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 38 for “"Catenary"”.
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Modeling and simulation of pantograph-catenary systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1984.
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The design of a deep water catenary riser
… The proposed design is based upon a steel catenary riser which will connect an FPSO directly into either a wellhead or seabed pipeline system thereby eliminating both the connection complexes and high cost associated with a central manifold. The catenary geometry will ensure that the …
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Development of improved solutions for steel catenary riser challenges
… for this purpose. The conventional steel catenary risers (SCR) are limited in their application for deep and harsh water environments due to the high stresses and fatigue response at their critical sections. In line with the aim and objective of this research, riser solutions for SCR are …
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Modeling and dynamics of pantograph/catenary systems for high speed trains
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1983.
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The effects of bending stiffness on the dynamics of catenary cables
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Weight-optimised steel catenary risers and their applications in harsh deepwater environment
… in deeper 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 …
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Downhole Automation Using Spline, Catenary and Clothoid Curves Based on Minimum Wellpath Energy
… curves are coupled in wellpath design. Catenary, spline and clothed curves supply curvature bridging in transition zones as they make wellpath smooth. Several survey points will be set to check coordinates of bit moving. Balanced average method, minimum curvature, and natural curve model …
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Simulation of the catenary effect under wind disturbances in anchoring of small boats
… for as long as ships have existed that the catenary effect of an anchor line augments the efficiency of an anchoring system. This is achieved by making the anchor line as heavy as possible thus lowering the effective angle of pull on the anchor. This notion has, however, come under criticism …
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Weathering and soil properties on catenary sequences in forest and alpine ecosystems of the central Rocky Mountains
… be evaluated by studying soil properties along catenary sequences—soil sequences that are hydrologically and topographically connected along hillslopes from higher elevation to lower elevation. Using the catena model, I investigated the manifestation of soil forming factors in conditioning …
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Local variability in early Oligocene paleosols as a result of ancient soil catenary processes, Brule Formation, Toadstool Park, Nebraska
Paleopedology is often employed in paleoenvironmental reconstructions because the features of paleosols are affected by changes in climate, ecology, topography, and lithology over time. These changes cause small-scale variations in the morphology and apparent development of paleosols and influence …
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Learning hydrodynamic coefficient databases for vortex induced vibration prediction of marine risers using sparse sensor measurements
… flow (iii) straight riser in sheared flow (iv) catenary riser in uniform flow of various incidence directions between the catenary plane and the incoming flow stream (v) stepped (2-diameter) riser in uniform flow. The predicted amplitude and frequency responses, using the extracted databases, …
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Análise de estruturas marítimas e sistemas flexíveis constituídos por cabos
… arrays, by using the finite element method. A catenary cable element is employed. A computer program has been developed, using FORTRAN language and implemented in the system Burroughs B6700. This program allows statics analysis, free vibration, and dynamic analysis by modal superposition or …
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Análise estática não-linear de estruturas marítimas estaiadas em microcomputadores
… theory of beams and on a nodal yelding criteria. Catenary equations are used to predict the cable stiffnesses. Routines for hydrodinamic forces were also added. Linear Airy theory is used to compute wave verocity and acceleration. Induced loads on members due to waver and current action are …
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Stability problems in constrained pendulum systems and time-delayed systems
… lumped parameter model for small vibrations of a catenary. Our work confirms the existence of asymmetric stable equilibrium configurations for a symmetric system. The problem of determining the critical distance for instability between two supporting points of a catenary has potential application …
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Aurora: Lunar Surface Power Plant
… systems, non-pressurized shielding using catenary-ruled structures fabricated from lunar regolith, and a five-phase concept of operations for deployment, construction, operation, and decommissioning. Using a top-down systems engineering framework, the research develops practical design …
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The 4-dimensional masonry construction
… the constraint of structural geometries (catenary systems and double curvature for lateral stiffness), the techniques of graphical analysis to define such a structure spatially, and the logic of sequencing to maintain the units' systematic relation, to constrain units inherently given to …
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Hydrodynamic analysis of the offshore floating nuclear power plant
… to further 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 …
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Automating the Generation of Geometric Information Models to Support Digital Twinning of Existing Rail Infrastructure
… comprising railway track structure and overhead catenary system elements in an established data format [i.e. Industry Foundation Classes (IFC)]. The research provided in this thesis first automatically and effectively segments labelled point clusters of railway elements in point cloud data. It …
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Numerical analysis of cables in the offshore environment
… the developed. Convergence difficulties basic catenary, have been at start-up, caused by a lack of stiffness in the transverse direction, are avoided by supporting the cable when applying loads. It is further established that numerical analyses of flexible structures are most stable in dynamic …
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Vortex-induced vibration of slender structures in unsteady flow
… employ curved slender structures such as steel catenary risers in deep-water offshore oil systems. The top-end vessel motion causes the slender riser to oscillate, creating an unsteady and nonuniform flow profile along the riser. The purpose of this research is to develop a VIV prediction model …
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