Determinations of Stress Wave Velocity in a Timber Pole using Wavelet Transform

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Show simple item record Li, Jianchun en_US Samali, Bijan en_US Dackermann, Ulrike en_US Subhani, Saad en_US
dc.contributor.editor Law, S; Cheng, L; Xia, Y; SU, Z en_US 2012-10-12T03:36:30Z 2012-10-12T03:36:30Z 2011 en_US
dc.identifier 2011002713 en_US
dc.identifier.citation Subhani Md. Mahbube et al. 2011, 'Determinations of Stress Wave Velocity in a Timber Pole using Wavelet Transform', , The Hong Kong Polytechnic University, Hong Kong, , pp. 222-231. en_US
dc.identifier.issn 978-962-367-731-8 en_US
dc.identifier.other E1 en_US
dc.description.abstract This paper presents an application of Wavelet Transform (WT) for determination of stress wave velocity for Non-destructive Testing of timber utility poles in service. For surface Non-destructive Testing (NDT), the hammer impact, which produces generally broadband frequency excitation, is used to generate stress wave. Moreover, due to practicality the impact location for field testing of a utility pole is on the side of the pole and 1.5 m above ground level. And the geometry of utility pole could not guarantee non-dispersive longitudinal wave. All of these issues have resulted in lack of accuracy and reliability of results from surface NDT in field testing. In recognition of such problem, this research explores methods to reliably calculate desired wave velocity by isolating wave mode and studying dispersive nature of utility pole. Fast Fourier Transform (FFT) is firstly conducted to determine the suitable frequency from a stress wave data. Then WT is applied on the wave data mentioned to perform time-frequency analysis. Velocity can be determined by time history data of desired frequency from WT results which will be compared with the available analytical solution for longitudinal wave velocity. The results of the investigation showed that wavelet transform analysis can be a reliable signal processing tool for non-destructive testing in terms of velocity determination, which in turn also helps to determine the embedded length of the timber pole. en_US
dc.language English en_US
dc.publisher The Hong Kong Polytechnic University en_US
dc.relation.isbasedon en_US
dc.title Determinations of Stress Wave Velocity in a Timber Pole using Wavelet Transform en_US
dc.parent Proceeding of The 14th Asia Pacific Conferance en_US
dc.journal.volume en_US
dc.journal.number en_US
dc.publocation Hong Kong en_US
dc.identifier.startpage 222 en_US
dc.identifier.endpage 231 en_US FEIT.School of Civil and Environmental Engineering en_US
dc.conference Verified OK en_US
dc.for 090500 en_US
dc.personcode 10982181 en_US
dc.personcode 930859 en_US
dc.personcode 870186 en_US
dc.personcode 995216 en_US
dc.percentage 100 en_US Civil Engineering en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom Dynamics for Sustainable Engineering en_US 20111205 en_US
dc.location.activity Hong Kong en_US
dc.description.keywords non-destructive testing, timber pole, stress wave, wavelet transform en_US
dc.staffid en_US
dc.staffid 995216 en_US

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