Structural damage identification based on anslysis of modal strain energy and wavelet transformation

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (1) : 121-126.

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Structural damage identification based on anslysis of modal strain energy and wavelet transformation

YAN Ping1,2; LI Hu-sheng2; GE Ji-ping2; YE Qian-yuan1

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Abstract

Single method for structural multiple different degree damage identification is not sensitive to small defects. The paper presents an approach of structural damage identification based on modal strain energy and wavelet transformation characteristics to denote local signal in time domain or frequency domain and process any details of the signal or function. The structural damage index is given out with the change and distribution of wavelet transform coefficients based on elemental modal strain energy. Through the numerical simulation of a simply supported beam and a cable-stayed bridge model experiment study, the method compared with elemental modal strain energy method can effectively determine the structure multiple different degree damage location and estimate damage degree. The method research laid the foundation for the practical application of engineering

Key words

structural damage identification / cable-stayed bridge / modal strain energy / wavelet transformation / experimental study

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YAN Ping;LI Hu-sheng;GE Ji-ping;YE Qian-yuan. Structural damage identification based on anslysis of modal strain energy and wavelet transformation[J]. Journal of Vibration and Shock, 2012, 31(1): 121-126