An improved adjacent multi-damage “delay-and-sum” imaging method

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (8) : 67-71.

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An improved adjacent multi-damage “delay-and-sum” imaging method

CAI Jian1; SHI Li-hua2; YUAN Shen-fang1

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Abstract

Adjacent multi-damage imaging is a difficulty in the research of Lamb wave imaging. Based on the traditional “delay-and-sum” method, an improved adjacent multi-damage imaging method is proposed. To avoid or reduce the overlapping between neighboring damage scattered signals, double side excitation is adopted in the method to generate single mode Lamb wave monitoring signals with higher spatial resolution. Meanwhile, according to the energy attenuation in the propagation of Lamb waves, a compensation factor is introduced to reduce the monitoring distinctions of monitoring signals for different locations. Both theoretical analysis and experiment show that the above two improvements can enhance the imaging results of adjacent multi-damage.

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structural health monitoring (SHM) / adjacent multi-damage imaging / Lamb waves / double side excitation / attenuation compensation

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CAI Jian;SHI Li-hua;YUAN Shen-fang. An improved adjacent multi-damage “delay-and-sum” imaging method[J]. Journal of Vibration and Shock, 2011, 30(8): 67-71