Beam damage detection base on coherence function of random vibration response#br#
Zhang Yufei1, Wang Shanshan1, Gan shuilai2
1. College of Mechanics and Materials, Hohai University, Nanjing, 210098, P.R. China
2. Shanghai Waigaoqiao Shipbuilding Co., Ltd, Shanghai 200137, P.R. China
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.
张宇飞1，王山山1，甘水来2. 基于随机振动响应相干函数的梁结构损伤检测[J]. 振动与冲击, 2016, 35(11): 146-150.
Zhang Yufei1, Wang Shanshan1, Gan shuilai2. Beam damage detection base on coherence function of random vibration response#br#. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(11): 146-150.
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