Open Access

ARTICLE

Experimental and Numerical Study of Structural Identification Using Non-Linear Resonant Decay Method

Mehdi Sarmast^1,*, Hamed Ghafari², Jan R. Wright³

1 Kennesaw State University, Department of Mechanical Engineering, MD 9075 840 Polytechnic Lane Marietta, GA 30060, USA.
2 Malek Ashtar University of Technology, Department of Aerospace Engineering, Lavizan, Tehran 15875, Iran.
3 School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 9PL, UK.
* Corresponding Author: Mehdi Sarmast. Email: msarmast@kennesaw.edu.

Sound & Vibration 2019, 53(3), 75-95. https://doi.org/10.32604/sv.2019.04193

Abstract

One of the practical approaches in identifying structures is the non-linear resonant decay method which identifies a non-linear dynamic system utilizing a model based on linear modal space containing the underlying linear system and a small number of extra terms that exhibit the non-linear effects. In this paper, the method is illustrated in a simulated system and an experimental structure. The main objective of the non-linear resonant decay method is to identify the non-linear dynamic systems based on the use of a multi-shaker excitation using appropriated excitation which is obtained from the force appropriation approach. The experimental application of the method is indicated to provide suitable estimates of modal parameters for the identification of non-linear models of structures.

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Keywords

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