901 resultados para Projeto de engenharia


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Trabalho de Projeto para obtenção do grau de Mestre em Engenharia Civil Estruturas

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The necessity of the insertion of the capital of Rio Grande do Norte in the world-wide commercial scene and its claim as the seat of political power, in ends of nineteenth and beginning of twentieth century, determined the direction of urban interventions undertaken by government to restructure the city. In that matter, there were several actions of improvements and embellishment in Natal, which had, as a starting point, the adequacy works of the port, located in the Ribeira quarter, with the aim of ending the physical isolation that reinforced its economic stagnation. Besides the problems faced in the opening bar of the Potengi River, and would complement the required improvements, other barriers demonstrate the tension established between the physic-geographic field and the man: the flooded and slope which connected Cidade Alta and Ribeira the first two quarters of the city.The execution of these works demanded knowledge whose domain and application it was for engineering. But, how the actions done for the engineers, in sense to transform natural areas into constructed spaces made possible the intentional conformation of the quarter of the Ribeira in a commercial and politician-administrative center, in the middle of the XIX century and beginning of the XX? Understand, therefore, the employment effects of technology on the physical-geographical Ribeira, is the objective of this work that uses theoretical and methodological procedures of Urban Environmental History, by analyzing the relationship between the environment and the man, mediated by knowledge and use of technologies. The documental research was used, as primary sources, the Messages of the Provincial Assembly Government that later became the Legislative Assembly of Rio Grande do Norte reports and articles on specialized publications, in addition to local newspapers. The work is structured in five chapters. First, some comments about Urban Environmental History (Chapter 1) supplemented with analysis of the conceptual construction of nature in the Contemporary Era and its application in the city (chapter 02), the following chapters (03 and 04) deal with the rise of engineers as a active group in the Brazilian government frameworks and their vision about the nature inside the urban environment and it is studied how the professional technicians dealt with the improvement work of the harbor and in the shock with the natural forces. Other works that would complement this "project" of modernization and had had natural obstacles to be removed the Ribeira flood and slope constitute the subject of the fifth chapter. Finally, some final considerations retake the initial discussions aiming an association between the technique and the nature as junction elements inside the process of constitution of a Modern Natal

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A presente investigação identifica o caminho seguido no estudo que se centrou na durabilidade dos produtos como estratégia para a prevenção/redução dos impactes ambientais provocados pela excessiva produção e consumo das sociedades ocidentais. O trabalho baseou-se primeiramente na reunião de argumentos que justificassem a necessidade da investigação. A partir dos conhecimentos obtidos sobre as consequências do descarte prematuro de produtos, incluindo a produção de resíduos e utilização de recursos naturais, a investigação foi direcionada para as estratégias que motivam a redução do consumo pelo aumento da vida útil do produto. A durabilidade de alguns produtos designados de Clássicos do Design motivou o desenvolvimento da investigação. Depois de definido o universo que se enquadra nesta categoria, foi selecionada uma amostra que se considerou representativa e criou-se uma base de dados onde se sistematizou os conteúdos relevantes a conhecer. Através da análise qualitativa e quantitativa da amostra desses produtos, obteve-se uma matriz operativa composta por 10 princípios que pode ser introduzida no processo de design de novos produtos para aquisição de um tempo de vida útil inicial potencialmente maior. Os resultados da aplicação prática da estratégia desenvolvida, a tese, determinarão no futuro a conceção e produção de artefactos que se pretende apresentar à indústria nacional.

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Trabalho Final de Mestrado para obtenção do grau de Mestre em Engenharia Civil na Área de Especialização de Estruturas

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Trabalho de Projeto para obtenção do grau de Mestre em Engenharia Civil na Área de Especialização Estruturas

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Trabalho de Projeto para obtenção do grau de Mestre em Engenharia Civil na Área de Especialização em Estruturas

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Trabalho Final de Mestrado para obtenção do grau de Mestre em Engenharia Mecânica com Especialização em Energia, Climatização e Refrigeração

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This paper presents the development of a boost converter with the possibility of higher gain than the conventional boost converter for applications under similar conditions and increased power. Presents the main concepts involving the boost converter and two variations: the boost converter of three levels and the boost converter interspersed with two converter cells. The breakdown mounting positions, the operating steps, the addressing and the main strengths of each converter in order to check for possible uses in the construction of a prototype joining their main advantages. In the presentation of this converter addresses the operating steps, the equation governing its design, the simulations obtained through software (PSIM), a comparison between the boost converter models studied and the experimental results.

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In recent years the photovoltaic generation has had greater insertion in the energy mix of the most developed countries, growing at annual rates of over 30%. The pressure for the reduction of pollutant emissions, diversification of the energy mix and the drop in prices are the main factors driving this growth. Grid tied systems plays an important role in alleviating the energy crisis and diversification of energy sources. Among the grid tied systems, building integrated photovoltaic systems suffers from partial shading of the photovoltaic modules and consequently the energy yield is reduced. In such cases, classical forms of modules connection do not produce good results and new techniques have been developed to increase the amount of energy produced by a set of modules. In the parallel connection technique of photovoltaic modules, a high voltage gain DC-DC converter is required, which is relatively complex to build with high efficiency. The current-fed isolated converters explored in this work have some desirable characteristics for this type of application, such as: low input current ripple and input voltage ripple, high voltage gain, galvanic isolation, feature high power capacity and it achieve soft switching in a wide operating range. This study presents contributions to the study of a high gain and high efficiency DC-DC converter for use in a parallel system of photovoltaic generation, being possible the use in a microinverter or with central inverter. The main contributions of this work are: analysis of the active clamping circuit operation proposing that the clamp capacitor connection must be done on the negative node of the power supply to reduce the input current ripple and thus reduce the filter requirements; use of a voltage doubler in the output rectifier to reduce the number of components and to extend the gain of the converter; detailed study of the converter components in order to raise the efficiency; obtaining the AC equivalent model and control system design. As a result, a DC-DC converter with high gain, high efficiency and without electrolytic capacitors in the power stage was developed. In the final part of this work the DC-DC converter operation connected to an inverter is presented. Besides, the DC bus controller is designed and are implemented two maximum power point tracking algorithms. Experimental results of full system operation connected to an emulator and subsequently to a real photovoltaic module are also given.

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A necessidade contínua de incrementar a produtividade em todos os sectores leva a que sejam utilizados equipamentos cada vez mais sofisticados, permitindo novas técnicas de abordagem dos processos de fabrico, velocidades mais elevadas e maior precisão no produto final. No entanto, quase todos os equipamentos necessitam de ferramentas adequadas, que tirem partido efetivamente das potencialidades dos equipamentos disponíveis. A Engenharia tem aqui um papel extremamente importante, já que terá de conceber as ferramentas atendendo à satisfação de um elevado número de requisitos, que passam genericamente por tirar o máximo partido dos fatores tecnológicos proporcionados pelos equipamentos, cumprir com a cadência de produção necessária, assegurar a qualidade estipulada, garantir a segurança dos colaboradores que com ela trabalham e permitir uma fácil montagem e afinação, reduzindo assim os tempos de preparação e as possibilidades de fabrico de peças fora das especificações. Este trabalho foi desenvolvido em torno de uma necessidade real, tendo sido estipulados os requisitos necessários pelo cliente e tendo sido elaborado todo o projeto da ferramenta em torno desses mesmos requisitos. Foi efetuada uma otimização da ferramenta ainda na fase de anteprojeto, permitindo minimizar o seu custo e maximizar o seu rendimento e aptidão para o fim em vista. Os materiais foram cuidadosamente selecionados, tendo em vista a utilização de cada componente e a relação custo‐benefício. Foi ainda efetuada uma orçamentação da mesma, assim como um plano de instruções para a operação e manutenção da ferramenta. Deste modo, este trabalho é o resumo de grande parte do conhecimento adquirido, quer ao longo da vida académica, quer ao longo da experiência profissional.

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Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Civil e Ambiental, 2016.

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The necessity of the insertion of the capital of Rio Grande do Norte in the world-wide commercial scene and its claim as the seat of political power, in ends of nineteenth and beginning of twentieth century, determined the direction of urban interventions undertaken by government to restructure the city. In that matter, there were several actions of improvements and embellishment in Natal, which had, as a starting point, the adequacy works of the port, located in the Ribeira quarter, with the aim of ending the physical isolation that reinforced its economic stagnation. Besides the problems faced in the opening bar of the Potengi River, and would complement the required improvements, other barriers demonstrate the tension established between the physic-geographic field and the man: the flooded and slope which connected Cidade Alta and Ribeira the first two quarters of the city.The execution of these works demanded knowledge whose domain and application it was for engineering. But, how the actions done for the engineers, in sense to transform natural areas into constructed spaces made possible the intentional conformation of the quarter of the Ribeira in a commercial and politician-administrative center, in the middle of the XIX century and beginning of the XX? Understand, therefore, the employment effects of technology on the physical-geographical Ribeira, is the objective of this work that uses theoretical and methodological procedures of Urban Environmental History, by analyzing the relationship between the environment and the man, mediated by knowledge and use of technologies. The documental research was used, as primary sources, the Messages of the Provincial Assembly Government that later became the Legislative Assembly of Rio Grande do Norte reports and articles on specialized publications, in addition to local newspapers. The work is structured in five chapters. First, some comments about Urban Environmental History (Chapter 1) supplemented with analysis of the conceptual construction of nature in the Contemporary Era and its application in the city (chapter 02), the following chapters (03 and 04) deal with the rise of engineers as a active group in the Brazilian government frameworks and their vision about the nature inside the urban environment and it is studied how the professional technicians dealt with the improvement work of the harbor and in the shock with the natural forces. Other works that would complement this "project" of modernization and had had natural obstacles to be removed the Ribeira flood and slope constitute the subject of the fifth chapter. Finally, some final considerations retake the initial discussions aiming an association between the technique and the nature as junction elements inside the process of constitution of a Modern Natal

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Dissertação de Mestrado, Engenharia Elétrica e Eletrónica, Especialização em Sistemas de Energia e Controlo, Instituto Superior de Engenharia, Universidade do Algarve, 2015

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Dissertação de Mestrado, Arquitetura Paisagista, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2016

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Dissertação de Mestrado, Arquitetura Paisagista, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2016