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 25 for “"wave forces"”.
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Investigating Wave Forces on Coastal Bridge Decks
Tsunamis and hurricane induced waves are responsible for many coastal bridge failures, especially in the last decade. In the current study, three countermeasures (reducing the entrapped air, elevating the structures and rigidifying the structures) are considered, two wave types (solitary wave …
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Wave forces on submarine pipelines : a review
In Part I theoretical aspects of hydrodynamic forces on immersed solids are considered. Part II contains a chronological review of research projects, laboratory as well as ocean experiments, which have been carried out since 1950. In Part III the recommended procedures, which emerge from Part. II, …
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Wave forces on cylindrical piles and pile groups : a critical review
… is a critical review of methods of predicting wave forces on vertical piles or groups of piles. It assigns different force prediction theories to different situations or flow regimes and analyses their advantages and disadvantages. The thesis is split into two sections: Section I reviewing the …
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A strip theory approximation for wave forces on submerged vehicles in finite depth water
… largely due to a lack of knowledge of vessel forces in shallow water, especially in the presence of surface wave effects. The limitations of current control systems do not afford enough confidence to operate the vehicles in very close proximity to shore or in large waves because the control in …
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Dynamic Analysis Of Offshore Structures
… Analysis. The conventional one dimensional wave equation analysis of the pile driving problem suffers from the empirical representation of the soil parameters. In this study, an improved one dimensional wave equation model is developed which accounts for wave propagation in the soil mass and …
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Manoeuvring behaviour of ships in extreme astern seas
… incorporating memory effects in random waves with a new axis system that allows straightforward combination between seakeeping and manoeuvring model whilst accounting for extreme motions. A combination of seakeeping and manoeuvring is achieved through the adoption of relatively new …
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Modeling nonlinear stochastic ocean loads as diffusive stochastic differential equations to derive the dynamic responses of offshore wind turbines
… is developed for modeling stochastic ocean wave and wind loads as diffusive stochastic differential equations (SDE) in a state space form to derive the response statistics of offshore structures, specifically wind turbines. Often, severe wind and wave systems are highly nonlinear and thus …
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The development of a real-time wave energy device control algorithm based on artificial neural network
… controller to maximize the energy absorption of wave energy converter (WEC) in practical application. The controller maximizes the energy absorption by locking and releasing the WEC alternately, and such control is known as the latching control. The model predictive control strategy is used to …
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Waves Generated by Moving Vessels and Cnoidal Wave Interactions with Either a Partially-submerged Porous Barrier or a Mixed Partially-submerged and Submerged Dual Porous-Barrier System
… for estimating moving vessel generated maximum wave heights at Sabine–Neches Waterway in Texas. Using the recorded wave and vessels’ sailing data, the empirical approach with the calibration and validation procedures is carried out to confirm those models’ applicability. The performance of each …
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Some aspects of the analysis of offshore structures
… thesis, a study is made of the effect of random wave forces on self-supporting steel and concrete oil drilling platforms. Various methods of estimating the forces on the structure, and various ways of idealising both the forces and the structure itself, are compared, the - objective being a …
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Wave effects on underwater vehicles in shallow water
… is made more difficult by the effects of ocean waves. In deep water, most AUV missions take place at depths below the region of surface wave effects, but this is impossible in shallow (littoral) waters. At present, empirical control system parameters are altered for better shallow water …
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Structural Vulnerability of Coastal Bridges Under Hurricane Conditions
Hurricane waves can cause catastrophic damage to coastal bridges that lack sufficient clearance. This research focused on improving the understanding of the behavior of coastal bridges under hurricane-induced wave impact. High-fidelity finite element (FE) models were developed within ABAQUS, …
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Análise estrutural de risers para águas profundas
… behaviour and the calculation of current and wave forces are also studied. Based on these points, two computer programs were prepared, one for the static study and other for the dynamic study, and many cases of risers subjected to waves, currents and imposed displacements on the upper node …
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Análise estrutural de dutos submarinos durante a operação de lançamento
… adopted and the calculation of current and wave forces are also presented. The numerical methods for the solution of the problem and the corresponding algorithms implemented in the developed programs for the static and dynamic studies are fully described. Many cases or laying underwater …
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A scatter diagram approach to the selection of design currents for prediction of marine riser vortex-induced vibration
… the probability of various combinations of wave height and period, which are then used to assess wave forces. To predict VIV fatigue damage the designer needs to know which current profiles have the combined property of long regions of relatively constant velocity and relatively high speed. …
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Beach development and movement as a function of water waves
… study is made of available knowledge regarding wave theory and sediment transport in the nearshore zone, with special emphasis on littoral drift. The linear Airy theory for water waves is developed for the computation of longshore current, utilizing certain exact relationships for momentum flux. …
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Modeling a Semi-Submersible Floating Offshore Wind Turbine With Tuned Inerter Dampers Within the Platform
… system when it experiences large wind and wave forces that impact its performance and shorten its operating life. Researchers have been exploring structural control methods and creating modeling tools to evaluate the performance of the control methods. One such tool is OpenFAST, the …
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Three-Dimensional Nonlinear Dynamics of a Moored Cylinder to be Used as a Breakwater
… 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. The mooring lines are modeled as both linearly elastic ("regular") …
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Attitude control of an underwater vehicle subjected to waves
… a method for estimating the spectra of water wave disturbances on five of the six axes of a stationary, slender body underwater vehicle in an inertia dominated wave force regime, both in head seas and in beam seas. Inertia dominated wave forces are typical of those encountered by a 21 inch …
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Time domain mathematical model for six-degree-of-freedom motion in a wave
… a six-degree-of-freedom motion of a ship in a wave. This integrated mathematical model is developed with its fundamental base on both traditional seakeeping and manoeuvring theories and thus obtaining of hydrodynamic data sets as well as formulation of force component are needed in a …
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