本文選題：雙噴嘴擋板伺服閥 + Simulink仿真�。� 參考：《武漢科技大學(xué)》2011年碩士論文

【摘要】：電液伺服閥是伺服系統(tǒng)的核心元件,起著連接電氣和液壓的紐帶作用。它輸入控制電信號(hào)輸出調(diào)制的流量和壓力。其中雙噴嘴擋板電液伺服閥因其響應(yīng)速度快、功率放大率高、直線性好、死區(qū)小等優(yōu)點(diǎn),在伺服系統(tǒng)中得到廣泛的使用。它通過改變輸入馬達(dá)的電流來控制銜鐵的轉(zhuǎn)角,改變擋板與噴嘴的間隙,使噴嘴兩端形成壓力差,從而推動(dòng)滑閥閥芯移動(dòng),最終達(dá)到控制輸出壓力與流量的目的。衡量伺服閥的重要性能包括靜態(tài)特性和動(dòng)態(tài)特性,其中通過后者可直接反映出伺服閥的響應(yīng)速度與穩(wěn)定特性。因此,對(duì)雙噴嘴擋板伺服閥動(dòng)態(tài)特性的研究,對(duì)于正確設(shè)計(jì)和測(cè)試電液伺服閥具有十分重要的意義。 本文以雙噴嘴擋板電液伺服閥為研究對(duì)象,首先對(duì)其結(jié)構(gòu)和工作原理進(jìn)行分析,了解每部分功能與工作特性;再詳細(xì)推算出閥的動(dòng)態(tài)數(shù)學(xué)模型,從力矩馬達(dá)到閥控缸,最后得出伺服閥總的方框圖與動(dòng)態(tài)數(shù)學(xué)模型。通過給定部分初始條件,計(jì)算出一組符合穩(wěn)定性的伺服閥的各項(xiàng)結(jié)構(gòu)參數(shù)和功能參數(shù)。另外,在計(jì)算伺服閥主回路的主要參數(shù)時(shí),了解到伺服閥的動(dòng)態(tài)性能不是由某一個(gè)參數(shù)決定的,而是由很多參數(shù)相互聯(lián)系、共同決定的。所以在進(jìn)行仿真分析前,先對(duì)主要參數(shù)進(jìn)行甄選,把影響系統(tǒng)穩(wěn)定性和響應(yīng)速度的重要參數(shù)作為目標(biāo)參數(shù),進(jìn)行重點(diǎn)分析。最后通過MATLAB包含的Simulink仿真軟件對(duì)其仿真,通過仿真分析系統(tǒng)開環(huán)和閉環(huán)伯德圖和閥的動(dòng)態(tài)性能,研究目標(biāo)函數(shù)與伺服閥穩(wěn)定性和響應(yīng)速度的關(guān)系,并驗(yàn)算理論公式推理的正確性。 總之,通過對(duì)系統(tǒng)的開環(huán)和閉環(huán)傳遞函數(shù)的仿真,得出主回路的階躍響應(yīng)圖和開環(huán)、閉環(huán)伯德圖。再對(duì)仿真的圖進(jìn)行分析,并不斷改變目標(biāo)參數(shù)的大小,從而能得出目標(biāo)參數(shù)與伺服閥穩(wěn)定性與頻寬的關(guān)系。分析的結(jié)果與運(yùn)用理論公式推導(dǎo)的結(jié)果相吻合。而且通過Simulink仿真得到的開環(huán)和閉環(huán)伯德圖能更直觀、更準(zhǔn)確地反映目標(biāo)參數(shù)與伺服閥穩(wěn)定性和響應(yīng)的關(guān)系,說明了模擬仿真是可行的。同時(shí)也為伺服閥的優(yōu)化設(shè)計(jì)提供了參考和依據(jù)。
[Abstract]:Electro-hydraulic servo valve is the core component of servo system and acts as a link between electric and hydraulic. It inputs and controls the flow and pressure of the electrical signal output modulation. The double nozzle baffle electro-hydraulic servo valve is widely used in servo system because of its high response speed, high power magnification, good linearity and small dead zone. It controls the angle of the armature by changing the current of the input motor, changes the gap between the baffle and the nozzle, and forms the pressure difference between the two ends of the nozzle, thus promoting the movement of the valve core of the slide valve, and finally achieving the purpose of controlling the output pressure and the flow rate. The important performance of servo valve includes static and dynamic characteristics, through which the response speed and stability of servo valve can be directly reflected. Therefore, the study of the dynamic characteristics of the double nozzle baffle servo valve is of great significance for the correct design and test of the electro-hydraulic servo valve. In this paper, the double nozzle baffle electro-hydraulic servo valve is taken as the research object. Firstly, the structure and working principle of the valve are analyzed, and the function and working characteristics of each part are understood, then the dynamic mathematical model of the valve is deduced in detail, and the valve control cylinder is obtained from the moment horse. Finally, the total block diagram and dynamic mathematical model of servo valve are obtained. The structural and functional parameters of a set of servo valves which accord with the stability are calculated by the given initial conditions. In addition, in calculating the main parameters of the servo valve main loop, it is found that the dynamic performance of the servo valve is not determined by a single parameter, but by many parameters related to each other. So before the simulation analysis, the main parameters are selected, and the important parameters which affect the stability and response speed of the system are taken as the target parameters, and the emphasis is put on the analysis. Finally, through the Simulink simulation software included in MATLAB, the dynamic performance of the open loop and closed loop Birdchart and the valve are simulated, and the relationship between the objective function and the stability and response speed of the servo valve is studied. And check the correctness of theoretical formula reasoning. In a word, through the simulation of open loop and closed loop transfer function of the system, the step response diagram of the main loop, the open loop and the closed loop Boulder graph are obtained. Then the simulation diagram is analyzed, and the size of the target parameter is changed constantly, so that the relationship between the target parameter and the servo valve stability and frequency width can be obtained. The results of the analysis are in agreement with those derived from the theoretical formula. Moreover, the open-loop and closed-loop Boulder diagrams obtained by Simulink simulation can reflect more intuitively and accurately the relationship between the target parameters and the stability and response of the servo valve, which shows that the simulation is feasible. At the same time, it also provides reference and basis for the optimal design of servo valve.
【學(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH137.52

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