Visualization and modal analysis of guided waves from a defect in a pipe

Salim, Muhammad Nor; Hayashi, Takahiro; Murase, Morimasa et al.

Japanese Journal of Applied Physics, 2009, 48(7S), 07GD06

Number of Access:373（2025-11-13 08:37 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/84558

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Title
Visualization and modal analysis of guided waves from a defect in a pipe
Creator
CreatorName
Salim, Muhammad Nor
NRID
1000030324479 1000030324479
ORCID
0000-0001-6064-4658 0000-0001-6064-4658
researchmap permalink
takahiro_hayashi takahiro_hayashi
Scopus Author ID
37064150200 37064150200
CreatorName
Hayashi, Takahiro
CreatorName
Murase, Morimasa
NRID
1000000204628 1000000204628
CreatorName
Kamiya, Shoji
Description
Salim M., Hayashi T., Murase M., et al. Visualization and modal analysis of guided waves from a defect in a pipe. Japanese Journal of Applied Physics, 48(7S), 07GD06 (2009) https://doi.org/10.1143/JJAP.48.07GD06.
Abstract
Many commercial guided wave pipe inspection techniques use an axisymmetric torsional mode T(0, 1) as well as a longitudinally vibrating L(0, 2) mode as incident waves since the torsional mode has prominent characteristics of low attenuation and nondispersion. However, reflected waves from defects in a pipe contain many modes other than the incident torsional mode, and the complex reflected wave propagation sometimes prevents us from locating defects in the field. Therefore, we carried out a visualization of guided wave propagations around the full circumference of pipes to explain the behavior of reflected waves from defects that occur in pipe inspections. In this study, a large number of RF signal measurements at many locations on the curved surfaces of pipes were performed using a laser Doppler vibrometer (LDV) and a 6-axis robot arm that scanned over the curved surfaces of two pipes with circumferential and oblique defects. The visualizations of guided wave propagations from defects are shown for both in- and out-of-plane vibrations to analyze the mode conversions that occur in pipes around these defects when using the axisymmetric torsional mode T(0, 1) as an incident wave in pipe inspections. © 2009 The Japan Society of Applied Physics.
Publisher
The Japan Society of Applied Physics
Source Title
Japanese Journal of Applied Physics
Volume (Issue)
48(7S)
Page
07GD06
Date of Issued
2009-07-21
Language
English
Handle URL
https://hdl.handle.net/11094/84558
PISSN
00214922
eISSN
13474065
NCID
AA12295836
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1143/JJAP.48.07GD06
Access Rights
open access
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article