解耦控制系统教学实验装置开发及解耦控制算法研究

【作者】 向本祥；

【导师】 喻寿益；

【作者基本信息】 中南大学 ， 机械电子工程， 2005， 硕士

【摘要】 过程控制是自动化专业的一个重要专业方向,实践性很强,针对工业过程控制中多变量耦合系统,开发解耦控制系统实验装置是提高过程控制实验教学水平,培养学生工程实践能力的迫切需要。本文阐述了自行研制的电加热炉温度解耦控制系统实验装置和实验教学软件,研究了两种工程解耦控制算法和实现方法。 本文以政府采购项目中南林学院过程控制实验室建设—解耦控制系统实验装置为研究对象,首先探讨了国内外解耦控制研究现状,采用阶跃响应实验分析了实验装置电加热炉温度系统的耦合特性。再根据系统的传递函数矩阵,采用PID对角矩阵解耦控制算法结合约束条件实现其解耦控制。然后分析了电加热炉温度系统的非线性、滞后性,提出了神经网络实现α阶时延逆系统解耦方法,从本质上实现系统的反馈线性化及解耦控制。该方法通过构造一种可用反馈实现的α阶逆系统,将系统补偿成为具有线性输入输出关系的伪线性复合系统,再用PI反馈实现伪线性复合系统的综合。实时控制结果表明,通过上述解耦方法有效地解决了电加热炉温度系统的耦合。 实验教学软件采用了Visual Basic 6.0软件开发工具、812PG高级数据采集卡的软件包及Access数据库。该软件可实现对电加热炉温度控制过程各参数的在线修改,实时温度监控,提供了良好的实验交互界面。更多还原

【Abstract】 Process control is a important field in automation specialty, strong practiced, in allusion to the MIMO system in Industry, it is very important to improve the teaching level of process controlling and enhance the practiced ability of student by exploitation the decoupling control system experimental facility. The electric furnace temperature decoupling control experimental facility, the teaching software was expatiated and two decoupling control algorithm was studied in the paper.The paper based on one of government stock item the laboratory building in Central South Forestry University---decoupling control system experimental facility, first the present status of decoupling controlling was studied, the couple of temperature system of electric furnace was analyzed by step response. Then the PID diagonal matrix decoupling control algorithm was adopted in the system based on the matrix transfer function. Then its nonlinear and hysteretic nature was analyzed essentially, NNα step delay time inverse system was adopted in the system, and the systems feedback liberalization was realized essentially. First the α step delay time inverse system was build to make the system as pseudo-linear system, and then the PI feedback loop control was used in pseudo-linear system. The result of real-time control was shown that the algorithms discussed in the paper are effective method to the furnace temperature couple system.The experimental teaching software was emboldened based on Visual Basic 6.0, software package of 812PG advanced data collection card and Access database. The control parameter can be modified online and the temperature can be monitored real-time by the software, and good interface was provided.更多还原