitation method / multi-dimensional and multi-support / absolute displacement / random vibration / fatigue life

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WANG Tengfei1,XIAO Feixiong1,JIA Hongyu2,YIN Hao1. Fatigue life prediction of bogie frames under random vibration based on the multi-dimensional and multi-support pseudo excitation method[J]. Journal of Vibration and Shock, 2020, 39(22): 192-197

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