基于缓冲波导的T(0,1)模态导波激励方法实验研究
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摘要
缓冲波导是解决超声传感器在高温管道在线检测中失效问题的重要途径。针对已提出的通过在缓冲波导内产生S0模态的Lamb波,并利用缓冲波导与管道的连接耦合,间接激励出T(0,1)模态导波的方法,本文进行了实验研究,设计并研制了用于激励S0模态Lamb波的曲折型线圈电磁超声换能器和用于接收T(0,1)模态导波的周期性永磁铁阵列式电磁超声换能器。结果表明:S0模态的Lamb波通过缓冲波导后能够激励出T(0,1)模态的导波对管道进行检测,从而验证了该方法的有效性,并为该方法的工程应用奠定了基础。
This paper presents an experimental study of the T(0,1)mode guided wave excitation method for a buffer waveguide wrapped around a pipe which has been proposed to overcome the main challenge in online inspection of high-temperature pipelines.The dispersion curve was analyzed in tests to show that the T(0,1)mode guided wave can be excited in the pipe by exciting the S0 mode Lamb wave in the buffer waveguide with a meander-line coil EMAT to generate the S0-wave and a PPM EMAT to detect the T(0,1)-wave.Tests indicate that the T(0,1)-wave can be converted from the S0-wave by the buffer waveguide,which verifies the validity of this method as a foundation for engineering applications.
This paper presents an experimental study of the T(0,1)mode guided wave excitation method for a buffer waveguide wrapped around a pipe which has been proposed to overcome the main challenge in online inspection of high-temperature pipelines.The dispersion curve was analyzed in tests to show that the T(0,1)mode guided wave can be excited in the pipe by exciting the S0 mode Lamb wave in the buffer waveguide with a meander-line coil EMAT to generate the S0-wave and a PPM EMAT to detect the T(0,1)-wave.Tests indicate that the T(0,1)-wave can be converted from the S0-wave by the buffer waveguide,which verifies the validity of this method as a foundation for engineering applications.
引文
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[2]LIU Z H,HU Y A,FAN J W,et al.Longitudinal mode magnetostrictive patch transducer array employing a multi-splitting meander coil for pipe inspection[J].NDT&E International,2016,79:30-37.
[3]XU J,WU X J,KONG D Y,et al.A guided wave sensor based on the inverse magnetostrictive effect for distinguishing symmetric from asymmetric features in pipes[J].Sensors,2015,15(3):5151-5162.
[4]何存富,胡跃刚,焦敬品,等.低阶扭转模态电磁声阵列传感器研制及其在厚壁小径管中的试验研究[J].机械工程学报,2015,51(2):14-20.HE C F,HU Y G,JIAO J P,et al.Array of fundamental torsional mode EMATs and experiment in thick-wall pipe with small diameter[J].Journal of Mechanical Engineering,2015,51(2):14-20.(in Chinese)
[5]黄焕东.高温压力管道检测技术研究[C]//压力管道技术研究进展精选集——第四届全国管道技术学术会议.黄山,中国:化学工业出版社,2010:406-408.HUANG H D.Research on the inspection technology of high-temperature pressure pipeline[C]//Pressure Piping Technology Progress Collection—Fourth National Pipeline Technology Conference.Huangshan,China:Chemical Industry Press,2010:406-408.(in Chinese)
[6]DHUTTI A,TUMIN S A,MOHIMI A,et al.Development of low frequency high temperature ultrasonic transducers for in-service monitoring of pipework in power plants[J].Procedia Engineering,2016,168:983-986.
[7]HERNANDEZ-VALLE F,DIXON S.Preliminary tests to design an EMAT with pulsed electromagnet for high temperature[C]//AIP Conference Proceedings.Chicago,Illinois:AIP,2009,1096(1):936-941.
[8]HERNANDEZ-VALLE F,DIXON S.Initial tests for designing a high temperature EMAT with pulsed electromagnet[J].NDT&E International,2010,43(2):171-175.
[9]MURAYAMA R,MATSUMOTO K,USHITANI K,et al.Pipe inspection system by guide wave using a long distance waveguide[J].Modern Mechanical Engineering,2015,5(4):139-149.
[10]丁辉.计算超声学:声场分析及应用[M].北京:科学出版社,2010.Ding H.Computational ultrasonics-analysis and application of ultrasonic field[M].Beijing:Science Press,2010.(in Chinese)