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Time domain simulation of vortex-induced vibrations in stationary and oscillating flows
(Journal article, 2016)This paper focuses on the further development of a previously published semi-empirical method for time domain simulation of vortex-induced vibrations (VIV). A new hydrodynamic damping formulation is given, and the necessary ... -
TIME DOMAIN SIMULATION PARAMETERS FOR FATIGUE ASSESSMENT OF AN OFFSHORE GRAVITY BASED WIND TURBINE
(Master thesis, 2018)Renewable sources of energy are becoming more and more important as the years go by due to both technological development and a greener human attitude. Offshore wind turbines are presented as a productive source of energy ... -
Time domain simulations of wind turbine blade installation using a floating installation vessel
(Master thesis, 2017)This paper is aimed to assess the feasibility of the mating of the blade of an OWT by a floating installation vessel. A state of the art analysis of the current practices in the industry shows that jack-up vessels are ... -
Time domain simulations of wind- and wave-induced load effects on a three-span suspension bridge with two floating pylons
(Journal article, 2018)The construction of a three-span suspension bridge with two floating pylons is currently being considered for crossing the 5-km-wide and 550-m-deep Bjørnafjorden in Norway. The bridge design represents a novel concept that ... -
Time domain versus frequency domain VIV modelling with respect to fatigue of a deep water riser
(Master thesis, 2017)In this thesis the new time domain model developed by PhD. Mats J. Thorsen is compared with the current practice, with respect to fatigue of a deep water riser. Current practice is to superposition the fatigue damage due ... -
Time Domain VIV Analysis Tool VIVANA-TD: Validations and Improvements
(Chapter, 2020)An empirical time-domain (TD) vortex-induced vibration (VIV) prediction model has been implemented in a software called VIVANA-TD based on its earlier development by Thorsen at NTNU. It models the synchronization of VIV ... -
Time Domain Vortex-Induced Motion Prediction of Spar-Type Floating Wind Turbine
(Master thesis, 2023)Flytende vind øker for tiden i popularitet og den flytende spar-vindturbinen viser stort potensial til å tre frem som en viktig brikke i den globale energiomstillingen til fornybare kilder. Denne konstruksjonen kan oppleve ... -
Time domain-based gear contact fatigue analysis of a wind turbine drivetrain under dynamic conditions
(Journal article; Peer reviewed, 2013)This paper presents a general approach to predict the contact fatigue life of the gears in the drive-train system of a wind turbine under dynamic conditions. A simplified predictive pitting model that estimates service ... -
Time scale for scour beneath pipelines due to long-crested and short-crested nonlinear random waves plus current
(Journal article; Peer reviewed, 2021)This article derives the time scale of pipeline scour caused by 2D (long-crested) and 3D (short-crested) nonlinear irregular waves and current for wave-dominant flow. The motivation is to provide a simple engineering tool ... -
Time Scales for Scour Below Pipelines and Around Vertical Piles in Nonlinear Random Waves and Current
(Master thesis, 2015)This report presents a stochastic method for predicting the time scale of scour and backfilling, occurring around vertical piles and marine pipelines on the seabed. The erosion occurs due to waves alone or waves com- bined ... -
Time-domain fatigue response and reliability analysis of offshore wind turbines with emphasis on welded tubular joints and gear components
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:331, Doctoral thesis, 2012)Presently fixed support structures are mainly used in the offshore wind industry, e.g. monopile, tripod, gravity base, et al., where the water depth are usually less than 30 m. Research work is ongoing for deeper water ... -
Time-domain floater stress analysis for a floating wind turbine
(Peer reviewed; Journal article, 2023)There are increasing focuses on developing cost-effective floating wind turbines, for which efficient stress analysis methods are needed for floater structural design. Most of the today's studies focus on global analysis ... -
Time-domain Global Response Analysis of a Novel 5MW Semi-submersible Wind Turbine Considering the Effect of Second-order Wave Loads
(Master thesis, 2015)In recent years wind energy industry has been developing very fast, moving from onshore to offshore and from shallow water to deep water. Offshore wind has a huge potential for long-term sustainable energy supply and deeper ... -
Time-domain Roll Motion Analysis of a Barge for Transportation of an Offshore Jacket Structure
(Master thesis, 2018)This paper presents a literature study on roll motions for barges, and time domain and frequency domain simulations. In addition, results from time and frequency domains have been compered in regular and irregular waves ... -
Time-domain simulation of floating wind power plants in irregular seas
(Master thesis, 2011)As the limited fossil energy sources become empty, new sources for energy need to be exploited. One such renewable energy is wind energy. The wind energy potential is high offshore, and is therefore a beneficial location ... -
Time-Domain Simulation of Floating, Dynamic Marine Structures using USFOS
(Master thesis, 2013)This master thesis deals with calculation of the convolution integrals that constitutethe memory functions in the linear time-domain wave response equation. Basictheory needed to calculate the forces acting on floating ... -
Time-domain simulation of marine structures in irregular seas
(Master thesis, 2015)For dynamically sensitive marine structures or marine structures subjected to large displacements the extreme response is often determined on the basis of short term time domain simulation of extreme sea states using the ... -
Time-domain wave estimation and prediction using wave radar on R/V Gunnerus
(Master thesis, 2022)Marine operasjoner beveger seg stadig på dypere vann og mer utfordrende omgivelser. Å garantere sikkerhet i slike omgivelser er en av de viktigste motivasjonene bak forskning i marin teknologi. Nøyaktige forutsigelser for ... -
Time-frequency analysis of acceleration data from ship-ice interaction events
(Journal article; Peer reviewed, 2018)During operations with ships in ice-infested waters, vibrations of the hull occur due to ship-ice interaction. The acting ice load and the induced vibrations depend on the ice regime and ice breaking mechanism. Especially ... -
Time-Varying Model-Based Observer for Marine Surface Vessels in Dynamic Positioning
(Journal article; Peer reviewed, 2017)This paper deals with the problem of transient events in model-based observers for dynamic positioning of marine surface vessels. Traditionally, model-based observers experience a deterioration of performance during ...