Journal
COMPTES RENDUS MECANIQUE
Volume 346, Issue 2, Pages 110-120Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crme.2017.11.008
Keywords
Crack detection; Vibration analysis; Particle swarm optimization; Finite element method; Experimental modal analysis
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In this paper, a technique is presented for the detection and localization of an open crack in beam-like structures using experimentally measured natural frequencies and the Particle Swarm Optimization (PSO) method. The technique considers the variation in local flexibility near the crack. The natural frequencies of a cracked beam are determined experimentally and numerically using the Finite Element Method (FEM). The optimization algorithm is programmed in MATLAB. The algorithm is used to estimate the location and severity of a crack by minimizing the differences between measured and calculated frequencies. The method is verified using experimentally measured data on a cantilever steel beam. The Fourier transform is adopted to improve the frequency resolution. The results demonstrate the good accuracy of the proposed technique. (C) 2017 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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