Power Spectral Density of Nonlinear System Response: The Recursion Method

[+] Author and Article Information
R. Valéry Roy

Department of Mechanical Engineering, University of Delaware, Newark, DE 19716

P. D. Spanos

Rice University, Houston, TX 77251

J. Appl. Mech 60(2), 358-365 (Jun 01, 1993) (8 pages) doi:10.1115/1.2900801 History: Received January 27, 1992; Revised June 04, 1992; Online March 31, 2008


Spectral densities of the response of nonlinear systems to white noise excitation are considered. By using a formal solution of the associated Fokker-Planck-Kolmogorov equation, response spectral densities are represented by formal power series expansion for large frequencies. The coefficients of the series, known as the spectral moments, are determined in terms of first-order response statistics. Alternatively, a J -fraction representation of spectral densities can be achieved by using a generalization of the Lanczos algorithm for matrix tridiagonalization, known as the “recursion method.” Sequences of rational approximations of increasing order are obtained. They are used for numerical calculations regarding the single-well and double-well Duffing oscillators, and Van der Pol type oscillators. Digital simulations demonstrate that the proposed approach can be quite reliable over large variations of the system parameters. Further, it is quite versatile as it can be used for the determination of the spectrum of the response of a broad class of randomly excited nonlinear oscillators, with the sole prerequisite being the availability, in exact or approximate form, of the stationary probability density of the response.

Copyright © 1993 by The American Society of Mechanical Engineers
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