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Case Study - Coupled Tanks Table of Contents 1.0 Introduction 3 2.0 Background of the Project 3 3.0 System Modelling & Verification 3 3.1 Theoretical modelling 3
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Submitted by samchristo on March 29, 2008
Category: Technology
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Table of Contents
1.0 Introduction 3
2.0 Background of the Project 3
3.0 System Modelling & Verification 3
3.1 Theoretical modelling 3
3.2 System Modelling 5
3.3 Calibration of transducers 5
3.4 System identification and parameter determination 5
3.5 Model verification 5
4.0 Controller Design 5
4.1 Design of analogue controller 5
4.2 Design of digital controller 5
4.3 Design of state variable feedback controller 5
5.0 Controller Implementation 5
5.1 Building of analogue controller 5
5.2 Implementation of digital controller 5
5.3 Implementation of state-variable feedback observer/controller 5
6.0 Results 5
6.1 Comparison of actual results against predicted results 5
6.2 Discrepancies 5
7.0 Conclusions and future directions 5
1.0 Introduction
2.0 Background of the Project
The Control of liquid level between tanks is a basic problem in the process industries requires liquids to be pumped and stored in tanks. The level of the fluid in the tanks must always be controlled and the flow between tanks must be regulated. A common situation in the chemical industry is two or more tanks containing various reactants connected by pipes which can be represented by our coupled tank system project.
3.0 System Modelling & Verification
3.1 Theoretical modelling
The system model is determined by relating the flow Qi into the tank to the flow Qo leaving through the Valve at the bottom. Firstly for a single tank, using a balance of flows equation on the tank, it is possible to write:
Where, A is the cross-sectional area of the tank, and H is the height of the fluid in the tank.
At a certain operating point, the system can be linearised to:
From this we can find the open loop transfer function to...
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