液体静压主轴的流体—结构耦合分析及动态性能研究

发布时间：2018-04-04 04:03

  本文选题：液体静压主轴　切入点：计算流体力学　出处：《哈尔滨工业大学》2011年硕士论文

【摘要】：由于液体静压主轴具有较高的刚度和承载能力,所以广泛应用于超精密加工机床中。在液体静压主轴工作的过程中,温升和油腔压力会导致结构件变形,从而影响静压主轴的工作性能。因此,研究温升和压力分布与液体静压主轴的动、静态性能的关系对提高超精密机床的加工精度具有重要的意义。 本文以液体静压主轴为研究对象,首先根据理论公式分析液体静压径向和止推轴承的静态性能,包括刚度、流量和平均温升,为后续的研究工作奠定了基础; 其次,通过流体力学软件FLUENT对液体静压主轴的有限元模型进行分析,得到液体静压主轴的温度场分布和压力场分布,并分析温度场和压力场的分布规律; 然后,通过有限元软件ANSYS和流体力学软件FLUENT之间的数据交换,建立液体静压主轴的流体-结构耦合模型,分析温度场和压力场对液体静压主轴油膜间隙的影响;基于液体静压主轴的流体-结构耦合分析结果,建立了工作状态下液体静压主轴的有限元模型,并研究了温升和压力分布对液体静压主轴静态性能的影响; 最后,通过弹簧单元来模拟液体静压轴承的刚性特性,得到了液体静压主轴系统的有限元模型;在考虑温升和压力分布的情况下,对液体静压主轴系统进行了模态分析和谐响应分析,得到了主轴系统的幅频特性曲线,并通过函数拟合得到了主轴系统的传递函数;通过主轴系统的传递函数分析了温升和压力分布对液体静压主轴系统动态性能的影响。
[Abstract]:Hydrostatic spindle is widely used in ultra-precision machine tools because of its high stiffness and bearing capacity.In the working process of hydrostatic spindle, temperature rise and oil chamber pressure will result in deformation of the structure, which will affect the working performance of the hydrostatic spindle.Therefore, it is of great significance to study the relationship between temperature rise and pressure distribution and the dynamic and static properties of hydrostatic spindle for improving the machining accuracy of ultra-precision machine tools.In this paper, the hydrostatic spindle is taken as the research object. Firstly, the static performance of hydrostatic radial and thrust bearings, including stiffness, flow rate and average temperature rise, is analyzed according to the theoretical formula, which lays a foundation for further research.Secondly, the finite element model of hydrostatic spindle is analyzed by FLUENT software, and the distribution of temperature field and pressure field of hydrostatic spindle is obtained, and the distribution law of temperature field and pressure field is analyzed.Then, through the data exchange between the finite element software ANSYS and the hydrodynamic software FLUENT, the fluid structure coupling model of the hydrostatic spindle is established, and the influence of temperature field and pressure field on the oil film clearance of the hydrostatic spindle is analyzed.Based on the fluid structure coupling analysis of the hydrostatic spindle, the finite element model of the hydrostatic spindle is established, and the influence of temperature rise and pressure distribution on the static performance of the hydrostatic spindle is studied.Finally, the stiffness of hydrostatic bearing is simulated by spring element, and the finite element model of hydrostatic spindle system is obtained.The modal analysis and harmonic response analysis of the hydrostatic spindle system are carried out, and the amplitude and frequency characteristic curves of the spindle system are obtained, and the transfer function of the spindle system is obtained by fitting the function.The influence of temperature rise and pressure distribution on the dynamic performance of hydrostatic spindle system is analyzed by the transfer function of spindle system.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH133.2

【参考文献】

中国期刊全文数据库 前3条

1 林有希,高诚辉,高济众;大型机床动态特性的整机有限元分析[J];福州大学学报(自然科学版);2003年01期

2 廖先禄 ,郭力 ,李波;新型高速液体动静压轴承的温升机理[J];轴承;2002年04期

3 陈克栋;液体静压轴承失效原因及解决措施[J];润滑与密封;1993年04期

中国博士学位论文全文数据库 前1条

1 于晓东;重型静压推力轴承力学性能及油膜态数值模拟研究[D];东北林业大学;2007年

中国硕士学位论文全文数据库 前1条

1 张艳芹;基于FLUENT的静压轴承流场及温度场研究[D];哈尔滨理工大学;2007年

，

本文编号：1708281