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MODEL SET IDENTIFICATION IN FREQUENCY‐DOMAIN AND ITS APPLICATION TO JOINT DESIGN WITH ROBUST CONTROL
Author(s) -
Fukushima Hiroaki,
Sugie Toshiharu
Publication year - 1999
Publication title -
asian journal of control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.769
H-Index - 53
eISSN - 1934-6093
pISSN - 1561-8625
DOI - 10.1111/j.1934-6093.1999.tb00008.x
Subject(s) - weighting , identification (biology) , noise (video) , frequency domain , bounded function , system identification , set (abstract data type) , control theory (sociology) , mathematical optimization , computer science , function (biology) , convex optimization , algorithm , mathematics , regular polygon , data modeling , control (management) , artificial intelligence , medicine , mathematical analysis , botany , radiology , database , evolutionary biology , image (mathematics) , computer vision , biology , programming language , geometry
In this paper, we propose a new model set identification method for robust control, which determines both nominal models and uncertainty bounds in frequency‐domain using periodgrams obtained from experimental data. This method also gives less conservative model sets when we have more experimental data, which is one of the distinguished features compared with the existing model set identification methods. To this end, first, we construct a new noise model set in terms of periodgrams, which consists of hard‐bounded (or deterministic) noises but takes account of a low correlation property of noise signals, simultaneously. Then, based on the noise model, we show how to compute the nominal models and the upper bounds of modeling error via convex optimization, which minimize given cost functions. Furthermore, by introducing a weighting function compatible with control performance criterion into the identification cost function, we consider a joint design method of the proposed model set identification and H ∞ control. Numerical examples show the effectiveness of the proposed method.