Fault Identification
Mostrando 1-12 de 31 artigos, teses e dissertações.
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1. Use of a combined SVD-Kalman filter approach for induction motor broken rotor bars identification
Abstract This paper describes a new parametric spectral estimator for the identification of rotor bar fault of an induction motor by analyzing the stator current. This approach combines two methods: The first one, the Singular Value Decomposition method which allows the accurate detection and location of the fault's signature frequency. The second method all
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-03
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2. Sistemas inteligentes para monitoramento e diagnósticos de falhas em motores de indução trifásicos / Intelligent systems for faults monitoring and diagnosis in three-phase induction motors
The objective of this thesis consists of the implementation of intelligent systems for three-phase induction motors fault diagnosis and condition monitoring. Therefore, an experimental test stand for stator winding inter-turn short circuit faults, broken rotor bar in squirrel cage and, finally, defective wheel bearing has been designed. The main focus is to
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/04/2012
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3. Modelagem nebulosa evolutiva: novas topologias e algoritmos de aprendizagem
This works aims to introduce new evolving fuzzy topologies and learning algorithms. Evolving fuzzy systems are defined as new class of intelligent fuzzy systems, with a high flexibility and autonomy. These systems are able to address problems like nonlinear system identification, control and pattern classification in a dynamic changing environment, adapting
Publicado em: 2011
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4. Contribuição ao Estudo de Máquinas Rotativas na presença de Não-Linearidades / Contribution to the Study of Rotating Machines containing nonlinearities
Esta tese procura enfocar problemas relacionados a rotores inteligentes, ou seja, aqueles que são capazes de monitorar seu comportamento dinâmico, analisálo, propor soluções com certa autonomia e garantir seu funcionamento mesmo quando do aparecimento de falhas que podem comprometer seu comportamento seguro ou sua eficiência. Este trabalho, de maneira
Publicado em: 2010
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5. Uma abordagem arquitetural para o desenvolvimento rigoroso de sistemas confiáveis baseados em componentes / A rigorous architectural approach to development component-based software systems
The incorporation of fault tolerance into systems normally increases their complexity, which consequently makes their analysis more difficult. Moreover, the use of exception handling mechanisms to develop robust software systems in a non-systematic manner can be a source of many design faults. This thesis presents a rigorous and architecture-centric developm
Publicado em: 2009
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6. PRIORIZAÇÃO DOS MODOS DE FALHA DE EQUIPAMENTOS UTILIZANDO OS MÉTODOS DE ANÁLISE MULTICRITÉRIO PROMETHEE E FUZZY PROMETHEE / PRIORITIZATION OF FAILURE MODES OF EQUIPMENT USING THE METHODS OF MULTICRITERIA ANALYSIS PROMETHE AND FUZZY PROMETHE
Aiming to meet the criteria of availability and reliability required by the rules of the Brazilian electric sector, energy companies have increased the use of systems for monitoring and diagnosis. This allows the identification of prior evidence of abnormalities in the operational condition of substation equipment, enabling the practice of predictive mainten
Publicado em: 2009
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7. DIAGNÓSTICO DE FALHAS INCIPIENTES EM TRANSFORMADORES DE POTÊNCIA UTILIZANDO A TEORIA DA EXTENSÃO / FAULT INCIPIENT DIAGNOSIS IN POWER TRANSFORMERS USING EXTENSION THEORY
Power transformers play an important role in the power energy supply, demanding the continuous monitoring of process that could lead to operation faults, specifically in the equipment electric insulation. Methods considered in the standards IEC, IEEE and NBR7274 for dissolved gas analysis (DGA) do not provide good levels of accuracy, because there are scenar
Publicado em: 2008
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8. Monitoring fails in tubes using signals digital processing / Sistema de monitoramento de falhas em tubulações por meio de processamento digital de sinais
Natural gas has hazardous contaminants that, besides being corrosive, compromise the quality for the consumption. For in such a way the present residual water condensation in the gas can start a local corrosive process, which could cause damage to the structure of the gas ducts. Due to the great length of a gas duct, corrosive components decrease its quality
Publicado em: 2008
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9. 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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10. Detecção e isolamento de falhas em sistemas dinâmicos baseados em redes neurais
This master dissertation presents the development of a fault detection and isolation system based in neural network. The system is composed of two parts: an identification subsystem and a classification subsystem. Both of the subsystems use neural network techniques with multilayer perceptron training algorithm. Two approaches for identifica-tion sta
Publicado em: 2007
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11. Geologia do sudoeste do Estado de Goiás : Integração de dados geológicos e aerogeofísicos de alta densidade
The airborne magnetic and gamma ray spectrometry data related to the Airborne Geophysic Survey Project of the State of Goiás (Block 1) executed between 2004 and 2006 and considered of high density by the acquisition and treatment configuration, were integrated in GIS environment with the existing geologic information, in the SW Goiás region located from th
Publicado em: 2007
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12. Integration of remote sensing (SRTM and RADARSAT-1) geology, gravimetry and magnetometry date as an aid to a morphostructural study in the Uatumã River area, Amazon Basin / Integração de dados de sensoriamento remoto (SRTM e RADARSAT-1), geologia, gravimentria e magnetometria para estudo morfoestrutural da área do Rio Uatumã, Bacia do Amazonas
Drainage network automatically extracted from a SRTM digital elevation model was combined with geologic, gravity and magnetometry data for morphostructural study in the region of the Uatumã River, Amazonas Sedimentary Basin. Data interpretation allowed the identification of different drainage patterns, including trellis, pinnate, contorted, annular and angu
Publicado em: 2006