Browsing Institutt for marin teknikk by Title
Now showing items 1447-1466 of 3417
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Foundations of offshore wind turbines: A review
(Journal article; Peer reviewed, 2019)Offshore wind is a source of clean, renewable energy of great potential value to the power industry in the context of a low carbon society. Rapid development of offshore wind energy depends on a good understanding of ... -
Four Degree-of-Freedom Hydrodynamic Maneuvering Model of a Small Azipod-Actuated Ship With Application to Onboard Decision Support Systems
(Peer reviewed; Journal article, 2023)The main contribution of this paper is a numerical ship motion model of NTNU’s research vessel Gunnerus, capturing the surge, sway, roll, and yaw dynamics when sailing in uniform and steady currents. The model utilizes a ... -
FPSO Cidade de São Mateus gas explosion - Lessons learned
(Journal article; Peer reviewed, 2018)The explosion accident in February 2015 on the Floating Production, Storage and Offloading (FPSO) unit Cidade de São Mateus in the Brazilian offshore sector was the most severe offshore petroleum accident since the Macondo ... -
A Framework for Condition Monitoring and Risk-Based Decision Support Involving a Vessel State Observer
(Chapter, 2021)Digital twins have attracted significant attention across different domains for decades. In the maritime and the energy industries, digital twins have been mainly used for system condition monitoring, project visualization, ... -
A framework for efficient isogeometric computations of phase-field brittle fracture in multipatch shell structures
(Peer reviewed; Journal article, 2020)We present a computational framework for applying the phase-field approach to brittle fracture efficiently to complex shell structures. The momentum and phase-field equations are solved in a staggered scheme using isogeometric ... -
Free Surface Reconstruction for Phase Accurate Irregular Wave Generation
(Journal article; Peer reviewed, 2018)The experimental wave paddle signal is unknown to the numerical modellers in many cases. This makes it quite challenging to numerically reproduce the time history of free surface elevation for irregular waves. In the present ... -
Free-Surface Tracking in 2D with the Harmonic Polynomial Cell Method: Two Alternative Strategies
(Journal article, 2017)Several cases of nonlinear-wave propagation are studied numerically in two dimensions within the framework of potential flow. The Laplace equation is solved with the Harmonic Polynomial cell (HPC) method, which is a field ... -
Frequency based Wind Turbine Gearbox Fault Detection applied to a 750 kW Wind Turbine
(Journal article, 2014)Reliability and availability of modern wind turbines are of increasing importance, for two reasons. The first is due to the fact that power grids around in the world depends at a higher and higher degree on wind energy, ... -
Frequency Dependence of Bilge Keels
(Master thesis, 2018)The goal of this master's thesis is to inspect the damping generated by bilge keels. Two dimensional cross sections have been modeled both with and without bilge keels and simulated using the computational fluid dynamics ... -
Frequency domain modelling of a coupled system of floating structure and mooring Lines: An application to a wave energy converter
(Peer reviewed; Journal article, 2021)Floating structures for single offshore renewable energy devices, i.e. wave energy converters, tend to be significantly smaller than those of the traditional offshore industry and the interaction between floater motions ... -
Frequency-Dependent Aerodynamic Damping and Inertia in Linearized Dynamic Analysis of Floating Wind Turbines
(Journal article; Peer reviewed, 2020)In frequency-domain (FD) models of floating wind turbines (FWT), it is common to regard the interaction between nacelle motions and thrust by means of a constant aerodynamic damping coefficient. This approach is effective ... -
Frequency-domain Method for Global Dynamic Response Analysis of a Semi-submersible Floating Wind Turbine
(Master thesis, 2018)The wind energy market is increasing. Developing offshore wind turbines has several advantages. Conventional time-domain methods in global dynamic response analysis are time-consuming. Inspired by this, the frequency-domain ... -
Frequency-domain Roll Motion Analysis of a Transportation Barge Using Stochastic Linearization of Viscous Roll Damping
(Master thesis, 2018)This thesis is proposed by DNV GL, and presents a comparative study of frequency-domain and time-domain analysis of the roll motion. The goal is to perform a roll motion analysis of a barge-cargo system considering linearized ... -
Friction models for evaluating dynamic stresses in non-bonded flexible risers
(Journal article; Peer reviewed, 2017)This paper addresses friction models used for evaluating dynamic stresses in non-bonded flexible risers. A review of the most commonly used methods to model friction between layers in such structures was performed. Four ... -
From Newbuilding to Operation: Information Handling in Ship Management
(Master thesis, 2010)In this thesis, I have looked into the current practice of information handling within a ship management. The work is done in cooperation with Höegh Fleet Service, and all the described processes and the organizational ... -
From Teaching as Transmission to Constructive Alignment: A Case Study of Learning Design
(Peer reviewed; Journal article, 2021)This paper reports on an action research study on curriculum design in an optional module at the Norwegian University of Science and Technology. There were two professors teaching their respective parts, henceforth termed ... -
FSI Analysis of Abnormal Wave Slamming Events
(Master thesis, 2020)Slamming impact is a hazardous phenomenon to ships and offshore structures, which is characterised by a highly nonlinear coupling interaction between the structure and the fluid. To evaluate it correctly and accurately is ... -
Fuel Cells in Offshore Oil and Gas Production
(Master thesis, 2017)The petroleum industry is confronted with a two-faced challenge as global energy demand is set to increase simultaneously as greenhouse gas emissions must be reduced in order to combat global climate change. With the signing ... -
Fuel consumption and emission reduction of marine lean-burn gas engine employing a hybrid propulsion concept
(Peer reviewed; Journal article, 2021)As the emission legislation becomes further constraining, all manufacturers started to fulfill the future regulations about the prime movers in the market. Lean-burn gas engines operating under marine applications are also ... -
Fuel savings for a general cargo ship employing retractable bow foils
(Journal article, 2018)Route simulations were performed on a 100 m long (between perpendiculars) general cargo ship equipped with retractable bow-mounted foils, so-called wavefoils, for resistance reduction and motion damping in waves. Two ...