Thesis (M.S.)--Florida State University, 2006. / Advisor: Yousef Haik, Florida State University, College of Engineering, Dept. of Mechanical Engineering. Title and description from dissertation home page (viewed June 9, 2006). Document formatted into pages; contains ix, 57 pages. Includes bibliographical references.

No description available.

This thesis examines the influence of different gate operation curves on the surplus or deficiency of energy input to a hydraulic turbine accompanying a sudden change of load on the turbine. A general solution to the problem is obtained by evaluating the energy input to the penstock and the energy conversion within the penstock during transient conditions. The results show that for given maximum pressure rise or drop, a considerable reduction in the surplus or deficiency of energy input to the turbine can be obtained by use of a suitable gate operation curve. At the same time it is possible to reduce the hydraulic oscillations in the system. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

A linearized mathematical model for the analysis of turbine speed governing problem is presented. This model includes the elasticity effects of both water and penstock walls, the effects of turbine characteristic slopes, and the linearized equation of a proportional-integral hydraulic governor. The procedure can be extended to a governor with a derivative term as well. Exact, travelling-wave solutions for the different possible cases are derived and presented in simple forms. Taylor's expansion formulas which offer a more efficient alternative for numerical evaluation of the speed are also derived. Solutions in both cases take into consideration penstock friction losses in a linearized form, as well as permanent speed droop (or speed regulation) and self-regulation coefficient. These travelling-wave solutions are then compared to numerical solution by the method of characteristics with close agreement in the results. This new analytical method is then used to study the influence of elasticity on maximum speed deviation and on the stability of oscillations and to define the limitation of a rigid-column analysis. For high-head plants, elasticity of the water and penstock walls increases maximum speed if governor settings are kept the same. The major influence of the elastic waves, however, is the reduction of the stability margin for the speed variation. Optimum governor settings will be, therefore, different from those obtained by neglecting elasticity of the water and penstock walls. / Applied Science, Faculty of / Civil Engineering, Department of / Unknown

Thesis (Ph. D.)--University of Wisconsin--Madison, 1957. / Typescript. Abstracted in Dissertation abstracts, v. 17 (1957) no. 10, p. 2235. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 147-152).

Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering. / Microfiche copy available in Archives and Engineering. / Bibliography: leaf 149. / M.S.

Made available in DSpace on 2014-06-11T19:30:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2003Bitstream added on 2014-06-13T18:59:52Z : No. of bitstreams: 1 perez_ep_me_guara.pdf: 1116117 bytes, checksum: 2ae25303ba483b9f7ccbf3d2f842125f (MD5) / A turbina Michell-Banki é basicamente uma máquina de ação, sendo que a característica mais importante das turbinas de ação é a não existência do tubo de sucção. A instalação do tubo de sucção numa turbina causa o aumento da queda disponível e como conseqüência, aumenta a potência gerada e a rotação da turbina. No presente trabalho propõe-se a instalação de um tubo de sucção numa turbina Michell-Banki, visando alcançar as melhorias já indicadas acima, lembrando que ao colocar o tubo de sucção aparece um grau de reação na máquina. Foi feito uma análise mecânica-hidráulica da turbina Michell-Banki proposta, com o objetivo de encontrar as equações que permitem calcular os diversos elementos da turbina. Desta maneira o trabalho apresenta uma metodologia para projeto de uma turbina Michell-Banki com tubo de sucção. Também são apresentadas as formas de traçar o rotor, o injetor e a pá diretriz. Finalmente o trabalho apresenta ainda as recomendações para a execução de projeto e construção da turbina. / The turbine Michell-Banki is basically an action machine, and the important characteristic of the action turbines is the no existence of the suction tube. The installation of the suction tube in a turbine increases the available fall and as consequence, it increases the generated power. The rotation of the turbine is also increased by increasing the available fall. In the present work it's proposed the installation of a suction tube in a Michell-Banki turbine, aiming to reach the improvements already indicated above, remembering that when placing the suction tube a reaction degree appears in the machine. It was done an mechanical and hydraulics analysis of the Michell-Banki turbine with the objective of finding the equations that allow to calculate the several elements of the turbine proposed, and thus presenting a methodology for project of a turbine. Finally I described the way of drawing the rotor, the injector and the guideline shovel, as well as it is also recommended the process that should be followed to build the turbine.

Orientador: Anselmo Eduardo Diniz / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica / Made available in DSpace on 2018-08-25T10:42:27Z (GMT). No. of bitstreams: 1 Lacerda_RafaelSegantin_M.pdf: 5082934 bytes, checksum: 9288c8f97c6d45416ba8bc96895fc01d (MD5) Previous issue date: 2014 / Resumo: A fabricação de pás de turbinas hidráulicas representa uma das atividades mais importantes no processo de fabricação do rotor de uma usina hidrelétrica e corresponde a uma parcela considerável do custo de produção do mesmo. Devido às características geométricas e requisitos hidráulicos destes componentes, as operações de fresamento em cinco eixos são altamente solicitadas e se destacam pela versatilidade e rapidez que proporcionam para o processo produtivo. Todavia, o fresamento de pás de turbinas hidráulicas apresenta alguns pontos críticos relacionados com a qualidade superficial, qualidade dimensional e os custos da operação de usinagem. A taxa de remoção de material, a variação das condições de fresamento diretamente relacionada com os parâmetros de corte e a necessidade de se reduzir os ciclos de produção são itens que fazem o estudo detalhado desta operação ter importância fundamental para a utilização das modernas tecnologias de usinagem. O objetivo deste trabalho é identificar as condições de corte mais adequadas para o processo de fresamento em cinco eixos de pás de turbinas hidráulicas. Para isto, o processo de fabricação foi monitorado e ensaios foram realizados para comparação entre diferentes estratégias de fresamento e parâmetros de corte. Durante estes ensaios observaram-se os parâmetros elétricos do motor da máquina e também a coloração dos cavacos, para estabelecer uma relação entre estes parâmetros e o real desgaste sofrido pela ferramenta, a fim de se ter um método direto e prático para definição de seu fim de vida. As principais conclusões deste trabalho são que a variável de entrada mais influente na vida da ferramenta dentre as testadas foi a estratégia de corte (concordante ou concordante / discordante) e para estas ferramentas, o desgaste de flanco (VB) foi o principal determinante para o fim de vida da aresta de corte. Em adicional, a observação da potência consumida e da coloração do cavaco realizada pelo operador, mostrou-se adequada para determinar o momento de troca da ferramenta neste tipo de fresamento em desbaste. Palavras chave: fresamento em cinco eixos, pás, turbinas hidráulicas e desgaste de flanco / Abstract: The manufacturing process of blades for hydraulic turbines is one of the most important activities to fabricate a runner for a hydraulic power plant and is responsible for a considerable portion of the production cost thereof. Due to the geometric characteristics and hydraulic requirements in these components, the milling operations in five axis is highly appreciated and offer the versatility and speed for the production process. However, the milling process for blades of hydraulic turbines present some critical issues related to the surface quality, dimensional quality and machining costs. The rate of material removal, the variation of milling conditions directly related with cutting parameters and the need to reduce production cycles are items that make a detailed study of this operation has high importance on the application of the most modern machining technologies. The objective of this work is to identify the most suitable cutting conditions for five axis milling in blades of hydraulic turbines. For this, the manufacturing process was monitored and tests were performed in order to compare different milling strategies and cutting parameters. During these tests was observed the electrical parameters of the machine motor and also the colors of the chips to establish a relationship between these parameters and the actual wear suffered by the tool in order to have a derictly and practical method to define the end of the tool life. The main conclusions are that the most influential variable in the tool life among those tested was the cutting strategy (Up Milling or Up Milling / Down Milling) and for these tools, the main determinant for the end of life is the flank wear (VB) of the cutting edge. In additional, the observation of the power consumption and the colors of the chips performed by the operator, with the goal of determining the exactly time to exchange the tool was adequate for this type of rough milling. Keywords: five axis milling, blades, hydraulic turbines and flank wear / Mestrado / Materiais e Processos de Fabricação / Mestre em Engenharia Mecânica

The study addresses the coating selection for a proposed placement of a hydroturbine into the Gulf Stream. The turbine will generate energy in a similar manner to a wind turbine. The effects of biofouling and corrosion in the current project are assessed. A review of different types of traditional paint coatings is given, as well as the option for a copper-nickel alloy. Testing that should be undertaken for the coating selection is described in detail. Coating considerations are offered and discussed. Design considerations and modifications are also offered. / by Andrew Spicer Bak. / Vita. / Thesis (M.S.C.S.)--Florida Atlantic University, 2009. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2009. Mode of access: World Wide Web.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1979. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Includes bibliographical references. / by Lee Wing Ho. / M.S.