Browsing Institutt for marin teknikk by Title
Now showing items 1393-1412 of 3584
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Fabrication of the Hywind Substructure
(Master thesis, 2016)As the technological feasibility of the Hywind has been proven through the Hywind demo project, the way forward is to check the technological and economic feasibility of upscaling the fabrication. In the last years, several ... -
Fabrication, Launching and Towing of Submerged Production Unit - A Technology Development Project of Subsea7
(Master thesis, 2018)The demand for fossil fuels drives for an advancement in the existing subsea technology. The developments evolved as the search for hydrocarbons moved from onshore to offshore, followed by a transition from shallow to deep ... -
Factors Influencing Machinery System Selection for Complex Operational Profiles
(Master thesis, 2014)BackgroundThe environmental consequences, caused by global emission of green house gases (GHG), have received increasingly concern in recent years. CO2 emissions from the maritime sector represent 3,3% of the world s total ... -
Fast onboard detection of ice drift changes under stationkeeping in ice
(Peer reviewed; Journal article, 2022)Early detection of ice drift changes is essential for safe stationkeeping in ice-infested waters. This paper presents a conceptual system allowing onboard detection of ice drift changes in managed and unmanaged ice using ... -
Fatigue Analysis and Design of Mooring Systems. Assessment and comparison of different methods.
(Master thesis, 2015)This master thesis deals with several problems in connection with the evaluation of fatigue damage for mooring lines. One basic problem is to find out the sea states contributing most to the fatigue loads characterized by ... -
Fatigue analysis of a point absorber wave energy converter subjected to passive and reactive control
(Journal article; Peer reviewed, 2015)This paper investigates the effect of a passive and reactive control mechanism on the accumulated fatigue damage of a wave energy converter (WEC). Interest is focused on four structural details of the Wavestar arm, which ... -
Fatigue Analysis of Column-Brace Connection in a Semi-submersible Wind Turbine
(Master thesis, 2012)The importance of offshore renewable energy from wind is expected to increase in the future. Most offshore wind turbines are currently installed in shallow water up to 50 meter water depth on bottom mounted substructures. ... -
Fatigue Analysis of Column-Pontoon Connection in a Semi-submersible Floating Wind Turbine
(Master thesis, 2014)In a world with ever increasing energy demands, there is a need to find new ways to harvest renewable energy. Floating offshore wind turbines could be an important energy source in the future. To make this possible a better ... -
Fatigue Analysis of Column-Pontoon Connection in a Semi-submersible Floating Wind Turbine
(Master thesis, 2014)In a world with ever increasing energy demands, there is a need to find new ways to harvest renewable energy. Floating offshore wind turbines could be an important energy source in the future. To make this possible a better ... -
Fatigue analysis of flexible pipes using alternative element types and bend stiffener data
(Master thesis, 2011)The flexible pipe is a vital part of a floating production system. The lifetime of a flexible riser system is crucial for the Health Safety and Environment (HSE) management. As a result of this, it is very necessary to ... -
Fatigue Analysis of Flexible Riser - Effect of Mean Stress Correction Procedures
(Master thesis, 2013)As the critical part of the oil product system, flexible riser?s fatigue life during the normal operating service is more and more significant. Finding the most dangerous point in the flexible riser and using the accurate ... -
Fatigue Analysis of Flexible Risers: A comparative study of different models for metal fatigue in flexible risers
(Master thesis, 2013)This thesis used different methods to model and predict the fatiguefrom wave loads on the tensile armor layers in a flexible riser in thebending stiffener area. The additional aim of the thesis was to givethe reader an ... -
Fatigue Analysis of Mooring Lines on the Floating Wind Turbine Hywind Demo
(Master thesis, 2013)In the last decades the focus on developing renewable energy has increased tremendously. The main reason for this is the rapid increase of population, which requires enormous amounts of energy. Eventually we will run out ... -
Fatigue Assessment of Aluminium Welded Box-stiffener Joints in Ships
(Doktoravhandlinger ved NTNU, 1503-8181; 2008:88, Doctoral thesis, 2008)One of the trends in ship building is the building of larger and faster ships. However, increasing demand for speed has forced the ship designers to search for alternative materials to reduce the weight of the ship without ... -
Fatigue Assessment of Mooring Chain Considering the Effects Of Mean Load and Corrosion
(Peer reviewed; Journal article, 2021)Results from full scale fatigue tests of offshore mooring chains performed in recent years have revealed considerable influence of both mean load and corrosion condition on the fatigue capacity. It has been shown that a ... -
Fatigue Assessment of Threaded Riser Connections
(Master thesis, 2014)Threaded connections as found in applications like rigid riser, drillstrings, and workover riser are manufactured with sharp notches. Subjected to cyclic loading, those notches lead to high stress concentrations, which ... -
Fatigue assessment of welded joints taking into account effects of residual stress
(Doctoral thesis at NTNU;2014:311, Doctoral thesis, 2014)The aim of the study is to contribute towards a better understanding of the effect of residual stress and shakedown on fatigue strength of welded joints. Residual stress may have a significant effect on the fatigue ... -
Fatigue Considerations based on Measurements from an Offshore Wind Turbine
(Master thesis, 2017)This thesis analyses full scale measurements from a 5 meter diameter, monopile supported, 3.6 MW Siemens offshore wind turbine, standing at about 20 meters water depth at Sheringham Shoal offshore wind farm. Strain ... -
Fatigue crack growth in mooring chain steel at different mean load levels
(Peer reviewed; Journal article, 2023)The fatigue crack growth rates of R4 mooring chain steel at different R-ratios are investigated. Crack growth experiments are performed at three different R-ratios, 0.1, 0.3 and 0.7, utilizing compact tension specimens in ... -
Fatigue Crack Rrowth Simulation Using xEtended Finite Element Method
(Master thesis, 2013)Fatigue crack growth analysis of offshore structure is concerned by the industry because it?s economical and practical to increasing the usage life of the strucutre by extend it?s fatigue life. S-N approachs are the most ...