Fuzzy Controller
Fuzzy Controller
Fuzzy Controller
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<strong>Fuzzy</strong> Rule-Base<br />
‣ It is the collection of fuzzy IF-THEN rules in which the<br />
preconditions and consequences are linguistic terms<br />
‣ <strong>Fuzzy</strong> rules relate inputs to outputs (control logic)<br />
‣ Rules are formed using linguistic variables, so it is not<br />
precise<br />
‣ Output is also a linguistic value representing a fuzzy set<br />
‣ Determine degree of match of fuzzy input with rule<br />
antecedent and assign this to the rule conclusion<br />
‣ Antecedent is the intersection or union of fuzzy inputs<br />
‣ It is also called the degree of truth<br />
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<strong>Fuzzy</strong> Rule-Base<br />
Example<br />
‣ Assume two fuzzy linguistic variables Speed and Position<br />
‣ Speed (fast, 0.65 and Medium , 0.35)<br />
‣ Position (centered, 0.4 and right , 0.6)<br />
‣ Find the membership for the conclusion of the rules:<br />
If Speed = Fast and Position = Centered<br />
then Change in speed = Faster<br />
If Speed = Fast and Position = Right<br />
then Change in speed = Zero<br />
If Speed = Medium and Position = Centered<br />
then Change in speed = Faster<br />
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