基于MATLAB的双喷嘴挡板电液伺服阀动态仿真

发布时间：2018-06-02 16:36

本文选题：双喷嘴挡板伺服阀 + Simulink仿真　；参考：《武汉科技大学》2011年硕士论文

【摘要】：电液伺服阀是伺服系统的核心元件,起着连接电气和液压的纽带作用。它输入控制电信号输出调制的流量和压力。其中双喷嘴挡板电液伺服阀因其响应速度快、功率放大率高、直线性好、死区小等优点,在伺服系统中得到广泛的使用。它通过改变输入马达的电流来控制衔铁的转角,改变挡板与喷嘴的间隙,使喷嘴两端形成压力差,从而推动滑阀阀芯移动,最终达到控制输出压力与流量的目的。衡量伺服阀的重要性能包括静态特性和动态特性,其中通过后者可直接反映出伺服阀的响应速度与稳定特性。因此,对双喷嘴挡板伺服阀动态特性的研究,对于正确设计和测试电液伺服阀具有十分重要的意义。本文以双喷嘴挡板电液伺服阀为研究对象,首先对其结构和工作原理进行分析,了解每部分功能与工作特性;再详细推算出阀的动态数学模型,从力矩马达到阀控缸,最后得出伺服阀总的方框图与动态数学模型。通过给定部分初始条件,计算出一组符合稳定性的伺服阀的各项结构参数和功能参数。另外,在计算伺服阀主回路的主要参数时,了解到伺服阀的动态性能不是由某一个参数决定的,而是由很多参数相互联系、共同决定的。所以在进行仿真分析前,先对主要参数进行甄选,把影响系统稳定性和响应速度的重要参数作为目标参数,进行重点分析。最后通过MATLAB包含的Simulink仿真软件对其仿真,通过仿真分析系统开环和闭环伯德图和阀的动态性能,研究目标函数与伺服阀稳定性和响应速度的关系,并验算理论公式推理的正确性。总之,通过对系统的开环和闭环传递函数的仿真,得出主回路的阶跃响应图和开环、闭环伯德图。再对仿真的图进行分析,并不断改变目标参数的大小,从而能得出目标参数与伺服阀稳定性与频宽的关系。分析的结果与运用理论公式推导的结果相吻合。而且通过Simulink仿真得到的开环和闭环伯德图能更直观、更准确地反映目标参数与伺服阀稳定性和响应的关系,说明了模拟仿真是可行的。同时也为伺服阀的优化设计提供了参考和依据。
[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.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137.52

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