Fluid-solid Interaction Model for Hydraulic Reciprocating O-ring Seals
Fluid-solid Interaction Model for Hydraulic Reciprocating O-ring Seals
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DOI：
10.3901/cjme.2013.01.085
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发表时间：
2013-01-01
影响因子：
4.2
通讯作者：
Liu Ying
中科院分区：
文献类型：
--
作者：
Liao Chuanjun;Huang Weifeng;Liu Ying
液压往复密封的弹性流体动力润滑特性对液压执行器的密封和摩擦学性能有重要影响，特别是在高参数液压系统中。许多研究只讨论了液压往复密封的弹性变形，而忽略了水动力效应。现有的液压往复O形环密封的流固耦合模型中，流固耦合效应的物理过程没有得到清晰的描述，很少有模型通过实验同时得到验证。通过探讨液压往复O形环密封流固耦合效应的物理过程，采用迭代方法建立了包括流体润滑、接触力学、粗糙面接触和弹性变形分析在内的流固耦合数值模型。利用SRV摩擦磨损试验机，对O形密封圈的弹流润滑特性进行了试验研究。得到了混合润滑条件下摩擦系数随往复运动速度的变化规律。实验结果验证了流固耦合模型的有效性。基于该模型，分别给出了液压往复O形环密封在干摩擦、混合润滑和全膜润滑条件下的弹性流体动力润滑特性，包括密封区的接触压力、油膜厚度、摩擦系数、液膜压力和粘性剪应力。所建立的流固耦合数值模型可以有效地分析液压往复O形环密封的工作特性，也可广泛应用于其他液压往复密封的研究。
Elastohydrodynamic lubrication characteristics of hydraulic reciprocating seals have significant effects on sealing and tribology performances of hydraulic actuators, especially in high parameter hydraulic systems. Only elastic deformations of hydraulic reciprocating seals were discussed, and hydrodynamic effects were neglected in many studies. The physical process of the fluid-solid interaction effect did not be clearly presented in the existing fluid-solid interaction models for hydraulic reciprocating O-ring seals, and few of these models had been simultaneously validated through experiments. By exploring the physical process of the fluid-solid interaction effect of the hydraulic reciprocating O-ring seal, a numerical fluid-solid interaction model consisting of fluid lubrication, contact mechanics, asperity contact and elastic deformation analyses is constructed with an iterative procedure. With the SRV friction and wear tester, the experiments are performed to investigate the elastohydrodynamic lubrication characteristics of the O-ring seal. The regularity of the friction coefficient varying with the speed of reciprocating motion is obtained in the mixed lubrication condition. The experimental result is used to validate the fluid-solid interaction model. Based on the model, The elastohydrodynamic lubrication characteristics of the hydraulic reciprocating O-ring seal are presented respectively in the dry friction, mixed lubrication and full film lubrication conditions, including of the contact pressure, film thickness, friction coefficient, liquid film pressure and viscous shear stress in the sealing zone. The proposed numerical fluid-solid interaction model can be effectively used to analyze the operation characteristics of the hydraulic reciprocating O-ring seal, and can also be widely used to study other hydraulic reciprocating seals.