研究目的
Investigating the methods for calculating the velocity of laser-induced broadband surface acoustic wave to accurately measure residual stress.
研究成果
The wavelet method can improve the calculation accuracy of the velocity curve by interpolating the original data. After interpolation, the trend of curve is more obvious, and the fitting error is greatly reduced. The wavelet method is independent of each other at each frequency point, which is conducive to the analysis of the change of velocity.
研究不足
The time domain method results in errors when the SAW propagates in the medium and dispersion occurs. The phase method's calculation procedure is complicated, and there is an association between adjacent data points. The wavelet method is prone to generate outliers.
1：Experimental Design and Method Selection:
The study compares three velocity calculation methods of surface acoustic wave: time domain method, phase method, and wavelet method.
2：Sample Selection and Data Sources:
Simulated surface acoustic waves are used to compare the phase method and wavelet method under the conditions of attenuation and dispersion.
3：List of Experimental Equipment and Materials:
Laser-induced broadband surface acoustic wave on a surface of 7075 aluminium alloy.
4：Experimental Procedures and Operational Workflow:
The velocity of SAW is calculated using the three methods, and their performance under different conditions is analyzed.
5：Data Analysis Methods:
The calculation error of the time domain method under dispersion is analyzed, and a recursive method for calculating phase difference is proposed to improve the efficiency of the phase method.
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