Fuzzy pid based Temperature Control of Electric Furnace for Glass Tempering Process


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3.2.5 Simulink model of overall system 
Figure 3. 12 Over all Simulink model of fuzzy pid and pid controller
Figure 3. 13 Model components under fuzzy pid block 


Fuzzy PID Based Temperature Control of Electric Furnace for Glass Tempering Process
M.Sc. Thesis, Addis Ababa University, December 2016 
53 
Figure 3. 14 PID controller block model components under fuzzy pid block 


Fuzzy PID Based Temperature Control of Electric Furnace for Glass Tempering Process
M.Sc. Thesis, Addis Ababa University, December 2016 
54 
CHAPTER FOUR
 

SIMULATION RESULTS AND DISCUSSIONS
 
The electric furnace temperature control for glass tempering was modeled, deigned and 
analyzed in the materials and methods section of this thesis. This chapter deals with the results 
and discussion of MATLAB simulations. It is concerned with the simulation results of the closed 
loop control of the system using Fuzzy-PID and PID with MATLAB/SIMULINK. The simulation 
is analyzed by step response, disturbance rejection and parameter variation (robustness) of the 
closed loop system. SIMULINK® is a toolbox extension of the MATLAB program. It is a program 
for simulating dynamic systems. Simulink has the advantages of being capable of complex 
dynamic system simulations, graphical environment with visual real time programming and 
broad selection of tool boxes. Its graphical interface allows selection of functional blocks, their 
placement on a worksheet, selection of their functional parameters interactively, and 
description of signal flow by connecting their data lines. Simulink simulates analogue systems 
and discrete digital systems. 
The Simulink model shown in Figure 3.13 is used to carry out simulation studies and analyze 
the performance of the controllers under different operating conditions. 

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