58 resultados para Estimadores de confiabilidade de individuais
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Reabilitação Oral - FOAR
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Pós-graduação em Engenharia Elétrica - FEIS
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Pós-graduação em Engenharia Elétrica - FEIS
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In an ever more competitive environment, power distribution companies must satisfy two conflicting objectives: minimizing investment costs and the satisfaction of reliability targets. The network reconfiguration of a distribution system is a technique that well adapts to this new deregulated environment for it allows improvement of reliability indices only opening and closing switches, without the onus involved in acquiring new equipment. Due to combinatorial explosion problem characteristic, in the solution are employed metaheuristics methods, which converge to optimal or quasi-optimal solutions, but with a high computational effort. As the main objective of this work is to find the best configuration(s) of the distribution system with the best levels of reliability, the objective function used in the metaheuristics is to minimize the LOLC - Loss Of Load Cost, which is associated with both, number and duration of electric power interruptions. Several metaheuristics techniques are tested, and the tabu search has proven to be most appropriate to solve the proposed problem. To characterize computationally the problem of the switches reconfiguring was developed a vector model (with integers) of the representation of the switches, where each normally open switch is associated with a group of normally closed switches. In this model simplifications have been introduced to reduce computational time and restrictions were made to exclude solutions that do not supply energy to any load point of the system. To check violation of the voltage and loading criteria a study of power flow for the ten best solutions is performed. Also for the ten best solutions a reliability evaluation using Monte Carlo sequential simulation is performed, where it is possible to obtain the probability distributions of the indices and thus calculate the risk of paying penalty due to not meeting the goals. Finally, the methodology is applied in a real Brazilian distribution network, and the results are discussed.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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In chemical industry, petrochemical and oil refinery may be found situations that working pressures and very high temperatures, and alloys that comprise such equipment must have specific characteristics such. As a way to ensure that the materials are as designed, companies have some specific techniques, and one of them is X-ray fluorescence spectrometry, which allows its application in devices small and lightweight, which ensures its portability in field use. This technique however, has some shortcomings such as the impossibility of detecting carbon and other elements of low atomic number which can generate false identifications of elements that are not in the league or non-detection of existing elements. Therefore, this study investigated the reliability of this method using the apparatus Niton XL3t 800 and may conclude that their results are reliable and can be used to assist in ensuring the operational integrity of the production units of these companies
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The growing demand for quality at competitive prices and fast production process put to the test function in the industrial Maintenance. The need for equipment with high availability to fit this fierce competitiveness makes maintenance becomes essentially reliable. Despite this current context, many companies still have an old view of maintenance, focused only on corrective services, and proposals for change are often neglected due to the sense of urgency day to day. Thus, this study aims to demonstrate through theoretical applicability of simple tool, but of great value in increasing reliability within the maintenance sector of an industry, applying the concepts of Reliability Centered Maintenance – RCM and Analysis tool Failure Modes and Effects – FMEA in equipment of a chemical company directly involved in the manufacturing process of the brake fluid, which this product is used in vehicles around the country. That way, you can identify the types, occurrence and criticality of each failure and evaluate assertively decision making for each device, avoiding unnecessary downtime and potential failures of the same
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Apesar de inúmeros estudos e pesquisas relatarem os benefícios da atividade física na qualidade do sono, pode-se observar que quando tratamos do esporte, principalmente o esporte de alto rendimento, seus praticantes nem sempre apresentam a mesma qualidade. Aspectos como estresse, medo, excesso de cargas de treinamento e, principalmente, a ansiedade podem alterar os padrões do ciclo sono-vigília e diminuir a qualidade do sono, podendo provocar grandes prejuízos na performance durante provas e competições. A presença de torcida, pais ou amigos em competições ou jogos, a participação de peneiras ou o simples fato de ser ou não convocado para o jogo, até a obrigação da vitória, a pressão exercida por técnicos e patrocinadores, entre outras características do esporte de rendimento, são contribuintes da aparição do sentimento ansioso. Alguns autores discutem a possibilidade de que esse sentimento apresenta-se com graus diferenciados entre atletas de modalidades individuais e coletivas. Nos esportes individuais, os atletas não compartilham responsabilidades, expondo-se sozinhos a uma avaliação direta dos expectadores, gerando uma pressão desproporcional à demonstração de excelência na performance. A partir disso, o objetivo deste estudo foi investigar a presença de alterações no sono de atletas, considerando a modalidade em que estão inseridos (individual ou coletiva) e suas possíveis diferenças. A pesquisa compreendeu um estudo de campo em adotamos os procedimentos das pesquisas qualitativas. Foi utilizado um questionário avaliando a percepção subjetiva da qualidade do sono de atletas das modalidades: handebol masculino, atletismo masculino, voleibol feminino e ginástica artística feminina. Os resultados encontrados levam à especulação de que existem alterações na qualidade do sono dos atletas principalmente nas noites que antecedem competições ...(Resumo completo, clicar acesso eletrônico abaixo)