滑动轴承油膜失稳振动的二阶定向循环平稳性分析

定义了二阶定向循环平稳统计量，提出了基于二阶定向循环平稳的信号分析方法。该方法将用于单通道实信号分析的二阶循环统计量扩展到复信号，并定义了正交双通道融合复信号的定向循环自相关、定向循环谱相关密度。为了验证该方法，利用转子试验台模拟滑动轴承旋转机械的油膜失稳故障以获取数据，分析结果表明该方法不仅能够提取系统在某一截面内的周期性振动特征，而且能够揭示转子在指定循环频率处的旋向。此外二阶定向循环谱相关密度在指定频率处的切片能显示更加丰富的转子频率耦合调制信息，试验结果验证了该方法的有效性。  

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

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.