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Showing 1 to 20 of 55 for “"Risers"”.
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Análise global-local de "risers" flexíveis
… mechanical behaviour of multi-layered flexible risers intended for offshore oil explotation is presented. A quasi-static geometric nonlinear analysis of the planar behaviour of these componentes is carried out for operational scenarios, considering long period excursion of a floating platform. …
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Análise estrutural de risers para águas profundas
… the dynamic and static analysis of deep water risers, taking into account many of the characteristics that are specific for this kind of structure. The theory, the brief deduction of the element matrices and the proceedings adopted are presented here. The influence of weight, internal fluid and …
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Ductile fracture and structural integrity of pipelines & risers
… global increase of energy demand. Pipelines and risers are key components for the production and transportation of oil and gas both in the offshore and onshore environment. The structural integrity and fracture control of pipes, which are major components for the exploration, production and …
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Equilíbrio e vibrações induzidas por vórtices de "risers" de perfuração
Presents a study about drilling risers used by semisubmersible platforms in order to drill wells in deep waters. Firstly, a study about static equilibrium is presented. This allows to select adequate risers for places with usual natural conditions. The selection takes into account the riser …
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EMAT-based diagnostic technique with applications to substation ground mat risers
Includes bibliographical references (page 99).
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Local plastic deformation in pressure and tensile armour layers of flexible risers
<p>Flexible pipes are commonly used for connecting seabed flow-lines to floating production facilities. The general riser design consists of an internal carcass for collapse resistance, a polymer fluid barrier, carbon steel interlocked circumferential pressure armour layer for resisting internal …
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Weight-optimised steel catenary risers and their applications in harsh deepwater environment
… and deeper water environments. Steel catenary risers (SCRs) are being considered used in conjunction with a semi-submersible in deepwater and harsh environments such as Northern North Sea, which presents significant design challenges. To increase the understanding of SCR behaviour and improve …
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Análise probabilística da falha por colapso de risers e dutos submarinos corroídos
Oil and gas offshore pipelines are one of the main components of a subsea system. . In this scenario, many companies have changed their procedures to ensure the structural integrity of their pipelines - from a model that incorporates empirical safety factors and periodic inspections to another, …
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An initial design procedure for the motion analysis of flexible marine risers
Thesis: M.S., Massachusetts Institute of Technology, Department of Ocean Engineering, 1987
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Vortex-induced motions of marine risers : straked force database extraction & transient response analysis
… on a model riser that lock-in of long flexible risers placed in sheared or uniform cross-flows is a much richer phenomenon than lock-in of flexibly-mounted rigid cylinders under similar conditions. In particular, we find that the frequency content of the riser response may be either …
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The effects of staggered buoyancy modules on flow-induced vibration of marine risers
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
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High frequency dynamic response of marine risers with application to flow-induced vibration
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2001.
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Avaliação da influência do acoplamento de risers no movimento de jogo de um FPSO
… 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 subsea lines are usually made in different steps of the design, so that the dynamic interaction between the two physical domains is …
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Pré e pós-processamento gráfico para análise global de risers e linhas de ancoragem
… applied to 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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FRAES - Protótipo de sistema especialista para análise do comportamento mecânico local de risers flexíveis
… flexible pipes which can be used as risers in offshore applications. It concerns primarily about the behaviour of the internal structure of the pipe. A theorethical approach allows to establish the stresses, strains and contact pressures between layers due to axisymmetrical loads and …
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Theoretical and experimental procedures for the prediction of the dynamic behavior of marine risers
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1983.
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Vortex-induced vibration of marine risers : motion and force reconstruction from field and experimental data
… in-situ estimation of fatigue damage on marine risers; improve understanding of the vortex shedding mechanisms, including the presence of traveling waves and higher-harmonic forces; and estimate the vortex-induced forces on marine risers. In the second part of the thesis, a method is developed …
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Effects of broad-banded higher harmonics on fatigue damage of risers due to vortex-induced vibrations
Recent works have discussed "chaotic" or "Type-II" riser motion and suggested that it is a general feature of VIV riser response. Chaotic riser response contains broad-banded harmonics and a combination of standing and traveling waves, unlike periodic or " Type-I" motion which contains only …
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Learning hydrodynamic coefficient databases for vortex induced vibration prediction of marine risers using sparse sensor measurements
Semi-empirical models are currently the state-of-the-art technology for flexible cylinder vortex induced vibrations (VIV) predictive modelling. Accurate prediction of the structural response relies heavily on the accuracy of the acquired hydrodynamic coefficient database. Due to the large number of …
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Modeling the effects of Reynolds number and added mass on the vortex-induced vibration of drilling risers
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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