共查询到19条相似文献,搜索用时 109 毫秒
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EMP径向滑动轴承计入边界滑移的热弹流分析 总被引:2,自引:0,他引:2
弹性金属塑料瓦(EMP)径向滑动轴承是一种新型的轴承,轴瓦材料的特殊性使其热弹变形远大于普通金属瓦轴承,同时它所特有的边界滑移现象,对改善径向滑动轴承的润滑性能有较为明显的优越性。建立了计入边界滑移情况后对轴承3D热弹流分析的教学模型,并给出列,对其润滑机理进行了初步的分析。 相似文献
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用柔度矩阵法对径向滑动轴承的弹流润滑分析 总被引:7,自引:0,他引:7
对径向滑动轴承进行了弹流润滑分析 ,利用了有限元软件MARC产生柔度矩阵 ,以近似计算轴承的弹性变形。对比分析了径向轴承的刚性流体润滑性能和弹性流体润滑性能。计算结果和已有文献资料良好吻合 ,表明在弹流润滑分析中用柔度矩阵法计算弹性变形具有良好的精度。 相似文献
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研究了采用弹性金属塑料轴瓦时径向滑动轴承的瞬态润滑特性。建立了该轴承的三维热弹流模型,通过数值求解对比了启动过程中采用弹性金属塑料轴瓦和金属材料轴瓦时油膜和轴瓦的瞬态温度场分布、轴瓦的热弹变形量,以及转子轴心轨迹。结果表明,在启动初期弹性金属塑料瓦径向滑动轴承的瓦体温度要高于金属瓦,转子偏心率也要大于采用金属瓦时的偏心率;因润滑油在弹性金属塑料瓦径向滑动轴承轴瓦表面存在一定的滑移速度,随着油膜边界滑移作用的出现,采用弹性金属塑料瓦径向滑动轴承时的油膜温度最终低于采用金属瓦时的温度,且转子的偏心率也最终小于采用余属瓦的偏心率。 相似文献
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EMP径向滑动轴承特殊的轴瓦材料特性使得其热弹变形对轴承的润滑特性,如油膜的最小间隙、油膜压力和温度分布影响较大。为此本文建立了完整的热弹变形模型,采用有限差分的方法,通过在不同载荷的情况下,对EMP径向滑动轴承在计入和未计入热弹复合变形的两种情形进行对比,从而揭示了热弹变形影响轴承工作性能参数的内在规律。 相似文献
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本文采用差分法解二维雷诺方法,能量方程;以边界无法求解轴承瓦体的三维温度场及瓦面热弹位移;对某水电厂大型推力轴承进行了热弹流体动力润滑性能分析;比较了不同进油边温度下推力轴承热弹流分析结果,及推力轴承在升速与降速时的性能。结果表明,进油边温度对推力轴承热弹流动力润滑性能计算的准确性有较大的影响。采用进油边温度迭代所得的推力轴承热弹流动力润滑性能计算值与实测值吻合良好。 相似文献
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The thermal elastic hydro dynamic(TEHD) lubrication analysis for the thrust bearing is usually conducted by combining Reynolds equation with finite element analysis(FEA). But it is still a problem to conduct the computation by combining computational fluid dynamics(CFD) and FEA which can simulate the TEHD more accurately. In this paper, by using both direct and separate coupled solutions together, steady TEHD lubrication considering the viscosity-temperature effect for a bidirectional thrust bearing in a pump-turbine unit is simulated combining a 3D CFD model for the oil film with a 3D FEA model for the pad and mirror plate. Cyclic symmetry condition is used in the oil film flow as more reasonable boundary conditions which avoids the oil temperature assumption at the leading and trailing edge. Deformations of the pad and mirror plate are predicted and discussed as well as the distributions of oil film thickness, pressure, temperature. The predicted temperature shows good agreement with measurements, while the pressure shows a reasonable distribution comparing with previous studies. Further analysis of the three-coupled-field reveals the reason of the high pressure and high temperature generated in the film. Finally, the influence of rotational speed of the mirror plate on the lubrication characteristics is illustrated which shows the thrust load should be balanced against the oil film temperature and pressure in optimized designs. This research proposes a thrust bearing computation method by combining CFD and FEA which can do the TEHD analysis more accurately. 相似文献
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影响弹簧支承式推力轴承性能的几个因素 总被引:3,自引:0,他引:3
本文对弹簧支承式推力轴承进行了三维热弹流研究,发现变形量对轴承性能有很大影响,为此,着重分析了决定轴承变形和油膜形状分布的几个因素对轴承性能影响情况,研究表明,弹簧布置方式,轴瓦厚度和型面形状能严重改变轴承性能,在进行轴承设计时必须对上述因素进行了优化,并提出了一些优化建议。 相似文献