Abstract A key parameter in hydrodynamic journal bearing performance is lubricant layer thickness around the circumference of the shaft-bearing interface. In the present work, the ultrasonic amplitude, phase change and resonant dip techniques are applied to obtain circumferential film thickness profiles in a bespoke journal bearing test platform under a range of shaft-aligned, shaft-misaligned and shut-down operating conditions. Film thickness results are compared against the Raimondi-Boyd theoretical prediction model and eddy current sensor measurements. By using an on-line referencing technique, the amplitude and phase change models demonstrated high accuracy for thin films and the resonant dip technique enabled film measurements within the bearing thick film region. Thus, applying the three methods simultaneously allowed analysis of lubricant films around the bearing circumference.

中文翻译：

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通过超声波技术测量轴颈轴承的圆周油膜厚度

摘要 流体动力轴颈轴承性能的一个关键参数是轴-轴承界面周围的润滑剂层厚度。在目前的工作中，应用超声波振幅、相变和共振倾角技术，在一系列轴对中、轴未对准和停机操作条件下，在定制的轴颈轴承测试平台上获得圆周膜厚分布。将薄膜厚度结果与 Raimondi-Boyd 理论预测模型和涡流传感器测量值进行比较。通过使用在线参考技术，振幅和相变模型证明了薄膜的高精度，共振倾角技术能够在轴承厚膜区域内进行薄膜测量。因此，