Noise reduction method and system for acoustic emission signal of robot

The invention discloses a noise reduction method and system for a robot acoustic emission signal, and the method comprises the steps: collecting the acoustic emission signal generated by a robot body, carrying out the wavelet denoising of the collected acoustic emission signal, selecting a proper wavelet function and threshold value, removing a noise component, extracting an effective signal of the robot body, and carrying out the preliminary reconstruction. Obtaining an acoustic emission signal h1 after preliminary noise reduction; eMD decomposition is carried out on the acoustic emission signal h1, and the signal is decomposed into a plurality of IMF components and a residual component RES; and respectively calculating a correlation coefficient and a variance contribution rate between each IMF component and the original signal, and reconstructing the IMF components to obtain a noise-reduced acoustic emission signal h2. According to the method, noise reduction processing is performed on the extracted acousti