鉱物処理プロセスにおける双線形濃度調節システムのファジィ制御

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This paper describes applicability of fuzzy control to a bilinear (nonlinear) concentration regulation system, which is typically found in mineral processing, focusing on nonlinearity and deadtime. These bring difficulties in realizing control systems. To express plant characteristics in linguistic form, at first, the authors have carried out a series of plant operating simulations. Consequently, the key features in designing a fuzzy control system are pointed out. The results are summarized as follows: 1. Nonlinearity (a) The concept of gain-scheduling is indispensable, because the process gain and the time constant (mean residence time) depend on equilibrim points. (b) In order to deal with inverse -response which can be found at times, special control rules should be designed. 2. Normalized deadtime L/T (ratio of apparent deadtime to time constant) (a) As a number of cells becomes larger or back-mixing ratio becomes smaller, the ratio L/T becomes larger, where control gain cannot be set large enough. (b) The fact that the magnitude of inverse-response is well characterized by the ratio L/T can be utilized in designing a control system. The authors have designed a fuzzy control system for the bilinear plant, taking accounts of the points mentioned above. The control rules of the obtained fuzzy controller has a structure satisfying the above features of the term “Nonlinearity.” And, the output gain is set suitable for L/T. The fuzzy controller is better than that of conventional PID controller in that the former is applicable to wider ranges of process variable changes. In addition, the fuzzy controller is applicable to various deadtime with one rule table, because distinct relation exists between normalized deadtime L/T and magnitude of inverse-response.
社団法人資源・素材学会の論文
1999-09-25

鉱物処理プロセスにおける双線形濃度調節システムのファジィ制御

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