| 周进节,郑阳,张宗健,谭继东.基于空间拓展法的管道高阶螺旋导波波包追踪方法研究[J].声学技术,2018,37(5):435~441 |
| 基于空间拓展法的管道高阶螺旋导波波包追踪方法研究 |
| Pipe helical guided wave packet tracking with space duplication method |
| 投稿时间：2018-03-14 修订日期：2018-05-28 |
| DOI：10.16300/j.cnki.1000-3630.2018.05.006 |
| 中文关键词: 超声导波 螺旋导波 波包追踪 电磁超声换能器 兰姆波 无损检测 |
| 英文关键词: ultrasonic guided wave helical guided wave wave package tracing electromagnetic acoustic transducer Lamb wave non-destructive testing |
| 基金项目:NQI重点专项（2016YFF0203003）、质检公益性行业科研专项（201410026）、国家自然科学基金（61601413）资助。 |
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| 中文摘要: |
| 螺旋导波是管道短距离高精度层析成像技术采用的主要导波模态，可以有效地提高成像分辨率，弥补目前管道导波长距离大范围检测精度低的缺点，在管道腐蚀检测中具有重要意义。然而由于导波的频散及螺旋导波的多路径传播特性，换能器接收到的检测信号波包众多，且经常发生重叠。为了便于分析这些波包的来源，需要有效的方法来计算各阶螺旋传播路径的长度及波包到达时间，进行波包追踪。推导了基于空间拓展法的管道高阶螺旋导波传播路径的计算模型，并针对各向均匀辐射的柱面波前兰姆波形成的管道螺旋导波，进行了数值计算和实验验证，证明了模型的正确性及其在波包追踪中的有效性。对利用管道螺旋导波进行检测及层析成像具有理论指导作用。 |
| 英文摘要: |
| Helical guided wave is the main guided wave mode used in short distance and high precision tomography technique of the pipeline. It can effectively improve the imaging resolution and make up for the shortcoming of the low inspection accuracy in long-range pipeline guided wave testing. This is of great significance in pipeline corrosion inspection and evaluation. However, due to the dispersion of guided wave and the multipath propagation of helical guided wave, the transducer usually receives a large number of wave packets and they often overlap each other. In order to analyze the source of these wave packets, an effective method is needed to calculate the length of each helical path and the arrival time of each wave packet, and to track the wave packet. In this paper, a calculation model of high-order helical guided wave propagation path based on spatial duplication method is proposed. The helical guided waves formed by circular wavefront Lamb waves with uniform radiation in every direction are studied. The numerical calculation and experimental verification are carried out. The correctness of the model and its effectiveness in wave packet tracking are proved. This paper is useful for pipeline tomography of helical guided waves. |
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