Ultrasonic Measurement of Rolling Bearing Lubrication Using Piezoelectric Thin Films
Ultrasonic Measurement of Rolling Bearing Lubrication Using Piezoelectric Thin Films
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DOI：
10.1115/1.3002324
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发表时间：
2009
影响因子：
2.5
通讯作者：
B. Drinkwater;Jie Zhang;K. Kirk;J. Elgoyhen;R. Dwyer-Joyce
中科院分区：
文献类型：
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作者：
B. Drinkwater;Jie Zhang;K. Kirk;J. Elgoyhen;R. Dwyer-Joyce
本文介绍了利用压电薄膜换能器激励和接收超声波信号来测量滚动轴承润滑油膜厚度的方法。高频（200 MHz）超声波是使用压电氮化铝薄膜沉积在一个非常薄的层到外轴承滚道的形式。这样就形成了总厚度小于10 μm的换能器和电极组合。通过这种方式，轴承的仪表化对壳体几何形状的破坏最小，并且可以非侵入性地测量油膜。高频换能器产生细柱状超声束，其尺寸小于典型的润滑接触椭圆。然后从润滑接触内测量润滑剂层的反射系数，并通过准静态弹簧模型提取油膜厚度。结果描述了在正常操作条件下支撑80 mm轴的深沟球轴承6016。良好的协议显示在一个范围内的负载和速度与润滑油膜厚度从弹性流体动力润滑理论提取。
This paper describes the measurement of lubricant-film thickness in a rolling element bearing using a piezoelectric thin film transducer to excite and receive ultrasonic signals. High frequency (200 MHz) ultrasound is generated using a piezoelectric aluminum nitride film deposited in the form of a very thin layer onto the outer bearing raceway. This creates a transducer and electrode combination of total thickness of less than 10 μm. In this way the bearing is instrumented with minimal disruption to the housing geometry and the oil-film can be measured noninvasively. The high frequency transducer generates a fine columnar beam of ultrasound that has dimensions less than the typical lubricated contact ellipse. The reflection coefficient from the lubricant-layer is then measured from within the lubricated contact and the oil-film thickness extracted via a quasistatic spring model. The results are described on a deep groove 6016 ball bearing supporting an 80 mm shaft under normal operating conditions. Good agreement is shown over a range of loads and speeds with lubricant-film thickness extracted from elastohydrodynamic lubrication theory.