Wheel Gamma Degradation Process Based on Copula Function

doi:10.12068/j.issn.1005-3026.2021.04.013

Abstract

Abstract: The wear process of the wheel flange and the rolling circle diameter was described by the Gamma random process， and the method of calculating the reliability of the wheel flange degradation and the rolling circle diameter degradation was studied by using the Copula function and the fourth-order moment method， and the dynamic indexes of the train at different stages were obtained by dynamics software simulation. The reliability of the wheel degradation process with a rotation cycle of 200，000 km and the sensitivity of the wheel diameter degradation process were studied. The correctness of the method was verified by Monte Carlo simulation (MCS).The results showed that the reliability of wheels reaching the expected life is high when the rotation cycle is 200，000 km， and the reliability calculated based on the Copula function correlation failure degradation model is higher than that calculated by the independent failure model. The sensitivity study of the wheel diameter degradation reliability model indicates that the scheme with less reduction of wheel diameter should be selected during the rotation repair.

Key words: Gamma process; degradation process; fourth-order moment; rotation period; reliability maintenance

CLC Number:

TH113

LYU Hao， JIN Xiong-cheng， LIN Lu-yang. Wheel Gamma Degradation Process Based on Copula Function[J]. Journal of Northeastern University(Natural Science), 2021, 42(4): 544-550.

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