| Citation: | LIU Yan, LI Yuchen, ZHANG He, et al. Sample entropy characteristics of dynamic pressure at outlet of centrifugal compressor based on EWT[J]. Journal of Aerospace Power, 2023, 38（3）：655-664 doi: 10.13224/j.cnki.jasp.20210509
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Taking the dynamic outlet pressure of the 800 kW centrifugal compressor during the period of transition from steady state to surge state as the research object, the empirical wavelet transform combined with sample entropy characteristics was used to analyze the complex characteristics of the system under different working conditions. First, on the basis of analyzing the characteristics of the dynamic pressure waveform of the system, the empirical wavelet transform combined with the Pearson correlation coefficient was used to extract the signal. Second, the relationship between the sample entropy of the extracted signal and the change of the system working state was analyzed to discuss the influence of the decomposition layer of the empirical wavelet and the dimension of the sample entropy on the analysis result. Finally, white noise was added to the original signal to verify the anti-interference performance of the method. The research results showed that when the system entered the surge state from the steady state, the sample entropy of the system outlet dynamic pressure showed an obviously sudden change characteristics, and its value changed from 0 to about 0.7. From the perspective of the selection of system parameters, the change of sample entropy dimension had little effect on the analysis of system characteristics. In addition, this method had better anti-interference performance.
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