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 24 for “"mooring lines"”.
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Non-linear dynamics of mooring lines
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997.
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Mooring lines analysis and design for wave energy converters
… mainly by colliding waves. Therefore, their mooring system is a fundamental component, which inuences overall performance characteristics through its dynamic behaviour.;The mooring component of wave power devices has been typically analysed and designed by using a simplified static and …
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Three-Dimensional Nonlinear Dynamics of a Moored Cylinder to be Used as a Breakwater
… could be positioned in series to protect shorelines, harbors, or moored vessels from destructive incident water waves. The cylinder is positioned with its axis horizontal and is moored to the seafloor with four symmetrically placed massless mooring lines connected at the ends of the cylinder. …
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Investigation Into Snap Loading of Cables Used in Moored Breakwaters
… configuration to investigate snap loads in mooring lines. Breakwaters are structures used to attenuate or eliminate waves and protect shorelines, harbors, and other natural and man-made marine structures from wave damage. The breakwater in this investigation is modeled both as a point mass …
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Dynamic analysis of a spar-type offshore floating wind turbine and its mooring system
… by a spar platform and held in place with three mooring lines. It is important to study the dynamic responses of the floating platform and the mooring system behaviour so that the OFWT can be designed and constructed safely and economically and generate electricity with reliability. However, …
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Análise dinâmica comparativa de linhas de ancoragem nos domínios do tempo e frequência
This work deals with the dynamic behaviour of mooring lines at deep water on open sea. Initially are shown two dynamic response calculations approaches, based on the problem solution in the time domain and frequency domain, and procedures for fatigue damage determination. Parametric studies were …
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Three-Dimensional Analysis of Moored Cylinders Used as Breakwaters
… ocean floor with six symmetrically configured mooring lines. The cylinder is filled with air and the mooring lines remain taut during the structure's motion. Six degrees of freedom describe the motion of the breakwater and additional degrees of freedom are introduced as the cables are modeled …
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Innovative Floating Wind Turbine with Synthetic Mooring System and Feasibility Analysis of a Solar-Wind-Battery Hybrid System
Synthetic mooring lines, characterized by their neutral buoyancy and high strength, are crucial for maintaining the station-keeping of Floating Wind Turbines (FWTs) by providing the necessary restoring forces while minimizing the vertical loads on the platform. This thesis explores the evolution of …
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Pré e pós-processamento gráfico para análise global de risers e linhas de ancoragem
… offshore structures, mainly flexible risers and mooring lines, which are extensively used by PETROBRAS. As a result, two computacional systems providing for the pre and post processing of the ANFLEX [ 2,3 ] program, for analysis flexible risers, were implemented.
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Flexible dynamics of floating wind turbines
… consisting of a tower, a floating platform and a mooring system. In this multi-body, linear frequency-domain model, the tower is represented as a series of uniform Timoshenko beams connected to each other. The deflections of the tower are solved analytically in each beam while the mass, damping …
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Hydrodynamic analysis of the offshore floating nuclear power plant
… improve hydrodynamic performance. A catenary mooring system was designed and analyzed for both plant models. The number of chains and the length of each were selected to ensure the mooring systems would withstand, with sufficient margins of safety, the maximum tension produced in a 100-year …
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A CFD study of fluid-structure interaction problems for floating offshore wind turbines
… blades and the floating platform with its mooring system interact with each other in wind and waves, which makes old design tools inadequate.;This work aims to develop a fully coupled high-fidelity aero-hydro-mooring-elastic analysis tool, and to better understand the sophisticated …
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Open ocean fish cage and mooring system dynamics
… industry. To design and evaluate fish cages and moorings for the energetic open ocean requires a systematic approach utilizing physical and numerical modeling techniques. Using these methods, two robust fish cage and mooring systems were designed, deployed and have survived two New England …
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Mathematical and computational modelling for the design of pipe bends and compliant systems
… might lead to potentially dangerous loads in the mooring lines or excessive displacements. Throughout the dynamics work stable steady state paths are closely followed and monitored so that any resulting bifurcation, including the possibility of chaotic behaviour, can be analysed with a view to its …
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Analysis and design of wave scattering by weakly non-uniform waveguides
… properties of the cross section of pipelines, risers and mooring lines such that vibration transmission is minimized. The objective of this thesis is to understand how to tune the medium small irregularity such that the interaction of the incident wave field with the medium irregularity …
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Exploring low-cost deep ocean sensing utilizing undersea cable networks
… taking point measurements or sets of fixed mooring lines along a continental shelf. Underwater telecommunications cable repeaters offer nodes of power and data transmission across the ocean every ~60 km. From a systems perspective, we are operating in the very first stage of a project life …
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A new method of termination for heavy-duty synthetic rope fibres
… for lighter ropes with better performance in mooring lines have encouraged industry to look for new methods for increasing line performance using existing ropes. One way of increasing rope performance is to use efficient methods for rope termination. This is why the main objective of this …
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Drag coefficient and damping of moorings and their effect on FPSO's response
… effective and economical. Damping effect of moorings and risers is especially important to surge excitation of the FPSO vessel due to its lowdamped characteristic and hence coupled analysis is normally preferred to accurately predict the floater motions as well as the mooring and riser system …
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A hydrodynamic analysis of deep-water moorings
… to deep water has an impact on the selection of mooring system configuration and design method. Methods of analysis need to be re-evaluated as water depth increases. The primary purpose of this thesis is to study the hydrodynamics of deep water moorings and the nonlinear dynamic response of the …
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In Situ Diagnostics for Multiple Allergens in Food
… of floating turbines, which are held in place by mooring lines with anchor foundations in the seabed. As a result, the development of anchor foundation concepts, which can resist large vertical and horizontal loads have become a focus of research in recent years. Due to the varying ground …
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