Monitoring And Fault Detection
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Detecção de defeitos do tipo Resistive-Open em SRAM com o uso de lógica comparadora de vizinhança
The world we live today is very dependent of the technology advance and the Systemson- Chip (SoC) are one of the most important actors of this advance. As a consequence, the Moore s law has been outperformed due to this strong demand on the SoCs for growth, so that new silicon technologies has emerged along with new fault models that decreased the reliabilit
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2012
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2. Group Method of Data Handling (GMDH) e redes neurais na monitoração e detecção de falhas em sensores de centrais nucleares / Group method of data handling and neural networks applied in monitoring and fault detection in sensors in nuclear power plants
A demanda crescente na complexidade, eficiência e confiabilidade nos sistemas industriais modernos têm estimulado os estudos da teoria de controle aplicada no desenvolvimento de sistemas de Monitoração e Detecção de Falhas. Neste trabalho foi desenvolvida uma metodologia inédita de Monitoração e Detecção de Falhas através do algoritmo GMDH e Rede
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/06/2011
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3. Electrical system fault based on the resulting magnetic signature by Wavelet. / Análise da assinatura magnética resultante de faltas em sistemas elétricos via wavelets.
A methodology based on the analysis of magnetic fields for monitoring the quality of energy in electrical systems is presented herein. Aspects referring to fault detection in electrical systems in particular are evaluated. Contrary to the traditional monitoring process, in which sensors must be physically linked to the circuits under analysis, the results ar
Publicado em: 2009
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4. 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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5. Detecção da condição de rubbing em maquinas rotativas atraves da transformada Wavelet / Detection of rubbing condition on rotating machinery by wavelet transform
This work presents a detection procedure of the rubbing phenomenon and its effects in rotating machinery, applicable on the stationary and non-stationary regimes, using the Wavelet Transform as analysis tool. Firstly, the Continuous Wavelet Transform (CWT) is applied for stationary signals using the Complex Morlet wavelet as mother wavelet, for extracting of
Publicado em: 2008
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6. 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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7. Monitoramento permanente de motores de indução trifasicos / On-line monitoring of three-phase induction motors
A predictive maintenance program must include several techniques of monitoring of the electric motors conditions. Among these techniques, probably the two most classic ones are related to electric current and vibration analysis. Unfortunately, in both cases inherent drawbacks make difficult their use in loco on industry plants. As there is a large range of
Publicado em: 2007
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8. Monitoração e diagnóstico para detecção de falhas de sensores utilizando a metodologia GMDH / Monitoring and diagnosis for sensor fault detection using GMDH methodology
O sistema de detecção de falhas e diagnóstico é um sistema de suporte ao operador dedicado a funções específicas que alertam os operadores para problemas de falhas em sensores e atuadores, e auxiliam no diagnóstico antes que os limites normais de alarmes sejam atingidos. Sistemas de suporte ao operador surgiram para diminuir a complexidade dos painé
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2006
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9. Algoritmo de detecção de falhas para sistemas telefonicos utilizando a teoria do perigo / Fault detection algorithm for telephone systems using the danger theory
Abstract This thesis presents a fault detection algorithm composed of multiple interconnected modules, and operating according to the paradigm supported by the Danger Theory in immunology. This algorithm attempts to achieve significant features that a fault detection system is supposed to express when monitoring a telephone system. These features would basic
Publicado em: 2006
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10. DEVELOPMENT OF AN ARTIFICIAL NEURAL NETWORK FOR MONITORING AND DIAGNOSIS OF SENSOR FAULT AND DETECTION IN THE IEA-R1 RESEARCH REACTOR AT IPEN / "Utilização de redes neurais artificiais na monitoração e detecção de falhas em sensores do Reator IEA-R1"
The increasing demand on quality in production processes has encouraged the development of several studies on Monitoring and Diagnosis Systems in industrial plant, where the interruption of the production due to some unexpected change can bring risk to the operators security besides provoking economic losses, increasing the costs to repair some damaged equ
Publicado em: 2006
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11. Tolerance the Imperfections for the NIDIA: a Detection system of Intrusion Based on Intelligent Agents / Tolerância a Falhas para o NIDIA: um Sistema de detecção de Intrusão Baseado em Agentes Inteligentes
An Intrusion Detection System (IDS) is one tool among several existing ones to provide safety to a computational system. The IDS has the objective of identifying individuals that try to use a system in non-authorized way or those that have authorization but are abusing of their privileges. However, to accomplish the functions correctly an IDS needs to guaran
Publicado em: 2006
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12. Detecção e diagnóstico de falhas em motores de indução
This main purpose of this work is to design and implement a system to detect and diagnose electrical faults (stator inter-turn short circuit and broken rotor bars) and mechanical faults (unbalance and shaft misalignments) for three phase induction machines. This approach starts by obtaining the best patterns for fault detection and symmetrical models for the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/07/2005