Reliability analysis of intermediate casing based on adaptive Kriging
In order to explore the structural reliability analysis method of the intermediate casing under multiple failure modes,a parametric finite element model was established for the deterministic analysis of an aero-engine intermediate casing.Considering the uncertainty of material properties,geometric parameters and external loads of the aero-engine intermediate casing,the limit state functions were constructed for the two most typical failure modes of the intermediate casing:static strength failure and stiffness failure.By constructing an adaptive Kriging(AK)surrogate model for two failure modes and combining with the generalized subset simulation(GSS)method,the failure probability of the intermediate casing structure was predicted.And the correlation of the two failure modes was modeled based on the Copula function theory to determine the mutual influence between them,and the calculation results were compared with AK-GSS method.The results showed that the failure probability of the intermediate casing structure system was in the order of 10-6.Compared with the conventional method,the computational time of the AK-GSS method for solving the failure probability was reduced by 87.7％almost without loss of computational accuracy.In addition,the AK-GSS method still had high accuracy when considering the correlation between the two failure modes of the intermediary magazine.
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