Fault Diagnosis for Crankshaft Bearing in Diesel Engine Based on Bispectrum Analysis

Aimed at the problem of the feature of nonstationary vibration signal can not be extracted easily; the bispectrum analysis technique was researched in this paper. Bispectral characteristic frequency faces were searched along the parallel to the diagonal line at certain step in the bispectral modulus field and the mean magnitude was calculated to get the feature parameters. The method was applied in fault feature extraction of crankshaft bearing in diesel engine successfully.