PH Control Technique using Fuzzy Logic full report
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 smart paper boy Active In SP Posts: 2,053 Joined: Jun 2011 16-07-2011, 04:03 PM Presented by: Mohit Ghawari   pH control technique using fuzzy.ppt (Size: 2.26 MB / Downloads: 196) Fuzzy Logic Fuzzy logic is a form of many-valued logic. It can accept values from 0 to 1. IF variable IS property THEN action. Fuzzy logic and probabilistic logic are mathematically similar. Fuzzy logic corresponds to "degrees of truth", while probabilistic logic corresponds to "probability, likelihood". Fuzzy Controller Different Sections of Fuzzy controller Fuzzification Section Rule Base Inference Mechanism Defuzzification Section pH It is negative of the logarithm of the hydrogen ion concentration, to the base 10. I.e., PH= -log 10 [H+] It varies from 1 to 14, “1” being most acidic and “14” being most alkaline, and “7” being neutral. pH paper can be used to indicate the pH value of the substance. pH Control System pH controller using fuzzy logic pH controllers are widely used in Sugar Industries. Raw sugarcane juice has approx. “5” pH value and it should be “7”. This process is done by adding lime juice and passing sulphur dioxide gas. Fuzzication Section “PH” and “LFPD” are the input variables. Find the numerical values of the membership function defined for that variable. This value can be used by the inference mechanism to trigger the rules in the rule base. The set point for the process is normally 7. After Fuzzication Membership function of pH Membership function of LPFD Rule Base Rule base stores the different rules that are to be used according to the input. These rules are either gathered from experienced human operator or from careful study of existing pH control systems. Inference Mechanism The inference mechanism employed in pH control is based on individual rule firing. Each rule is evaluated and overall decision is derived. Output from this unit is given a degree of satisfaction. Membership punction choosen here is symmetric. Defuzzication Mechanism The inference mechanism employed in pH control is based on individual rule firing. In this scheme, contribution of each rule is evaluated and overall decision is derived. Sugar Industries Without Automatic pH Control Manually it can be done in two ways: In first method, the flow of SO2 is stopped and lime juice controls the pH value. It provides an accuracy of 6.9 to 7.2 In second method, lime juice is added to heated raw juice until its pH reaches 10 and then SO2 is passed. It provides an accuracy of 6.9 to 7.1. pH is observed using pH indicator paper. Sugar Industries With Automatic pH Control To implement this controller many methods can be adopted. It may be implemented using a PC, a microprocessor, or a microcontroller. In PC, program can be written in high level language(like “c”) but in microprocessor if “c” language is used then an external compiler is to be used. Else assembly language can be used. Using a Microcontroller Microcontroller of PIC series is used. PIC 16f73 microcontroller chip is used. In addition, we are using an USART, input buffer, output latches, LCD Display. Hardware Block Diagram Merits and De-merits The method of using rule base is more lucid and natural to people. Fussy logic methods can be used for tuning of conventional PID controllers. Since the fuzzy controllers have no mathematical model, it is difficult to analyse the system. The working of the controller heavily depends on the judgement of the human expert who formulated the rules.
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 mhammad abuzour Active In SP Posts: 1 Joined: Mar 2012 15-03-2012, 11:32 PM hello please , there is any body can help me in my report
 seminar paper Active In SP Posts: 6,455 Joined: Feb 2012 16-03-2012, 10:23 AM to get information about the topic "PH Control Technique using Fuzzy Logic" full report ppt and related topic refer the link bellow http://topicideas.org/how-to-ph-control-...ull-report http://topicideas.org/how-to-ph-control-...uzzy-logic
 Guest Thinking To Register 28-08-2012, 04:30 PM Sir, i need the complete explanation and block diagram of this paper

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