G.R. Tomlinson, S.A. Billings

This paper describes higher order frequency response functions (FRFs) and their role in the identification of nonlinear systems. Higher order FRFs only exist for nonlinear systems and have the property that they visually demonstrate bow energy is transferred from one frequency to another, a unique characteristic of nonlinear structures and systems. The determination of these FRFs can be approached from two principal directions; using sine excitation by directly measuring the higher order transfer functions which approximate to higher order FRFs or using nonlinear time series methods and probing these to extract the FRFs. In this paper, these approaches are described in relation to simple nonlinear problems and their role in future system methodologies discussed. It is shown that if reliable higher order spectra can be obtained they offer a positive and useful means of practically diagnosing a class of nonlinear structural dynamics problems.

International Forum on Aeroelasticity and Structural Dynamics 1991, Aachen

Conference Paper

englisch

21,0 x 29,7 cm, 12 Seiten

DGLR-Bericht, 1991, 1991-06, International Forum on Aeroelasticity and Structural Dynamics 1991 Proceedings; S.211-222; 1991; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroelasticity

Bestellbar

1991