突发型声发射信号的传播特性及定位研究  

Research on Propagation Characteristics and Location of Burst Acoustic Emission Signal Traveling Along Pipeline

作　　者：孙立瑛[1,2] 李一博[2] 王伟魁[2] 杜刚[2] 靳世久[2] 

机构地区：[1]天津城市建设学院能源与机械系,天津300384 [2]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《压电与声光》2009年第5期745-748,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金青年基金资助项目(50804034);国家自然科学基金重点资助项目(60534050);天津市高等学校科技发展基金计划项目(2007-1103);天津大学精密测试技术及仪器国家重点实验室开放基金资助项目

摘　　要：针对常规无损检测方法只能对管道静态缺陷进行检测的问题,该文研究了基于声发射的压力管道动态缺陷检测方法。在实验室条件下,对一条长15m、直径100mm的不锈钢管道进行了裂纹检测及定位实验,研究了声发射波通过不同管道特征(如焊缝、法兰、支路、变径)时的衰减情况,以及特殊管道附属结构对缺陷定位的影响。并分别采用定时参数补偿、实测波速补偿和衰减特性补偿等方法对缺陷定位计算结果进行了修正。The conventional NDT methods, such as ultrasonic, flux leakage and eddy current method, could onlydetect static defects on components. To solve the problem, a dynamic defect detection method based on Acoustic Emission （AE） was investigated in this paper A stainless pipe, approximately 15 m in length and ,φ100 mm in diameter was used in crack detection and position experiments. Propagation and attenuation characteristics of AE wave traveling along the pipe and passing different geometry structures of the pipe were measured, and its negative effect on positioning of the defeets was analyzed. Several compensation methods, such as time parameters compensation, measured velocity compensation, and attenuation compensation, were adopted to compensate the calculation results of position of the defects.

关 键 词：声发射 管道检测 裂纹 定位 

分 类 号：TP274.21[自动化与计算机技术—检测技术与自动化装置]