Modelling and Control of an Extruder Cooling System
(2021)Department of Automatic Control
- Abstract
- The thesis aims to develop knowledge of the physics and thermodynamics behind a nonlinearity in an air cooling system for an plastic extruder machine. To accomplish this, both nonlinear and linearized models were set up in Matlab and Simulink environments based on the laws of physics and thermodynamics. Simulations were run to achieve and analyze step responses, and different PI control structures were simulated and discussed. The dynamics of the centrifugal fan were pointed out as the primary reasons for the nonlinearity. Finally, different options and alternatives, both mechanical and software based, to compensate for the nonlinearity were presented.
Due to Covid-19, it was not possible to perform any tests on real hardware which was... (More) - The thesis aims to develop knowledge of the physics and thermodynamics behind a nonlinearity in an air cooling system for an plastic extruder machine. To accomplish this, both nonlinear and linearized models were set up in Matlab and Simulink environments based on the laws of physics and thermodynamics. Simulations were run to achieve and analyze step responses, and different PI control structures were simulated and discussed. The dynamics of the centrifugal fan were pointed out as the primary reasons for the nonlinearity. Finally, different options and alternatives, both mechanical and software based, to compensate for the nonlinearity were presented.
Due to Covid-19, it was not possible to perform any tests on real hardware which was highly desirable. Instead, the results obtained in this thesis are base solely on theoretical discussions and simulations. Aspects that potentially could have been discovered through mechanical tests are therefore not considered. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9061627
- author
- Fritzon, Christopher and Persson, Nils
- supervisor
- organization
- year
- 2021
- type
- H3 - Professional qualifications (4 Years - )
- subject
- report number
- TFRT-6132
- other publication id
- 0280-5316
- language
- English
- id
- 9061627
- date added to LUP
- 2021-07-15 14:54:22
- date last changed
- 2021-07-15 14:54:22
@misc{9061627,
abstract = {{The thesis aims to develop knowledge of the physics and thermodynamics behind a nonlinearity in an air cooling system for an plastic extruder machine. To accomplish this, both nonlinear and linearized models were set up in Matlab and Simulink environments based on the laws of physics and thermodynamics. Simulations were run to achieve and analyze step responses, and different PI control structures were simulated and discussed. The dynamics of the centrifugal fan were pointed out as the primary reasons for the nonlinearity. Finally, different options and alternatives, both mechanical and software based, to compensate for the nonlinearity were presented.
Due to Covid-19, it was not possible to perform any tests on real hardware which was highly desirable. Instead, the results obtained in this thesis are base solely on theoretical discussions and simulations. Aspects that potentially could have been discovered through mechanical tests are therefore not considered.}},
author = {{Fritzon, Christopher and Persson, Nils}},
language = {{eng}},
note = {{Student Paper}},
title = {{Modelling and Control of an Extruder Cooling System}},
year = {{2021}},
}