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APPLICATION OF FUZZY
LOGIC
WHAT IS FUZZY LOGIC?
 Fuzzy Logic (FL) is a method of reasoning that
resembles human reasoning. The approach of FL
imitates the way of decision making in humans that
involves all intermediate possibilities between digital
values YES and NO.
 The conventional logic block that a computer can
understand takes precise input and produces a
definite output as TRUE or FALSE, which is
equivalent to human’s YES or NO.
What is Fuzzy Logic?
Fuzzy logic is a form of many-valued logic; it deals
with reasoning that is approximate rather than fixed
and exact. In contrast with traditional logic theory,
where binary sets have two-valued logic: true or false,
fuzzy logic variables may have a truth value that
ranges in degree
between 0 and 1
What is Fuzzy Logic?
Fuzzy logic has been extended to handle the concept of
partial truth, where the truth value may range
between completely true and completely
false. Furthermore, when linguistic variables are
used, these degrees may be managed by specific
functions.
Fuzzy Logic began
Fuzzy logic began with the 1965 proposal
of fuzzy set theory by Lotfi Zadeh Fuzzy logic
has been applied to many fields, from control
theory to artificial intelligence
Lotfi A. Zadeh, a professor of UC Berkeley in California,
soon to be known as the founder of fuzzy logic observed that
conventional computer logic was incapable of manipulating
data representing subjective or vague human ideas such as "an
attractive person" .
 Fuzzy logic, hence was designed to allow computers to
determine the distinctions among data with shades of gray,
similar to the process of human reasoning.
 This theory proposed making the membership function (or
the values False and True) operate over the range of real
numbers [0.0, 1.0]. Fuzzy logic was now introduced to the
world.
Some Related Fields
Fuzzy
Logic &
Fuzzy Set
Theory
Evidence
Theory
Pattern
Recognition
& Image
Processing
Control
Theory
Knowledge
Engineering
Rules :-
 Fuzzy logic usually uses IF-THEN rules, or
constructs that
are equivalent.
-IF variable IS property THEN action
Example:-
A simple temperature regulator that uses a fan might
look like this:
IF temperature IS very cold THEN stop fan
IF temperature IS cold THEN turn down fan
IF temperature IS normal THEN maintain level
IF temperature IS hot THEN speed up fan
FUZZY LOGIC IN CONTROL SYSTEMS
 Fuzzy Logic provides a more efficient and
resourceful way to solve Control Systems.
 Some Examples
 Temperature Controller
 Anti – Lock Break System ( ABS )
TEMPERATURE CONTROLLER
 The problem
 Change the speed of a heater fan, based off the room
temperature and humidity.
 A temperature control system has four settings
 Cold, Cool, Warm, and Hot
 Humidity can be defined by:
 Low, Medium, and High
 Using this we can define
the fuzzy set.
Fuzzy Logic in a Washing Machine
 Fuzzy logic washing machines are gaining popularity. These machines
offer the advantages of performance, productivity, simplicity,
productivity, and less cost. Sensors continually monitor varying
conditions inside the machine and accordingly adjust operations for
the best wash results. As there is no standard for fuzzy logic, different
machines perform in different manners.
 Fuzzy logic controls the washing process, water intake, water
temperature, wash time, rinse performance, and spin speed. This
optimizes the life span of the washing machine.
 Machines even learn from past experience, memorizing programs
and adjusting them to minimize running costs.
 Most fuzzy logic machines feature ‘one touch control’. Equipped with
energy saving features .
The fuzzy logic checks for the extent of dirt and grease, the amount of soap
and water to add, direction of spin, and so on.
 The machine rebalances washing load to ensure correct spinning. Else, it
reduces spinning speed if an imbalance is detected. Even distribution of
washing load reduces spinning noise. Neurofuzzy logic incorporates
optical sensors to sense the dirt in water and a fabric sensor to detect the
type of fabric and accordingly adjust wash cycle.
Air Conditioner
Block diagram for Controller :-
Fuzzy Logic Applications
“If all motion vectors are almost parallel and their time differential
is small, then the hand jittering is detected and the direction of the
hand movement is in the direction of the moving vectors”.
Image Stabilization via Fuzzy Logic
Fuzzy Logic Applications
 Aerospace
 Altitude control of spacecraft, satellite altitude control,
flow and mixture regulation in aircraft deiceing vehicles.
 Automotive
 Trainable fuzzy systems for idle speed control, shift
scheduling method for automatic transmission,
intelligent highway systems, traffic control, improving
efficiency of automatic transmissions
Fuzzy Logic Applications
 Business
 Decision-making support systems, personnel evaluation
in a large company
 Chemical Industry
 Control of pH, drying, chemical distillation processes,
polymer extrusion production, a coke oven gas cooling
plant
Fuzzy Logic Applications
 Defense
 Underwater target recognition, automatic target
recognition of thermal infrared images, naval decision
support aids, control of a hypervelocity interceptor, fuzzy
set modeling of NATO decision making.
 Electronics
 Control of automatic exposure in video cameras,
humidity in a clean room, air conditioning systems,
washing machine timing, microwave ovens, vacuum
cleaners.
Fuzzy Logic Applications
 Financial
 Banknote transfer control, fund management, stock
market predictions.
 Industrial
 Cement kiln controls heat exchanger control, activated
sludge wastewater treatment process control, water
purification plant control, quantitative pattern analysis
for industrial quality assurance, control of constraint
satisfaction problems in structural design, control of
water purification plants
Fuzzy Logic Applications
 Manufacturing
 Optimization of cheese production.
 Marine
 Autopilot for ships, optimal route selection, control
of autonomous underwater vehicles, ship steering.
 Medical
 Medical diagnostic support system, control of
arterial pressure during anesthesia, multivariable
control of anesthesia, modeling of
neuropathological findings in Alzheimer's patients,
radiology diagnoses, fuzzy inference diagnosis of
diabetes and prostate cancer.
Fuzzy Logic Applications
 Mining and Metal Processing
 Sinter plant control, decision making in metal forming.
 Robotics
 Fuzzy control for flexible-link manipulators, robot arm
control.
 Securities
 Decision systems for securities trading.
Fuzzy Logic Applications
 Signal Processing and Telecommunications
 Adaptive filter for nonlinear channel equalization control
of broadband noise
 Transportation
 Automatic underground train operation, train schedule
control, railway acceleration, braking, and stopping

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Application of fuzzy logic

  • 2. WHAT IS FUZZY LOGIC?  Fuzzy Logic (FL) is a method of reasoning that resembles human reasoning. The approach of FL imitates the way of decision making in humans that involves all intermediate possibilities between digital values YES and NO.  The conventional logic block that a computer can understand takes precise input and produces a definite output as TRUE or FALSE, which is equivalent to human’s YES or NO.
  • 3. What is Fuzzy Logic? Fuzzy logic is a form of many-valued logic; it deals with reasoning that is approximate rather than fixed and exact. In contrast with traditional logic theory, where binary sets have two-valued logic: true or false, fuzzy logic variables may have a truth value that ranges in degree between 0 and 1
  • 4. What is Fuzzy Logic? Fuzzy logic has been extended to handle the concept of partial truth, where the truth value may range between completely true and completely false. Furthermore, when linguistic variables are used, these degrees may be managed by specific functions.
  • 5. Fuzzy Logic began Fuzzy logic began with the 1965 proposal of fuzzy set theory by Lotfi Zadeh Fuzzy logic has been applied to many fields, from control theory to artificial intelligence
  • 6. Lotfi A. Zadeh, a professor of UC Berkeley in California, soon to be known as the founder of fuzzy logic observed that conventional computer logic was incapable of manipulating data representing subjective or vague human ideas such as "an attractive person" .  Fuzzy logic, hence was designed to allow computers to determine the distinctions among data with shades of gray, similar to the process of human reasoning.  This theory proposed making the membership function (or the values False and True) operate over the range of real numbers [0.0, 1.0]. Fuzzy logic was now introduced to the world.
  • 7. Some Related Fields Fuzzy Logic & Fuzzy Set Theory Evidence Theory Pattern Recognition & Image Processing Control Theory Knowledge Engineering
  • 8. Rules :-  Fuzzy logic usually uses IF-THEN rules, or constructs that are equivalent. -IF variable IS property THEN action Example:- A simple temperature regulator that uses a fan might look like this: IF temperature IS very cold THEN stop fan IF temperature IS cold THEN turn down fan IF temperature IS normal THEN maintain level IF temperature IS hot THEN speed up fan
  • 9. FUZZY LOGIC IN CONTROL SYSTEMS  Fuzzy Logic provides a more efficient and resourceful way to solve Control Systems.  Some Examples  Temperature Controller  Anti – Lock Break System ( ABS )
  • 10. TEMPERATURE CONTROLLER  The problem  Change the speed of a heater fan, based off the room temperature and humidity.  A temperature control system has four settings  Cold, Cool, Warm, and Hot  Humidity can be defined by:  Low, Medium, and High  Using this we can define the fuzzy set.
  • 11. Fuzzy Logic in a Washing Machine  Fuzzy logic washing machines are gaining popularity. These machines offer the advantages of performance, productivity, simplicity, productivity, and less cost. Sensors continually monitor varying conditions inside the machine and accordingly adjust operations for the best wash results. As there is no standard for fuzzy logic, different machines perform in different manners.
  • 12.  Fuzzy logic controls the washing process, water intake, water temperature, wash time, rinse performance, and spin speed. This optimizes the life span of the washing machine.  Machines even learn from past experience, memorizing programs and adjusting them to minimize running costs.  Most fuzzy logic machines feature ‘one touch control’. Equipped with energy saving features . The fuzzy logic checks for the extent of dirt and grease, the amount of soap and water to add, direction of spin, and so on.  The machine rebalances washing load to ensure correct spinning. Else, it reduces spinning speed if an imbalance is detected. Even distribution of washing load reduces spinning noise. Neurofuzzy logic incorporates optical sensors to sense the dirt in water and a fabric sensor to detect the type of fabric and accordingly adjust wash cycle.
  • 14. Block diagram for Controller :-
  • 15. Fuzzy Logic Applications “If all motion vectors are almost parallel and their time differential is small, then the hand jittering is detected and the direction of the hand movement is in the direction of the moving vectors”. Image Stabilization via Fuzzy Logic
  • 16. Fuzzy Logic Applications  Aerospace  Altitude control of spacecraft, satellite altitude control, flow and mixture regulation in aircraft deiceing vehicles.  Automotive  Trainable fuzzy systems for idle speed control, shift scheduling method for automatic transmission, intelligent highway systems, traffic control, improving efficiency of automatic transmissions
  • 17. Fuzzy Logic Applications  Business  Decision-making support systems, personnel evaluation in a large company  Chemical Industry  Control of pH, drying, chemical distillation processes, polymer extrusion production, a coke oven gas cooling plant
  • 18. Fuzzy Logic Applications  Defense  Underwater target recognition, automatic target recognition of thermal infrared images, naval decision support aids, control of a hypervelocity interceptor, fuzzy set modeling of NATO decision making.  Electronics  Control of automatic exposure in video cameras, humidity in a clean room, air conditioning systems, washing machine timing, microwave ovens, vacuum cleaners.
  • 19. Fuzzy Logic Applications  Financial  Banknote transfer control, fund management, stock market predictions.  Industrial  Cement kiln controls heat exchanger control, activated sludge wastewater treatment process control, water purification plant control, quantitative pattern analysis for industrial quality assurance, control of constraint satisfaction problems in structural design, control of water purification plants
  • 20. Fuzzy Logic Applications  Manufacturing  Optimization of cheese production.  Marine  Autopilot for ships, optimal route selection, control of autonomous underwater vehicles, ship steering.  Medical  Medical diagnostic support system, control of arterial pressure during anesthesia, multivariable control of anesthesia, modeling of neuropathological findings in Alzheimer's patients, radiology diagnoses, fuzzy inference diagnosis of diabetes and prostate cancer.
  • 21. Fuzzy Logic Applications  Mining and Metal Processing  Sinter plant control, decision making in metal forming.  Robotics  Fuzzy control for flexible-link manipulators, robot arm control.  Securities  Decision systems for securities trading.
  • 22. Fuzzy Logic Applications  Signal Processing and Telecommunications  Adaptive filter for nonlinear channel equalization control of broadband noise  Transportation  Automatic underground train operation, train schedule control, railway acceleration, braking, and stopping