RESEARCH ON EFFECT OF EMD AND BINARY QUADRATURE WAVELET DECOMPOSITION UPON THE SIGNAL PROCESSING RESULT OF VIBRATION SIGNAL IN ROTATING MACHINERY
WU Dong-min · 2007
The processing effects of EMD and binary quadrature wavelet decomposition are analyzed and contrasted with the vibration signals from the faulty rolling bearing.The analytical result indicates that the vibration signal in rotating machinery behaves in the form of amplitude modulation,and the frequencies of carrler wave and modulation wave are usually different from each other.The method of EMD can self-adaptively decompose signal in the form of dyadic frequency components based on authentic physical meaning of signal,therefore the decomposed result can reserve signal of amplitude modulation character completely.The decomposition by binary quadrature wavelet has perfect theoretical foundation,but it only can decompose signal based on mathematical meaning.The integrality of signal of amplitude modulation is destroyed usually,therefore,the faulty location can not be positioned correctly.The processing effect of EMD is generally better than that of binary quadrature wavelet transformation.