中南大学学报（自然科学版）2016，Vol.47Issue(7)：2254-2259,6.DOI:10.11817/j.issn.1672-7207.2016.07.011
薄壁小直径管道导波探伤的传感器布置方案优化
Optimization of guided wave sensors distribution along thin-walled small-diameter pipe
摘要
Abstract
The influence of sensor distribution scheme on the frequency dispersion characteristics, modal conversion and defect localization of guided wave along thin-walled metal pipe was investigated. The procedures were as follows. Firstly, the models of defective and non-defective finite element pipes were built using ANSYS software. Axial displacement was exerted to circumferential nodes in the end of pipe based on the transient dynamic analysis methods, and ultrasonic sensor activating L(0,2) mode was simulated. Then, according to time-history curves of the pulse-echo, characteristic parameters such as echo resolution and reflection coefficient were defined. Secondly, the axial defect location precision, as well as the influence of four sensor distribution schemes on the guided wave dispersion, modal conversion, circumferential localization and reflection coefficient were analyzed. The results show that bending modal and wave dispersion can be inhibited effectively while amplitude of echo signal can be amplified by adding sensors. It is difficult to locate crack defects circumferentially when the number of sensors is less than 4.And the reflection coefficient increases linearly with the increase of the number of sensors.关键词
管道/导波/传感器布置/频散特性/反射系数Key words
pipe/guided wave/sensor distribution/dispersion characteristics/reflection coefficient分类
信息技术与安全科学引用本文复制引用
王伟,游鹏辉,钟万里,谢涛,徐俊,钟力强,肖晓晖..薄壁小直径管道导波探伤的传感器布置方案优化[J].中南大学学报（自然科学版）,2016,47(7):2254-2259,6.基金项目
国家自然科学基金资助项目(51175383)(Project(51175383) supported by the National Natural Science Foundation of China) （51175383）
