A new cepstral analysis procedure of recovering excitations for transient components of vibration signals and applications to rotating machinery condition monitoring

A new cepstral analysis procedure with the complex cepstrum for recovering excitations causing multiple transient signal components from vibration sig nals, especially from rotor vibration signals, has been developed. Along wi th the problem of singularity, a major problem of the cepstrum is that it c annot provide a correct distribution of the excitations. To solve these pro blems, a signal preprocessing method whose function is to provide a definit ion for the distribution of the excitations along the quefrency axis and re move singular points from the transform, has been added to the cepstrum ana lysis. With this procedure, a correct distribution of the excitations can b e obtained. An example of application to the condition monitoring of rotor machinery is also presented.