硅钼棒加热炉双闭环控制技术研究模式识别与智能系统专业论文.docxVIP

重庆大 重庆大学硕士学位论文 英文摘要 PAGE PAGE IV current and one loop for the temperature. This research then comes up with an adaptive dual closed loop fuzzy logic PID controller model. The inner loop is used to control the current with a PI controller while the outer loop is based on threshold or the adaptive fuzzy logic PID controller. This research shows that the latter adaptive approach can yield better results than the simple threshold or a pure PID technique. When properly set up, the adaptive fuzzy logic has the ability to track the changing conditions of the furnace over time and can a prior give better results. Finally, through a series of simulation, the research goes on to show that the precept is in fact correct. It is compared the result of the novel adaptive fuzzy logic PID controller with the traditional PID. It is also introduced power cut, interference and time-variability of the furnace characteristics in our simulation model to mimic the real-world as closely as possible. The results suggest that the adaptive technique can lead to closer and more accurate control of the MoSi2 furnace temperature and hence the viscometer. In addition, the adaptive fuzzy logic PID controller seems to be more robust under time-varying conditions and interference. Keywords: MoSi2 furnace, long time-delay, double closed-loop control, adaptive fuzzy PID control 重庆大 重庆大学硕士学位论文 目 录 目 录 中文摘要 I 英文摘要 II 1 绪 论1 1.1 论文研究背景和意义 1 1.2 硅钼棒加热炉控制系统的研究现状 3 1.3 本文主要研究内容 6 1.4 本章小结 6 2 大滞后过程控制系统的控制技术分析 7 2.1 大滞后环节7 2.2 大滞后环节的特性分析8 2.3 大滞后环节对控制品质的影响 9 2.4 大滞后系统控制算法分析 12 HYPERLINK \l _TOC_250002 PID 控制 12 HYPERLINK \l _TOC_250001 Smith 预估控制 17 2.4.3 模糊控制 19 HYPERLINK \l _TOC_250000 2.4.4 自适应模糊 PID 控制 20 2.5 本章小结 23 3 硅钼棒加热炉的双闭环控制系统的设计 24 3.1 硅钼棒加热炉的工作特性分析及其控制难点 24 3.2 硅钼棒加热炉的数学模型 25 3.3 硅钼棒加热炉双闭环控制系统的基本结构与基本原理 27 3.4 双闭环控制器的设计 28 3.4.1 内环电流控制器设计 28 3.4.2 外环电流控制器设计 30 3.5 本章小结 39 4 硅钼棒加热炉温度控制系统的仿真研究 40 4.1 仿真工具介绍 40 4.2 系统仿真模型的建立 41 4.3 MATLAB 仿真实验和结果分析 42 4.3.1 无干扰时仿真分析 43 4.3.2