关键词: 非平稳随机振动, 故障诊断, 往复机械

Abstract: In accordance with the unstationary time-varying characteristics of the vibroacoustic signals from reciprocating machinery, several signal processing methoes including accordant phase-locked filtering techniques, AR-short-time-periodograms (AR-STP) and AR-pseudo-wigner-ville-distribution (AR-PWVD) methods are proposed and discussed. Application of these methods to the fault diagnosis of 190 diesel engines proved their effectiveness and practicality. Good agreements are achieved among the analytical results obtained with different methods mentioned above. It infers that these methods are conforming to the working mechanism and fault features of reciprocating machines, and hence are effective research approaches for their vibroacoustic analysis and fault diagnosis.

Key words: Fault diagnosis, Reciprocating machinery, Unstationary random vibration