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Environmental modelling and expert fuzzy control of climate in a miniature cropping house

Berry, Damon (1996) Environmental modelling and expert fuzzy control of climate in a miniature cropping house. Master of Science thesis, Dublin City University.

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Abstract

This work describes the development of an inexpensive control system for a miniature cropping house which uses the method of crop production. The control system was first developed in the Matlab-Simulink environment where it controlled a simulated model of the plant. The model was composed of four differential equations describing, air temperature in the cropping house, water temperature, C 0 2 concentration and inside humidity. The controller comprises a fuzzy “expert” controller which accepts inputs of light intensity and air temperature and returns fan speed and water temperature set-point as outputs. The latter was applied as a set-point for digital PID controller which controls water temperature in the cropping house. Expert advice, as well as knowledge of the plant gained from observation of the plant and the model, were used to develop fuzzy sets and a fuzzy rule-base. The controller was implemented in Matlab simulation language and tested on the model of the plant. Finally, the controller was implemented in “C” source and assembly for a standalone Motorola 68HC11 microprocessor based digital controller Development of software for the micro-controller was conducted using the Motorola’s Evaluation Tool-kit PCBUG. The controller circuits included two temperature sensing circuits, a light input and power control circuitry for both a DC fan and a set of aquarium heaters.

Item Type:Thesis (Master of Science)
Date of Award:1996
Refereed:No
Additional Information:In conjunction with Dublin Institute of Technology, Kevin Street. Dublin City University is the awarding institution.
Supervisor(s):Hayes, Richard
Uncontrolled Keywords:Crop science; Climate control
Subjects:Engineering > Electronic engineering
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Engineering and Computing > School of Electronic Engineering
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 License. View License
ID Code:18523
Deposited On:24 Jun 2013 11:11 by Celine Campbell. Last Modified 24 Jun 2013 11:11

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