A Novel Fault Signal Detection Method

Aiming at the fault signal detection in mechanism system, all phase fast Fourier transform (APFFT) method is proposed for fault detection. The method of APFFT has the outstanding characteristics: the very few power leaks, the zero phase error and the fewer side lobes. So it can resist noise and increase the validity of diagnosis results. Finally, the case of bearing diagnosis is given by using the method of APFFT. The simulation results indicate that APFFT method has better character of fault detection. And it is more robust compared to FFT method. Especially, the power leak based on APFFT is fewer and equal to the square of the power leak based on the conventional FFT. So the APFFT method has the better diagnosis ability.