Second-order directional cyclostationary based method for analysis of instable journal bearing signal

LUO Honglin,LIU Xiaofeng,BO Lin

Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (4) : 49-55.

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PDF(2476 KB)
Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (4) : 49-55.

Second-order directional cyclostationary based method for analysis of instable journal bearing signal

  • LUO Honglin,LIU Xiaofeng,BO Lin
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Abstract

The second-order directional cyclostationary is defined based on the second-order cyclic statistics.This method extend the second-order cyclic statistics which is restricted to analyze the real-valued signal to process the constructed complex-valued signal obtained from the journal bearing supported rotor system operating with oil film instability by defining Directional cyclic autocorrelation(DCR) and Directional cyclic spectral correlation density(DSCD).To verify this method, the rotation test bench was used to simulate rotating machinery fault.The analysis of the experimental data showed that the periodic vibration characteristics and rotation direction within the plane of interest can be easily discovered. Besides the slice of DSCD at the  specified frequency can show more frequency coupling information of rotor,which verified the effectiveness of the method.
 

Key words

 journal bearing / oil-film instability;directional cyclic autocorrelation;Directional cyclic spectral autocorrelation density function

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LUO Honglin,LIU Xiaofeng,BO Lin. Second-order directional cyclostationary based method for analysis of instable journal bearing signal[J]. Journal of Vibration and Shock, 2016, 35(4): 49-55

References

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