• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2007.tde-10012008-102944
Document
Author
Full name
Lizbeth Leonor Paredes Aguilar
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2007
Supervisor
Committee
Donha, Decio Crisol (President)
Fernandes, Antonio Carlos
Maruyama, Newton
Title in Portuguese
Controle inteligente para a navegação de veículos submarinos semi-autônomos.
Keywords in Portuguese
Fuzzy
Robôs (controle)
Submersíveis não tripulados
Abstract in Portuguese
O emprego de técnicas de controle para veículos submarinos, envolve muitas questões de interesse prático e teórico. Neste trabalho apresenta-se o desenvolvimento de um sistema de controle inteligente e adaptativo a ser aplicado na navegação de veículos submarinos semi-autônomos (VSSAs). Utiliza-se uma técnica baseada no controle nebuloso (fuzzy), visando gerenciar o veículo submarino no controle de velocidade, profundidade, orientação e na evasão de obstáculos. A operação de veículos submarinos usando a técnica proposta, exige a definição, análise e tratamento de um vasto conjunto de comandos complexos manipulados pelo controlador. A metodologia utilizada divide a ação de controle em 3 fases. A primeira trata do posicionamento inicial do veículo submarino, a segunda fase trata da sua navegação e a fase final de gerenciar o comportamento do veículo próximo da posição-objetivo. A implementação funcional do controlador e dividida em módulos. O primeiro módulo informa o comportamento do ambiente e do próprio veículo, fornecendo dados iniciais sobre seu posicionamento e sua profundidade; um segundo módulo trata da presença de obstáculos em diferentes direções com dados fornecidos por sonares e assim determina as ações para a evasão de obstáculos. A ação de controle e estabelecida usando conceitos da teoria nebulosa (fuzzy) no universo de discurso, através de variáveis lingüísticas e de regras de inferência definidas a partir do conhecimento de especialistas, que envolvem a imprecisão característica do comportamento humano. As informações no final do processo são concentradas, de forma que a ação de controle e determinada para que possa enviar sinais de controle aos atuadores.
Title in English
Intelligent control for navigation of semi-autonomous submarine vehicles.
Keywords in English
Fuzzy control
Mobile robots
Submarine control
Underwater vehicles
Abstract in English
The design of underwater vehicle involves a very large number of practical and theoretical problems. In this work, it is tackled the development of a intelligent and adaptive controller, to be used in the navigation of semi-autonomous underwater vehicles (SAUV). To achieve this goal, a technique based on the fuzzy theory was employed to control the vehicle movements, including the evasion of obstacles. The operation of underwater vehicles using this approach demands the definition and treatment of a vast set of complex commands, manipulated by the controller. The control action is subdivided into three stages, the first one deals the control action during the initial positioning of the vehicle, a second stage deals with the navigation itself and the final stage deals the control action when the vehicle is close to the objective-position. The functional development of the controller was also subdivided into modules. The first module deals with the management of input data such as environmental disturbances and initial vehicle position, such as depth of the vehicle. The second module deals the detection of obstacles in different directions and the optimal evasion action to avoid collisions. The control action during a mission is established using concepts of the Fuzzy theory in the universe of speech, through linguistic variables and rules of inference defined from the knowledge of specialists, involving the characteristic imprecision of human behavior. In the end of the process, the information is defuzzificated, so that control actions are determined, allowing a practical implementation.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
M_PME.doc (39.00 Kbytes)
Publishing Date
2008-02-07
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2024. All rights reserved.