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 28 for “"Offshore platforms"”.
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Structural evaluation of fixed offshore platforms
In fixed offshore structures, damage incurred below the waterline is often difficult to detect, but significant enough to be the source of a subsequent massive failure. A technique is described that can be used to detect subsurface structural failure by detecting changes in the natural frequencies …
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Decision-support for decommissioning offshore platforms.
An estimated 2,500 offshore decommissioning projects are expected to be completed between 2018 and 2040 with significant accompanying challenges. In this research, a decision model for decommissioning offshore platforms is developed. The decommissioning decision model (DDM) aids logical …
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Structural evaluation of fixed offshore platforms
Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Ocean Engineering.
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Visualization of vibration experienced in offshore platforms
… VIV is vibration experienced by marine risers in offshore drilling platforms due to ocean current flows, and appears to be perpendicular to the direction of such flows. VIV causes oil companies large capital losses, supply chain disruption, and environmental and brand name damage. For these …
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Marine Communities of North Sea Offshore Platforms, and the Use of Stable Isotopes to Explore Artificial Reef Food Webs
… where they have been seldom applied.<br/>Offshore oil and gas platforms in the North Sea are artificial reefs, hosting<br/>substantial assemblages of sessile invertebrates and other associated fauna, and<br/>attracting large numbers of fish and motile invertebrates. Structural survey …
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A Stress Analysis of Circular Cylindrical Shell Intersections, Including the Influences of Reinforcement, Cyclic Plasticity and Fatigue
… or pressure vessels, pipe intersections in offshore platforms etc. The region of intersection presents a sharp geometric discontinuity in the structure which produces a stress field with very high stress concentration.
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Design for safety framework for offshore oil and gas platforms
… safety” based risk assessment technique for the offshore platforms in order to facilitate decision making. This is achieved through detailed examination of related risks, and review of relevant literatures and traditional safety assessment methods leading to the development of a new …
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Geração automática de dados para projeto e análise de plataformas “offshore”
… language, directed to design and analysis of offshore platforms. Structural modeling includes the jacket, main and skirt piles, deck legs and conductor pipes. Platform topology specification is given by general parameters and typical bracing patterns, defined by catalogued superelements. The …
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Computation of nonlinear hydrodynamic loads on floating wind turbines using fluid-impulse theory
… the more viable sources of renewable energy and offshore wind turbines represent a promising technology for the cost effective harvesting of this abundant source of energy. To capture wind energy offshore, horizontal-axis wind turbines can be installed on offshore platforms and the study of …
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Análise dinâmica não linear da interação solo-estrutura em plataformas marítimas
… analysis of soil-structure interaction in offshore platforms, during its installation and operation. Hence, it was developed a numerical model to allow the representation of the soil fundamental plastic and rheological properties. This model also enhances the utilization of complete …
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Análise dinâmica e cálculo da fadiga de estruturas de plataformas marítimas
… in the fatigue damage corresponding to fixed offshore steel structures when there are changes in analysis parameters. The dynamic behaviour for structures similar to those of real offshore platforms is determined using the Finit Element Method, by means of computer programs for dynamic …
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A técnica da linearização equivalente no cálculo da resposta permanente de plataformas marítimas fixas
… to obtain the steady state response of fixed offshore platforms under cyclic loads. The linearization is applied to local non linearity arising from hysteretic soil structure interation in such a manner that the non linear dynamic system is replaced by an equivalent linear one. Therefore the …
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Design of miniature floating platform for marginal fields
… the design of a novel type of miniature floating offshore platforms with a heave plate attached at the keel, suitable for developing deep-water marginal fields. This design features a small displacement, easy fabrication, reduced cost and a favourable motion performance in waves. The design …
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Análise da resposta dinâmica de um modelo em escala reduzida de plataforma offshore do tipo T.L.P.
… models to be used in designing this type of offshore platforms.
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Modelo simplificado para análise de lançamento de estruturas offshore tipo jaqueta
ln the analysis of Fixed Offshore Platforms, usually the study of the launching process is performed on the final pass of the project. The standards do not stablish the conditions for this analysis. Thus the designer should proceed is based on his own experience and/or in model test results. The …
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Optical Path Length Multiplexing of Optical Fiber Sensors
… application in automated factories, mines, offshore platforms, air, sea, land, and space vehicles, energy distribution systems, medical patient surveillance systems, etc. Optical path length multiplexing (OPLM) is a modification to traditional white-light interferometry techniques to …
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Interação solo-estaca de plataformas offshore
… to represent soil in the Structural Analysis of Offshore Platforms. The soil characteristics for the non-linear soil behaviour are obtained from laboratory tests or using full scale loaded piles. The API Code through the "P-Y" curves, defines the stress-strain soil characteristics for laterally …
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Seafloor anchoring for platforms in the Messina Strait
… is key to reliable techniques for floating offshore platforms including power generation from marine currents. Numerous studies have demonstrated how the uplift capacity of embedment anchors is highly dependent on the soil properties and the anchor geometry. This work focuses in detail on …
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Simulation of vortex induced vibration of a bluff body structure
… used in oil extraction from the seabed to the offshore platforms were exposed to external flows that may trigger dangerous VIV oscillations. The present two-dimensional numerical simulations of circular bluff body is a continuation of previous efforts trying to study the effect of frequency and …
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System identification of dynamic structural systems using continuous-time domain methods
… difficult to measure. An example is the case of offshore platforms subjected to sea waves. The study considers the inverse problem from the viewpoint of continuous-time linear dynamic systems. An existing structural identification technique defined for the deterministic case (when the loading is …
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