Browsing Institutt for marin teknikk by Title
Now showing items 2958-2977 of 3421
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Steady-state sloshing in an orbitally-forced square-base tank
(Journal article, 2019)The paper conducts a series of analytical studies on the resonant steady-state sloshing in a rigid square base container, which have been originated by Faltinsen & Timokha who derived and applied the Narimanov-Moiseev—type ... -
Steel weight optimisation with respect to stiffener spacing and plate thickness of mid ship structure for cargo vessels
(Master thesis, 2013)When building a ship, the weight and cost are important factors. By reducing weight there will be more cargo capacity which ensures the income for the ship owner. On the other hand, creating light weight structure often ... -
Stochastic analysis of Workover Risers
(Master thesis, 2010)The goal of this thesis is to investigate the properties of dynamic analysis of slender, top tensioned risers when using both regular and irregular waves. The goal was to discover properties in the response that correlates ... -
Stochastic bivariate time series models of waves in the North Sea and their application in simulation-based design
(Journal article; Peer reviewed, 2019)In this paper, we present and evaluate three long-term wave models for application in simulation-based design of ships and marine structures. Designers and researchers often rely on historical weather data as a source for ... -
Stochastic dynamic analysis and reliability evaluation of the roll motion for ships in random seas
(Doctoral thesis at NTNU;2016:224, Doctoral thesis, 2016)Large amplitude roll motion in realistic seas is a serious threat to ship stability because it can lead to damage or even capsizing of the vessel. For the excessive roll motion in random seas, the nonlinear effects and ... -
Stochastic Dynamic Analysis of Offshore Bottom-Fixed Structures
(Master thesis, 2015)Paper 1 The first part of this master thesis presented in paper one, is evaluating several methods to estimate dynamic amplification of drag dominated structures. This is done primarily by 3 hour time-domain analysis in ... -
Stochastic dynamic load effect and fatigue damage analysis of drivetrains in land-based and TLP, spar and semi-submersible floating wind turbines
(Journal article; Peer reviewed, 2015)This paper deals with the feasibility of using a 5 MW drivetrain which is designed for a land-based turbine, on floating wind turbines. Four types of floating support structures are investigated: spar, TLP and two ... -
Stochastic Dynamic Response Analysis of Spar-Type Wind Turbines with Catenary or Taut Mooring Systems
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:8, Doctoral thesis, 2011)Floating wind turbines can be the most practical and economical way to extract the vast offshore wind energy resources at deep and intermediate water depths. The Norwegian Ministry of Petroleum and Energy is strongly ... -
Stochastic dynamic system analysis of wave energy converter with hydraulic power take-off, with particular reference to wear damage analysis
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:102, Doctoral thesis, 2011)The study of the renewable energy has drawn increasing attention in the recent years. Wave energy with its relatively high power density is a major resource that has remained untapped until recently. Different types of ... -
Stochastic modelling of cross-flow vortex-induced vibrations
(Journal article, 2017)Semi-empirical models are commonly used to predict vortex-induced vibrations (VIV). Empirical parameters are often based on forced harmonic motion tests of short rigid cylinders in one degree of freedom, which is a significant ... -
Stochastic Mooring Analysis of Aquaculture Installations
(Master thesis, 2017)The aquaculture industry is experiencing rapid growth, which encourages moving the installations to more exposed sites, with harsher environmental conditions. With more exposed sites comes stricter structural requirements, ... -
Stochastic Response Analysis of Mooring Systems with Emphasis on Frequency-domain Analysis of Fatigue due to Wide-band Response Processes
(Doktoravhandlinger ved NTNU, 1503-8181; 2008:11, Doctoral thesis, 2008)Mooring systems are widely used in the offshore industry to limit the horizontal excursions of a floating structure from desired position in order for the structure to fulfill the required tasks. Safety of mooring systems ... -
Stochastic, Dynamic Analysis of Offshore Wind Turbines
(Master thesis, 2017)In the last 25 years, offshore wind turbines (OWTs) have moved from small machines of less that 500 kW in a few metres of water to large multi-megawatt machines in water depths exceeding 30 meters. On monopile foundations, ... -
Stokes drift estimation for deep water waves based on short-term variation of wave conditions
(Journal article, 2014)The paper provides a simple analytical method which can be used to give estimates of the Stokes drift based on short-term variation of wave conditions. This is achieved by providing bivariate distributions of wave height ... -
Stokes drift estimation for sea states based on long-term variation of wind statistics
(Journal article, 2017)This paper provides a simple analytical method which can be used to give estimates of the Stokes drift within sea states based on long-term variation of wind conditions. This is exemplified by using long-term wind statistics ... -
Stokes transport in layers in the water column based on long-term wind statistics
(Journal article; Peer reviewed, 2018)This paper addresses the Stokes transport velocity for deep water random waves in given layers in the water column based on wind statistics, which can be estimated by the simple analytical tool provided here. Results are ... -
Strategic Fleet Renewal for Offshore Support Vessels - A maritime fleet size and mix problem
(Master thesis, 2015)In this thesis, a model is proposed for the maritime fleet renewal problem (MFRP) with applications for offshore support vessels (OSVs). This topic of strategic fleet renewal is important in order to ensure a cost efficient ... -
Strategic Planning in Norwegian Aquaculture: A Decision-Support System for Fleet Size and Mix Problems with Processing Vessels
(Master thesis, 2020)Grunnet tiår med enorm suksess for redere i norsk havbruk har det enda ikke vært noen stor etterspørsel etter å inkorporere grundig strategisk planlegging i langsiktig beslutningstaking. Med introduksjonen av spesialfartøy ... -
Strategies and measures for reducing maritime CO₂ emissions
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:201, Doctoral thesis, 2013)CO2 emissions from maritime transport represent 3.3% of global anthropogenic CO2 emissions. These emissions are forecasted to increase by 150% - 250% up to 2050, due to increased freight volumes (Buhaug et al., 2009). ...