| Control systems in modern automatic engineering are nonlinear,time-changed and indefinite.lt isdifficult to model by traditional method,even sometime impossible.Under these circumstanceswe should apply model identification to gain the approximate model of object for effectivecontrol,there are many models to be chosen,fuzzy model is one of them,it is put forward with thedevelopment of fuzzy control.Fuzzy model has characteristics of general approximation andstrong nonlinear,it is fit for describing complex,nonlinear systems.To avoid rules expansion whenthe number of input values are very big.In this paper we apply hierarchical fuzzy model toresolve this problem,we also illustrate it has general approximation to any nonlinearsystems.Genetic Algorithm is a algorithm to help find the best parameters of process.lt hasabilities of global optimizing and implicit parallel,it can be generally used for all applications.Inour paper we use fuzzy model as predictive model and apply GA to identify fuzzy model(including hierarchical fuzzy model),we made experiments to nonlinear predictive systems andgot very good results.The paper contains chapters as below:Chapter 1 Preface. Simply illustrating the backgroud of the search topic controland work of this paper done.Chapter 2 Genetic Algorithm. Introducing ideological origination of GA,algorithm flowchart,component block in detail,reality in programmes and giving examples to verify.Chapter 3 Fuzzy model and its identification. definition,classification, Summarizing thestructure,general approximation and structure,approximation of hierarchical fuzzy model.Chapter 4 Application of Ga in fuzzy model identification.Explaining detailedly algorithmflow and realizing programmes of Ga in fuzzy model identification.Chapter 5 System Simulation. We did CAD simulation on our algorithm ideology fornonlinear predictive systems,we gave the detail explanation in each step and some differentexamples for comparing.Chapter 6 Conclusion. Summarizing the work we have done in this paper and the questionsstill not resolved in our paper,we also gave the simple analysis on these questions. |
