Mechanics & Industry
Volume 18, Number 8, 2017
Experimental Vibration Analysis
|Number of page(s)||18|
|Published online||28 May 2018|
Damage detection methodology on beam-like structures based on combined modal Wavelet Transform strategy
INSA Centre Val de Loire Laboratoire de Mécanique et Rhéologie,
3 rue de la Chocolaterie,
2 Universidad Nacional de Rosario (UNR), Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Rosario, Argentina
* e-mail: firstname.lastname@example.org
Accepted: 16 January 2018
Different approaches on the detection of damages based on dynamic measurement of structures have appeared in the last decades. They were based, amongst others, on changes in natural frequencies, modal curvatures, strain energy or flexibility. Wavelet analysis has also been used to detect the abnormalities on modal shapes induced by damages. However the majority of previous work was made with non-corrupted by noise signals. Moreover, the damage influence for each mode shape was studied separately. This paper proposes a new methodology based on combined modal wavelet transform strategy to cope with noisy signals, while at the same time, able to extract the relevant information from each mode shape. The proposed methodology will be then compared with the most frequently used and wide-studied methods from the bibliography. To evaluate the performance of each method, their capacity to detect and localize damage will be analyzed in different cases. The comparison will be done by simulating the oscillations of a cantilever steel beam with and without defect as a numerical case. The proposed methodology proved to outperform classical methods in terms of noisy signals.
Key words: Damage assessment / modal analysis / wavelet transform / damage indicator / cantilever beam
© AFM, EDP Sciences 2017
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