Blar i Institutt for marin teknikk på utgivelsesdato
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System Based Design for Mobile Offshore Units
(Master thesis, 2014)This thesis seeks to investigate the possibilities of adapting the method of system based ship design developed by Kai Levander (2012), to be applied to MOU s. Design is the creation of a plan or construction of an object. ... -
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 ... -
Simulation of Marine Lifting Operations with Focus on Structural Response Control
(Master thesis, 2014)As the offshore industry operates on deeper seas, subsea technology becomes more and more important. As a consequence of this, marine lifting operations of subsea equipment has become very common. Prior to such an operation ... -
Approaches for assessment of weld fatigue and verification of the effective notch stress approach
(Master thesis, 2014)Fatigue of welded structures is commonly assessed in three ways. These are the nominal stress-, the structural hot spot- and the effective notch stress approach. As the applicability of the approaches differs, these ... -
Risikoforhold ved automatisk bedøving og manuell bløgging av snurrevadfisk
(Research report, 2014)Det er foretatt en tidlig HMS-vurdering av en ny prosesslinje for mekanisert og delvis automatisert bløgging av torskefisk fanget med snurrevad. Hensikten med å innføre en slik prosesslinje med elektrisk bedøving og ... -
Lowering and lifting operations through moonpools: Hydrodynamic investigations
(Master thesis, 2014)On construction vessels subsea modules, diving bells, cables and so on are often lifted through a moonpool. The advantage of using a moonpool is that the surface elevation inside the moonpool is shielded against the outside ... -
Impact analysis of flexible riser
(Master thesis, 2014)Research shows 35% of damage to flexible pipes occurs within the first year. A minimum of these failures are from poor design or manufacturing problems, since factories conduct Factory Acceptance Tests (FAT). Additionally, ... -
Numerical Modelling of Turbulent Boundary Layer
(Master thesis, 2014)Most physical problems involving viscous fluid flows are characterized by turbulence where instabilities and large velocity gradients generate fluctuations in the flow field. Towed sonar arrays are exposed to turbulence ... -
Impacts of Low Load Operation of Modern Four-Stroke Diesel Engines in Generator Configuration
(Master thesis, 2014)Diesel engines in generator configuration are normally optimized for operations at medium to high engine loads. It is suspected that operations at low loads may increase operational problems and thus the damage frequency. ... -
Utslipp til luft og NOx - reduksjon på grunn av NEA på Marine dieselmotorer
(Master thesis, 2014)Denne rapporten tar for seg ulike NOx reduserende teknologier med hovedfokus på NEA teknologi. NOx reduksjon ved bruk av NEA baseres på prinsippet om at motorens ladeluft blir tynnet ut ved hjelp av nitrogen. På den ... -
SIMULATION OF RISER DISCONNECTION IN STOCHASTIC WAVES
(Master thesis, 2014)Ever since the first oil was discovered in Norway in 1971 the production rates have varied. The development has gone from few wells with high production rates to several wells with lower production rates. It is expected ... -
Electric Cable Ferry: Feasibility study of an electric ferry concept
(Master thesis, 2014)AbstractThe thesis in hand has investigated the feasibility of a cable electric ferry concept. The concept investigated is based on that a short route ferry receives its propulsive power through a cable connected to the ... -
Fatigue Reliability-Based Inspection and Maintenance Planning of Gearbox Components in Wind Turbine Drivetrains
(Journal article; Peer reviewed, 2014)This paper introduces a reliability-based maintenance plan for wind turbine gearbox components. The gears and bearings are graded based on their fatigue damage and a maintenance map is developed to focus on those components ... -
Water Entry of Freefall Wedges-Wedge Motions and Cavity Dynamics
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:144, Doctoral thesis, 2014)When a free falling object enters a free surface of water, it may go through four successive phases: impact, flow separation from the body surface, creation and pinch-off of the cavity above the body, and oscillation of ... -
Dynamic Analysis of Floating Bridges with Transverse Pontoons
(Master thesis, 2014)The main objective of this thesis is to analyse the dynamic response of floatingbridges with transverse pontoons, when subjected to harmonic regular waveloads. As a result, a simplified beam model of the Bergsøysundet ... -
Optimalisering av søkemønstre for bruk ved SAR-operasjoner i kalde omgivelser
(Master thesis, 2014)Den økte aktiviteten i nordområdene og rundt Arktis gir nye utfordringer hva gjelder beredskap. Fartøy og aktører blir i disse store områdene pålagt å kunne håndtere krisesituasjoner i større grad på egenhånd enn andre ... -
Wave-induced current for long-crested and short-crested random waves
(Journal article; Peer reviewed, 2014)This paper provides a simple analytical tool which can be used to calculate the wave-induced current beneath long-crested (2D) and short-crested (3D) random waves. The approach is based on assuming the waves to be a ... -
Snaking Behavior of Umbilicals
(Master thesis, 2014)Umbilical is a hardware element that connects the subsea systems to the top side systems of a floating production unit. During its manufacture, storage and installation, sometimes it shows behaviour like snake as found in ... -
Human Technical Factors in FPSO-Shuttle Tanker interactions and their influence on the Collision Risk during Operations in the North Sea
(Master thesis, 2014)Following a series of collisions and near-misses, involving shuttle tanker and FPSO performing tandem offloading operations in the North Sea, extensive effort was put to address the issue in the early 2000 s. The aim of ... -
Reliability Analysis of Blowout Preventer Systems: A comparative study of electro-hydraulic vs. all-electric BOP technology
(Master thesis, 2014)A blowout preventer (BOP) is a large valve used to seal, control and monitor oil and gas wells. It serves as an important barrier against blowouts. Excessive downtime on the BOP is a problem for drilling companies worldwide, ...