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主要介绍旋转机械振动信号的相位分析原理及相位分析在状态监测与故障诊断中的应用方法，并从实例说明相位分析在机器状态监测与故障诊断中的重要性。
This paper mainly introduces the principle of phase analysis of rotating machinery vibration signal and the application of phase analysis in condition monitoring and fault diagnosis, and illustrates the importance of phase analysis in machine condition monitoring and fault diagnosis.