Download e-book for iPad: Design of analog fuzzy logic controllers in CMOS by Carlos Dualibe

By Carlos Dualibe

ISBN-10: 030648014X

ISBN-13: 9780306480140

ISBN-10: 1402073593

ISBN-13: 9781402073595

Fuzzy common sense is a computational paradigm in a position to modelling the personal uncertainness of people. This wide-ranging e-book focuses in-depth at the VLSI CMOS implementation and alertness of programmable analogue Fuzzy good judgment Controllers following a mixed-signal philosophy.

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Download e-book for iPad: Design of analog fuzzy logic controllers in CMOS by Carlos Dualibe

Fuzzy good judgment is a computational paradigm able to modelling the personal uncertainness of humans. This wide-ranging booklet focuses in-depth at the VLSI CMOS implementation and alertness of programmable analogue Fuzzy good judgment Controllers following a mixed-signal philosophy.

Additional info for Design of analog fuzzy logic controllers in CMOS technologies : implementation, test, and application

Example text

Fuzzy Logic and Fuzzy Systems 23 S, the rule says that power must be equal to the fuzzy set L. However, to what extend does the actual "inferred" output of the rule differ from L when the actual input differs from S? To solve this problem, the "meaning" of the rule is evaluated by using the so-called fuzzy implication (fuzzy inference), which can be stated as: Premise (actual input): distance is "do". Rule: If distance is S (small) then power is L (low). Consequence (inferred output): power is L*; where L* is the modified consequent fuzzy set different from the original L.

On the other hand, since the rules are connected by "or" operators it turns out that the final output inferred by the whole set of rules will be the union of the individual clipped fuzzy set inferred by each rule. Thus: The latter operation is also called aggregation. In the latter expression, C is the aggregated fuzzy set at the output of the controller whereas Ck* is the clipped output fuzzy set at the k-th rule. Using the "max" operator as S-Norm (or T-CoNorm) for the connectives "or" and the clipping operator "min", the membership function of C can be calculated as: For a given crisp 2-input value (x,y)=(xo,yo), the final fuzzy set inferred by the whole set of rules is the aggregation (union) of all clipped fuzzy set of each rule.

In contrast, the consequent part is described by a linear combination of the actual, non fuzzy, inputs of the controller. an are crisp real constant values. xn refer to the numerical base variables rather to the equally named linguistic variables. The controller defined in terms of Takagi-Sugeno’s rules performs approximations by interpolating the hyperplanes represented by the linear expressions at the consequent parts of each rule. When, with the exception of ao, all coefficients in the linear output expressions are identically zero, the controller is called "Zero-Order" or "Singleton" Takagi-Sugeno’s controller.

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Design of analog fuzzy logic controllers in CMOS technologies : implementation, test, and application by Carlos Dualibe


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