彭国平, 张在东, 卢超, 李秋锋. 焊缝声发射源二维时间反转成像定位方法研究[J]. 南昌航空大学学报(自然科学版), 2017, 31(3): 90-94. DOI: 10.3969/j.issn.1001-4926.2017.03.015
引用本文: 彭国平, 张在东, 卢超, 李秋锋. 焊缝声发射源二维时间反转成像定位方法研究[J]. 南昌航空大学学报(自然科学版), 2017, 31(3): 90-94. DOI: 10.3969/j.issn.1001-4926.2017.03.015
PENG Guo-ping, ZHANG Zai-dong, LU Chao, LI Qiu-feng. Study on 2D Location Imaging Method of Acoustic Emission Source Based on Time Reversal for Weld Seam[J]. Journal of nanchang hangkong university(Natural science edition), 2017, 31(3): 90-94. DOI: 10.3969/j.issn.1001-4926.2017.03.015
Citation: PENG Guo-ping, ZHANG Zai-dong, LU Chao, LI Qiu-feng. Study on 2D Location Imaging Method of Acoustic Emission Source Based on Time Reversal for Weld Seam[J]. Journal of nanchang hangkong university(Natural science edition), 2017, 31(3): 90-94. DOI: 10.3969/j.issn.1001-4926.2017.03.015

焊缝声发射源二维时间反转成像定位方法研究

Study on 2D Location Imaging Method of Acoustic Emission Source Based on Time Reversal for Weld Seam

  • 摘要: 焊缝检测一直是工业无损检测的一个重点检测对象,但是目前还没有一种可靠准确的动态检测方法,而应用声发射检测技术实现焊缝动态监测的一个重要方面就是声源定位问题。本文提出采用时间反转成像理论进行声发射源定位,主要对两种成像方法处理结果进行探讨。根据声发射检测特点,结合时间反转聚焦理论,推导了损伤声源信号时间反转过程,有效提高了信号的信噪比;根据四点圆弧成像方法,理论分析了两种成像方式的特点;最后通过数值仿真验证定位方法,从仿真实验结果可知,该成像定位算法可准确确定声源位置,同时发现两种成像方式的时反成像图存在一定差异,但经过阈值化处理后,成像结果一致,对定位精度没有影响。

     

    Abstract: Weld seam detection has been a key detection object in industrial nondestructive testing, but there is still no dynamic detection method which is reliable and accurate, the acoustic source localization is an important aspect to achieve dynamic detection for weld seam with acoustic emission (AE). A 2D time reversal imaging method for acoustic source is proposed. According to the characteristics of AE, time reversal process is derived by combining with the time reversal theory, which could effectively improve the SNR; In the light of the four point arc imaging method, the characteristics of the two imaging modes are analyzed; Finally, the localization method is validated through numerical simulation, and the simulation results show that the time reversal imaging method can accurately locate the position of the acoustic source, and the two imaging ways have some difference, but imaging results are consistent and there are no influence on the positioning accuracy after threshold processing.

     

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