Application Of Synchroqueezing Wavelet Transform In Bolt Anchorage Detection Signal Analysis

Time-frequency aggregation is an important criterion for evaluating the performance of time-frequency analysis methods, and traditional time-frequency analysis methods do not match the requirements of time-frequency aggregation. Synchroqueezing Wavelet Transform (SWT) method, as a new method proposed recently, can improve the time-frequency aggregation effectively by compressing the Wavelet coefficients in frequency domain. This paper applies the SWT method to extract the time-frequency characteristics of the analog signal and compare the analysis results with that of the traditional methods. The bolt anchorage damage detection signals based on guided wave technology of magnetostrictive effect are analyzed as the measured data to verify the effect of SWT method. The results show that SWT method can accurately describe the frequency composition of signals and obtain a relatively concentrated time-frequency energy distribution, providing a new time-frequency analysis method for bolt anchoring quality NDT (Non Destructive Testing).