A functional series expansion method for response analysis of nonlinear systems subjected to random excitations (Q580038)

A Wiener-Hermite functional series expansion method for response analysis of nonlinear systems under random excitations is presented. The formal procedure for the derivation of the deterministic equations governing the Wiener-Hermite kernel functions is described. A single-term expansion is used to analyze the non-stationary responses of a damped Duffing oscillator subjected to several modulated white noises. An iterative procedure for evaluating the kernel functions and the mean-square responses of the Duffing oscillator is developed. For several values of nonlinearity strength and different damping coefficients the non- stationary variances and autocorrelations of the response are obtained. The results are compared with those found by the digital simulations and the existing methods.