Artificial intelligence and fuzzy logic controller in a plc system computer science essay

One could argue that the best way is to ask an expert in the field where you are going to apply your fuzzy solution but those are not always available. With that said, fuzzy membership functions are used to describe the distribution of probabilities in real world for the variable you are trying to use in your fuzzy controller. That means you go out in the real world, you look at the system you are trying to control, you try your best to understand how it works and reacts to different outside changes and based on your findings you choose the shape that best fits. Or if you want you may call this process heuristic choice something like that, I do not like theory very much.

Artificial intelligence and fuzzy logic controller in a plc system computer science essay

Fuzzy Logic Explained Fuzzy logic for most of us: Fuzzy logic is a rule-based system that can rely on the practical experience of an operator, particularly useful to capture experienced operator knowledge.

Fuzzy logic is a form of artificial intelligence software; therefore, it would be considered a subset of AI.


Since it is performing a form of decision making, it can be loosely included as a member of the AI software toolkit. Fuzzy logic has been around since the mid s; however, it was not until the 70s that a practical application was demonstrated. Since that time the Japanese have traditionally been the largest producer of fuzzy logic applications.

Fuzzy logic has appeared in cameras, washing machines, and even in stock trading applications. In the last decade the United States has started to catch on to the use of fuzzy logic. There are many applications that use fuzzy logic, but fail to tell us of its use.

Fuzzy logic can be applied to non-engineering applications as illustrated in the stock trading application. It has also been used in medical diagnosis systems and in handwriting recognition applications. In fact a fuzzy logic system can be applied to almost any type of system that has inputs and outputs.

Fuzzy logic systems are well suited to nonlinear systems and systems that have multiple inputs and multiple outputs. Any reasonable number of inputs and outputs can be accommodated. Fuzzy logic also works well when the system cannot be modeled easily by conventional means.

Artificial intelligence and fuzzy logic controller in a plc system computer science essay

Many engineers are afraid to dive into fuzzy logic due to a lack of understanding. Fuzzy logic does not have to be hard to understand, even though the math behind it can be intimidating, especially to those of us who have not been in a math class for many years. Binary logic is either 1 or 0.

Fuzzy logic is a continuum of values between 0 and 1. The design of a fuzzy logic system starts with a set of membership functions for each input and a set for each output.

Artificial intelligence and fuzzy logic controller in a plc system computer science essay

Create a set of membership functions for each input. A membership function is simply a graphical representation of the fuzzy variable sets. We will then create a membership function for each of three sets of temperature as shown in the cold-normal-hot graphic, Figure 1.

A set of functions is created for each output set just as for the input sets. Figure 2 It should be noted that the shape of the membership functions do not need to be triangles as we have used in Figure 1 and Figure 2.

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Various shapes that can be used, such as Trapezoid, Gaussian, Sigmoid, or user definable. By changing the shape of the membership function, the user can tune the system to provide optimum response.

Now that we have our membership functions defined, we can create the rules that will define how the membership functions will be applied to the final system.Search and browse our historical collection to find news, notices of births, marriages and deaths, sports, comics, and much more.

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Gmail is email that's intuitive, efficient, and useful. 15 GB of storage, less spam, and mobile access. Download-Theses Mercredi 10 juin Part of the Lecture Notes in Computer Science book series (LNCS, volume ) Papers Table of Artificial Intelligence Conference, held in Linz, Austria, in June The focus of the conference was on "Fuzzy Logic in Artificial Intelligence".

The volume contains abstracts of two invited talks and full versions of 17 carefully selected.

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