It is usually assumed that faulty bearings produce second-order cyclostationary (CS2) signals, and thus the natural process for their diagnostic analysis involves first the removal of first-order cyclostationary (CS1) components, such as from gears, followed by amplitude demodulation of an ‘informative’ frequency band, and subsequent envelope analysis, in which the spectrum of the (squared) envelope is inspected for signs of a fault, typically manifesting as discrete frequency components at or near one of the expected fault frequencies, the latter calculated from basic kinematic relationships.

中文翻译：

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高速轴承诊断：Surveillance 8 Safran 竞赛数据的观察结果


通常假设故障轴承产生二阶循环平稳 (CS2) 信号，因此诊断分析的自然过程包括首先去除一阶循环平稳 (CS1) 分量，例如齿轮中的一阶循环平稳 (CS1) 分量，然后对“信息性”频带，以及随后的包络分析，其中检查（平方）包络的频谱是否有故障迹象，通常表现为处于或接近预期故障频率之一的离散频率分量，后者计算如下基本的运动关系。