The bent-axis piston pump is the core component of electrohydrostatic actuators (EHA) in aerospace applications, and its wear of key friction interfaces is greatly related to the healthy operation of pumps. The leakage of the piston ring-cylinder bore interface (PRCB), as the important part of the return oil flow of the pump house that commonly assesses the wear of key friction interfaces in piston pumps, is changed with the rotation speed. Thus, the wear of key friction interfaces is usually inaccurate by using the leakage of PRCB. In order to obtain the relationship between the PRCB leakage and the rotation speed, an elastohydrodynamic lubrication model is proposed. First, the proposed model includes a minimum film thickness model of PRCB to analyze the dynamic change of oil film of PRCB when subject to the elastohydrodynamic lubrication. After that, a mathematical model of PRCB is induced by combining the minimum film thickness model with the flow equation, which helps produce the effects of the oil film on the leakage of PRCB. The proposed model is verified by numerical simulation and experiment. The results show that the leakage of PRCB has a negative effect on the return oil flow of the pump case in the range of rotation speed of 700–1300 r/min and discharge pressure of 10–20 MPa. Furthermore, the leakage of PRCB is proportional to the rotation speed, but the return oil flow of the pump case is decreased. The effects of rotation speed are enhanced under the high discharge pressure conditions.

中文翻译：

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基于弹性流体动力润滑和转速的弯轴活塞泵活塞环-缸孔接口泄漏

弯轴活塞泵是航空航天应用中的静液压执行器（EHA）的核心组件，其关键摩擦界面的磨损与泵的健康运行密切相关。活塞环-缸孔接口（PRCB）的泄漏是泵室回油流的重要部分，通常评估活塞泵中关键摩擦接口的磨损，该泄漏随转速而变化。因此，通过使用PRCB的泄漏，关键摩擦界面的磨损通常是不准确的。为了获得PRBC泄漏与转速之间的关系，提出了一种弹性流体动力润滑模型。首先，所提出的模型包括PRBC的最小膜厚模型，以分析在进行弹性流体动力润滑时PRBC的油膜的动态变化。之后，通过将最小膜厚模型与流动方程相结合，得出了PRBC的数学模型，这有助于产生油膜对PRBC泄漏的影响。通过数值模拟和实验验证了所提模型的有效性。结果表明，PRBC的泄漏在转速700-1300 r / min和排出压力10-20 MPa的范围内对泵壳的回油流量有负面影响。此外，PRBC的泄漏与转速成正比，但泵壳的回油流量却减少了。在高排气压力条件下，转速的影响得到增强。通过数值模拟和实验验证了所提模型的有效性。结果表明，PRBC的泄漏在转速700-1300 r / min和排出压力10-20 MPa的范围内对泵壳的回油流量有负面影响。此外，PRBC的泄漏与转速成正比，但泵壳的回油流量却减少了。在高排气压力条件下，转速的影响得到增强。通过数值模拟和实验验证了所提模型的有效性。结果表明，PRBC的泄漏在转速700-1300 r / min和排出压力10-20 MPa的范围内对泵壳的回油流量有负面影响。此外，PRBC的泄漏与转速成正比，但泵壳的回油流量却减少了。在高排气压力条件下，转速的影响得到增强。但泵壳的回油流量减少。在高排气压力条件下，转速的影响得到增强。但泵壳的回油流量减少。在高排气压力条件下，转速的影响得到增强。