Variable Structure Systems
Mostrando 13-24 de 62 artigos, teses e dissertações.
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13. Avaliação de controle neural a um processo de quatro tanques acoplados
The main goal of this doctorate thesis is the evaluation of neural control on a four interconnected tanks process, in laboratory environment, where the controlled variable is the water level height of the fourth tank. The dynamics of this process is non linear, as the outflow from the tanks depends on the square root of corresponding water height. This type
Publicado em: 2009
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14. Controlador adaptativo backstepping a estrutura variável
In this work, a Variable Structure Adaptive Backstepping Controller (VS-ABC) for monovariable, linear time invariant plants with relative degree one is presented. Instead of traditional integral adaptive laws for estimating the plant parameters, switching laws are used to increase robustness to parametric uncertainties and disturbances, as well as, to improv
Publicado em: 2008
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15. Controlador adaptativo por modelo de referência e estrutura variável aplicado ao controle de ângulo de carga e fluxo de campo de um gerador síncrono
Nesta dissertação de mestrado é apresentada uma aplicação do Controlador Adaptativo por Modelo de Referência e Estrutura Variável em um Gerador Síncrono conectado a um barramento innito, para o controle do ângulo de carga e fluxo de campo deste gerador. Uma teoria de desacoplamento é usada no modelo do Gerador Síncrono para se obter dois subsistem
Publicado em: 2008
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16. Controlador em modo dual adaptativo robusto - DMARC
Neste trabalho é apresentada uma proposta de um controlador, denominado Controlador em Modo Dual Adaptativo Robusto (DMARC), que estabelece uma ligação entre um controlador adaptativo por modelo de referência (MRAC) e um controlador adaptativo por modelo de referência e estrutura variável (VS-MRAC). A idéia básica é incorporar as vantagens de desemp
Publicado em: 2008
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17. Structural analysis of bending stiffeners with complex geometries utilized in offshore operations. / Análise estrutural de enrijecedores à flexão de geometria complexa utilizados em operações offshore.
The bending stiffeners discussed in this work are ancillary structural components installed on flexible lines at their connections with floating units in offshore oil production systems. The configuration of these accessories must provide the installation with a gradual variation of the bending stiffness near the lines attaching point, smoothing the curvatur
Publicado em: 2008
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18. SOIL PHYSICAL AND BIOLOGICAL CHARACTERIZATION AFTER HERBICIDES APPLICATION IN BLACK WATTLE (Acacia mearnsii De Wild.) STANDS IN RIO GRANDE DO SUL / CARACTERIZAÇÃO FÍSICA E BIOLÓGICA DO SOLO APÓS APLICAÇÃO DE HERBICIDAS EM PLANTIOS DE ACÁCIA-NEGRA (Acacia mearnsii De Wild.) NO RIO GRANDE DO SUL
The study of soil quality biological indicators in areas classified as forest production units is important to understand the ecological processes that occur in these systems. Monitoring the soil fauna in modified environments, when management practices involve chemical products in the environment, is an instrument that allows to evaluate not only the soil q
Publicado em: 2008
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19. Estudos estruturais de histatina-5 e seu análogo, TOAC0-histatina-5: interação com metais e sistemas biomiméticos / Structural studies of Histatin-5 and its analogue, TOAC0-Histatin-5: interaction with metals and biomimetic systems
The mechanism of action of histatin-5 (Hst-5), an antifungal antimicrobial peptide from human saliva is not completely clarified. Circular dichroism (CD), fluorescence, and electron paramagnetic resonance (EPR) were used to examine the conformational behavior of Hst-5 and its analogue containing the paramagnetic amino acid TOAC at the N-terminus (TOAC0-Hst-5
Publicado em: 2008
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20. Cyclical temporal variation in fish assemblages at one continental and one insular sandy beaches in the Sepetiba bay. / Variações temporais cíclicas nas assembléias de peixes de uma praia continental e uma insular na baía de Sepetiba.
Bays are semi-closed coastal systems that have beaches whose environmental characteristics, location and degree of anthropogenic influences determine fish assemblages that recruit in these systems and are modeled by seasonal e short term cyclical variation. Two sandy beaches in the outer zone of Sepetiba bay were sampled throughout seasonal, daily and tide c
Publicado em: 2008
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21. Histórias infantis como promotoras de comunicação em psicologia pediátrica
Scientific and technological development in health care during the latest decades have pointed out the relevance of communication systems and information availability to pediatric patients, aiming the acquisition and maintenance of an active behavior during the development process and, specially during the exposition to heath treatment contingencies. This st
Publicado em: 2008
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22. Dinâmica do uso dos recursos hídricos nas bacias do ribeirão Entre Ribeiros e do rio Preto, afluentes do rio Paracatu / Water resources use dynamics in watersheds of Ribeirão Entre Ribeiros and Rio Preto, tributaries of the Paracatu River
From times past, humanity confronts problems of environmental degradation. The environment, which always performed efficiently its function of filtration, today finds itself excessively overburdened by human activities: it suffers the risk of its resources exhausting, not being able in certain situations to recuperate itself and needing the help of man. Howe
Publicado em: 2008
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23. Processos metalogenéticos em ambientes de arco magmático tipo andino, caso de estudo: mineralizações da região dos Andes Patagônicos setentrionais do Chile / Metallogenic processes in andean volcanic arc setting, study case: mineralizations in the Chilean North-Patagonion Andes
In the Patagonian Andes region between 41 and 44° S extensive and continuous plutonic rocks of the North-Patagonian Batholith north segment are exposed. During their evolution most of the granitic rocks were emplaced in metamorphic rocks and other parts were emplaced in Late Jurassic-Berriasan volcanic rocks, Early Cretaceous sedimentary and volcanic rocks,
Publicado em: 2008
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24. Treinamento de redes neurais artificiais baseado em sistemas de estrutura variável com taxa de aprendizado adaptativa
This work presents new algorithms for training multilayer perceptron artificial neural networks based on stability properties of sliding mode variable structure systems. The main feature of the proposed algorithms is the adaptability of the gain (learning rate), which is obtained from each update step of the network weights, without the use of heuristics met
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/03/2007