Determinations of stress wave velocity in a timber pole using wavelet transform

Mahbube Subhani, Jianchun Li, Bijan Samali, Dackermann Dackermann

Research output: Chapter in Book / Conference PaperConference Paperpeer-review

Abstract

![CDATA[This paper presents an application of Wavelet Transfonn (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.]]
Original languageEnglish
Title of host publicationDynamics for Sustainable Engineering: Proceedings of the 14th Asia-Pacific Vibration Conference, 5-8 December 2011, Hong Kong SAR, China
PublisherHong Kong Polytechnic University
Pages222-231
Number of pages10
ISBN (Print)9789623677318
Publication statusPublished - 2011
EventAsia-Pacific Vibration Conference -
Duration: 5 Dec 2011 → …

Conference

ConferenceAsia-Pacific Vibration Conference
Period5/12/11 → …

Keywords

  • wood poles
  • stress waves
  • wavelets (mathematics)

Fingerprint

Dive into the research topics of 'Determinations of stress wave velocity in a timber pole using wavelet transform'. Together they form a unique fingerprint.

Cite this