An Improved Matching Pursuit-Based Temperature and Load Compensation Method for Ultrasonic Guided Wave Signals

Yishou Wang,Yue Wang,Di Wu,Xinlin Qing,Hu Sun,Geng Wang,Bingrong Miao

doi:10.1109/access.2020.2985748

Abstract

Temperature and load variations significantly affect ultrasonic guided wave propagation and therefore lead to the increasing of diagnostic uncertainty of the guided wave-based structural health monitoring system, which may cause false reports and false positives and limit the practical application of the method. Most of the existing researches focus on guided wave compensation for a single factor. Therefore it's an important challenge that how to compensate for guided waves under the influence of multiple environmental factors. This study firstly analyzes the coupled effect of temperature and load variations on the propagation characteristics of guided waves. It has been found that the two factors variations cause a highly non-linear effect on the change of guided wave signal characteristics. Based on the previous work of temperature compensation methods based on matching pursuit, this paper develops an improved matching pursuit-based temperature and load compensation method for ultrasonic guided wave signals. The developed method is featured with that the compensation performance can be improved by multiple iteration compensation of the residual signal. By improving the selection of the reference signal set, the developed environmental compensation method based on the reference signal matching is used to realize the compensation under the influence of the temperature-load coupling effect, and the experimental results verify the effectiveness of the proposed compensation method and the proposed compensation method proves to be effective under the influence of temperature and load variations.

Highlights

Ultrasonic guided waves for structural health monitoring has the characteristics of long propagation distance, small attenuation, large detection range and are sensitive to damage such as cracks, debonding, and delamination [1]–[6]
Guided waves are sensitive to the changes of environmental and operational conditions (EOC), which may lead to false reports and false positives
As for the third issue, the improved matching pursuit-based temperature and load compensation method is verified by three cases of guided wave signals of different actuator-sensor paths, listed as follows: (1) The first path is parallel to the direction in which the tensile load is applied, namely, their angle is 0◦; (2) The second path is 45◦ from the direction of the load; (3) The third path is perpendicular to the direction in which the load is applied, namely, their angle is 90◦

Summary

Introduction

Ultrasonic guided waves for structural health monitoring has the characteristics of long propagation distance, small attenuation, large detection range and are sensitive to damage such as cracks, debonding, and delamination [1]–[6]. Y. Wang et al.: Improved Matching Pursuit-Based Temperature and Load Compensation Method for Ultrasonic Guided Wave Signals different stages such as take-off, cruise, and reentry.

Results

Conclusion