基于磁流变液的先导式溢流阀研究
发布时间：2018-10-05 19:57
【摘要】：液压控制阀是液压系统的核心控制元件之一,其性能好坏将直接影响执行元件的静、动态特性及系统的整体性能。随着高新技术的发展,液压传动的工程应用对液压元件的要求越来越高,传统的先导式溢流阀不能实现智能化的控制,元件制造精度要求较高,且对油液污染较敏感,已不能满足现代工程应用的要求。 磁流变液(Magnetorheological Fluid或MRF)是智能材料的一种,以其奇特的流变效应广泛应用在机械、汽车、航空、建筑、医疗等领域,逐渐形成一种新的技术——磁流变技术,日益受到人们的关注。本文利用磁流变液的磁流变机理为控制原理,设计一种磁流变先导式溢流阀实现智能和自动化控制。 本文概述了磁流变技术的国内外研究现状,介绍了磁流变液的组成、磁流变效应机理、工作模式、性能及制备方法,提出了磁流变先导式溢流阀设计过程中所面临的关键技术问题,针对关键问题采取从选择适宜的材料到合理的磁路设计结构设计等方面解决问题。利用有限元分析软件ANSYS对设计的磁流变先导阀进行了磁场分析,表明将工作间隙设计在铁芯和阀芯之间可提高工作间隙内磁流变液的磁场强度；并对主阀进行了流场分析,表明主阀芯采用抛物线球头形状,阀芯半锥角大于阀座,出口处采用圆弧过渡可以降低磁流变先导式溢流阀进出口两边的压差,减小气蚀发生的可能性,并使液流快速射向阀芯后部,避免阀座处发生气蚀。建立了磁流变先导式溢流阀的数学模型,利用Matlab/Simulink软件对磁流变先导式溢流阀进行了静、动态特性仿真分析,表明磁流变先导式溢流阀的性能满足设计的要求,验证了结构设计的合理性。
[Abstract]:Hydraulic control valve is one of the core control components of hydraulic system. Its performance will directly affect the static and dynamic characteristics of the actuator and the overall performance of the system. With the development of high and new technology, the engineering application of hydraulic transmission requires more and more hydraulic components. The traditional pilot relief valve can not realize the intelligent control, the manufacturing precision of the components is high, and it is sensitive to oil pollution. It can not meet the requirements of modern engineering application. Magnetorheological fluid (Magnetorheological Fluid or MRF) is a kind of smart material. It is widely used in the fields of machinery, automobile, aviation, architecture, medical treatment and so on for its peculiar rheological effect. In this paper, a magneto-rheological pilot relief valve is designed to realize intelligent and automatic control by using the magneto-rheological mechanism as the control principle. In this paper, the research status of magnetorheological technology at home and abroad is summarized, and the composition, mechanism, working mode, properties and preparation methods of MRF are introduced. The key technical problems in the design of the magnetorheological pilot relief valve are put forward. The key problems are solved from the selection of suitable materials to the reasonable design of magnetic circuit structure. The magnetic field analysis of the magneto-rheological pilot valve designed by the finite element analysis software ANSYS shows that the magnetic field intensity of the magnetorheological fluid in the working gap can be increased by designing the working gap between the iron core and the valve core, and the flow field of the main valve is analyzed. The results show that the main valve core adopts the shape of parabola ball head, the half cone angle of the valve core is larger than the valve seat, the pressure difference on both sides of the inlet and outlet of the magnetorheological pilot relief valve can be reduced and the possibility of cavitation can be reduced by adopting circular arc transition at the outlet. The liquid flow is rapidly fired into the back of the valve core to avoid cavitation at the seat. The mathematical model of the magnetorheological pilot relief valve is established, and the static and dynamic characteristics of the magnetorheological pilot relief valve are simulated and analyzed by using Matlab/Simulink software. The results show that the performance of the magnetorheological pilot relief valve meets the design requirements. The rationality of the structure design is verified.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137.521
[Abstract]:Hydraulic control valve is one of the core control components of hydraulic system. Its performance will directly affect the static and dynamic characteristics of the actuator and the overall performance of the system. With the development of high and new technology, the engineering application of hydraulic transmission requires more and more hydraulic components. The traditional pilot relief valve can not realize the intelligent control, the manufacturing precision of the components is high, and it is sensitive to oil pollution. It can not meet the requirements of modern engineering application. Magnetorheological fluid (Magnetorheological Fluid or MRF) is a kind of smart material. It is widely used in the fields of machinery, automobile, aviation, architecture, medical treatment and so on for its peculiar rheological effect. In this paper, a magneto-rheological pilot relief valve is designed to realize intelligent and automatic control by using the magneto-rheological mechanism as the control principle. In this paper, the research status of magnetorheological technology at home and abroad is summarized, and the composition, mechanism, working mode, properties and preparation methods of MRF are introduced. The key technical problems in the design of the magnetorheological pilot relief valve are put forward. The key problems are solved from the selection of suitable materials to the reasonable design of magnetic circuit structure. The magnetic field analysis of the magneto-rheological pilot valve designed by the finite element analysis software ANSYS shows that the magnetic field intensity of the magnetorheological fluid in the working gap can be increased by designing the working gap between the iron core and the valve core, and the flow field of the main valve is analyzed. The results show that the main valve core adopts the shape of parabola ball head, the half cone angle of the valve core is larger than the valve seat, the pressure difference on both sides of the inlet and outlet of the magnetorheological pilot relief valve can be reduced and the possibility of cavitation can be reduced by adopting circular arc transition at the outlet. The liquid flow is rapidly fired into the back of the valve core to avoid cavitation at the seat. The mathematical model of the magnetorheological pilot relief valve is established, and the static and dynamic characteristics of the magnetorheological pilot relief valve are simulated and analyzed by using Matlab/Simulink software. The results show that the performance of the magnetorheological pilot relief valve meets the design requirements. The rationality of the structure design is verified.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137.521
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