Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"Engenharia oceânica"”.
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Avaliação da pressão de colapso de dutos submarinos com danos
The present work is related to collapse pressure and buckle propagation of dented pipelines installed in deep waters. Numerical models based on finite elements method and small-scale buckle propagation tests in dented samples were performed. These models and experimental tests have taken into …
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Simulação do colapso progressivo da seção mestra de um navio militar devido à flexão longitudinal
The necessity of safeguarding the rights and exercising Brazil's obligations at sea, on the continental shelf and its extension (Blue Amazon), generates the need to design and obtain efficient and reliable combat platforms, which are described in the National Defense Strategy (NDS). Aiming at …
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Confiabilidade e política de manutenção aplicadas a sistemas de máquinas de plataformas offshore
The work consists in the determination of maintenance tasks that must be scheduled and carried out, based on the study and analysis of the history of failures and repairs of machine systems, considering a reliability study. The objective is to be able to establish the maintenance policies …
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Sistema autônomo tri-banda de aquisição e armazenamento de dados para caracterização de paisagem acústica submarina
This work presents a study of the acoustic landscape of the oceans, focusing mainly on the understanding of the acoustic signal physics in the marine environment, how to measure it and characterize some sources, such as mammals and ships. Knowing the signal to be measured, an autonomous data …
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Análise modal operacional de uma bomba centrífuga submersa utilizando a decomposição melhorada no domínio da frequência
The identification of modal parameters of electrical submersible pumps (ESP) is part of the process of increasing the reliability of this equipment, which is installed in places that are inaccessible, from a maintenance point of view, for oil exploitation, such as offshore oil wells and seabed, so …
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Análise da navegação com ECDIS (sistema de apresentação de cartas eletrônicas e informações) utilizando conceitos de engenharia de resiliência
The Electronic Chart Display and Information System (ECDIS) has become a key element in ships' bridge and it is of great importance for the officer to interact well with the system to maintain safety of navigation. The objective of the study is to analyze the shared cognitive system between the …
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Evolução das tensões residuais e sua relação com a “misorientação” microestrutural de um aço astm dh36 após soldagem
The residual stress is an important parameter to be studied in order to guarantee reliability and resistance of the structures and to avoid their future failures. A particular phenomenon about residual welding stress changes over time has recently been observed with the residual stress evaluation …
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Efeitos de obras hidráulicas na renovação das águas do Sistema Lagunar de Jacarepaguá e na balneabilidade das praias adjacentes ao canal da Joatinga
Since the 1970s, the waters of the Jacarepaguá’s System have received large and growing loads of wastewater, rich in organic matter, from urban and industrial sources. This work evaluated, through computational modeling, the effects that hydraulic works in the lagoon system would induce in the …
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Impacto de modelos alternativos de uso de rebocadores portuários no aumento da capacidade de navios
This work aims to present an innovating and alternative methodology of use of harbour tugs in assisting the ships’ maneuvers in ports, with the primary purpose of reducing the ship’s transit speed in the access channels to ports and terminals. This reduction of ship’s speed has the consequence of …
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Cilindro espesso curvo submetido a carregamentos combinados no plano de momento fletor, força normal e força cisalhante
Thick-walled curved cylinder, most used in oil and gas industry, is one of the most important component of the connector used to make and maintain a connection between flexible flowlines and subsea equipment. However, there is no a standard acceptance criteria for evaluation excessive yielding …
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Estudo sobre a ocorrência de ressonâncias paramétricas numa plataforma TLWP próxima a um FPSO em ondas irregulares
The present dissertation is a continuation of studies done on observed phenomena during experimental tests of a TLWP platform coupled with a FPSO. The tests were performed on scaled models. The results from regular sea states show that the system presents excessive amplifications for a band of wave …
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Modelo numérico de efeitos hidrodinâmicos em escoamentos internos e externos
This work develops a numerical model for external and internal flows to a ship under regular waves. The numerical model consists of the coupling of two methods with different nature, which were evaluated independently in a first stage. The first one is the time domain method based on the panel …
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Resistência última de navios e plataformas danificados por colisões
Extreme events may lead to a structural element experiencing a loading scenario above a critical limit known as ultimate strength. This structural failure, in some cases, can develop into the progressive collapse of other structural elements and generate catastrophic consequences. Offshore …
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Otimização estrutural de tetos flutuantes tipo pontão
Storage tanks are logistically important in oil processing units. One of the most widely used types of storage tank is the vertical cylindrical tank with external floating roof. Thin steel plates form these structures, which float directly on the product stored in the tank. There is not much design …
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Avaliação da influência do acoplamento de risers no movimento de jogo de um FPSO
This work presents a comparison between the coupled and uncoupled formulations for computational simulation and analysis of the roll motions of an FPSO attached to a set of flexible risers in a deep-water scenario. The evaluation of the motions of the hull and the structural dynamic behavior of the …
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A study on green water problem with dam break model and the BIV technique
The green water generated by extreme waves is primarily an air-water mixture, which includes a continuous phase and a dispersed phase. The continuous phase is explored with the dam break model by three main approaches, namely analytical, experimental and numerical. Analytically, both the Eulerian …
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Análise das variações morfodinâmicas por funções ortogonais empíricas - Praia do Flamengo (RJ)
Flamengo Beach has been modified because of the land reclamation which resulted in the advancement of the original coastline, and may be exposed to beach erosion. This research is motivated to know the morphodynamics of this beach in order to provide information for making decision in the coastal …
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Reliability evaluation for a subsea to shore production system
In the offshore industry, the reliability of installed equipment is of paramount concern due to operational safety, environmental impact, and economic consequences. The costs of unplanned shutdowns and maintenance have also high economic implications. This thesis focuses on system reliability …
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Movimentos induzidos por vórtices (VIM) de plataformas TLWP submetidas a correntes de alta intensidade
Vortex Induced Motions (VIM) classified as galloping occurs frequently in TLWP Platforms, however these movements are not always correctly taken into account during design phases. This work aimed to develop a formulation that represent this kind of movement for sway and yaw degrees-of-freedom. …
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Modelagem de fratura dúctil em colisão de embarcações utilizando modelo de dano de Lemaitre modificado
Over the last 20 years, the study of accidents involving ship collisions and strandings has led to the development of different methodologies, and to simulate numerically the material’s ductile fracture, several failure criteria have been applied. With this perspective, thi3s article considers a …
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