Nonlinear structural identification by the "reverse Path" spectral method

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Author(s): Martin Magnevall, Andreas Josefsson, Kjell Ahlin, Göran Broman
Title: Nonlinear structural identification by the "reverse Path" spectral method
Journal: Journal of Sound and Vibration
Year: 2012
Volume: 331
Issue: 4
Pagination: 938-946
ISSN: 0022-460X
Publisher: Elsevier
URI/DOI: 10.1016/j.jsv.2011.10.029
ISI number: 000302038500014
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Mechanical Engineering (Sektionen för ingenjörsvetenskap - avd. för maskinteknik)
School of Engineering S- 371 79 Karlskrona, School of Engineering S- 371 79 Karlskrona
+46 455 38 50 00
Language: English
Abstract: When dealing with nonlinear dynamical systems, it is important to have efficient, accurate and reliable tools for estimating both the linear and nonlinear system parameters from measured data. An approach for nonlinear system identification widely studied in recent years is "Reverse Path". This method is based on broad-band excitation and treats the nonlinear terms as feedback forces acting on an underlying linear system. Parameter estimation is performed in the frequency domain using conventional multiple-input-multiple- output or multiple-input-single-output techniques. This paper presents a generalized approach to apply the method of "Reverse Path" on continuous mechanical systems with multiple nonlinearities. The method requires few spectral calculations and is therefore suitable for use in iterative processes to locate and estimate structural nonlinearities. The proposed method is demonstrated in both simulations and experiments on continuous nonlinear mechanical structures. The results show that the method is effective on both simulated as well as experimental data.
Subject: Mechanical Engineering\General
Mechanical Engineering\Structural Dynamics
Keywords: Dynamical systems Estimation, Frequency estimation;