Abstract: Acoustic emission waveform streaming testing technology was adopted to collect acoustic emission waveform streaming signals of rolling bearings under normal conditions and in the case of the failure of outer race, inner race and roller. The relations between frequency characteristics and the signals of acoustic emission waveform streaming were analyzed. Envelope spectrum analysis was adopted to acquire the peak frequency of acoustic emission waveform streaming signals, comparing with the theoretical value of the inherent characteristic frequency of the rolling bearings, under the condition of different faults. The experimental data show that envelope analysis can be carried out for the study of acoustic emission waveform streaming signals of rolling bearing with different kinds of faults and the early diagnosis of rolling bearings with different faults can be realized.

Key words: Envelope analysis, Acoustic emission waveform streaming, Rolling bearing, Fault diagnosis

摘要： 使用声发射波形流测试技术，采集滚动轴承正常状态及外圈故障、内圈故障和滚动体故障时的声发射波形流信号，分析声发射波形流信号与故障频率特征值间的关系。运用包络谱分析方法对滚动轴承声发射波形流信号进行分析，提取运转过程中信号峰值频率，通过与滚动轴承不同故障固有特征频率的理论值对比，发现具有很好的一致性。通过对滚动轴承声发射波形流信号的包络分析，可实现滚动轴承故障的早期诊断。

关键词: 包络谱分析, 声发射波形流, 滚动轴承, 故障诊断