O processo decisório nas empresas tem sido objeto de estudo de diversos pesquisadores e executivos e muito tem sido explorado e analisado sobre o tema. Este trabalho tem como objetivo utilizar a metodologia de Mapeamento do Fluxo de Valor (MFV) de modo integrado a um modelo de simulação computacional, construído com o software ARENA, para ampliar a visão do gestor na tomada de decisão. O objeto de estudo está baseado em um sistema produtivo que envolve um processo de embalamento automático de produtos, onde surgiu a necessidade de realizar modificações no atual sistema visando para acomodar novos produtos e para isso, devem-se detectar os possíveis gargalos e visualizar os impactos gerados pelas futuras modificações. A simulação visa a colaborar na tomada de decisão do gestor considerando que o sistema envolve diversas variáveis e seus comportamentos definem a complexidade do processo. Como resultados será apresentado o modelo de simulação computacional qualificado para representar o sistema atual e o futuro, com redução significativa dos custos de projeto por antecipar seu comportamento; em conjunto com os resultados do Mapeamento do Fluxo de Valor para identificar as atividades que agregam valor ou não para o processo. A validação do modelo de simulação ocorrerá com o mapa atual do sistema e com a inclusão de eventos Kaizen para que no mapa futuro, os desperdícios sejam encontrados de forma mais prática e confiável, auxiliando na tomada de decisão.
This paper aims to present numerical solutions for the problem of steady natural convection heat transfer by double diffusion from a heated cylinder buried in a saturated porous media exposed to constant uniform temperature and concentration in the cylinder and in the media surface. A square finite domain 3 Â 3 and acceptance criterion converged solution with an absolute error under 1 Â 10 À3 were considered to obtain results presented. The Patankar's power law for approaching of variables calculated T, C, and / also was adopted. In order of method validation, an investigation of mesh points number as function of Ra, Le, and N was done. A finite volume scheme has been used to predict the flow, temperature, and concentration distributions at any space from a heat cylinder buried into a fluid-saturated porous medium for a bipolar coordinates system. Examples presented show that the differences in the flow distribution caused not only when Rayleigh number range is considered but also when Lewis number range is considered. Further, increase in the Rayleigh number has a significant influence in the flow distribution when the concentration distribution is considered. Steady natural convection heat transfer by double diffusion from a heated cylinder buried in a saturated porous medium is studied numerically using the finite volume method. To model fluid flow inside the porous medium, the Darcy equation is used. Numerical results are obtained in the form of streamlines, isotherms, and isoconcentrations. The Rayleigh number values range from 0 to 1000, the Lewis number values range from 0 to 100, and the buoyancy ratio number is equal to zero. Calculated values of average heat transfer rates agree reasonably well with values reported in the literature.
All photovoltaic panel heats up when exposed to sunlight and this heating reduces the electrical power output of the same. This work presents the use of this unwanted waste heat, converting it into thermal energy directly by means of the Seebeck effect, which is the direct conversion of thermal energy into electrical energy by means of an arrangement of semiconductor materials that when exposed to temperature gradients generate electric current. In this work emphasis was placed on the influence of temperature on generation processes involved. Thus, the theoretical evaluation, it presents the mathematical models of thermoelectric and photovoltaic systems by raising the curves of voltage, current and electric power generated, and analyses the influence of temperature in each model. To obtain the simulation curves it uses MATLAB ® 5.3, taking into account the parameters of thermoelectric modules and real photovoltaic cells. In practical evaluation, a prototype was assembled containing thermoelectric module attached to the bottom of a photovoltaic panel in order to use the heat energy absorbed by the panel. The data were stored and analyzed, where we observed the influence of temperature in both systems, validating the mathematical modeling. It is the applicability of the mathematical model given the results obtained with the prototype system.
A Engenharia Mecânica da Produção é uma área muito importante para diversos setores industriais. As empresas procuram melhorar seus processos, métodos, filosofias, mecanismos e tecnologias para alcançarem melhores destaques competitivos diante da concorrência, conquistando maior participação e preferência dos consumidores num mercado acirrado. Neste trabalho, objetiva-se realizar uma análise comportamental da demanda de uma empresa do setor automobilístico simulando um cenário por meio da implantação de ampliação da visibilidade das etapas do processo fabril, de trânsito e de armazenagem. A metodologia empregada envolve uma ampla revisão de diversos casos em que a ferramenta de simulação é utilizada para disponibilizar a visibilidade de diferentes etapas da produção. Espera-se demonstrar que a demanda linear pode equalizar o nível de estoque aliado à aplicação de um modelo de política de comercialização dos produtos e atendimento da demanda com a ampliação da visibilidade da rede de concessionárias dessa empresa, possibilitando a colocação de pedidos em qualquer etapa da cadeia produtiva.
Historically, the guide cable system for installation of subsea oil production equipment has proven its efficiency. These cables extend from the rig to the wellhead, which are fixed to the guide base posts and will be subject to loads during the installation and operation of the production equipment. The majority of guide base designs have been calculated by analytical methods, although they allow obtaining exact answers in all infinite points of a structure, they are not applicable to all cases. This motivated the application of finite element analysis method (FEA) in this work, which from the development of approximate procedures can be applied regardless of the structure shape and loading conditions. This paper consists of a structural analysis of the guide base frame model, generated in Autodesk Inventor® software and analyzed in ANSYS® Workbench. The study brings a diagnostic research using a quantitative and exploratory approach. Different mathematical models were generated to obtain the results at the most critical points of the structure in order to determine its resistance to the loads applied during installation and operation, taking into account the criteria laid down in DNV 2.7-3, API 17D 1st Ed and von-Mises equivalent stress.
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