Bispectrum and 1(1/2)dimensional spectrum analysis for vibration data of blower

The bispectrum and 1(1/2)dimensional spectrum analysis is introduced, then this method is applied to the fault diagnosis of blower. Through the nonlinear phenomenon of quadratic phase coupling is detected by the bispectrum character, and 1(1/2) dimensional spectrum analysis can extract the fault characters of vibration data of blower. The drawback of the STFT analysis, restrictions of frequency resolution, is overcome by the method. Experimental results show that the proposed method is effective in the fault diagnosis of blower.