期刊文献+

应用聚焦和超声隔离增强导波回波幅值的研究

Study on the Application of Guided Wave Focusing and Ultrasonic Isolation Method
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摘要 针对现有增强导波回波幅值的方法综合应用聚焦法和超声隔离法,一方面解决聚焦过程中多通道装置在实验室与工程应用中不易实现的问题,用单通道设备多次激励,通过数据处理达到激励能量聚焦从而提升回波幅值,另一方面从防止激励能量泄露入手,运用超声隔离法阻止管道中的导波能量外泄。采用有限元仿真手段对比4种情况下的效果。针对2100mm长156mm外径的土载有包覆层的钢制管道,通过有限元仿真与试验获取的数据,利用超声导波聚焦方法对管道上一个缺陷进行了聚焦检测。结果表明,与应用综合法前的缺陷信号相比,应用后的缺陷信号的归一化幅度提高3.5倍,提高了超声导波对管道的检测能力。 Aiming at the disadvantage of existing methods on enhancing the amplitude of ultrasonic guided wave,focusing method and energy isolation method were applied synthetically.On the one hand,the problem that multi-channel device is difficult to implement in laboratory and engineering application during focusing process.Excitation energy was focused which raised echo amplitude by data processing and the multiple excitation with a single channel device.On the other hand,started from avoiding leakage of excitation energy.Ultrasonic isolation method was applied to prevent leakage of guided wave energy.Comparing synthetic method with focusing method by finite element simulation.The possibility of using in practice was verified by experiment.Artificial defect was detected by ultrasonic focusing method on the fusion-bonded epoxy-coated steel pipe of 2100mm long and 156mm outer diameter buried in sand.The data was obtained by finite element simulation and experiment.The result shows that,the normalized amplitude of defect signal was raised by 3.5.The method improves the detectability of guided wave on pipe.
作者 李震 赵钰龙 王少锋 LI Zhen;ZHAO Yu-long;WANG Shao-feng(Institute of Mechanical Engineering,Inner Mongolia University of Science and Technology,Inner Mongolia Baotou014010,China)
出处 《机械设计与制造》 北大核心 2019年第10期106-109,共4页 Machinery Design & Manufacture
基金 国家自然科学基金(51565047) 内蒙古自治区自然科学基金(2015BS0511)
关键词 超声导波 聚焦法 超声隔离 管道检测 土载管道 包覆管道 Ultrasonic Guided Waves Focusing Method Ultrasonic Isolation Pipe Inspection Buried Piping Cover-ed Pipe
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