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Ship propeller beats have obvious amplitude modulation to the cavitation noise of its radiation. The DEMON (Detection of Envelope Modulation on Noise) spectrum analysis technology is to demodulate the high frequency components to get the low frequency modulation components. This paper studied the new method to combine the complementary ensemble empirical mode decomposition (CEEMD) with wavelet threshold to reduce the noise. After verifying the method using both simulated signal and experimental signal, it is concluded that this algorithm has good noise suppression performance and the modulation information extracted out is clearer and more comprehensive.

Ship Radiated Noise Modulation Feature Extraction Based on CEEMD and Wavelet Threshold Noise Reduction