A Reference Matching-Based Temperature Compensation Method for Ultrasonic Guided Wave Signals

Abstract

The ultrasonic guided wave-based structural damage diagnosis method has broad application prospects in different fields. However, some environmental factors such as temperature and loads will significantly affect the monitoring results. In this paper, a reference matching-based temperature compensation for ultrasonic guided wave signals is proposed to eliminate the effect of temperature. Firstly, the guided wave signals measured at different temperatures are used as reference signals to establish the relationship between the features of the reference signals and temperature. Then the matching algorithm based on Gabor function is used to establish the relationship between the amplitude influence coefficient obtained by the reference signal and the corresponding temperature. Finally, through these two relationships, the values of the phase and amplitude influence coefficients of the guided wave signals at other temperatures are obtained in a way of interpolation in order to reconstruct the compensation signals at the temperature. The effect of temperature on the amplitude and phase of the guided wave signal is eliminated. The proposed temperature compensation method is featured such that the compensation performance can be improved by multiple iteration compensation of the residual signal. The ultrasonic guided wave test results at different temperatures show that the first iterative compensation of the proposed method can achieve compensation within the temperature range greater than 7 °C, and the compensation within the temperature range greater than 18 °C can be achieved after three iterations.

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

“…The compensation process of the proposed temperature compensation method and its experimental results are illustrated in the literature [33]. Generally, above the temperature can be replaced by other environmental factors such as load and humidity.…”

“…To help the reader understand the proposed compensation methods, this section introduces a basic process of the reference matching-based temperature compensation method [33]. The proposed method is mainly based on the matching pursuit algorithm of Gabor function, which is an open architecture framework that can be expanded according to different compensation scenarios of a single environmental factor (e.g., load and humidity).…”

“…The scatter signal is obtained by subtracting the reconstructed signal from the current signal. Then the diagnostic imaging algorithm based on probabilityweighted distribution [33] is used to obtain the damage diagnosis image as shown in Figure 16 (d), (e), (f) and Figure 16 (a), (b), (c) are the results of damage diagnosis imaging obtained by directly comparing the signals obtained in the coupling condition group 5 with the reference signals.…”

“…In 2019, Wang et al [33] developed a matching algorithm based on Gabor function to establish the relationship between the amplitude influence Coefficient obtained by the reference signal and the corresponding temperature. The proposed temperature compensation method can be further improved by multiple iteration compensation of the residual signal.…”

“…However, little work focus on how to simultaneously compensate the coupled effect of varied ambient temperature and load on guided wave signals, which can be encountered in real operation of modern flight vehicles. Based on the authors' previous work [33], this paper develops an improved matching pursuit-based temperature and load compensation method for ultrasonic guided wave signals.…”