管道通透型缺陷的超声导波检测有限元仿真  

Finite Element Simulation of Ultrasonic Guided Wave to Detect Through-type Defects in Pipe

作　　者：胡宏伟[1,2] 王泽湘[1] 孙广开[2] 彭刚[1] 

机构地区：[1]长沙理工大学汽车与机械工程学院,长沙410114 [2]北京航空航天大学机械工程与自动化学院,北京100191

出　　处：《系统仿真学报》2016年第11期2777-2783,共7页Journal of System Simulation

基　　金：国家自然科学基金(51205031);湖南省自然科学基金(2015JJ4004);湖南省高校创新平台开放基金(14K003)

摘　　要：为获取管道缺陷与超声导波的作用规律,研究了导波在管道传播的频散特性,建立了含通透型缺陷的管道有限元模型,以不同尺寸的轴向缺陷和周向缺陷为对象,采用控制变量法,通过有限元仿真研究了缺陷位置、尺寸与超声导波反射系数的关系。结果表明采用L(0,2)和T(0,1)模态导波检测时,缺陷的周向大小与反射系数存在线性关系,通过缺陷回波位置和回波幅值能分别确定缺陷的轴向位置及周向大小,为管道导波检测的缺陷定量与定位提供了有益参考。To get the relationship between the defects and ultrasonic guided wave, the dispersion characteristic of guided wave in pipe was studied. Then the finite element model of a pipe with a through-type defect was established. Taking the axial and circumferential defects with different sizes as research objects, the relationship between the defect location and defect size with the ultrasonic guided wave reflection coefficients was studied, using a control variable method, by finite element simulation. The results show that there is a linear relationship between the circumferential sizes of the defect and the reflection coefficients for through-type defects when the L （0,2） and T （0,1） guided wave are used, and the axial position and circumferential size of the detect can be detected respectively by the defect echo position and amplitude values. The study provides a reference for sizing and locating of detects in pipe.

关 键 词：导波检测 通透型缺陷 有限元仿真 频散特性 

分 类 号：TB551[理学—物理]