STUDY OF ZOOM VECTOR SPECTRUM ANALYSIS BASED ON COMPLEX MODULATION
Jie Han · Jixie qiangdu · 2008
Associating the merits of the vector spectrum in rotary machine fault diagnosis with the traditional zoom-FFT(zoom fast Fourier transform),the principle of the complex modulation zoom vector spectrum(ZVS) was:two frequency-shiftings,low-pass filtering,sub-sampling at a rate of D,making FFT(fast Fourier transform) and calculating the vector spectrum.It was provided with the characteristics of full information and high resolution and its computation load was less than that of the ordinary vector spectrum with the same resolution.The simulation shows that the complex modulation zoom vector spectrum can be used in rotary machine fault diagnosis and is an efficient tool for the analysis of the multi-sources fusion vector signal with intensive spectrum.