• CN:11-2187/TH
  • ISSN:0577-6686

›› 2013, Vol. 49 ›› Issue (12): 17-23.

• 论文 • 上一篇    下一篇

基于虚拟时间反转聚焦的管道超声导波检测新方法

符浩;吴斌;何存富   

  1. 北京工业大学机械工程与应用电子技术学院
  • 发布日期:2013-06-20

Ultrasonic Guided Wave Pipe Inspection Based on Synthetic Time-reverse Method

FU Hao;WU Bin;HE Cunfu   

  1. College of Mechanical Engineering and Applied Electronic Technology, Beijing University of Technology
  • Published:2013-06-20

摘要: 针对现有时间反转聚焦方法所需的多通道同步激励与接收装置在实验室与工程应用中成本高且难以实现的问题,提出利用单通道设备多次采集足够的信号并通过信号处理等效实现多通道同步激励-接收效果的虚拟时间反转聚焦方法,它是一种新型的超声导波聚焦方法。采用有限元仿真手段对比该方法与现有时间反转聚焦方法的聚焦效果,通过试验验证该方法在实际检测中应用的可能性。针对2 m长114 mm外径的钢制管道,通过有限元仿真与试验获取的数据,利用超声导波虚拟时间反转聚焦方法对管道上一个人工缺陷进行了聚焦检测。结果表明,与聚焦前的缺陷信号相比,聚焦后的缺陷信号的归一化幅度提高6倍,信号波包外形也有明显改善;同时,该方法在不提高对仪器设备要求的情况下,能够有效地将超声导波管道检测缺陷信号的信噪比从0.033 6提高到2.165 6,进而提高了超声导波对小缺陷的检测能力。

关键词: 超声导波, 管道检测, 虚拟时间反转聚焦

Abstract: Synthetic time-reverse method is a new focusing method in ultrasonic guided wave inspection. Aiming at the problem that the multi-channel system required by common Time-reverse Method is very expensive and hard to build, a post- acquire signal process method based on a single-channel system is used to improve the time-reverse method. The effectiveness of the synthetic time-reverse method is proved through numerical simulation and experiment. A steel pipe of 2 m long and 114 mm outer diameter with an artificial defect is inspected in simulation and experiment. According to the result of the simulation and the experiment, using this method, the normalized amplitude of the defect is 6 times increased, and the wave packet of the defect reflection is greatly improved. The signal-noise-ratio is also raised from 0.033 6 to 2.165 6. The detection capability of ultrasonic guided wave can be improved by the method.

Key words: Pipe inspection, Synthetic time-reverse method, Ultrasonic guided wave

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