箔片结构对箔片气体轴承性能影响的分析

发布时间：2018-05-28 01:38

本文选题：波箔式箔片气体轴承 + 箔片结构　；参考：《中国科学院研究生院（工程热物理研究所）》2011年硕士论文

【摘要】：自从1969年被Garrett AiResearch应用于飞机空气循环装置上,箔片气体轴承已经发展了四代,轴承的承载力和稳定性都有了大幅提高。但到目前为止,箔片轴承发展的三大难题,即高承载力；良好的高温启停特性；可靠的、可控的设计方法和设计准则,仍然没有得到有效地解决。国内在箔片轴承研究中还较为落后,根本原因还是对轴承本身的动力学机理不清楚。本文针对箔片气体轴承特有的箔片结构进行分析,研究箔片结构如何影响轴承性能的以及不同代箔片轴承进化的原因。主要内容如下： (1)本文对箔片结构的变形进行了相关计算,考虑了波箔波纹间的相互作用、箔片结构间的库仑摩擦、波箔波纹曲面变形等因素,最终得到了波箔波纹的径向刚度公式以及平箔的变形公式。 (2)本文对影响平箔和波箔变形的因素进行了分析。包括箔片结构的几何参数、选用材料以及波箔结构的分布形态。研究表明,可以通过改变以上三种参数让箔片结构的刚度分布更加均匀,刚度更大。 (3)本文建立了等温条件下考虑平箔和波箔变形、箔片结构内库仑摩擦和波箔波纹间相互作用的模型,通过将气膜厚度方程和等温气体Reynolds方程耦合,利用MATLAB软件编程计算。采用承载力和姿态角作为评价轴承承载性能和稳定性的参数。计算表明,本文采用模型的计算结果与NASA试验结果符合的较好。 (4)本文对箔片结构对轴承性能的影响情况进行了分析。研究表明,箔片结构的刚度越大,刚度分布越均匀对于箔片轴承的承载力和稳定性越有好处。箔片结构分布的改变,对于扩大动压气膜内部高压区的范围,以及减弱端泄效应有着非常大的作用。依据本文的结论,对箔片轴承结构进行优化,其优化效果非常明显。
[Abstract]:The foil gas bearing has been developed for four generations since it was applied to the aircraft air circulation unit by Garrett AiResearch in 1969. The bearing capacity and stability have been greatly improved. But up to now, the three major problems in the development of foil bearings, namely, high bearing capacity, good high temperature start and stop characteristics, reliable and controllable design methods and design criteria, have not been solved effectively. The study of foil bearing in China is still relatively backward, the fundamental reason is not clear about the dynamic mechanism of the bearing itself. In this paper, the characteristic foil structure of foil gas bearing is analyzed, and the influence of foil structure on bearing performance and the evolution of foil bearing in different generations are studied. The main contents are as follows: In this paper, the deformation of foil structure is calculated by considering the interaction between ripples, the Coulomb friction between foil structures, the deformation of corrugated surface of foil, and so on. Finally, the radial stiffness formula of ripple and the deformation formula of flat foil are obtained. In this paper, the factors affecting the deformation of flat foil and wave foil are analyzed. It includes the geometric parameters of foil structure, the choice of materials and the distribution of foil structure. The results show that the stiffness distribution of chaff structure can be more uniform and the stiffness is larger by changing the above three parameters. In this paper, a model considering the deformation of foil and foil, Coulomb friction and ripple interaction in foil structure under isothermal condition is established. By coupling the film thickness equation with the Reynolds equation of isothermal gas, the model is calculated by using MATLAB software. Bearing capacity and attitude angle are used as parameters to evaluate bearing performance and stability. The calculation results show that the calculated results of the model are in good agreement with the NASA test results. The influence of foil structure on bearing performance is analyzed in this paper. The results show that the greater the stiffness of the foil structure, the more uniform the stiffness distribution is for the bearing capacity and stability of the foil bearing. The change of foil structure distribution plays an important role in enlarging the range of the high pressure region inside the hydrodynamic film and reducing the end leakage effect. According to the conclusion of this paper, the optimization effect of foil bearing structure is very obvious.
【学位授予单位】：中国科学院研究生院（工程热物理研究所）
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH133.3

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