According to the characteristics of frequent fault and difficult diagnosis of rotating parts,selecting more interrelated vibration parameters as original character vectors,how to collect the characters from fault database and analyze rotating parts running conditions by applying fuzzy clustering way is demonstrated in this paper.

The echo signals of moving targets with rotating parts are analyzed in this paper;then according to their charac- teristics,a matching decomposition algorithm with a dictionary of two types of atoms,i.

Based on radar back scattering,unitary model of radar returns from aircraft rotating parts,such as the propellers of propeller-driven aircrafts and the rotors of helicopters are derived in detail,and the specifications of parameters in model are normalized.