基于磁流變液的先導式溢流閥研究
發(fā)布時間：2018-10-05 19:57
【摘要】：液壓控制閥是液壓系統(tǒng)的核心控制元件之一,其性能好壞將直接影響執(zhí)行元件的靜、動態(tài)特性及系統(tǒng)的整體性能。隨著高新技術的發(fā)展,液壓傳動的工程應用對液壓元件的要求越來越高,傳統(tǒng)的先導式溢流閥不能實現智能化的控制,元件制造精度要求較高,且對油液污染較敏感,已不能滿足現代工程應用的要求。 磁流變液(Magnetorheological Fluid或MRF)是智能材料的一種,以其奇特的流變效應廣泛應用在機械、汽車、航空、建筑、醫(yī)療等領域,逐漸形成一種新的技術——磁流變技術,日益受到人們的關注。本文利用磁流變液的磁流變機理為控制原理,設計一種磁流變先導式溢流閥實現智能和自動化控制。 本文概述了磁流變技術的國內外研究現狀,介紹了磁流變液的組成、磁流變效應機理、工作模式、性能及制備方法,提出了磁流變先導式溢流閥設計過程中所面臨的關鍵技術問題,針對關鍵問題采取從選擇適宜的材料到合理的磁路設計結構設計等方面解決問題。利用有限元分析軟件ANSYS對設計的磁流變先導閥進行了磁場分析,表明將工作間隙設計在鐵芯和閥芯之間可提高工作間隙內磁流變液的磁場強度；并對主閥進行了流場分析,表明主閥芯采用拋物線球頭形狀,閥芯半錐角大于閥座,出口處采用圓弧過渡可以降低磁流變先導式溢流閥進出口兩邊的壓差,減小氣蝕發(fā)生的可能性,并使液流快速射向閥芯后部,避免閥座處發(fā)生氣蝕。建立了磁流變先導式溢流閥的數學模型,利用Matlab/Simulink軟件對磁流變先導式溢流閥進行了靜、動態(tài)特性仿真分析,表明磁流變先導式溢流閥的性能滿足設計的要求,驗證了結構設計的合理性。
[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.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：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.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH137.521
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