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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 62 for “"Sea-State"”.
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Neural network based simulation of sea-state sequences
… and mean zero-up-crossing period ( ) of 3-hourly sea-states of a location in the North East Pacific using a proposed distribution called hepta-parameter spline distribution for the conditional distribution of Hs or given some inputs. Two different seven- network sets of ANNs for the simulation and …
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Characterization of a Sea-State Simulator for Ergonomic Studies
… to determine the response of ships to various sea-state conditions far in advanced of their construction and launch. However, this data does not indicate the effects of those sea-states to the individuals aboard that ship. In order to define these effects a sea-state simulator must be designed …
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Collaborative control of wave glider platforms - Local Communication and Sea State Estimation
… of many oceanography and marine engineering researchers, with possible links between climate change and the carbon cycle in the Southern Ocean being considered. This type of investigation requires modern and cost-effective tools to conduct surveys and collect data from the ocean. The …
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Sea state estimation from inertial platform data for real-time ocean wave prediction
… activities are mainly carried out on large research vessels chartered for weeks at a time, which can be extremely costly. In addition, the data obtained when using these vessels are only short snapshots of the continual processes that occur. Recently, there has been a drive toward using …
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In-situ characterization of sea state with improved navigation on an Autonomous Underwater Glider
… capability to capture scientific data at the air-sea interface. Particularly of interest is the marginal ice zone (MIZ) in the Arctic and the Southern Ocean, as both are vitally important to understanding global climate trends, yet prohibitively expensive to persistently monitor with support …
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In-situ Characterization of Sea State with Improved Navigation on an Autonomous Underwater Glider
… capability to capture scientific data at the air-sea interface. Particularly of interest is the marginal ice zone (MIZ) in the Arctic and the Southern Ocean, as both are vitally important to understanding global climate trends, yet prohibitively expensive to persistently monitor with support …
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Sea-state interaction based dynamic model of the Liquid Robotics' Wave Glider: Modelling and control of a hybrid multi-body vessel
A new class of unmanned marine research vessels makes use of wave propulsion to minimise energy requirements during voyages. Existing models of these hybrid sea-surface and underwater craft have not considered if the platform’s interaction with the immediate surrounding sea could be incorporated to …
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Estudo sobre a ocorrência de ressonâncias paramétricas numa plataforma TLWP próxima a um FPSO em ondas irregulares
… on scaled models. The results from regular sea states show that the system presents excessive amplifications for a band of wave periods and heights in the yaw direction. These phenomena were studied by Cruz (2010) and Rivera (2012). Rivera showed that the unstable behavior is caused by …
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Energy transfer from wind to waves
… be appropriate. This profile is related to the sea state, through two approaches, thus enabling the growth rate function from the analytical model to be linked to the sea state. The growth rate function obtained from the analytical model, using this profile, is found to be comparable to that …
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Microseism analysis during extreme weather events: Medicanes case studies and development of sea state monitoring system based on machine learning algorithms [Analisi del Microseism durante eventi meteorologici estremi: Medicanes casi studio e sviluppo di un sistema di monitoraggio dello stato del mare basato su algoritmi di Machine Learning]
… altezze significative delle onde. Inoltre, sono state stimate i trend a lungo termine del contenuto energetico del microseism e del wave power relativo alle onde del mare per dimostrare come il microseism possa essere utile anche nell'analisi delle caratteristiche delle onde marine sul lungo …
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Development and Validation of Feature-Based Vision Algorithms for Autonomous Ship-Deck Landing
… image. Experimental validation was performed for Sea-state 6 ship-deck motion simulated using a Stewart platform. Additional experiments were performed for visually-degraded conditions, including occlusion, glare, and low illumination, and free flight. The results indicated that while the …
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Investigating the effects of maintenance and environmental conditions on the operational efficiency of ships by analysis on the real operational data
… of fouling and environmental conditions such as sea state and sea direction. The Energy Efficiency Operation Indicator (EEOI) and main engine fuel consumption per nautical miles (T/NM) are considered as efficiency Key Performance Indicators (KPIs). This research's aim is to analyse of fuel …
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Quantifying Extreme Event Statistics for Ship Motions and Loads Using Low-Fidelity Models and Recurrent Neural Networks
… rely on precalculated polar plots during heavy seas to select speeds and headings that will protect the ship and crew from dangerously extreme pitch and roll motion. Ship designers use simulations over thousands of operational hours to predict the effects of vertical bending moment on the …
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Transporte de estruturas offshore sobre balsa
… 5 sets of barge/structure in 2 headings and 15 sea states. The results from a flexible barge analysis and from a rigid barge analysis were compared. Also the critic sea state mean period was determined. At the end, some considerations related to the dynamic structural analysis necessity are …
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The response to ship motions of towed vehicles for use as oceanic microstructure measurement platforms
… mode as a result of being towed by a typical research vessel in a sea state three.
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An investigation of momentum exchange parameterizations and atmospheric forcing for the Coastal Mixing and Optics Program
… underestimate the momentum flux into developing seas. To account for wave-induced processes and yield improved flux estimates, modifications to the traditional flux parameterizations are explored. Modification to the bulk aerodynamic method involves incorporating sea state dependence into the …
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An investigation of momentum exchange parameterizations and atmospheric forcing for the Coastal Mixing and Optics Program
… underestimate the momentum flux into developing seas. To account for wave-induced processes and yield improved flux estimates, modifications to the traditional flux parameterizations are explored. Modification to the bulk aerodynamic method involves incorporating sea state dependence into the …
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On finite difference solutions for the ocean wave spectrum in regions of non-uniform water depth
… is concerned with the determination of the sea state in terms of wave spectra. The phenomenon was calculated for two different bathymetries. The purpose is to develop a finite difference method with an upwind differencing scheme to g solve several formulations of the wave action conservation …
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Analysing modelled nearshore wave climate variability and change as relevant to the traditional handline fishery of the South African South Coast
… While fishers have noted that deteriorating sea state and a declining number of sea days caused by shifts in wind patterns are affecting their livelihood, applicable scientific research and data on scales relevant to the fishers is insufficient. Insight into the complexities involved in …
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The design of a surface launch and recovery fender for DSRV "Alvin"
… of these two vessels in recovery position in a sea state 6, that any such bumper or combination of bumpers (i.e. bumper on LULU) would have to absorb 10,000 ft.-lbF., of energy. In order to protect the mechanical arm, keep the forces of collision at an acceptable level and retain present surface …
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