本文選題：壓電驅(qū)動精密流量閥 + 柔性鉸鏈��； 參考：《南昌大學》2016年碩士論文

【摘要】：流量閥是液壓系統(tǒng)中的一個重要元件,其作用是控制流體的流向、流量以及壓力。一般工程上需要對流體進行控制,用的大多是傳統(tǒng)的電磁力矩馬達驅(qū)動式的控制閥,這種閥結(jié)構(gòu)復雜、體積大、控制精度低,難以滿足對微流量流體的精確控制,特別是高壓下的微流量流體的精確控制。本文利用壓電陶瓷材料作為驅(qū)動元件,配合金屬橡膠材料,設計了一種新型的壓電驅(qū)動精密流量閥。由于壓電陶瓷具有微/納米級的精密位移輸出能力,使得壓電驅(qū)動精密流量閥能利用其高位移分辨率控制閥芯的開啟,從而實現(xiàn)精密的流量輸出控制,并且將金屬橡膠安裝在閥的進出口處,利用其節(jié)流減壓特性,使閥口前后的壓差減小,閥中流體速度變化平緩,減小氣蝕破壞。本文所設計的閥采用柔性鉸鏈杠桿機構(gòu)作為動力源與閥芯運動機構(gòu)之間的動力傳輸裝置和位移放大裝置。采用有限元分析軟件對柔性鉸鏈杠桿機構(gòu)進行靜動態(tài)特性分析,得到了機構(gòu)的靜變形云圖和Von Mises Stress云圖。根據(jù)分析結(jié)果,對柔性鉸鏈杠桿機構(gòu)進行了參數(shù)優(yōu)化,優(yōu)化結(jié)果使得該機構(gòu)在滿足閥芯運動具有良好的動態(tài)特性下,柔性鉸鏈的體積比優(yōu)化前減少了16%。實現(xiàn)了柔性鉸鏈杠桿機構(gòu)輕量化的目標。另外,本文基于有限元軟件平臺,對壓電驅(qū)動精密流量閥的閥芯及其周圍流場建立了參數(shù)化的有限元模型,進行了流固耦合分析,先通過對流體域的流場分析,取得了閥穩(wěn)態(tài)時的內(nèi)部流體壓力場的分布規(guī)律;再將流體分析結(jié)果導入到對閥芯固體域的靜力學分析中,對閥芯固體域進行靜力學分析,得到流固耦合作用下閥芯的靜變形云圖及Von Mises Stress云圖。根據(jù)流固耦合分析結(jié)果,對閥芯進行結(jié)構(gòu)參數(shù)優(yōu)化。優(yōu)化后,在保證閥芯工作可靠性的條件下,閥芯體積減少了13.5%,實現(xiàn)了閥芯的輕量化。
[Abstract]:Flow valve is an important component in hydraulic system. Its function is to control the flow direction, flow rate and pressure of fluid. In general engineering, it is necessary to control the fluid, most of which are the traditional electromagnetic torque motor driven control valve. This kind of valve has complex structure, large volume and low control precision, so it is difficult to satisfy the precise control of micro-flow fluid. In particular, the precise control of micro-flow fluids under high pressure. In this paper, a new kind of piezoelectric precise flow valve is designed by using piezoelectric ceramic as driving element and metal rubber material. Because piezoelectric ceramics have micro / nanometer precision displacement output ability, piezoelectric drive precision flow valve can use its high displacement resolution to control the opening of valve core, thus realizing precise flow output control. The metal rubber is installed at the inlet and outlet of the valve, and the pressure difference before and after the valve is reduced by using its throttling and decompression characteristics, and the fluid velocity in the valve changes slowly and the cavitation damage is reduced. The valve designed in this paper uses the flexible hinge lever mechanism as the power transmission device and displacement amplifying device between the power source and the movement mechanism of the valve core. The static and dynamic characteristics of the flexible hinge lever mechanism are analyzed by finite element analysis software, and the static deformation cloud diagram and Von Mises stress cloud diagram of the mechanism are obtained. According to the analysis results, the parameters of the flexible hinge lever mechanism are optimized. The optimization results show that the volume of the flexure hinge is 16 times less than that before the optimization when the mechanism meets the good dynamic characteristics of the valve core movement. The lightweight target of flexible hinge lever mechanism is realized. In addition, based on the finite element software platform, a parameterized finite element model of the valve core and its surrounding flow field is established, and the fluid-solid coupling analysis is carried out. Firstly, the flow field in the fluid domain is analyzed. The distribution law of internal fluid pressure field is obtained, and then the fluid analysis results are introduced into the static analysis of the valve core solid field, and the valve core solid field is analyzed statically. The static deformation cloud diagram and Von Mises stress cloud diagram of the valve core under fluid-solid coupling are obtained. According to the results of fluid-solid coupling analysis, the structural parameters of the valve core are optimized. After optimization, under the condition of ensuring the reliability of the spool, the volume of the spool is reduced by 13.5and the weight of the spool is realized.
【學位授予單位】：南昌大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TH137.52

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