In the structural reliability analysis of bogie frame,the failure probability of variable load condition in the design pro-cess is helpful to improve the rationality of the structure.This research firstly used the results of finite element analysis(FEA)and design experiment(DOE)to establish a polynomial response surface(PRS)proxy model of the bogie frame.Based on the theory of stress intensity interference,the functional function of the bogie frame under variable load conditions was established.On this ba-sis,a polynomial response surface proxy model(PRS-update)considering uncertain factors was proposed to characterize the de-sign parameters and the function relationship between the responses.And the use of subset simulation(SS)method to calculate the failure probability,the unimodal and bimodal boundaries were introduced into the structural reliability analysis of the bogie frame.In addition,the Monte Carlo simulation(MCS)comparison results verified the accuracy of the PRS-update model in ana-lyzing the reliability of the bogie structure.
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