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Structural Engineering and Mechanics Volume 58, Number 6, June25 2016 , pages 1087-1107 DOI: https://doi.org/10.12989/sem.2016.58.6.1087 |
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Multicracks identification in beams based on moving harmonic excitation |
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Hajar Chouiyakh, Lahcen Azrar, Khaled Alnefaie and Omar Akourri
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| Abstract | ||
| 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. | ||
| Key Words | ||
| multi-cracks identification; wavelet transform; differential quadrature method; moving harmonic excitation; free and forced vibration | ||
| Address | ||
| Hajar Chouiyakh: Mathematical Modeling and Control, Faculty of Sciences and Techniques of Tangier, Abdelmalek Essaâdi University, Tangier, Morocco Lahcen Azrar: Mathematical Modeling and Control, Faculty of Sciences and Techniques of Tangier, Abdelmalek Essaâdi University, Tangier, Morocco; LaMIPI, Higher School of Technical Education of Rabat (ENSET), Mohammed V University in Rabat, Morocco; Department of Mechanical Engineering, Faculty of Engineering, King Abdulaziz University, Jeddah, Saudi Arabia Khaled Alnefaie: Department of Mechanical Engineering, Faculty of Engineering, King Abdulaziz University, Jeddah, Saudi Arabia Omar Akourri: Mathematical Modeling and Control, Faculty of Sciences and Techniques of Tangier, Abdelmalek Essaâdi University, Tangier, Morocco | ||