动静压气体轴承的设计及特性研究
发布时间：2018-11-08 10:28
【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。
[Abstract]:The static and static pressure gas bearing is a new type of gas bearing. It combines the advantages of static and dynamic gas bearings and avoids the shortcomings of the two kinds of bearings. The non-solid contact caused by the static pressure of the gas avoids the dry friction of the bearing at the starting and stopping stage, and the dynamic pressure effect of the bearing during the high speed rotation can avoid the continuous high pressure gas supply needed to support the bearing. This greatly reduces power consumption. In this paper, the static and static gas bearing is taken as the research object, and the modeling, characteristic analysis and structural parameter optimization of the bearing in the flow field are studied deeply. The main contents are as follows: the applicability of different meshing and numerical calculation methods to gas bearing is analyzed. In this paper, the boundary layer mesh is studied with single hole static thrust gas bearing as the research object, and the model with different mesh density is numerically simulated. At the same time, the laminar flow model and laminar and turbulent flow model are used to calculate the flow field of hydrostatic gas bearing. The comparison between the calculation results and the experimental results shows that the boundary layer meshes can better study the characteristics of the flow field near the wall, and the partitioning method can achieve good computational efficiency and accuracy. The mixed model can not only increase the accuracy of calculation, but also reflect the effect of laminar and turbulent flow more realistically and intuitively. The influence of bearing structure and working state on the characteristics of static and static gas bearing is studied by using three dimensional flow field calculation method. The three-dimensional model of static and dynamic gas bearing is established, and the boundary layer mesh, partitioning and local encryption are used, and the mixture model of laminar flow and turbulence is used for 3D calculation. The results show that the three-dimensional modeling method can effectively calculate the flow field of the gas bearing, and the reliability of the simulation results is verified by comparing with the design example. In the flow field, the flow mode of the dynamic pressure groove is turbulent, the flow mode in the film clearance is laminar flow, the air supply pressure under the static pressure working state can increase the bearing capacity and rigidity, but it will increase the air consumption. The spiral groove can bring about obvious dynamic pressure effect in the high speed operation, but increasing the rotational speed will increase the power consumption of the system and bring the unstable factors. The above research results provide the design theory of the hydrostatic gas bearing, which can be used for reference in the design and calculation of the same kind of hydrostatic bearing.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.3
本文编号：2318191
[Abstract]:The static and static pressure gas bearing is a new type of gas bearing. It combines the advantages of static and dynamic gas bearings and avoids the shortcomings of the two kinds of bearings. The non-solid contact caused by the static pressure of the gas avoids the dry friction of the bearing at the starting and stopping stage, and the dynamic pressure effect of the bearing during the high speed rotation can avoid the continuous high pressure gas supply needed to support the bearing. This greatly reduces power consumption. In this paper, the static and static gas bearing is taken as the research object, and the modeling, characteristic analysis and structural parameter optimization of the bearing in the flow field are studied deeply. The main contents are as follows: the applicability of different meshing and numerical calculation methods to gas bearing is analyzed. In this paper, the boundary layer mesh is studied with single hole static thrust gas bearing as the research object, and the model with different mesh density is numerically simulated. At the same time, the laminar flow model and laminar and turbulent flow model are used to calculate the flow field of hydrostatic gas bearing. The comparison between the calculation results and the experimental results shows that the boundary layer meshes can better study the characteristics of the flow field near the wall, and the partitioning method can achieve good computational efficiency and accuracy. The mixed model can not only increase the accuracy of calculation, but also reflect the effect of laminar and turbulent flow more realistically and intuitively. The influence of bearing structure and working state on the characteristics of static and static gas bearing is studied by using three dimensional flow field calculation method. The three-dimensional model of static and dynamic gas bearing is established, and the boundary layer mesh, partitioning and local encryption are used, and the mixture model of laminar flow and turbulence is used for 3D calculation. The results show that the three-dimensional modeling method can effectively calculate the flow field of the gas bearing, and the reliability of the simulation results is verified by comparing with the design example. In the flow field, the flow mode of the dynamic pressure groove is turbulent, the flow mode in the film clearance is laminar flow, the air supply pressure under the static pressure working state can increase the bearing capacity and rigidity, but it will increase the air consumption. The spiral groove can bring about obvious dynamic pressure effect in the high speed operation, but increasing the rotational speed will increase the power consumption of the system and bring the unstable factors. The above research results provide the design theory of the hydrostatic gas bearing, which can be used for reference in the design and calculation of the same kind of hydrostatic bearing.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.3
【引证文献】
相关硕士学位论文 前1条
1 朱捚峰;动静压气体止推轴承的承载特性研究[D];大连海事大学;2013年
，本文编号：2318191
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