Detection of the rubbing-caused impacts for rotor–stator fault diagnosis using reassigned scalogram
Detection of the rubbing-caused impacts for rotor–stator fault diagnosis using reassigned scalogram
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DOI：
10.1016/j.ymssp.2003.09.007
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发表时间：
2005-03
影响因子：
8.4
通讯作者：
Zhike Peng;F. Chu;P. Tse
中科院分区：
文献类型：
--
作者：
Zhike Peng;F. Chu;P. Tse
定子表面与转子表面的摩擦碰撞是旋转机械中常见的故障现象。在旋转机械中，碰摩现象经常发生在小间隙处。这种缺陷可能会迅速恶化，并最终导致机器的灾难性故障。它不仅会中断服务或生产，而且会导致重大的经济损失。为了进一步认识碰摩的影响，本文详细分析了碰摩的原因、碰摩的发生以及碰摩严重时的现象。比较了传统尺度图和重新分配尺度图对碰摩影响的监测效果。结果表明，碰摩时，不仅会引起转子基频及其谐波的幅值增大，而且会引起某些高频分量的幅值增大。摩擦越严重，高频分量越高越多。模拟碰摩信号和实验碰摩信号的测试结果表明，重新分配尺度图的方法能够更有效地测量碰摩引起的碰撞，因为它可以提供更好的碰撞集中度，同时干扰更少。此外，撞击的确切发生时间和频率也更容易确定。总之，由于摩擦的严重性增加而具有更多高频分量的现象，以及由重新分配的尺度图提供的对冲击的清晰识别，可以明确地帮助机器操作员检测旋转机械的定子和转子之间发生的摩擦的发生并确定其严重性。
Impacts generated from the surface of a stator rubbing against the surface of a rotor during its rotation is a common defective phenomenon which often occurs in a rotating machine. The rubbing often occurs at the positions with small clearances in rotating machinery. This defect may deteriorate rapidly and finally cause the catastrophic breakdown of the machine. It will not only interrupt services or production, but also lead to substantial economic loss. To further understand the rubbing-caused impacts, a detailed analysis is presented in this paper to explain the cause of rubbing, its occurrence and phenomenon if the severity of rubbing becomes serious. A comparison has also been conducted to investigate the effectiveness of monitoring the rubbing-caused impacts by using conventional scalograms and reassigned scalograms. The results show that when rubbing occurs, its impacts lead to an increase of magnitudes not only at the fundamental rotational frequency and its harmonics, but also at some high-frequency components. The more severe the rubbing, the higher and the more components at high frequencies. Both the simulated rubbing signals and experimental rubbing signals collected from a test rig have proven that the method of reassigned scalograms is more effective in measuring rubbing-caused impacts as it can provide a better concentration of impacts with less interference. Moreover, the exact occurrence time and frequency of impacts are also easier to be identified. In summary, the phenomenon of having more high-frequency components due to the increasing severity in rubbing, and the clear identification of impacts provided by reassigned scalograms, can definitely help a machine operator to detect the occurrence and determine the severity of rubbing occurring between the stator and the rotor of a rotary machinery.