超声导波管道缺陷检测数值模拟.pdf

27 1 河 北 工 业 科 技 Vol. 27, No. 1 2010 1 H ebei Journal of Indust rial Science and Technology Jan. 2010 : 100 1534( 2010) 01001 04 1 1 2 1 1 , , , , ( 1. 河北科技大学信息科学与工程学院, 河北石家庄 05001 ; 2. 中国特种设备检测研究院, 北京 100013) : 介绍了超 导波检测技术的研究意义发展现状导波检测的基本原理和激励频率的确定 应用 ANSYS 有限元分析程序建立管道模型, 删除模型中部部分单元模拟切槽缺陷, 施加端部激励 载荷产生L ( 0, 2) 和T ( 0, 1) 模态导波, 模拟超 导波的传播及遇到缺陷的反射回波情况, 通过对接 收信号的分析, 较为准确地定位了缺陷位置 : 导波; 频散; 缺陷检测; 数值模拟 : TB551 : A Numerical simulation of defect detection in pipes using ultrasonic guided w aves 1 1 2 1 1 SU N Guangkai , JIAO Yang , LI Guanghai , ZHAO Yubo , ZHU Yingkui ( 1. Institute of Information Science and Engineering, H ebei University of Science and Technology, Shijiazhuang H ebei 05001 , China; 2. China Special Equipment Inspection and Research Institute, Beijing 100013, China) Abstract:The importance of studying the ultrasonic guided w ave detection technology, the development situation, the basic theories of defect detection using ult rasonic guided w aves and t he det ermination of exciting frequency were int roduced. T he model of a pipe was built using the ANSYS finite element analysis softw are, and some elements located in the middle of the pipe w ere deleted in order to simulate a notch defect, then the L ( 0, 2) and T ( 0, 1) mode guided w aves were excited by t he loads ex erted on the end of the model. The propagation in w aveguide and reflect ion from a notch defect of ultrasonic guided wave w ere simulated, and the notch defect w as localized accurately through t he analysis of the received signals. Key words: guided wave; disperse; defect detection; numerical simulation ,