A Study on the Application of Wavelet Packet Transform in Low-Strain Pile Integrity Test

HYEONG, JOO KIM and HYEONG, SOO KIM and JOSE, LEO MISSION and PETER, REY DINOY and TAE, WOONG PARK (2018) A Study on the Application of Wavelet Packet Transform in Low-Strain Pile Integrity Test. In: Sixth International Conference on Advances in Civil, Structural and Mechanical Engineering - CSM 2018, 28-29 April, 2018, Zurich, Switzerland.

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Abstract

Nonlinear amplification of velocity signals in lowstrain integrity tests is typically done in order to enhance weak echoes and to superimpose any peak reflections. However, unraveling hidden information within signals obscured by noise may sometimes fail when using the conventional method. Therefore, a pile defect identification system is presented in this study based on nonlinear amplification and wavelet packet transform (WPT). After the conventional nonlinear amplification method is applied, the signals are decomposed by WPT in which the detection of the feature parameters from the presence of any geometric or material defects may easily be identified. To serve as a guide in the interpretation of the various characteristics of peak wave forms that are associated with defects, diagnostic rules are presented in this study. In addition, a parametric study was performed using the finite element method and results have shown that the identification method based on WPT can be a useful tool in identifying major defects within the effective length of the pile compared to signal amplification alone.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: diagnostic rule, pile defects, wavelet packet transform, nonlinear amplification method
Depositing User: Mr. John Steve
Date Deposited: 08 Mar 2019 14:51
Last Modified: 08 Mar 2019 14:51
URI: http://publications.theired.org/id/eprint/164

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