闭合型裂纹时间反转损伤识别

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (9) : 95-101.

论文

闭合型裂纹时间反转损伤识别

张望，吴维亮，肖黎，屈文忠

作者信息 +

Time reversal based damage detection for closed crack

Wang ZHANG, Weiliang WU, Li XIAO, Wenzhong QU

Author information +

文章历史 +

摘要

由于超声波能穿透闭合型裂纹界面，采用传统的线性超声技术难以检测和定位闭合型裂纹损伤，本文基于非线性时间反转理论研究了闭合型裂纹损伤检测方法。通过金属铝板上黏贴的压电激励/传感阵列，进行了Lamb波检测螺栓模拟的闭合型裂纹实验。根据Lamb波时间反转原理，得到激励重构信号。通过计算激励信号和重构信号间的相关系数定义了损伤指数,开发了能定位闭合型裂纹的成像算法。实验结果表明非线性超声时间反转方法能够有效地识别非线性的闭合型裂纹。

Abstract

Initial cracks in metallic structures incline to be closed at rest. Such incipient damage generally fails to be detected and located with traditional linear ultrasonic techniques because ultrasonic waves penetrate the contact area of the closed crack. In this paper, an imaging algorithm based on nonlinear ultrasonic time reversal method is proposed to detect closed cracks in aluminum plates. Two surface-bonded piezoelectric transducer arrays are used to generate, receive and re-emitted ultrasonic wave signals. The closed crack is simulated by tightening a bolt on the aluminum plate. By applying large amplitude excitation voltage on the PZT transducers, the closed crack could be opened and closed. The transmitted waves recorded by PZT array contain nonlinear components, the signals are time reversed, emitted back, and the tone burst reconstructions are achieved. The correlation coefficient between the original excitation signal and the reconstructed signal is calculated to define the damage index for individual sensing path, and are used to develop an imaging algorithm to locate the closed crack on the plate. The experimental results demonstrate that incident wave signals and their reconstructed signals can be used to accurately detect and locate closed cracks.

导出引用

张望，吴维亮，肖黎，屈文忠. 闭合型裂纹时间反转损伤识别[J]. 振动与冲击, 2015, 34(9): 95-101

Wang ZHANG, Weiliang WU, Li XIAO, Wenzhong QU. Time reversal based damage detection for closed crack[J]. Journal of Vibration and Shock, 2015, 34(9): 95-101

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