Mestrado em Engenharia Mecânica

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http://repositorio.ufes.br/handle/10/17622

Nível: Mestrado Acadêmico
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Navegando Mestrado em Engenharia Mecânica por Autor "Abreu, Luiz Alberto da Silva"

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    Estimativa de estados e parâmetros para microtrocadores de calor utilizando filtros de partículas
    (Universidade Federal do Espírito Santo, 2016-11-07) Cosmo, Marcos Palácio; Abreu, Luiz Alberto da Silva; Silva, Wellington Betencurte da; Dutra, Júlio Cesar Sampaio; Martins, Marcio Ferreira
    The control of the temperature field in photovoltaic cells has fundamental importance for its correct functioning. This work deals with the analysis through inverse problems involving two Micro-heat exchanger composed respectively of one and three circular microchannels. These equipments are commonly used in the temperature control of photovoltaic cells, its efficiency is directly associated with the flow velocities inside the microchannels that make up the Micro-heat. In this work, estimates were obtained for the flow velocities of the fluid inside the microchannels and, also, for the entire temperature field of the Micro-heat exchanger. The solution of the associated direct problem was obtained through Fluent software (ANSYS) that was interconnected to the MatLab platform. The MatLab was used in the implementation of the SIR Filter, on the inverse problem. The results obtained by simulated measurements of temperature showed that the fluid velocities and the temperature range of the Micro-heat exchanger can be estimated accurately in the presence of different noise levels in the measurements.
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    Identificação de falhas em compósitos laminados usando Unscented Kalman Filter
    (Universidade Federal do Espírito Santo, 2018-03-09) Florindo, Leone Bernardo; Abreu, Luiz Alberto da Silva; Silva, Wellington Betencurte da; Martins, Márcio Ferreira; Soares, Vinícius Barroso
    Composite materials have numerous applications in the most varied areas of engineering.In this scope, mastery of these materials becomes necessary. The composite materialacquires properties of each materials that constitute it. However, between its layers theremay be adhesion failures, compromising its quality. In this way, it is proposed to estimatethe thermal contact conductance at the interface of a laminated composite, which canbe directly associated with adhesion failures. Therefore, it was proposed to apply theUnscented Kalman Filter with the method of lines to solve an inverse heat transfer problem.It was established a physical problem characterized by being transient regime and two-dimensional, then the thermal contact conductance at the interface between the layers is afunction of time and space in one direction. The temperature measurements used as inputdata for the equations that model the problem were obtained through simulations. In thetests carried out, a variety of materials and composite dimensions were used. A sensitivityanalysis was made regarding noises in the measuared temperatures and a verification ofthe influence of the time in the physical problem relating to the computational effort. Theresults have shown that the methods applied were effective to indentify the laminatedcomposite failure