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To improve the performance of the PMSM, an ANN-Inversion based fractional order QFT(FOQFT) robust control scheme for the PMSM is proposed. Firstly, a BP neural network is used to approximate the inverse system of PMSM, and the composite pseudo-linear system, consisted of the ANN-Inversion system and the controlled PMSM system, is equivalent to a linear system with disturbance. Then, a FOQFT control...
This paper mainly studies the formal concept analysis in an intuitionistic fuzzy formal context. The primitive notions in concept lattice theory are extended to the intuitionistic fuzzy environment. According to this view, the notion of crisp-intuitionistic fuzzy concept is proposed which originates from an defined extent operator and an intent operator. Some basic properties are discussed. As a result,...
In this paper, the concept of random intuitionistic fuzzy sets is first introduced. Rough approximations of intuitionistic fuzzy sets in a random intuitionistic fuzzy approximation space is then defined and their properties are examined. Meanwhile, the notion of intuitionistic fuzzy probability measures is proposed. Several kinds of intuitionistic fuzzy probability measures induced by random intuitionistic...
In this paper, we investigate the topological structures of intuitionistic fuzzy rough sets. It is shown that an intuitionistic fuzzy rough approximation space can induce an intuitionistic fuzzy topological space if and only if the intuitionistic fuzzy relation in the approximation space is reflexive and transitive. The sufficient and necessary conditions that an intuitionistic fuzzy interior (closure,...
This paper first introduces a crisp classification relation based on an intuitionistic fuzzy set in a nonempty set. A covering for the universe of discourse is induced by this classification, and the connection between classification relation and the covering is discussed. Moreover, a pair of upper and lower approximations is defined according to the intuitionistic fuzzy classification, and some properties...
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