Longitudinal Guided Wave Inspection of Small-Diameter Elbowed Steel Tubes with a Novel Squirrel-Cage Magnetostrictive Sensor
In the study, ultrasonic longitudinal mode guided waves were employed to detect defects in elbowed tubes (without welds) with a diameter of 10 mm. Finite element simulation results highlighted that the emitted L(0,1) mode guided waves experienced strong reflection and mode conversion at the elbow re...
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Online Access: | http://dx.doi.org/10.1155/2019/3027372 |
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doaj-4267a38a2b034421b2f4af639dc1aab92020-11-25T01:13:29ZengHindawi LimitedJournal of Sensors1687-725X1687-72682019-01-01201910.1155/2019/30273723027372Longitudinal Guided Wave Inspection of Small-Diameter Elbowed Steel Tubes with a Novel Squirrel-Cage Magnetostrictive SensorYao Liu0Xiucheng Liu1Chehua Yang2Wenxin Guo3Bin Wu4Cunfu He5College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing, ChinaCollege of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing, ChinaGraduate Institute of Manufacture Technology, National Taipei University of Technology, Taipei, ChinaBeijing Pansmart Pipeline Technology Co., Ltd, Beijing, ChinaCollege of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing, ChinaCollege of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing, ChinaIn the study, ultrasonic longitudinal mode guided waves were employed to detect defects in elbowed tubes (without welds) with a diameter of 10 mm. Finite element simulation results highlighted that the emitted L(0,1) mode guided waves experienced strong reflection and mode conversion at the elbow region to generate F(1,1) mode, followed by slow and weak F(2,1) mode. The guided wave reflected from the elbow with a through-wall defect was manifested as two overlapped wave packets, which were good indicators of a defective elbow. To conduct L(0,1) mode guided waves inspection on the small-diameter elbowed tubes, a novel tailored squirrel-cage magnetostrictive sensor was employed in the experiment. The new sensor employed the configuration of segmental iron-cobalt strips and small-size permanent magnet arrays. The entire sensor is composed of two identical C-shaped sensor elements and can be recycled and installed conveniently. Experimental results obtained from healthy and defective tubes were consistent with the conclusions obtained from finite element simulations. An artificial through-wall defect at the elbow and a notch defect at the straight part of the tube could be simultaneously detected by L(0,1) mode guided waves through comparing experimental signals with simulation results.http://dx.doi.org/10.1155/2019/3027372 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yao Liu Xiucheng Liu Chehua Yang Wenxin Guo Bin Wu Cunfu He |
spellingShingle |
Yao Liu Xiucheng Liu Chehua Yang Wenxin Guo Bin Wu Cunfu He Longitudinal Guided Wave Inspection of Small-Diameter Elbowed Steel Tubes with a Novel Squirrel-Cage Magnetostrictive Sensor Journal of Sensors |
author_facet |
Yao Liu Xiucheng Liu Chehua Yang Wenxin Guo Bin Wu Cunfu He |
author_sort |
Yao Liu |
title |
Longitudinal Guided Wave Inspection of Small-Diameter Elbowed Steel Tubes with a Novel Squirrel-Cage Magnetostrictive Sensor |
title_short |
Longitudinal Guided Wave Inspection of Small-Diameter Elbowed Steel Tubes with a Novel Squirrel-Cage Magnetostrictive Sensor |
title_full |
Longitudinal Guided Wave Inspection of Small-Diameter Elbowed Steel Tubes with a Novel Squirrel-Cage Magnetostrictive Sensor |
title_fullStr |
Longitudinal Guided Wave Inspection of Small-Diameter Elbowed Steel Tubes with a Novel Squirrel-Cage Magnetostrictive Sensor |
title_full_unstemmed |
Longitudinal Guided Wave Inspection of Small-Diameter Elbowed Steel Tubes with a Novel Squirrel-Cage Magnetostrictive Sensor |
title_sort |
longitudinal guided wave inspection of small-diameter elbowed steel tubes with a novel squirrel-cage magnetostrictive sensor |
publisher |
Hindawi Limited |
series |
Journal of Sensors |
issn |
1687-725X 1687-7268 |
publishDate |
2019-01-01 |
description |
In the study, ultrasonic longitudinal mode guided waves were employed to detect defects in elbowed tubes (without welds) with a diameter of 10 mm. Finite element simulation results highlighted that the emitted L(0,1) mode guided waves experienced strong reflection and mode conversion at the elbow region to generate F(1,1) mode, followed by slow and weak F(2,1) mode. The guided wave reflected from the elbow with a through-wall defect was manifested as two overlapped wave packets, which were good indicators of a defective elbow. To conduct L(0,1) mode guided waves inspection on the small-diameter elbowed tubes, a novel tailored squirrel-cage magnetostrictive sensor was employed in the experiment. The new sensor employed the configuration of segmental iron-cobalt strips and small-size permanent magnet arrays. The entire sensor is composed of two identical C-shaped sensor elements and can be recycled and installed conveniently. Experimental results obtained from healthy and defective tubes were consistent with the conclusions obtained from finite element simulations. An artificial through-wall defect at the elbow and a notch defect at the straight part of the tube could be simultaneously detected by L(0,1) mode guided waves through comparing experimental signals with simulation results. |
url |
http://dx.doi.org/10.1155/2019/3027372 |
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