| The traditional optimization tries to find out the optimal solution in optimization problems. Due to the large quantity of complex elements in the practical situation, it is difficult for us to find an accurate math model to describe the corresponding cases, and may be that there is no optimal solution in traditional concept. In such cases, a popular strategy is to choose a "satisfactory solution" instead of the "optimal solution".This paper introduces the basic method of satisfactory optimization, which consist of the procedure diagram, satisfaction, the basic definition of satisfaction and satisfactory solution, the forms of satisfactory function. Then by analyzing the form of the synthesis satisfactory rate function, we present the multi-criterion satisfactory optimization model,based upon fairness doctrine. In this model, the achieve of optimization of parameters by the optimization of comprehensive satisfaction evaluation function of performance indexes. Finally, after the brief introduction the operation flow chart and computing method of genetic algorithms, we analysis the superiority of it on solve optimization problems, and combine it with the multi-criterion satisfactory optimization. This paper is divided into four parts to discussion the problem of the multimode PID, which is hardly be optimized by the classical control theory discuss model multi-objective optimization of satisfaction, in control system design optimization using MATLAB language to model.Discusses the satisfactory optimization applied in fuzzy logic controller design. We tried to use the multi-criterion satisfactory optimization model to optimize the parameters and the structure of the FLC at the same time.The ideal simulation results have been given for several different systems. |
