DEVELOPMENT OF THREE DEGREE OF FREEDOM CONTROLLER FOR SHELL AND TUBE HEAT EXCHANGER USING NON-DOMINATED SORTING GENETIC ALGORITHM II
DEVELOPMENT OF THREE DEGREE OF FREEDOM CONTROLLER FOR SHELL AND TUBE HEAT EXCHANGER USING NON-DOMINATED SORTING GENETIC ALGORITHM II
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Date
2020-02
Authors
MAGAJI, Hudu Katagum
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Abstract
This thesis presents the development of a Three Degree of Freedom (3DoF) based outlet fluid
temperature controller for Shell and Tube Heat Exchanger (STHX). Shell and Tube Heat
Exchangers are classes of heat exchangers being used in industries for heat transfer between
fluids. Tracking a setpoint by the STHX is usually a challenging problem, especially when
subjected to noise and disturbance. Addressing this challenge, an existing STHX experimental
data was employed to develop a three degree of freedom Proportional Integral Derivative (PID)
controller. The parameters of the controller were optimized using the Non-Dominated Sorting
Genetic Algorithm II (NSGA) while subjecting the system to noise. A Multi-objective
Optimization Problem (MOP) of setpoint tracking, disturbance rejection, and noise suppression
was formulated using Integral Absolute Error (IAE), Integral of Squared Error (ISE), and
Integral of Time-weighted Absolute Error (ITAE) as cost function. Simulations were performed
using MATLAB/SIMULINK R2018a. From the obtained results, the percentage overshoot under
IAE using 3DoF controller, were slightly higher than that of 2DoF controller in setpoint tracking,
the trend was reversed under the ISE criterion. The research found that the flow and temperature
disturbance responses were optimally reduced to the range of 90% to 99% in all three criterions
as compared to 2DoF controller which was in the range of 25% to 78%. The results also proved
great suppression of noise with the developed 3DoF controller.
Description
A DISSERTATIONSUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES
AHMADU BELLO UNIVERSITY
IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF A
MASTER OF SCIENCE (MSc) DEGREE IN CONTROL ENGINEERING
DEPARTMENT OFCOMPUTER ENGINEERING
FACULTY OF ENGINEERING
AHMADU BELLO UNIVERSITY,
ZARIA, NIGERIA
Keywords
DEVELOPMENT,, DEGREE,, FREEDOM CONTROLLER,, SHELL,, TUBE HEAT EXCHANGER,, NON-DOMINATED SORTING GENETIC ALGORITHM II,