【正文】 Single watertank system Now day in Inhabitant domestic water supply, beverages, food processing and other industries the production process, we usually need to use the water tank, it need to 12 / 97 maintain the appropriate level, neither too overflow cause waste, also cannot too little and can39。s life and industrial production, and many other areas often involve liquid level and flow control problem, for example in Inhabitant domestic water supply, beverages, food processing and other industries the production process, we usually need to use the water tank, it need to maintain the appropriate level, neither too overflow cause waste, also cannot too little and can39。 percent overshoot, %OS。C decreasing linearly to 50% at 40176。C to +45176。 e) Simulate various control strategies (., PI, PID control, optimal control, adaptive control, fuzzy control) on the NetCon System for realtime closeloop level control, based on the model of a water tank。t meet the demand. So the liquid height is an important parameter of the industrial process control, especially in a dynamic state. By using suitable methods to detect the liquid level can control it can receive good effect. In this final project design, I duty is to design a water tank liquid level control system, which involves the dynamic liquid level control, the modeling of the control system, PID parameters setting. I will discuss using different control methods to achieve control require, for instance, Proportional controller, PI controller. I will discuss both design processes and test results in this paper. What more I will introduce some main software which includes MATLAB, SIMULINK, and NetCon Systems. Key words: position control, PI controller, PID parameters setting, software 5 / 97 Acknowledgement First of all, I want appreciate my first supervisor and second supervisor. I could not achieve my project without their help. Especially professor Guoping Liu, he gives me great support. When some questions really confuse me, he always fills of patient and answer for me. He encourages me and teaches me how to solve the problems. He not only teaches me knowledge but also creative my ability of research the essential of the problem. No matter in the theoretical knowledge and practical test. Secondly I want to appreciate the University of Glaman. They give me opportunity to learn the theory with the real application. Thirdly I want to say thanks to Beijing University of Civil Engineering and Architecture where I used to study. They gave me the chance to study in the University of Glaman now. I want to appreciate my teacher in china, especially professor Zhijian Jiang. At last I want to say thank to any people who support me. Especially thanks to my parents and my friends. All of you are very important for me and I really appreciate the help that you gave me in this whole year. 6 / 97 content Abstract ........................................................................................................................... 4 Acknowledgement .......................................................................................................... 5 content ............................................................................................................................. 6 Figure list ........................................................................................................................ 9 Chapter1. Project Overview ......................................................................................... 11 Aim and Objectives:........................................................................................ 11 General Background:........................................................................................... 11 Single watertank system .............................................................................. 11 Couple watertank system ............................................................................ 12 Chapter2. Software Introduction .................................................................................. 14 MATLAB Introduction ....................................................................................... 14 Simulink introduction .......................................................................................... 16 NetCon System .................................................................................................... 17 ................................................................................................... 18 NetConTop ................................................................................................... 19 Chapter3. Hardware Introduction ................................................................................ 20 Coupledtank system description ........................................................................ 20 Component nomenclature.................................................................................... 21 ponent description ........................................................................................ 22 Overall frame and water tanks ...................................................................... 22 Pump ............................................................................................................. 22 Pressure sensor ............................................................................................. 22 Coupledtank model parameters .......................................................................... 22 Chapter4. Theory and mathematical model.................................................................. 25 Mathematical model ............................................................................................ 25 model of the upper water