单容水箱液位控制系统设计.doc

单容水箱液位控制系统设计
分类号密级
UDC
过程控制系统设计作业
学生姓名
任课教师 xxxxxx 学号 xxxx
工程学院自动化及测控系院、系、中心
专业年级 xxxx级自动化
提交日期
中国海洋大学
文档历史
摘要
摘要
本论文以单容水箱为被控对象,给出了单闭环控制系统、串级控制系统和前馈反馈控制系统的设计方案,实现对水箱液位的控制。本论文还针对每种控制系统,在Matlab的Simulink中建立仿真模型进行仿真,得到仿真曲线,并且利用仿真曲线分析控制系统的性能,例如最大动态偏差、调节时间、衰减率和积分性能指标IAE等。单闭环控制系统的设计包括P、I、PI和PID的设计。本文分别通过衰减频率特性法(理论整定法)和衰减曲线法(工程整定法)对控制器参数进行了整定。本论文还通过比较各控制系统的仿真曲线和系统性能指标,对各种控制系统设计方案进行了比较,
发现串级控制和前馈反馈控制可提高系统性能。
关键词: PID;串级;前馈反馈;参数整定;Simulink
I
Abstract
Design on Water Level Control in a Tank
Abstract
This thesis provides design methods of single closed-loop control system, cascade control system and feed forward control system about the controlled object a
single water tank , and it achieves the goal of controlling level. For every kind of control system, simulation model is established by using simulation tool Matlab, simulation curves can analysis the performance of control system, such as the maximum percent overshoot, settling time, attenuation rate and IAE. The design of single closed-loop
control system includes designs of P, I, PI and PID. The controller parameter is tuned by frequency response of attenuation rate and the attenuation curve .All the control design methods included pared by simulation curves and performance indexes and we finally find that cascade control and feed forward control are able to improve system’s performance.
Keywords: PID;Cascade;Feedforward- feedback;Parameter tuning;Simulink
II
目录
目录
摘要.................................................................................................................................. I ABSTRACT ............................................................................................................................ II 1
2
3 设计要求及内容......................................................................................................... 1 单容水箱系统建模..................................................................................................... 3 单闭环控制系