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Separation of longitudinal and flexural wave in a cylindrical structure based on sensor arrangement for non-destructive evaluation

Subhani, Mahbube, Li, Jianchun and Samali, Bijan 2016, Separation of longitudinal and flexural wave in a cylindrical structure based on sensor arrangement for non-destructive evaluation, Journal of civil structural health monitoring, vol. 6, no. 3, pp. 411-427, doi: 10.1007/s13349-016-0159-6.

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Title Separation of longitudinal and flexural wave in a cylindrical structure based on sensor arrangement for non-destructive evaluation
Author(s) Subhani, MahbubeORCID iD for Subhani, Mahbube orcid.org/0000-0001-9565-3271
Li, Jianchun
Samali, Bijan
Journal name Journal of civil structural health monitoring
Volume number 6
Issue number 3
Start page 411
End page 427
Total pages 17
Publisher Springer
Place of publication Berlin, Germany
Publication date 2016-07
ISSN 2190-5452
2190-5479
Keyword(s) cylindrical structures
separation of waves
longitudinal wave
bending/flexural wave
wavelet transform
guided wave propogation
non-destructive testing
Summary Low strain integrity testing is commonly used to assess the in situ condition of the poles or piles. For poles, it is important to calculate the embedment length and location of damage which is highly influenced by the accurate determination of the wave velocity. In general, depending on impact location and orientation, both longitudinal and bending waves may generate inside the pole, and these two waves have very distinct characteristics and wave velocity. These differences are even more prominent in the low frequency which is usually induced in the low strain non-destructive testing. Consequently, it will be useful if these two waves can be separated for the condition assessment of the poles. In this paper, a numerical analysis is performed on a pole considering that both waves are generated, and a method is proposed to differentiate these two waves based on an appropriate sensor arrangement that includes the location and the orientation of the sensors. Continuous wavelet transform is applied on the numerical signal to calculate the phase velocity of the waves and compared with analytical phase velocity curves. From the results, it can be seen that appropriate location and orientation of the sensors can separate the longitudinal and flexural waves as they match significantly well with the corresponding analytical phase velocity curves of these two waves.
Language eng
DOI 10.1007/s13349-016-0159-6
Field of Research 090506 Structural Engineering
Socio Economic Objective 870201 Civil Construction Design
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Springer-Verlag
Persistent URL http://hdl.handle.net/10536/DRO/DU:30083318

Document type: Journal Article
Collection: School of Engineering
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