Environmental Control for Plants using Intelligent Control Systems

Ibrahim A. Hameed

ISBN 10: 3656152454 / ISBN 13: 9783656152453

Published by GRIN Verlag, 2012

About this Item

Druck auf Anfrage Neuware - Printed after ordering - Master's Thesis from the year 2005 in the subject Engineering - Artificial Intelligence, grade: MSc, , course: Intelligent Control, language: English, abstract: [.] In practice, conventional controllers were used to control the system however theirparameters are empirically adjusted. Besides, the operation of these controllers relies on themeasurements provided by sensors located inside and near the greenhouse. If theinformation provided by one or several of these sensors is erroneous, the controllers will not operate properly. Similarly, failure of one or several of the actuators to functionproperly will impair the greenhouse operation. Therefore, an automatic diagnosis system offailures in greenhouses is proposed. The diagnosis system is based on deviations observedbetween measurements performed in the system and the predictions of a model of thefailure-free system. This comparison is done through a bank of fuzzy observers, where eachobserver becomes active to a specific failure signature and inactive to the other failures.Neural networks are used to develop a model for the failure-free greenhouse.The main objective of this thesis is to explore and develop intelligent control schemesfor adjusting the climate inside a greenhouse. The thesis employs the conventional Pseudo-Derivative Feedback (PDF) Controller. It develops the fuzzy PDF controller (FPDF). Thethesis also, develops two genetic algorithm (GA) based climatic control schemes, one isgenetic PDF (GPDF) and the other is genetic FPDF (GFPDF). The former uses GA toadjust the gains of the Pseudo-Derivative Feedback Controller (GPDF) and the later usesgenetic algorithm to optimize the FPDF controller parameters (i.e., scale factors and/orparameters of the membership functions). Finally, the thesis develops a fuzzy neural faultdetection and isolation system (FNFDIS), in which a bank of fuzzy observers are designedto detect faults that may occur in the greenhouse end items (e.g., sensors and actuators).Simulation experiments are performed to test the soundness and capabilities of thedeveloped control schemes for controlling the greenhouse climate. The proposed schemesare tested through two experiments, setpoint tracking test and regulatory control test. Also,the proposed diagnostic system was tested through four experiments. Compared with theresults obtained using the conventional controllers, best results have been achieved usingthe proposed control schemes.

Seller Inventory # 9783656152453

Bibliographic Details

• Title: Environmental Control for Plants using Intelligent Control Systems
• Publisher: GRIN Verlag
• Publication Date: 2012
• Language: English
• ISBN 10: 3656152454
• ISBN 13: 9783656152453
• Binding: Taschenbuch
• Condition: Neu
• Dimensions: 210W x 148H x 11D millimeters 210 millimeters width by 148 millimeters height by 11 millimeters depth
• Weight: 230 grams

About this title

Synopsis

Master's Thesis from the year 2005 in the subject Computer Sciences - Artificial Intelligence, grade: MSc, course: Intelligent Control, language: English, abstract: [...] In practice, conventional controllers were used to control the system however their parameters are empirically adjusted. Besides, the operation of these controllers relies on the measurements provided by sensors located inside and near the greenhouse. If the information provided by one or several of these sensors is erroneous, the controllers will not operate properly. Similarly, failure of one or several of the actuators to function properly will impair the greenhouse operation. Therefore, an automatic diagnosis system of failures in greenhouses is proposed. The diagnosis system is based on deviations observed between measurements performed in the system and the predictions of a model of the failure-free system. This comparison is done through a bank of fuzzy observers, where each observer becomes active to a specific failure signature and inactive to the other failures. Neural networks are used to develop a model for the failure-free greenhouse. The main objective of this thesis is to explore and develop intelligent control schemes for adjusting the climate inside a greenhouse. The thesis employs the conventional Pseudo- Derivative Feedback (PDF) Controller. It develops the fuzzy PDF controller (FPDF). The thesis also, develops two genetic algorithm (GA) based climatic control schemes, one is genetic PDF (GPDF) and the other is genetic FPDF (GFPDF). The former uses GA to adjust the gains of the Pseudo-Derivative Feedback Controller (GPDF) and the later uses genetic algorithm to optimize the FPDF controller parameters (i.e., scale factors and/or parameters of the membership functions). Finally, the thesis develops a fuzzy neural fault detection and isolation system (FNFDIS), in which a bank of fuzzy observers are designed to detect faults that may occur in the greenhouse end items (e.g.., sensor