液位系统的控制器设计毕业设计.doc

毕业论文（设计） 题 目： 液位系统的控制器设计 系部名称： 专业班级： 学生姓名： 学 号： 指导教师： 教师职称： 201 年 月 日 摘 要 液位是工业过程生产中经常遇到的控制对象之一，对所需的控制对象进行精确的控制，关系到产品的质量，是保障生产效果和安全的重要问题。因而，液位的控制具有重要的现实意义和广泛的应用前景。 近年来，随着控制理论的深入研究，出现了许多新的控制算法。但是，以PID为原理的各种控制器仍是过程控制中不可或缺的基本控制单元。根据液位系统的特点，设计合适的PID控制器对其进行液位控制，不仅成本低，而且控制效果很好，具有较高的实用价值。 本文通过实验的方法，确立的被控对象的数学模型。并采用多种方法确定被控对象的传递函数。主要完成了以下工作：首先，通过实验测试法对水箱进行数学建模，并用MATLAB进行仿真，验证其数学模型的正确性。接着，分析对比作图法和计算法分别得出的数学模型，通过仿真比较，确立最接近的数学模型。然后对PID控制器的参数进行整定。采用基于Ziegler－Nichols法,C-C工程法，稳定边界法对液位系统进行PID控制器参数的整定，并用MATLAB进行仿真。分析对比了几种方法的性能。 关键字：液位系统，PID控制器，参数整定，MATLAB仿真 Parameters Design of Liquid Level Controller Abstract The liquid level is one of the control objects which is often encountered in industrial production process. Giving the precise level control to the control objects, is related to the quality of the product, and is a guarantee of production and the important problem of safety. Thus, the liquid level control has important practical significance and broad application prospect. In recent years, with the in-depth research of the control theory , appeared a lot of new control algorithm. However, with PID as the principle of various controller is an indispensable basic process control control unit. According to the liquid level system characteristic, to design the appropriate PID controller for the liquid level control, not only the cost is low, but also has the good control effect and high practical value. In this paper, through the experimental method, established the mathematics model of the controlled object, and use a variety of methods to determine the transfer function of the controlled object. Mainly completed the following work: firstly, the mechanism of model analysis method. Through the experimental test on the tank for mathematical modeling, and using MATLAB simulation, verified the correctness of the mathematical model. Then, analysis and comparison of drawing and calculating