【摘要】：電液伺服閥是伺服系統(tǒng)的核心,伺服閥決定了整個系統(tǒng)性能好壞。對電液伺服閥的流場特性和動態(tài)特性進行研究,以此為依據(jù)來改進伺服閥的性能,具有一定的理論意義與工程實用價值。 本論文介紹了雙噴嘴擋板式電液伺服閥的基本結(jié)構(gòu)與工作原理,并推導出雙噴嘴擋板閥各環(huán)節(jié)的基本數(shù)學公式。主要進行了力矩馬達的磁路分析,建立了馬達力矩方程,并通過對雙噴嘴擋板閥前置級和功率級的分析,得到噴嘴擋板壓力—流量方程、主閥芯流量連續(xù)性方程、主閥芯運動方程和主閥芯閥口流量方程,得到伺服閥各環(huán)節(jié)的傳遞函數(shù)及伺服閥總的傳遞函數(shù)。 以威格士SM4-20雙噴嘴擋板式伺服閥做為原型閥,根據(jù)伺服閥前置的尺寸,應用Pro/E軟件建立前置級流場的三維簡化模型,并運用GAMBIT對流場模型進行網(wǎng)格劃分。運用計算流體力學方法,對噴嘴擋板級進行了流場仿真,獲得閥的壓力分布、速度分布等,并做出閥的壓力曲線和流量曲線。 在原型閥流場模擬的基礎上,改變閥的幾個重要參數(shù)。對改變參數(shù)后的模型進行仿真計算,獲得不同參數(shù)下的模型特性曲線,得到最優(yōu)參數(shù)。利用FLUENT軟件中的混合模型,求解出流場中流體的壓力、氣體含量及速度分布,及空穴現(xiàn)象發(fā)生的主要部位,并對這些部位進行參數(shù)優(yōu)化,獲得最優(yōu)結(jié)構(gòu)參數(shù)。 分析了影響伺服閥動態(tài)性能的參數(shù),并提出相應的改進方案。利用MATLAB軟件中Simulink模塊,對伺服閥的動態(tài)特性進行分析,驗證改進方案的可行性,并進行參數(shù)優(yōu)化。 本文從流場的角度出發(fā),構(gòu)建了雙噴嘴擋板式電液伺服閥的數(shù)學模型,以FLUENT仿真軟件為工具,分別研究在單相流模型和混合模型下,雙噴嘴擋板閥前置級的流場分布,并對幾個重要參數(shù)進行尺寸優(yōu)化。以Simulink軟件為工具,研究影響伺服閥動態(tài)特性的主要參數(shù)。該流程為雙噴嘴擋板閥的產(chǎn)品設計與研發(fā)具有一定的參考價值,同時對其他類型伺服閥的仿真有一定的借鑒意義。
[Abstract]:Electro-hydraulic servo valve is the core of servo system, and servo valve determines the performance of the whole system. The flow field characteristics and dynamic characteristics of electro-hydraulic servo valve are studied on the basis of which to improve the performance of servo valve, which has certain theoretical significance and practical value in engineering. In this paper, the basic structure and working principle of double nozzle baffle electro-hydraulic servo valve are introduced, and the basic mathematical formulas of each link of double nozzle baffle valve are derived. The magnetic circuit analysis of the torque motor is carried out, and the torque equation of the motor is established. Through the analysis of the front stage and power level of the double nozzle baffle valve, the pressure-flow equation of the nozzle baffle and the flow continuity equation of the main valve core are obtained. The transfer function of each link of the servo valve and the total transfer function of the servo valve are obtained by the motion equation of the main valve core and the flow equation of the main valve core valve. Taking the Vickers SM4-20 double nozzle baffle servo valve as the prototype valve, according to the front size of the servo valve, the three-dimensional simplified model of the front stage flow field is established by using Pro/E software, and the flow field model is meshed by GAMBIT. The flow field at the nozzle baffle level is simulated by computational fluid dynamics (CFD). The pressure distribution and velocity distribution of the valve are obtained, and the pressure curve and flow curve of the valve are made. Based on the simulation of the flow field of the prototype valve, several important parameters of the valve are changed. The model with different parameters is simulated and calculated, and the characteristic curves of the model under different parameters are obtained, and the optimal parameters are obtained. The mixed model in FLUENT software is used to solve the pressure, gas content and velocity distribution of the fluid in the outflow field, as well as the main parts of the hole phenomenon, and the parameters of these parts are optimized to obtain the optimal structural parameters. The parameters that affect the dynamic performance of servo valve are analyzed, and the corresponding improvement scheme is put forward. Using Simulink module in MATLAB software, the dynamic characteristics of servo valve are analyzed, the feasibility of the improved scheme is verified, and the parameters are optimized. In this paper, the mathematical model of double nozzle baffle electro-hydraulic servo valve is constructed from the point of view of flow field. The flow field distribution at the front stage of double nozzle baffle valve under single phase flow model and mixed model is studied by using FLUENT simulation software as a tool. Several important parameters are optimized. Using Simulink software as a tool, the main parameters affecting the dynamic characteristics of servo valve are studied. This process has certain reference value for the product design and research and development of double nozzle baffle valve, and has certain reference significance for the simulation of other types of servo valve.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TH137.5

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