渤海大学本科毕业论文(设计).doc

渤海大学本科毕业论文(设计) 渤海大学本科毕业论文(设计)
水箱液位控制系统
The Water Tank Liquid Level Control System
学院(系): 工学院
专业: 自动化
学号: 10060253
学生姓名: 顾晓君
入学年度: 2010年
指导教师: 刘慧巍
完成日期: 2014 年 04月15 日
渤海大学
Bohai University
摘要  
在人们生活以及工业生产等诸多领域经常涉及到液位和流量的控制问题, 例如居民生活用水的供应, 饮料、食品加工, 溶液过滤, 化工生产等多种行业的生产加工过程, 通常需要使用蓄液池, 蓄液池中的液位需要维持合适的高度, 既不能太满溢出造成浪费, 也不能过少而无法满足需求。因此液面高度是工业控制过程中一个重要的参数,特别是在动态的状态下,采用适合的方法对液位进行检测、控制,能收到很好的效果。 PID控制(比例、积分和微分控制)是目前采用最多的控制方法。 
本文主要是对一水箱液位控制系统的设计过程,涉及到液位的动态控制、控制系统的建模、PID算法、传感器和调节阀等一系列的知识。作为单容水箱液位的控制系统,其模型为一阶惯性函数,控制方式采用了PID算法,调节阀为电动调节阀。选用合适的器件设备、控制方案和算法,是为了能最大限度地满足系统对诸如控制精度、调节时间和超调量等控制品质的要求
关键词:水箱液位控制;PID控制;过程控制
The Water Tank Liquid Level Control System
Abstract
In people's daily life and industrial production and other fields often involves the control of liquid level and flow, such as household water supply, beverage, food processing, filtering solution, chemical production and other industries in the production process, often need to use a liquid storage tank, a liquid storage tank liquid level of the need to maintain the appropriate height, both can not be too full to overflow caused by waste, also cannot too little and cannot meet the demand of. Therefore the liquid level height is an important parameter in industry process control, especially in the dynamic state, adopting suitable methods to detect, control of the liquid level, can get good effect. PID (proportional, integral and differential) control method is the most.
This paper is the design process of a water tank liquid level control system, involving the dynamic control, level control system modeling, PID algorithm, sensor and valve and so on a series of. As the control system of single tank water level, the model is a one order inertial function, control method using the PID algorithm, control valve electric control valve. Choose the appropriate device, control scheme and algorithm, in order to maximize system such as control precision, time and quantity of regulation and control quality requirements.
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