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- 包络分析大多在原始振动加速度信号基础上进行, 受噪声干扰等因素的影响较大 通过对原始振动信号自相关函数作包络分析, 可以有效地抑制噪声, 突出反映故障调制特征-s. Most of the envelope analyses are based on original vibration accelera- tion signal,which is seriously influenced by noise interference. The noise is effectively sup