Noise Reduction of Harmonic Drive Reducer Vibration Based on Wavelet Theory

The wavelet theory is applied to the vibration signals of XB-80-134H harmonic drive reducer. The noise is cut with the method of Daubechies wavelet analysis and threshold denoise method. Corresponding to the threshold of every wavelet level, set the coefficients that are below to the threshold to zero, the denoised signals were given with the rest wavelet coefficients reconstructed. Comparing with FFT(Fast Fourier Transform ) denoise method, the effects of wavelet method is better than FFT methods.