Fuzzy Control
Mostrando 13-24 de 169 artigos, teses e dissertações.
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13. Control of input delayed pneumatic vibration isolation table using adaptive fuzzy sliding mode
AbstractPneumatic isolators are promising candidates for increasing the quality of accurate instruments. For this purpose, higher performance of such isolators is a prerequisite. In particular, the time-delay due to the air transmission is an inherent issue with pneumatic systems, which needs to be overcome using modern control methods. In this paper an adap
Lat. Am. j. solids struct.. Publicado em: 2015-08
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14. Local linear model tree and Neuro-Fuzzy system for modelling and control of an experimental pH neutralization process
This paper describes the modelling and control of a pH neutralization process using a Local Linear Model Tree (LOLIMOT) and an adaptive neuro-fuzzy inference system (ANFIS). The Direct and Inverse model building using LOLIMOT and ANFIS structures is described and compared. The direct and inverse models of the pH system are identified based on experimental da
Braz. J. Chem. Eng.. Publicado em: 2014-06
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15. A Multi-objective, active fuzzy force controller in control of flexible wiper system
Chaotic vibration has been identified in the flexible automotive wiper blade at certain wiping speeds. This irregular vibration not only decreases the wiping efficiency, but also degrades the driving comfort. A reliable nonlinear system identification namely nonlinear auto regressive exogenous Elman neural network (NARXENN) was adopted in first stage of this
Lat. Am. j. solids struct.. Publicado em: 2014
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16. A comparative analysis of three metaheuristic methods applied to fuzzy cognitive maps learning
This work analyses the performance of three different population-based metaheuristic approaches applied to Fuzzy cognitive maps (FCM) learning in qualitative control of processes. Fuzzy cognitive maps permit to include the previous specialist knowledge in the control rule. Particularly, Particle Swarm Optimization (PSO), Genetic Algorithm (GA) and an Ant Col
Pesqui. Oper.. Publicado em: 08/11/2013
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17. Automação de um sistema de pulverização para aplicação de agroquímicos a taxa variada usando injeção direta / Automation of a direct injection sprayer system for variable rate application of agrochemicals
In this work, the automation of a direct injection sprayer system for variable rate application of agrochemicals is presented. The automation of the sprayer system assembled on a laboratory static bench is based on a programmable controller with real time capabilities. Variable rate sprayer with direct injection systems allow multiple agrochemical applicatio
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/09/2012
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18. Evolving granular systems = : Sistemas granulares evolutivos / Sistemas granulares evolutivos
In recent years there has been increasing interest in computational modeling approaches to deal with real-world data streams. Methods and algorithms have been proposed to uncover meaningful knowledge from very large (often unbounded) data sets in principle with no apparent value. This thesis introduces a framework for evolving granular modeling of uncertain
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/07/2012
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19. Controle preditivo baseado em modelo neuro-fuzzy de sistemas não-lineares aplicado em sistema de refrigeração = : Model predictive control based on neuro-fuzzy nonlinear systems applied to a refrigeration plant / Model predictive control based on neuro-fuzzy nonlinear systems applied to a refrigeration plant
Refrigeration systems can be found in many different branches of industry and are characterized as great energy consumers with considerable non-linear behavior. Several studies have been developed to promote the reduction of energy costs and to minimize the effects of nonlinearities in these systems. The use of automation and process control, particularly th
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/07/2012
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20. Controle para bombeamento distribuído com vistas à minimização dos custos energéticos aplicado a sistemas de abastecimento de água / Distributed control for pumping with a view to minimizing costs of energy applied to water supply systems
O objetivo nesta pesquisa foi desenvolver um controlador não-linear, utilizando a técnica de controle inteligente fuzzy, aplicável a redes pressurizadas de distribuição de água setorizadas, automatizadas e com sistema de bombeamento distribuído, visando minimizar o consumo de energia elétrica. A metodologia empregada foi baseada na realização de di
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/06/2012
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21. O uso da lógica fuzzy no controle das temperaturas de um conjunto gaseificador/combustor de biomassas / Using fuzzy logic to control the temperatures of a set gasifier/combustor of biomasses
This study consisted in designing and building a concurrent biomass gasifier that, when attached to a gas combustor, produced a mix of hot air and ambient air to be used for drying grains, among other things. It aimed at controlling the combustion zone gasifier temperature and exhaust hot air temperature. The theoretical mathematical framework chosen to deve
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/04/2012
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22. Proposal of Fuzzy Control Based on Robust Stability Criteria: An approach in terms of transfer function applied to continuos time dynamic systems with time delay. / PROPOSTA DE CONTROLE BASEADO EM CRITÉRIO DE ESTABILIDADE ROBUSTA: UMA ABORDAGEM EM TERMOS DE FUNÇÃO DE TRANSFERÊNCIA APLICADA A SISTEMAS DINÂMICOS NO TEMPO CONTÍNUO COM ATRASO
Nesta dissertação é proposta uma metodologia de controle PID nebuloso robusto baseado nas especificações das margens de ganho e fase, para sistemas dinâmicos com atraso, no domínio do tempo contínuo. Um modelo nebuloso com estrutura Takagi-Sugeno é utilizado para representar o sistema dinâmico a ser controlado. Assim, a partir dos dados de entrada
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
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23. Fuzzy logic for structural system control
This paper provides some information and numerical tests that aims to investigate the use of a Fuzzy Controller applied to control systems. Some advantages are reported regarding the use of this controller, such as the characteristic ease of implementation due to its semantic feature in the statement of the control rules. On the other hand, it is also hypoth
Lat. Am. j. solids struct.. Publicado em: 2012
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24. Controle de sistemas nebulosos Takagi-Sugeno usando relaxações LMIs / LMI relaxations for control design of Takagi-Sugeno fuzzy systems
A principal contribuição dessa tese é a proposta de novas condições, em termos de desigualdades matriciais lineares, para a análise de estabilidade e síntese de controladores de sistemas nebulosos Takagi-Sugeno, casos discretos e contínuos no tempo. A lei de controle considerada é por realimentação de estados, sendo que para sistemas contínuos no
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/12/2011