Water Level Control Essay
ABSTRACT: Water level control is highly important due to its applications in domestic areas (E.g.: overhead tank) and industrial areas (E.g.: Petrochemical industries). This project’s main purpose is to design and simulate the water level controller using Fuzzy Logic in MATLAB. In our project, Fuzzy logic controller is based on MAMDANI type inference system and the design was implemented using Fuzzy logic toolbox and Simulink. Fuzzy logic controller has two inputs i.e. level and rate of change of error and one output i.e. valve position. During analysis, the controller was simulated using rules specified in the rule editor of Fuzzy logic toolbox. This method is used analyse the behaviour of the tank system and also …show more content…
2) Controller’s performance is not efficient. To overcome these drawbacks, water level controller using Fuzzy logic in MATLAB is used. DESIGN APPROACH: The system consists of tank, valve, fuzzy logic controller, input i.e., level and rate and output i.e., valve (percentage of opening of the valve). The tank is modelled using Simulink and it consists of input and output pipes for the inflow and outflow of water (or liquid). The outflow rate is dependent on the diameter of the output pipe which is usually constant and pressure which depends on the level of water. Therefore, we have to maintain a desired set-point value to ensure the proper functioning of the tank system. Fig 2.1: Block diagram for Design approach 3.1: The Water Tank Level Control System. Referring to the fig 3.1, the input to the system (usually square wave) is generated from the signal generator block. This signal is added to the block containing constant value one using the sum blocks. This makes the signal cycle about one position and this signal acts as a level input which is a desired value and the error signal i.e., the difference between the desired value and the actual value is given to the multiplexer
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