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Application of Ultrasonic Guided Waves for Inspection of High Density Polyethylene Pipe Systems

机译：超声波导波在高密度聚乙烯管道系统检测中的应用

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摘要

The structural integrity assessment of thermoplastic pipes has become an interesting area of research due to its elevated usage in the liquid/gas transportation industry. Ultrasonic guided wave testing has gained higher attention from industry for the inspection of elongated structures due to the reduced inspection time and cost associated with conventional non-destructive testing techniques, e.g., ultrasonic testing, radiography, and visual inspection. Current research addresses the inspection of thermoplastic pipes using ultrasonic guided waves as a low cost and permanently installed structural health-monitoring tool. Laboratory and numerical investigations were conducted to study the potential of using ultrasonic guided waves to assess the structural health of thermoplastic pipe structures in order to define optimum frequency range for inspection, array design, and length of inspection. In order to achieve a better surface contact, flexible Macro-Fiber Composite transducers were used in this investigation, and the Teletest Focus+ system was used as the pulser/receiver. Optimum frequency range of inspection was at 15−25 kHz due to the level of attenuation at higher frequencies and the larger dead zone at lower frequencies due to the pulse length. A minimum of 14 transducers around the circumference of a 3 inch pipe were required to suppress higher order flexural modes at 16 kHz. According to the studied condition, 1.84 m of inspection coverage could be achieved at a single direction for pulse-echo, which could be improved by using a higher number of transducers for excitation and using pitch-catch configuration.
机译：由于热塑性塑料管在液体/气体运输行业中的使用量较高，因此热塑性塑料管的结构完整性评估已成为一个有趣的研究领域。由于缩短了与常规无损检测技术（例如超声检测，射线照相和目测检查）相关的检查时间和成本，超声导波测试在细长结构的检查中受到了业界的更多关注。当前的研究涉及使用超声波导波作为一种低成本且永久性安装的结构健康监测工具来检查热塑性管道。进行了实验室和数值研究，以研究使用超声波引导来评估热塑性管道结构的结构健康状况的潜力，从而确定检查，阵列设计和检查时间的最佳频率范围。为了获得更好的表面接触，本研究中使用了柔性的Macro-Fiber Composite换能器，并且Teletest Focus +系统用作脉冲发生器/接收器。最佳的检查频率范围是15-25 kHz，这归因于较高频率下的衰减水平以及较低频率下由于脉冲长度而导致的较大死区。在3英寸管道的圆周上至少需要14个传感器才能抑制16 kHz时的高阶弯曲模。根据研究条件，脉冲回波可以在单个方向上实现1.84 m的检查覆盖范围，这可以通过使用更多数量的换能器进行激励并采用音高捕捉配置来改善。

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