Browsing Institutt for marin teknikk by Issue Date
Now showing items 541-560 of 3421
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Dynamic analysis of a floating vertical axis wind turbine under emergency shutdown using hydrodynamic brake
(Journal article; Peer reviewed, 2014)Emergency shutdown is always a challenge for an operating vertical axis wind turbine. A 5-MW vertical axis wind turbine with a Darrieus rotor mounted on a semi-submersible support structure was examined in this study. ... -
Fatigue of Flexible Risers Considering Alternative Constitutive Models
(Master thesis, 2014)The flexible riser is made up of both polymeric layers and steel layers, including steel tendons. Due to internal pressure and tension of the pipe, the tendons act with a normal force on the layer underneath. In the beginning ... -
Critical Assessment of Non-linear Wave Loads in the Design of Offshore Wind Turbines
(Master thesis, 2014)Good wind conditions make Dogger Bank a well suited site for offshore wind industry. The harsh environment combined with shallow water, create significant non-linear wave loads which must be accounted for in the ultimate ... -
Review of IACS Unified Requirements for Design of Polar Ships against Ice Loads
(Master thesis, 2014)This master thesis is a review of the IACS Unified Requirements for Design of Polar Ships against Ice Loads. The transversely stiffened plate requirements in IACS URI are based on a roof-top yield line mechanism where the ... -
Design and analysis of a large wind floater - A reinforced concrete pontoon-type semi-submersible supporting the DTU 10MW reference turbine
(Master thesis, 2014)In the project work, the candidate has made a preliminary design of a concrete semi-submersible floater for supporting the DTU 10MW wind turbine. In particular, the focus was the design of pontoons and columns of this ... -
The Arctic DP Research Project: Effective Stationkeeping in Ice
(Journal article; Peer reviewed, 2014)Stress on the environment from a potentially growing energy use is set to rise. Without doubt the energy resources in Arctic regions will be developed. An important goal will be to exploit the resources offered by for ... -
Dynamic Response of Ship Hull due to Slamming
(Master thesis, 2014)In this thesis full-fledged Finite Element Analysis is done for Free vibration analysis and Dynamic Forced Response Analysis of ship hull due to the slam induced load in sea way. This topic is of concern for ships and ... -
Rigid Pipelay Curve Stability
(Master thesis, 2014)Pipeline installation would generally involve curved sections in the horizontal plane, due to existing subsea infrastructure or natural seabed characteristics. At a small curve radius, the lateral seabed friction could be ... -
Development of a numerical simulation model of the forces on ventilating propellers
(Master thesis, 2014)Ships and marine structures operating with propellers will from time to time experience severe, instantaneous thrust and torque losses to air drawing to the propeller. This is known as ventilation, and it may cause serious ... -
A domain-decomposition strategy for a compressible multi-phase flow interacting with a structure
(Journal article, 2014)The problem of a high-pressure gas cavity and its interaction with surrounding liquid and a close-by structure is examined numerically. Even though this is of interest in many practical applications, here, the focus is on ... -
Higher Order Frequency Component in VIV
(Master thesis, 2014)There are still quite a lot unknown and unexplainable territories in hydrodynamic field. VIV is one of them. In today s industry world, existence of uncertainty in VIV prediction program attracts much attention.In this ... -
Arctic Drilling Discrete Event Simulation
(Master thesis, 2014)Økt energibehov har tvunget oljeselskapenes søken etter hydrokarboner til Arktiske farvann. Det vil være utfordringer med å ferdigstille en brønn i løpet av en kort boresesong, med et stort potensiale for hyppige avbrudd. ... -
Analysis and design of the SEVAN FPSO against extreme ice actions
(Master thesis, 2014)Generally, the main objective of this thesis has been completed for the improvement of previous master thesis work. The preparation and background review are accomplished quite sufficient and reflects a good understanding ... -
Waves' numerical dispersion and damping due to discrete dispersion relation
(Chapter; Peer reviewed, 2014)In linear Rankine panel method, the discrete linear dispersion relation is solved on a discrete free-surface to capture the free-surface waves generated due to wave-body interactions. Discretization introduces numerical ... -
Dynamic responses of a jacket-type offshore wind turbine using decoupled and coupled models
(Chapter, 2014)This paper presents numerical studies of the dynamic responses of a jacket-type offshore wind turbine using both decoupled and coupled models. In the decoupled (hydroelastic) model, the wind load is included through ... -
Dynamic Simulation of a Hydraulic Cylinder for Heave Compensation of Deepwater Drilling Risers
(Doctoral thesis at NTNU;2014:320, Doctoral thesis, 2014)This thesis presents global finite element simulations of a hydro-pneumatic riser tension cylinder used for tensioning and heave compensating of marine drilling risers. The global finite element models are made for use ... -
Numerical Investigation of Wave-Body Interactions in Shallow Water
(Chapter; Peer reviewed, 2014)Present investigation is based on a numerical study using a time-domain Rankine panel method. The effort and novelty is to extend the applicability of the solver to shallower waters and to steeper waves by including ... -
Model Test of the STC Concept in Survival Modes
(Chapter; Peer reviewed, 2014)The STC (Spar Torus Combination) concept combines a Spar floating wind turbine and a torus-shaped heaving-body wave energy converter (WEC). Numerical simulation has shown positive synergy between the WEC and the Spar ... -
Increasing the Operation Window of Dynamic Positioned Vessels Using the Concept of Hybrid Control
(Chapter; Peer reviewed, 2014)In order to extend the operational window of marine vessels, the high-level control of the dynamic positioning (DP) system is revised. Major contributions of this paper include the modeling of a hybrid controller for a DP ... -
Hydroelastic response of a submerged structure to an underwater explosion
(Chapter, 2014)The use of composite structures in offshore engineering has revamped the problem of Fluid Structure Interaction (FSI) during underwater blasts because they enhance the FSI effect and increase the shock resistance of ...