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Multicracks identification in beams based on moving harmonic excitation
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 Title & Authors
Multicracks identification in beams based on moving harmonic excitation
Chouiyakh, Hajar; Azrar, Lahcen; Alnefaie, Khaled; Akourri, Omar;
A method of damage detection based on the moving harmonic excitation and continuous wavelet transforms is presented. The applied excitation is used as a moving actuator and its frequency and speed parameters can be adjusted for an amplified response. The continuous wavelet transforms, CWT, is used for cracks detection based on the resulting amplified signal. It is demonstrated that this identification procedure is largely better than the classical ones based on eigenfrequencies or on the eigenmodes wavelet transformed. For vibration responses, free and forced vibration analyses of multi-cracked beams are investigated based on both analytical and numerical methodological approaches. Cracks are modeled through rotational springs whose compliances are evaluated using linear elastic fracture mechanics. Based on the obtained forced responses, multi-cracks positions are accurately identified and the CWT identification can be highly improved by adjusting the frequency and the speed excitation parameters.
multi-cracks identification;wavelet transform;differential quadrature method;moving harmonic excitation;free and forced vibration;
 Cited by
Vibration and multi-crack identification of Timoshenko beams under moving mass using the differential quadrature method, International Journal of Mechanical Sciences, 2017, 120, 1  crossref(new windwow)
Multi-cracks identification based on the nonlinear vibration response of beams subjected to moving harmonic load, MATEC Web of Conferences, 2016, 83, 06003  crossref(new windwow)
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