Analysis of sensitivity and robustness for resonance frequencies and response levels of gas-turbine structures with nonlinear contact interfaces

摘要

An effective method has been developed to calculate sensitivity and robustness of the resonance peak frequency and forced response level to variation of parameters of nonlinear friction contact interfaces and excitation. The method allows determination of the sensitivities and robustness measure simultaneously with the resonance peak frequency and response level calculated as a function of any parameter of interest and without significant computational expense. Capabilities and high efficiency of the method proposed are demonstrated on examples of analysis of large-scale finite element models of realistic bladed discs with major types of the nonlinear contact interfaces.