空间环境下磁性液体密封设计及性能研究

发布时间：2018-04-16 08:15

本文选题：空间环境 + 磁性液体　；参考：《北京交通大学》2014年硕士论文

【摘要】：作为一种新型功能材料,磁性液体具有独特的性质,既具有液体的流动性,又具有固体磁性材料所具有的磁性。并且随着科学和技术的发展,磁性液体的应用领域正在不断扩大。到目前为止,磁性液体已经广泛应用于转轴动密封、静密封、传感器元件、减震器等。磁性液体的气体密封技术已经相当成熟。磁性液体由三部分组成,分别为基载液、磁性颗粒以及表面活性剂。没有表面活性剂,磁性颗粒将产生分离而不能均匀的混合在基载液中。表面活性剂包裹磁性颗粒使他们在基载液中相互排斥,这将阻止颗粒的沉淀并保持稳定的分布状态。通过众多学者的多年努力,磁性液体已经成功应用于很多领域,旋转密封是其中应用之一。磁性液体的性能对磁性液体密封的能力有很大的影响。空间环境复杂多变,为了提高密封的可靠性,需要采用无损检测方法确定磁性液体的分布状态。本文作者主要进行了以下几个方面的研究： (1)根据空间站舷窗的工作环境,设计出三种不同结构的磁性液体密封装置,分别为极齿在极靴内径上、极齿在极靴外径上、盲孔轴,并加工成实物； (2)用ANSYS有限元分析软件根据电磁场基本理论对设计的磁性液体密封装置进行模拟分析,得出了密封间隙中磁场的分布情况,同时也得出了密封件的理论密封耐压能力; (3)研究出用于磁性液体密封装置的无损检测方法,并提出了完整的检测方案。
[Abstract]:As a new functional material, magnetic liquid has unique properties, both liquid fluidity and solid magnetic material.With the development of science and technology, the application of magnetic fluid is expanding.So far, magnetic fluid has been widely used in rotating shaft dynamic seal, static seal, sensor elements, shock absorbers and so on.Gas sealing technology for magnetic liquids is quite mature.The magnetic liquid consists of three parts: base liquid, magnetic particle and surfactant.Without surfactants, magnetic particles will be separated and unevenly mixed in the base solution.The surfactant encapsulates the magnetic particles, which repel each other in the base solution, which prevents the particles from precipitating and maintains a stable distribution.Through the efforts of many scholars, magnetic fluid has been successfully applied in many fields, among which rotary seal is one of the applications.The performance of magnetic fluid has great influence on the sealing ability of magnetic fluid.The space environment is complex and changeable. In order to improve the reliability of seal, nondestructive testing method is needed to determine the distribution of magnetic fluid.The author of this paper mainly studies the following aspects:1) according to the working environment of the space station sidescuttles, three kinds of magnetic liquid sealing devices with different structures are designed. They are polar teeth in the inner diameter of the polar boots, polar teeth in the outer diameter of the polar boots, blind hole shafts, and processed into physical objects.2) the magnetic fluid sealing device is simulated and analyzed by using ANSYS finite element analysis software according to the basic theory of electromagnetic field, and the distribution of magnetic field in the seal clearance is obtained, and the theoretical sealing pressure resistance of the seal is also obtained.A nondestructive testing method for magnetic liquid sealing device is developed, and a complete testing scheme is proposed.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB42;TB34

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