共查询到17条相似文献,搜索用时 62 毫秒
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根据吸附理论和分子间能量的变化规律来确定表面相互作用程度 ,以此可定义吸附层 ,得出吸附层厚度的分析计算公式。根据分子相互作用的基本理论及流体力学的基本定义得出指数型粘度修正的表达式 ,用于确定微小间隙内流体粘度的变化规律 ,用此修正模型对薄膜润滑条件下轴承的性能计算 ,同时与实验比较 ,得到比较吻合的效果 相似文献
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粘度修正雷诺方程的全域解模拟计算 总被引:19,自引:2,他引:19
根据表面吸附理论对雷诺方程进行修正,得出适用于全域的粘度修正通用方程。其计算结果在厚膜区与用雷诺方程计算的结果相符,在薄膜区与目前的报道及试验结果相一致。通用化公式描述为实际工程设计和科学分析提供了依据。 相似文献
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等效粘度修正超薄膜润滑的温度场分析 总被引:1,自引:0,他引:1
润滑剂的粘温特性影响其自身的润滑性能 ,在薄膜润滑中由于间隙极其微小 ,间隙内润滑剂流量少 ,带走的热量减少 ,影响吸附性能 ,从而可能形成更高的温升 ,对润滑剂的性能影响也将更大 ,对润滑效果的影响将超过常规的润滑状态。本文运用能量方程进行超薄膜润滑条件下的温度场分析 ,以便求解在薄膜润滑条件下轴承的润滑及承载性能 相似文献
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关于磁性轴承的径向磁力,在理论计算上有人曾用等效电流法,但这种方法不易被人们理解;本文提供了易被人们理解接受的方法,即磁荷库仑定律法。 相似文献
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考虑温度因素时等效粘度模型及轴承特性的研究 总被引:1,自引:0,他引:1
同时考虑温度和流体内能及壁面对润滑剂的强作用对润滑剂粘度的影响,在等效粘度模型的基础上,融入温度对润滑剂特性的影响,建立了粘温修正的等效粘度分析计算模型,运用该模型进行了薄膜润滑条件下的轴承特性分析计算,确立了参数与轴承性能的变化之间的关系。 相似文献
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超薄膜润滑径向轴承模拟计算 总被引:3,自引:0,他引:3
粘度是润滑剂的主要性能参数,随着油膜厚度的改变而在改变,在超薄膜润滑中特别突出,采用粘度修正雷诺方程来求解轴承的性能,对无限宽轴承来说,可得出其解析解,从而对其它轴承的计算提供依据。 相似文献
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James J. Kauzlarich 《摩擦学汇刊》2013,56(1):37-44
Prior researchers find that: Where one of two horizontal parallel plates immersed in a fluid is forced to oscillate up and down, a load may be carried, providing the fluid is compressible. Application of Reynolds equation to such a squeeze film bearing supports the condition of compressibility. However, analysis of the squeeze film bearing, including inertia terms in the Navier-Stokes equations, removes the restriction on compressibility. Theoretical design of a hydraulic squeeze bearing driven sinusoidally shows that load capacity is improved over a similar gas squeeze bearing under usual design conditions, provided cavitation is prevented. Two cases are considered of a fixed and a free bearing. Torque, work input, and the effects of centrifugal force are analysed. 相似文献
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The determination of hydrodynamic film failure has become one of the key aspects in the study of thin film lubrication (TFL) since the hydrodynamic effect of fluid film at nano-scale can be observed with recently developed experimental techniques. In the present paper, the relative optical interference intensity (ROII) technique with a resolution of 0.5 run in the vertical direction has been used to measure the film thickness. Experimental results show that the hydrodynamic effect can be clearly observed even at very low speed if the contact pressure is sufficiently low or if the viscosity of lubricant is comparatively high. When the pressure increases to a certain degree, the film will suddenly drop to the dimension of several layers of molecules and this is where the failure of the fluid film has taken place. For different viscosity of lubricants, the fluid film failure occurs at different rolling speeds and pressures. In addition, when the normal load becomes higher, a higher speed or larger viscosity is required to form the fluid film in the contact region. Finally, the effects of pressure, viscosity, and velocity on the occurrence of fluid film failure have been examined and a relationship involving the three parameters is proposed. 相似文献
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磁流体润滑滑动轴承的研制和性能研究 总被引:7,自引:0,他引:7
研制了磁流体润滑滑动轴承 ,建立了磁流体滑动轴承试验装置。对磁流体滑动轴承和传统滑动轴承进行了对比试验研究。通过大量试验的测试结果分析比较 ,发现磁流体滑动轴承能形成良好的全油膜润滑 ,产生的摩擦力比传统滑动轴承要小得多 ,因此推断出磁流体滑动轴承的承载能力和抗磨损能力大于同等条件下的传统滑动轴承。 相似文献
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ABSTRACT A basic analytical model of a hybrid journal gas bearing was set up completely for investigating the coupling between aerodynamics and aerostatics in a hybrid gas bearing under incompressible conditions, and for further improving its performance, under incompressible conditions. In this analytical model, the load-carrying capacity function is composed of five items. Apparently, there are pressure coupling and structure coupling between aerodynamics and aerostatics and when the groove distribution coefficient is 0.36, it is approximately maximum. However, this type of hybrid gas bearing structure can not be used when the pressure ratio is less than 1. 相似文献