基于声发射的可倾瓦径向滑动轴承碰摩故障诊断

该文尝试使用声发射技术检测径向可倾瓦轴承瓦块与转轴的碰摩故障，并在600 MW汽轮机发电机组模化实验台上进行了相应的实验研究。实验结果表明，当瓦块与转轴发生碰摩时，声发射信号的时域波形中出现周期性的脉冲信号，而且脉冲周期与轴旋转周期相同。此外，通过合理布置声发射传感器在轴承座上的位置，可以根据不同位置测量到的声发射信号幅值变化，以及声发射脉冲到达2个传感器的时间差，推断出发生碰摩的瓦块位置。因此，声发射技术能够作为可倾瓦径向滑动轴承故障诊断的有益补充。

Rubbing Fault Diagnose of Tilting Pad Journal Bearing by Acoustic Emission

To detect rubbing fault between the pad and the shaft of the tilting pad journal bearings, the acoustic emission technology was proposed. The experiments were carried out on a test rig which was modeling the 600 MW turbine-generator unit. The results of the experiment indicate that there are periodic pulses in the time domain waveform of acoustic emission signals when the impact and rubbing occurrence. And the pulse cycle is the same as the rotation period of the shaft. Furthermore, location of rubbing pad can be determined according to the amplitude of the acoustic emission signals measured by the sensors of different location and the time difference of the acoustic emission pulse arriving at the sensors, if the acoustic emission sensor locations on the bearing house are arranged rightly. So, the acoustic emission technology can be employed as complement of fault diagnosis of tilting pad journal bearing.