Beam damage detection base on coherence function of random vibration response#br#

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (11) : 146-150.

Zhang Yufei1, Wang Shanshan1, Gan shuilai2

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Abstract

A structural damage detection method based on the coherence function of random vibration is presented in this study, and is based on the principle that the nonlinear severity effect between the local and entire structure will increase if the local structure suffers a loss of stiffness due to damage. Furthermore, a modified local damage factor (MLDF) method is proposed. This method is capable of determining the presence, severity, and location of structural damage at the same time. By including the dynamic characteristics of the intact local structure in this method, the influence of structural nonlinearity, imperfections, and system noise is considered, so that the accuracy of damage detection is improved. As a demonstration, the experiment of a cantilever beam with different magnitudes of local damage is conducted to validate the concept. The experimental results indicate that the method can be used to detect the single-crack and multiple-cracks of cantilever beam accurately and reliably.

Key words

cantilever beam；damage detection ; / coherence function；random vibration； nonlinearity

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Zhang Yufei1, Wang Shanshan1, Gan shuilai2. Beam damage detection base on coherence function of random vibration response#br#[J]. Journal of Vibration and Shock, 2016, 35(11): 146-150

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