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Centroid method
The process of defuzzification uses most commonly thecentroid
method to get the final result of a fuzzy logicalgorithm. The
centroid method is not the only method tosolve a fuzzy algorithm,
but it is the one we will use to control
the DC engine in this paper. The equation of this method is:
(1.1)
B. Steps to implement a fuzzy logic controller
System analysis
First of all, the programmer should learn everythingrelated of
the system to think in the solution. The designer isalways an
expert in the topic because is the one who will tellthe machine
what to do. Also, this person on charge should
share this information with the team in charge of the
projectbecause all the persons who work in this project should
reachthe same opinion about the solution logic.
Determination of the input/output variables
After the system sis analyzed, you have to define the inputand
out variables of the solution. Also, it is important to definethe
linguistic variables.
Determination of the discursion uni verse of each
variable
In this step it is determined the numeric range on
eachlinguistic variable. The numeric range is the minimum
andmaximum operation value that each variable will get.
Membership functions structuration
After defining the linguistic variables and universes foreach
one, it is time to elaborate the membership functions. Inthis step
it is determined the fuzzy groups, ranges and forms.
Establi shment of the Fuzzy rules and elaboration
of the Fuzzy Associative Memory (F AM )
Fuzzy rules are based in the experiences picked from thesystem.
Based on the input conditions it is assigned the outputbehavior.
After this step, the FAM is established to define thebehavior of
the system and the fuzzy controller.
Fuzzy Operations
The operations of union and intersection to obtain thefuzzy
value.
Defuzzif ication and denormalization
After proceeding with the previous steps, the centroid
method will obtain the final result.I
It is important to mention that usually a denormalizationshould
be applied to the output variable, to put it in a validrange.
II. WORK DEVELOPMENT AND ANALYSIS
III. CONCLUSIONES
IV. BIBLIOGRAFA
[1]ARNEZ. Enrique. Material del Curso Robtica eInteligencia
Artificial del Aula Virtual. Lima. UPC
[2]OSCANOA, Julio y TASAYCO, Pool. Lgica Difusa.Lima. UPC
