Vibration Signal Analysis of Journal Bearing Supported Rotor System by Cyclostationarity

Abstract EN

Cyclostationarity has been widely used as a useful signal processing technique to extract the hidden periodicity of the energy flow of the mechanical vibration signature.

However, the conventionalcyclostationarity is restricted to analyzing the real-valued signal, which is incapable of processing the constructed complex-valued signal obtained from the journal bearing supported rotor system operatingwith oil film instability.

In this work, the directional cyclostationary parameters, such as directional cyclic mean, directional cyclic autocorrelation, and directional spectral correlation density, are defined based onthe principle of directional Wigner distribution.

Practical experiment has demonstrated the effectiveness and superiority of the proposed method in the investigation of the instantaneous planar motion of thejournal bearing supported rotor system.