Phase characteristic analysis and experimental study on the guidedwave reflected from expressway guardrail posts

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (6) : 223-228.

LIU Weixu1,TANG Zhifeng2,Lü Fuzai3,QIAO Yinhu1,ZHANG Chunyun1

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Abstract

In order to identify automatically the guided wave signal reflected from the end of an expressway guardrail post and further inspect the buried depth of the guardrail post,the phase characteristic of the guided wave at the end of the guardrail post was analyzed and investigated.It is concluded that the echo signal from the end face has the characteristic of reverse-phase with the excitation pulse signal through deducing and calculating the reflection coefficient.The simulation signals obtained by the finite element simulation software of ABAQUS and the measured signals of the guided wave were decomposed sparsely by using a matching pursuit algorithm based on Gabor dictionary respectively,then the phase characteristic of the echo signals were verified by the phase parameters of matching atoms.The measured signals were collected by detecting identify buried and free guardrail posts using T (0,1) mode guided wave with the frequency of 64 kHz and 128 kHz,respectively.The experimental results of the simulated and measured signals are in good agreement with those of the theoretical analysis.The phase characteristic analysis of the echo signal provides a new way to the signal processing in guided wave detections.

Key words

ultrasonic guided-wave technology / phase characteristic / matching pursuit / guardrail post / signal extraction

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LIU Weixu1,TANG Zhifeng2,Lü Fuzai3,QIAO Yinhu1,ZHANG Chunyun1. Phase characteristic analysis and experimental study on the guidedwave reflected from expressway guardrail posts[J]. Journal of Vibration and Shock, 2017, 36(6): 223-228

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