钢板声发射时间反转聚焦增强定位方法

发布时间：2018-04-11 14:34

本文选题：声发射检测 + 钢板　；参考：《仪器仪表学报》2016年08期

【摘要】：声发射检测方法具有实时动态监测优点,应用越来越广泛,但是对声源的定位始终没有更大的突破。在钢板声发射检测中,提出一种基于时间反转理论的声发射源准确定位的方法。由于声发射检测是一种被动检测技术,结合时间反转聚焦理论,推导出对声源信号实现时间反转聚焦增强处理方法,可增强检测信号中声源幅值,提高信噪比;然后根据声源信号到达时间推算出声源聚焦时刻,利用弹性波传播理论对传感器监测区域重建信号传播波动图,显示出声源位置和区域;最后通过实验测试对该方法进行验证,结果表明该方法能有效提高损伤声源信号的能量,对检测区域的信号重建和定位显示准确地给出损伤声源位置。
[Abstract]:Acoustic emission detection method has the advantage of real-time dynamic monitoring and has been widely used, but there has been no breakthrough in sound source location.In acoustic emission detection of steel plate, an accurate localization method of acoustic emission source based on time reversal theory is proposed.Because acoustic emission detection is a passive detection technique, combining with the theory of time reversal focusing, the method of time reversal focusing enhancement for sound source signal is deduced, which can enhance the amplitude of sound source and improve the signal-to-noise ratio.Then according to the arrival time of the sound source signal, the focus time of the sound source is calculated, and the signal propagation wave diagram is reconstructed by the elastic wave propagation theory to show the location and region of the sound source. Finally, the method is verified by the experimental test.The results show that this method can effectively improve the energy of the damaged sound source signal, and accurately give the location of the damaged sound source for the signal reconstruction and location display in the detection area.
【作者单位】：南昌航空大学无损检测技术教育部重点实验室;湖南省特种设备检验检测研究院;
【基金】：国家自然科学基金(11264032) 江西省自然科学基金(20122BAB201024) 国家质检总局科技计划项目(2013zjjz180) 航空科学基金(2014ZD56007) 上海航天科技创新基金(SAST201364) 江西省教育厅科技项目(GJJ14530)资助
【分类号】：TG115.28

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