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为了解决轴承"边缘效应"问题,采用有限元法针对功能梯度材料圆柱滚子轴承滚动体的轴向材料性能对轴承最大等效应力和最大接触应力的影响进行了研究,结果表明:当滚动体轴向材料性能分布合理时,在一定程度上可以降低轴承滚动体的最大等效应力和最大接触应力,降低或避免轴承滚动体"边缘效应",提高轴承承载能力。 相似文献
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陶瓷金属耦合材料在轴承工业的应用使轴承陶瓷化,实现了陶瓷金属航天材料在轴承工业中的普及化和民用化。在不更换设备、不改变技术、工艺和材料的基础上,冲破材料本身的极限,使轴承的寿命、精度、档次产生一个质的飞跃。 相似文献
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首先论述了气体动压润滑轴承 (以下简称气动轴承 )摩擦副材料表面改性处理的选择原则 ,然后在此基础上提出了多种适用于气体动压润滑轴承材料的表面改性处理方法 相似文献
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针对超临界二氧化碳(S-CO2)动力机组在启动和停止阶段气体轴承产生非常大的摩擦磨损,以及气体轴承承载力低、刚度低、阻尼小、稳定性较差等问题,设计并改进一种新型动静压S-CO2润滑径向可倾瓦轴承结构。设计并搭建S-CO2润滑轴承实验台,针对于实验台转子刚启动和极低转速工况,对新型S-CO2润滑动静压径向轴承在静压状态下的动态特性进行实验研究,得到轴承的动态刚度和动态阻尼,并分析静压对轴承动态性能的影响。实验结果表明,设计的S-CO2动静压径向可倾瓦轴承在启停阶段,在轴瓦与轴颈之间产生了足够的静压压力,可将二者完全分隔开,从而能减少启停阶段的摩擦磨损;随着静压压力的增大,轴承X、Y方向上的整体刚度、主阻尼都增大,且2个方向的主刚度系数差别不大,而交叉刚度和交叉阻尼都接近于0。研究结果为进一步揭示S-CO2润滑径向轴承动压状态特性提供参考。 相似文献
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Static and dynamic characteristics of two-lobe journal bearings lubricated with couple-stress fluids are studied. The load-carrying capacity, the stiffness and damping coefficients, the non-dimensional critical mass, and the whirl ratio are determined for various values of the couple stress parameter l. The results obtained are compared with the characteristics of two-lobe bearings lubricated with Newtonian fluids. It is found that the effect of the couple stress parameter is very significant on the performance of the journal bearing. The stability is improved compared to bearings lubricated with Newtonian fluids. 相似文献
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The possibilities of using advanced ceramics in water-lubricated journal bearings were studied by performing tests on journal bearings lubricated with water. The materials studied were two aluminas (Al2O3), a zirconia-toughened alumina (ZTA), a partially stabilized zirconia (PSZ), a sintered silicon carbide (SiC), a reaction-bonded silicon carbide (SiSiC) and a β′-sialon. From the present study it can be concluded that water-lubricated journal bearings utilizing silicon carbide against itself offer good performance. Moderate performance can be achieved with an all-alumina sliding pair, provided that the loads remain low and that a high surface quality can be ensured. 相似文献
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By the use of electrically conducting fluids as lubricants together with the application of externally magnetic fields, the dynamic lubrication problems of parallel step slider bearings lubricated with a nonconducting fluid are extended in this paper. A closed‐form solution has been derived for the magneto‐hydrodynamic characteristics of wide parallel step slider bearings. Comparing with the bearing lubricated with nonconducting fluids, the magneto‐hydrodynamic parallel step slider bearings signify an improvement in the load capacity, as well as the dynamic stiffness and damping coefficients. A numerical example and calculated values are also provided in tables for engineers in bearing selection and designing. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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Performance in plain bearing applications of commercially available self-lubricating materials, including ptfe and other plastics and metals containing solid lubricants, is described. They are most useful as either dry bearings or bearings in marginally lubricated situations. Some specific applications are included 相似文献
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刚度系数和阻尼系数是反映滑动轴承动力响应特性的重要的特性系数。对于以液体为润滑介质的多油叶轴承,本文给出了其动力特性系数的算法,采用数值方法进行了算例计算。 相似文献