Observations of Film Thickness Profile and Cavitation Around a Journal Bearing Circumference
Observations of Film Thickness Profile and Cavitation Around a Journal Bearing Circumference
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DOI：
10.1080/10402000801947717
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发表时间：
2008-03
影响因子：
2.1
通讯作者：
S. Kasolang;R. Dwyer-Joyce
中科院分区：
文献类型：
--
作者：
S. Kasolang;R. Dwyer-Joyce
滑动轴承中的油膜形成和气穴区域的范围是对承载能力的重要贡献。在目前的工作中，超声波的方法已被用来测量周围的工作径向轴承的圆周膜厚分布。超声波脉冲在油层上的反射可以用来确定油膜厚度。传感器安装在空心轴内，信号通过滑环。轴颈轴承在一系列载荷和转速下运行。传感器连续地脉冲和接收，因为它扫过周围的衬套圆周。这使得能够建立完整的膜厚度分布。在收敛区域，预测的膜形状与经典润滑理论的预测吻合得很好。当空化发生时，油-空气和铝-空气界面的存在会破坏超声信号。从测量结果中可以清楚地看到气穴现象。最小膜厚度，姿态角，和空化的发病进行了比较与理论解。
The film formation in a journal bearing and the extent of the cavitated region is an important contribution to load carrying capacity. In the present work, an ultrasonic method has been used to measure the film thickness profile around the circumference of an operating journal bearing. The reflection of an ultrasonic pulse at an oil layer can be used to determine the film thickness. A transducer was mounted inside a hollow shaft and the signal passed through slip rings. The journal bearing was run at a series of loads and rotational speeds. The transducer continuously pulsed and received as it swept around the bush circumference. This enabled the full film thickness profile to be established. In the converging region the predicted film shape agrees well with predictions from classical lubrication theory. When cavitation occurs, the presence of oil-air and aluminum-air interfaces disrupts the ultrasonic signal. Evidence of cavitation appearance is very clear from the measurement results. The minimum film thickness, the attitude angle, and the onset of cavitation are compared with theoretical solutions.