When early faults accur, the background noise is heavy, it is difficult to extract the latent periodic components successfully using second order cyclostationary analysis alone.

• 摘要由于噪声的严重干扰，在滚动轴承早期故障时，仅仅利用二阶循环平稳分析方法往往较难成功提取出信号中潜在的有用周期信息。