【作者】 陈龙兴；

【导师】 马文琦；

【作者基本信息】 大连海事大学 ， 机械电子工程， 2012， 硕士

【摘要】 动静压气体轴承是一种新型结构的气体轴承,它综合了静压与动压气体轴承的优点,同时也避免了二者的不足,由于气体的静压作用而产生的无固体接触使得轴承在启停阶段的干摩擦得以避免,而轴承在高速旋转时产生的动压效应可以避免支承轴承所需的持续高压供气,这大大减小了功耗。本文以动静压气体轴承为研究对象,针对其流场内的建模、特性分析及结构参数优化等内容进行了深入研究,具体的研究内容包括：分析了不同网格划分及数值计算方法对气体轴承的适用性。以单孔静压止推气体轴承为研究对象,研究了边界层网格,并对不同网格疏密程度下的模型进行了数值仿真计算；同时使用层流模型及层流与紊流二者混合模型对静压气体轴承的流场进行了计算。计算结果与实验结果的对比分析表明,边界层网格能更好地对近壁面流场特性进行研究；分区网格划分方法可以达到很好的计算效率和精度；采用混合模型,不仅可以增大计算的精度,同时能更真实和直观体现层流和紊流的流场效果。采用三维流场计算方法研究了轴承结构及工作状态对动静压气体轴承特性的影响。建立动静压气体轴承的三维模型,采用边界层网格、分区划分和局部加密的方法进行网格划分；使用层流与湍流的混合模型进行三维计算。计算结果表明：三维建模的计算方法,可以有效地对气体轴承的流场进行计算,同时通过与设计实例的对比,验证了仿真结果的可靠性；在流场内,动压槽部分的流动方式为湍流,气膜间隙内的流动方式为层流；提升静压工作状态下的供气压力,能够提高轴承的承载能力和刚性,但会增大耗气量；螺旋槽能够在高速运转过程中带来明显的动压效应,但增大转速会增加系统的功耗,并带来不稳定因素。以上研究成果提供了动静压气体轴承的设计理论,可供设计、计算同类动静压轴承时参考。更多还原

【Abstract】 Hydrostatic dynamic gas lubricated bearing is a new structured gas bearing, it synthesized the advantage of aerostatic and aerodynamic bearing. At the same time, It avoid those of the shortage, the non-solid-contract caused by static pressure effect avoid the dry friction, and the hydrodynamic effect brought by high speed can avoid the continued high pressure gas supply, which greatly reduced the power consumption.In this paper, the hydrostatic dynamic gas lubricated bearing was taken as a subject, and the modeling in flow field, the way of numerical analysis method, the reliability of simulation results and characteristics of the bearing were taken on in-depth research. The main research work includes:The applicability of different meshing and calculation methods on gas lubricated bearings is analysed. The thrust aerostatic bearings are chose as a subject, and the research was taken on boundary layer grid, different mesh densities and calculating models. Meanwhile, One test rig was built for measuring the pressure distribution in flow field. The result indicate:boundary layer grid can do well study on wall. Considering the calculation accuracy and efficiency, choose the division of grid partition method. When flow field have different flow mode, the hybrid model should be used, it can increase the accuracy of the calculation.The numerical calculation method was used to study the influence of structure and work state to hydrostatic dynamic gas lubricated thrust bearing. The three-dimension models of bearings are built, the boundary layer grid, division of grid partition method and hybrid model of laminar and turbulent are used in modelling. The calculation results show that:the three-dimensional calculation method can effectively calculate the flow field of bearing, and the reliability of the simulation result is verified through the contrast with design example. In flow field, part of spiral groove is turbulent flow, and the gas film part is laminar flow. Increasing the supply pressure of the static pressure work state, the load and stiffness of bearing is improved, but it also lead to the rising of gas consumption. Increasing the rotating speed of the dynamic pressure work state, the spiral groove can bring obvious hydrodynamic pressure effect, and the higher the speed is, the better hydrodynamic effect it have, but it will add system consumption and bring unstable factors.The research results provide the design theory of hydrostatic dynamic gas lubricated bearing. The data and charts in this dissertation can be referenced for designing and calculating the same kind of hydrostatic dynamic gas lubricated bearing.更多还原