A new approach to extract weak periodic signal from strong noise is proposed to pick up some weak signals in the fault diagnosis of mechanical equipment.
为提取机械设备故障诊断中的某些微弱信号，给出一种新的提取强背景噪声中微弱周期信号的方法。
The periodic oscillators at critical state are immune to noise and have sensitive dependence on weak sine signals or phase-coded signals at the same time.
临界混沌状态的周期振子对噪声具有免疫力，而对微弱的正弦信号或相位编码信号比较敏感。
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