By Gang Feng

Fuzzy common sense keep watch over (FLC) has confirmed to be a favored keep watch over method for lots of complicated platforms in undefined, and is frequently used with nice luck instead to standard keep an eye on suggestions. besides the fact that, since it is essentially version unfastened, traditional FLC suffers from an absence of instruments for systematic balance research and controller layout. to deal with this challenge, many model-based fuzzy regulate ways were built, with the bushy dynamic version or the Takagi and Sugeno (T–S) fuzzy model-based ways receiving the best awareness.

Analysis and Synthesis of Fuzzy keep an eye on platforms: A Model-Based Approach deals a different reference dedicated to the systematic research and synthesis of model-based fuzzy regulate structures. After giving a short evaluation of the forms of FLC, together with the T–S fuzzy model-based regulate, it absolutely explains the basic thoughts of fuzzy units, fuzzy common sense, and fuzzy structures. this permits the ebook to be self-contained and gives a foundation for later chapters, which cover:

  • T–S fuzzy modeling and identity through nonlinear versions or information
  • Stability research of T–S fuzzy platforms
  • Stabilization controller synthesis in addition to powerful H∞ and observer and output suggestions controller synthesis
  • Robust controller synthesis of doubtful T–S fuzzy systems
  • Time-delay T–S fuzzy structures
  • Fuzzy version predictive regulate
  • Robust fuzzy filtering
  • Adaptive regulate of T–S fuzzy platforms

A reference for scientists and engineers in platforms and keep an eye on, the e-book additionally serves the desires of graduate scholars exploring fuzzy common sense keep an eye on. It effectively demonstrates that traditional keep watch over expertise and fuzzy common sense regulate could be elegantly mixed and additional built in order that negative aspects of traditional FLC should be refrained from and the horizon of traditional keep an eye on expertise drastically prolonged. Many chapters characteristic software simulation examples and functional numerical examples in accordance with MATLAB®.

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Extra resources for Analysis and Synthesis of Fuzzy Control Systems: A Model-Based Approach

Sample text

Using fuzzy clustering algorithms, one can obtain the number of rules and the centers and decay factors of the membership functions at the same time. The following fuzzy dynamic clustering algorithm was proposed in Cao, Rees, and Feng (1997a), and is suitable for taking into account dynamic behavior of the local dynamic models. At first suppose the number of rules is fixed; that is, the number m is fixed. 41) where N is the sampling points of the time, m is the number of rules, z = [ z1 z2  zm ] is an m-tuple of mean prototypes, || z (t ) − zl || is the distance of the feature point z(t) to the mean prototype zl , yˆ (t ) = ϕ (t − 1)T α l , l = 1, 2, , m are the m predicting equations of the local linear models called the equation prototypes, ω is used to control the shape of the membership functions, and w1 and w2 are the weighting factors.

Similar to ordinary sets, the operations of complement, union, and intersection can also be defined for fuzzy sets. 10 (Complement of a Fuzzy Set) The complement of a fuzzy set A is denoted by A, whose membership function is defined as µ A ( x ) = 1 − µ A ( x ). 15) µ C ( x ) = µ A ( x ) ∨ µ B ( x ). 17) µ C ( x ) = µ A ( x ) ∧ µ B ( x ). 3 As pointed out by Zadeh (1965), a more intuitive and appealing definition of the union of fuzzy sets A and B is the smallest fuzzy set containing both A and B.

15 (Sup-Min Composition) Let R1(x, y), (x, y) ∈ X × Y and R2(y, z), (y, z) ∈ Y × Z be two fuzzy relations. 25) where (x, z) ∈ X × Z. 16 (Sup-Product Composition) Let R1(x, y), (x, y) ∈ X × Y and R2(y, z), (y, z) ∈ Y × Z be two fuzzy relations. 26) where (x, z) ∈ X × Z. After introduction of fuzzy relations, fuzzy rules can be described as follows. 27) where A and B are fuzzy sets often of linguistic values on universes of discourse X and Y, respectively. The IF-part “x is A” is normally called the antecedent or premise and the THEN-part “y is B” is normally called the consequence or conclusion.

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