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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600MW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。
This paper attempts to use acoustic emission technology to detect the rubbing failure between the radial tilting pad bearing pad and the rotating shaft, and a corresponding experimental study is carried out on the modular 600MW turbine generator modular testing platform. The experimental results show that the periodic pulse signal appears in the time-domain waveform of the AE signal when the pad and the spindle touch each other, and the pulse period is the same as the axis rotation period. In addition, by properly arranging the positions of the AE sensors on the bearing seat, the positions of the pads for rubbing can be inferred based on the amplitude changes of the AE signals measured at different positions and the time difference between arrival of the AE pulses on the two sensors. Therefore, acoustic emission technology can be used as a useful complement to fault diagnosis of tilting pad radial sliding bearings.