Linked reliability analysis of aeroengine blisk with dual extreme response surface method

In order to more accurately predict the effects of deformation and stress on the performance of aeroengine blisk, a method of reliability analysis called DERSM (Dual Extremum Response Surface Method) was proposed based on the theory of turbulence model and the fluid field model of aeroengine blisk. Considering gas pressure and centrifugal force, the maximum deformation and stress were taken as the objects of blisk reliability analysis with respect to the reasonable random input variables. Extreme response surface equation is respectively fitted to the sample data acquired by extracting the random variables. The reliability probability of aeroengine blisk was obtained by using Monte Carlo method and linkage sampling to two extreme response surfaces. The simulation results show that the reliability degree is 98.61% when the maximum allowable deformation of bladed disk is 4.2 mm and the maximum allowable stress is 7.5×10²MPa. Compared with ERSM (Extremum Response Surface Method), it is demonstrated that the computational efficiency of DERSM increased by 23.52% while keeping the calculation precision. The validity of reliability analysis of blisk based on DERSM is verified.