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

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Abstract

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.

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Acknowledgments

This work is supported by the Australian Research Council (ARC) and industry partner Ausgrid, through the ARC Linkage Project (LP110200162). The authors also like to thank Ning Yan, Bahram Jozi and Ulrike Dackermann for their support.

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Authors and Affiliations

  1. School of Engineering, Deakin University, Geelong, VIC, 3216, Australia

    Mahbube Subhani

  2. Centre for Built Infrastructure Research, University of Technology Sydney, Ultimo, NSW, Australia

    Jianchun Li

  3. Institute of Infrastructure Engineering, University of Western Sydney, Kingswood, NSW, Australia

    Bijan Samali

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  1. Mahbube Subhani
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  2. Jianchun Li
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  3. Bijan Samali
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Correspondence to Mahbube Subhani.

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Subhani, M., Li, J. & Samali, B. Separation of longitudinal and flexural wave in a cylindrical structure based on sensor arrangement for non-destructive evaluation. J Civil Struct Health Monit 6, 411–427 (2016). https://doi.org/10.1007/s13349-016-0159-6

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  • DOI: https://doi.org/10.1007/s13349-016-0159-6

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