Diagnosis method for single fault of aerospace bearings

Roundness, roughness and bad channel shape of bearing ring are important factors which influence the friction torque of sensitive bearings. In this paper, as for gyroscope framework sensitive bearings, the dynamic friction torque of bearing with four defects is analyzed, the four defects include outer ring in bad gully shape, inner circle in bad gully shape, inner ring in bad roundness and inner ring in bad roughness. Fourier transform, wavelet analysis and mathematical statistics are used. And some parameter indexes are also calculated .