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The experimental validation of a structural health monitoring system based on the peculiar nonlinear dynamic response of cracked structures is proposed in this letter. The higher order harmonic response signal is a technique which allows detecting the location of a breathing crack taking advantage of the nonlinear dynamic response proper of a cracked structure. The experimental results show that information carried by the nonlinear harmonics allow detecting the structural damage without requiring a baseline signal of the healthy structure.
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Semperlotti et al. (2009) studied this question.
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