Damaged detection of ancient wood structure based on wavelet packet energy curvature difference

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (7) : 153-159.

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Damaged detection of ancient wood structure based on wavelet packet energy curvature difference

Wang Xin, Hu Wei-bing,MENG Zhao-bo2

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Abstract

Ancient wood structure damage was simulated with the finite element under random incentive based on Xi’an bell tower, the node acceleration response signal on beam was decomposed with wavelet packet, the wavelet packet energy curvature difference index of ancient wood structure was proposed to decide the damaged localization. The results show that the index is more sensitive to ancient wood structural damage and can accurately determine the damage location under no noise, the injury degree is greater, the index is greater. When SNR is bigger or equal to 40db, the index can decide the damage location, it has a certain degree of noise immunity. The function relation between damaged index and extent is obtained to decide the damage extent, and the applicability is verified, so it provides theory basis for damage warning of Xi’an bell tower under environment excitation.

Key words

ancient wood structure / finite element / damaged detection / wavelet packet energy curvature difference

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Wang Xin;Hu Wei-bing;MENG Zhao-bo. Damaged detection of ancient wood structure based on wavelet packet energy curvature difference[J]. Journal of Vibration and Shock, 2014, 33(7): 153-159