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中南大学学报(自然科学版)

Journal of Central South University

第45卷    第9期    总第241期    2014年9月

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文章编号:1672-7207(2014)09-3001-07
磁致伸缩扭转导波管道缺陷检测数值模拟和实验研究
朱龙翔,王悦民,孙丰瑞

(海军工程大学 动力工程学院,湖北 武汉,430033)

摘 要: 通过有限元方法对T(0,1)模态导波管道缺陷检测进行数值模拟,使用三维有限元单元建立缺陷管道模型,激励和接收T(0,1)模态导波,对管道模型中的多种缺陷进行检测。制作磁致伸缩扭转导波传感器,在实验中激励出T(0,1)模态导波对含有不同缺陷的管道进行检测。对T(0,1)模态导波反射系数与缺陷尺寸之间的关系进行数值模拟和实验研究。研究结果表明:当频率为29 kHz时,T(0,1)模态导波反射系数随缺陷轴向长度的增加先增大后减少,随着缺陷周向长度近似呈线性增加,随缺陷深度呈曲线增加。

 

关键词: T(0,1)模态导波;磁致伸缩传感器;缺陷检测;数值模拟;反射系数

Numerical simulation and experimental study on detecting defects in pipes using magnetostrictive T(0,1) mode guided wave
ZHU Longxiang, WANG Yuemin, SUN Fengrui

College of Power Engineering, Naval University of Engineering, Wuhan 430033, China

Abstract:Detecting defects in pipes using T(0,1) mode guided wave was numerical simulated using finite element method. Aluminum pipes with different defects were modeled using three-dimensional finite elements, and tested by T(0,1) mode guided wave. The magnetostrictive torsional guided wave sensor was made in experiment. Using this sensor, T(0,1) mode torsional guided wave was excited successfully in aluminum pipe. Aluminum pipes with different defects were detected using T(0,1) mode torsional guided wave in experiment. The relation of the reflection coefficient of T(0,1) mode guided wave for defect in aluminum pipes and the dimensions of defect was studied by numerical simulation and experiment. The result indicates that at the frequency of 29 kHz, the reflection coefficient shows an increasing-decreasing tendency with the axial extent of defect, the reflection coefficient is a roughly linear function of the circumferential extent of defect, and increases monotonically with depth, with increasing slope.

 

Key words: T(0,1) mode guided wave; magnetostrictive sensor; defect detecting; numerical simulation; reflection coefficient

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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