In order to improve the accuracy of structural instantaneous frequency identification,the spline-kernel-led Chirplet transform is modified,and the window function parameters are optimized based on the principle of energy concentration.Firstly,the analytical signal and the two-layer frame model are used to verify the accuracy of the instantaneous frequency of the improved spline-kernelled Chirplet transform(ISCT),and secondly,the experimental results show that the improved spline-kernelled Chirplet transform can effectively identify the instan-taneous frequency generated in the actual engineering structure.
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