Damage Detection of Composite Laminated Structure Using Inner Product Vector under White Noise Excitation

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Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (4) : 127-131.

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Damage Detection of Composite Laminated Structure Using Inner Product Vector under White Noise Excitation

WANG Le, YANG Zhichun, WANG Hui, DANG Xiaojuan, DING Yan

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Abstract

Using the cross correlation function of the vibration responses under white noise excitation, a novel concept of inner product vector (IPV) is introduced. Based on the conception of IPV, a new damage detection method is proposed, and the measuring noise resistant ability of the proposed method is also analyzed theoretically. It is proven that the IPV can be easily formed using the inner product of the time domain vibration responses; the value of IPV is dependent on the mode shapes of the structure and the influence of measuring noise on the damage detection results can be adaptively eliminated in the calculation of IPV. Numerical simulation examples of delamination damage detection for a composite laminated beam demonstrated the effectiveness and the anti-noise ability of the proposed method.

Key words

inner product vector (IPV) / cross correlation function / damage detection / measuring noise / delamination

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WANG Le;YANG Zhichun;WANG Hui;DANG Xiaojuan;DING Yan. Damage Detection of Composite Laminated Structure Using Inner Product Vector under White Noise Excitation[J]. Journal of Vibration and Shock, 2009, 28(4): 127-131