Fuzzy-PID Compound Control for Ultra-Precision Worktable

2009 International Workshop on Intelligent Systems and Applications Pub Date : 2009-05-23 DOI:10.1109/IWISA.2009.5072881

Ping Li, Hongmei Gao, Xiao-ping Liu

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引用次数: 2

Abstract

It is difficult to establish mathematical mode for ultra-precision worktable control system, because there are several disadvantages in the system, such as varying as time, nonlinear and so on. Fuzzy control has good robustness and other advantage, such as it need not establish the mathematical mode of controlled system, but steady state precision is bad. So a new control method which combined fuzzy controller with PID controller was proposed. Because different control schemes are used in different period in whole control process, the controller has inherited character of PID control, in which there are no static error and good static stability, and character of fuzzy control, in which there are strong compatibility and good dynamic property. Simultaneously, it gets rid of the disadvantages of them. Simulation experiment for ultra precision worktable control system has been carried on by Matlab software. PID control and fuzzy-PID control have been compared. Simulation results can prove that fuzzy- PID control can achieve better results. It was an efficient control method for the ultra-precision worktable.

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超精密工作台的模糊pid复合控制

由于超精密工作台控制系统存在随时间变化、非线性等缺点，建立数学模型比较困难。模糊控制具有鲁棒性好等优点，如不需要建立被控系统的数学模型，但稳态精度较差。为此，提出了一种模糊控制器与PID控制器相结合的控制方法。由于在整个控制过程的不同阶段采用了不同的控制方案，因此该控制器既继承了PID控制无静态误差、静态稳定性好的特点，又继承了模糊控制兼容性强、动态性能好的特点。同时，它摆脱了他们的缺点。利用Matlab软件对超精密工作台控制系统进行了仿真实验。对PID控制和模糊PID控制进行了比较。仿真结果表明，模糊PID控制能达到较好的控制效果。这是一种有效的超精密工作台控制方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2009 International Workshop on Intelligent Systems and Applications

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