共查询到19条相似文献,搜索用时 171 毫秒
1.
2.
3.
本文分析了温度对润滑剂流变特性的影响,揭示了温度变化使润滑剂表现出明显的非牛顿特性。进一步的数值计算表明润滑油膜存在有限承载能力,从而提出了一种由于温度影响而引起油膜破裂的润滑失效模型,为预测滑动轴承的润滑状态、改进设计提供了新的理论依据。 相似文献
4.
5.
生物摩擦磨损润滑剂的润滑特性 总被引:6,自引:2,他引:4
关节转换已广泛应用于关节炎晚期治疗,外伤致残和滑瘤切除手术中。关节转换材料的耐磨性能会直接影响转换关节的使用寿命和使用质量。蒸馏水、盐水、血浆、血清等均被用作生物摩擦磨损研究的润滑剂,但是对这些润滑剂的润滑特性并未认真考察。本文应用TLT-1型弹流试验台对血浆在内的几种生物摩擦磨损润滑剂的润滑特性进行了研究,结果表明血浆的润滑性能最好。 相似文献
6.
血液润滑人工器官具有其它润滑剂不可比拟的优越性,但由于血液的特殊性,其润滑性能受到诸多因素的影响,对影响血液润滑性能的主要因素进行了分析探讨。指出血液的组分变化、剪切率、血细胞的聚集、变形、温度等因素的改变会引起血液粘度的变化,影响血液的流动性,进而影响到血液的润滑性能;摩擦界面的材料表面特性会影响到吸附膜的组成,从而影响到血液润滑状态。 相似文献
7.
8.
《机械工程学报》2020,(1)
研究了四种不同含碳量的环烷烃润滑膜在不同负载下的边界润滑行为。建立具有正弦曲面凸峰的粗糙面边界润滑系统模型,采用分子动力学模拟了四种润滑膜分别在25~500 MPa的四种负载下沿膜厚方向的密度分布。在系统的上、下固体壁面施加方向相反的剪切速度,计算出壁面原子的应力、固液界面摩擦力、正压力和摩擦因数。试验测量了环己烷油膜的摩擦因数。结果表明,分子含碳量不同的四种环烷烃润滑剂均出现分层现象,随着润滑剂分子含碳量的增加,密度分布曲线中间区域的波谷值越高,层间的原子数越多,分层越不明显;润滑剂分子含碳量越大,承载能力越高;环己烷和环十二烷润滑膜在50 MPa时相继破裂,环二十四烷润滑膜在100 MPa时破裂,环四十八烷润滑油膜承载能力超过500 MPa;模拟计算边界润滑状态下环己烷油膜的摩擦因数,符合试验测量值。 相似文献
9.
10.
人工关节润滑系统研究进展 总被引:1,自引:0,他引:1
从人工关节润滑机理的理论计算、人工滑液的试验研究及仿生润滑系统设计3个方面,对人工关节润滑系统的研究现状进行了综合评述。指出今后应加强对润滑液的主要组分润滑协同效应、人工润滑剂自身性能和润滑机制、仿生关节润滑系统的研究。 相似文献
11.
Ultra-high speed machining technology enables high efficiency, high precision and high integrity of machined surface. Previous researches of hybrid bearing rarely consider influences of solid particles... 相似文献
12.
13.
14.
15.
This article aims at presenting a numerical study of the behaviour of fluid film subjected to a periodic squeeze action. Three numerical codes based on JFO theory have been developed and compared. The first code supposes the lubricant compressibility while the two other ones use the remplishment (filling up) notion. The equations from these two versions are discretized by the finite differences method and the finite elements method. The goal is to illustrate the lubricant film behaviour during an inversion phase of the applied dynamic load and rapid speeds change and determine the model and the numeric method able to predict all the hydrodynamic characteristics of a thin lubricant film subjected to periodic loading. The study demonstrates the finite element (FE) code efficiency and the limit of the finite difference (FD) code that supposes the film compressibility. It shows also the effects of the frequency and the average film thickness on the film load-carrying capacity and the rupture. 相似文献
16.
《Tribology International》2012,45(12):1659-1667
This article aims at presenting a numerical study of the behaviour of fluid film subjected to a periodic squeeze action. Three numerical codes based on JFO theory have been developed and compared. The first code supposes the lubricant compressibility while the two other ones use the remplishment (filling up) notion. The equations from these two versions are discretized by the finite differences method and the finite elements method. The goal is to illustrate the lubricant film behaviour during an inversion phase of the applied dynamic load and rapid speeds change and determine the model and the numeric method able to predict all the hydrodynamic characteristics of a thin lubricant film subjected to periodic loading. The study demonstrates the finite element (FE) code efficiency and the limit of the finite difference (FD) code that supposes the film compressibility. It shows also the effects of the frequency and the average film thickness on the film load-carrying capacity and the rupture. 相似文献
17.
高剪切稳态载荷条件下人体血液润滑模型与仿真 总被引:2,自引:1,他引:2
根据血液流变学和流体力学理论,建立了血液在高剪切稳态载荷条件下血液润滑的数学模型。结合外场驱动微型轴流式血泵计算了血泵叶轮转子轴承在血液润滑条件下润滑膜的压力分布、承载能力、摩擦力、摩擦功耗等参数。分析了摩擦润滑指标与轴承配合间隙及叶轮转子转速之间的关系。结果表明,轴承配合间隙越小、转速越高,轴承的承载能力越大,但小间隙不利于血液分子的充分流动,高速将明显增加摩擦功耗。外场驱动血泵转子轴承配合间隙应选为0.002mm。 相似文献
18.
19.
Various phenomena are revealed under EHL and micro-EHL conditions, such as the properties of the lubricant under high pressure, traction, and the load-bearing capacity of the lubricant film, and are discussed in the present paper. A new lubrication regime, thin film lubrication, has been discussed. The theoretical and practical significance of research on thin film lubrication is elaborated. Finally, the characteristics describing thin film lubrication and its main research directions are suggested. 相似文献