Browsing Institutt for marin teknikk by Issue Date
Now showing items 581-600 of 3421
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Risikobasert Inspeksjon (RBI): Studie av Statoil Mongstads RBI-program tilknyttet skall-og-rør varmevekslere, for å avdekke mulige forbedringstiltak .
(Master thesis, 2014)I denne oppgaven har det blitt studert hvordan Statoil Mongstad planlegger og gjennomfører Risikobasert Inspeksjon (RBI) på to utvalgte varmevekslere av typen skall- og- rør. Inspeksjoner som utføres på varmevekslerne er ... -
Hybrid testing of deep water moored structures
(Master thesis, 2014)This thesis presents a design concept for deep water model testing of moored floating offshore structures in ocean basin, and presents a single degree of freedom (SDOF) test setup for this purpose. Conventional methods has ... -
Analysis of Low-Frequency Damping in Mooring Lines for Floating Production Units
(Master thesis, 2014)In this thesis, the relationship between mooring line damping and system responses, due to varying environmental conditions, is investigated. The responses focus mainly on the low-frequency (LF) components and on the ... -
Sammenligning av moment og spiralmodeller for utmatningsanalyse av fleksible stigerør
(Master thesis, 2014)There are still quite a lot of unknown and unexplainable fields in riser section, whose fatigue damage may cause loss of lives, environmental pollution and threats to the economy. In this thesis, two methods to find the ... -
Effect of Flap Type Wave Energy Converters on the Response of a Semi-Submersible Wind Turbine in Operational Conditions
(Chapter; Peer reviewed, 2014)In the present paper the effect of flap type wave energy converters on the response of a floating semi-submersible wind turbine is investigated and reported. Two different layouts with regard to the number of rotating flaps ... -
Design and analysis of combined floating wave and wind power facilities : with emphasis on extreme load effects of the mooring system
(Doctoral thesis at NTNU;, Doctoral thesis, 2014)A rapid increase in energy demand and the global warming problem has increased the focus on renewable energy resources. Among renewable sources, ocean wave and offshore wind are the topic of this thesis because both ... -
Fully-nonlinear wave-current-body interaction analysis by a harmonic polynomial cell method
(Journal article; Peer reviewed, 2014)A new numerical 2D cell method has been proposed by the authors, based on representing the velocity potential in each cell by harmonic polynomials. The method was named the harmonic polynomial cell (HPC) method. The method ... -
Hydrodynamic performance of sail-assisted merchant vessels
(Master thesis, 2014)The main goal of this project was to explore the different physical effects that are involved when a ship is using the technology of wing sails as propulsion. The wing sails can provide a lot of thrust, but they also create ... -
Theoretical and experimental studies of wave diffraction and radiation loads on a horizontally submerged perforated plate
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:22, Doctoral thesis, 2014)Interactions of free-surface waves and submerged perforated structures are far less understood than the interactions of waves and conventional impermeable structures. This motivates the present research to investigate major ... -
Statistics of surf parameter and wave power for individual waves
(Master thesis, 2014)In this thesis, the theoretical bivariate distribution of surf parameter and wave height is derived from a theoretical joint distribution of wave height and wave period based on narrow band approximation. Statistical ... -
Using Autonomous Underwater Vehicles as Sensor Platforms for Ice-Monitoring
(Journal article; Peer reviewed, 2014)Due to the receding sea-ice extent in the Arctic, and the potentially large undiscovered petroleum resources present north of the Arctic circle, offshore activities in ice-infested waters are increasing. Due to the presence ... -
Development of bryozoan fouling on cultivated kelp (Saccharina latissima) in Norway
(Master thesis, 2014)Biofouling of cultivated kelp is a major challenge for the seaweed industry, and hard to avoid during the cultivation process. Several species are involved in the fouling in temperate waters, and among them are the encrusting ... -
Flexibility in Ship Design: Off-Seasonal Utilization of Purse Seiner/Trawlers
(Master thesis, 2014)Due to overcapacity in the Norwegian purse seiner/trawler fleet, statistics show that the vessels have been idle for an average of 192 days each, the period 2006-2012. As the vessels and crew are highly regarded in shipping ... -
Control of Thruster Assisted Position Mooring System on Floating Production Storage and Offloading
(Master thesis, 2014)Denne avhandlingen er et studie på forankringssystemer på flytende produksjon, lagring, lossing (FPSO) enheter, og omfatter en undersøkelse av POSMOOR system. En modell som inneholder et thruster assistert posisjon ... -
Uncertainties In Predicted Extreme Wave Induced Platform Response
(Master thesis, 2014)Before the long term response prediction is performed, a generic response function is firstly introduced. The generic response function is given as a function of weather characteristics in terms of hs and tp, and the shape ... -
Modelling and Global Analysis of Submerged Loading System in Deep Waters
(Master thesis, 2014)Framo Engineering has replaced tanker loading unit (TLU) by a Framo submerged loading (FSL) system at Draugen, with 257m water depth, in summer 2012. In recent years a lot of activities of oil and gas companies including ... -
Sensitivity Analysis of large Rotor Diameter on Offshore Wind Turbines with Suction Foundation
(Master thesis, 2014)This thesis has an objective aimed at understanding the sensitivity of the support structure for an offshore wind turbine with bucket foundation as the turbines get larger. The focus has been on the response and forces on ... -
Risk Management in Shipbuilding Projects - Using Monte Carlo Simulation for Scheduling
(Master thesis, 2014)The main objective of this thesis was to identify potential improvements of the risk management process to DNV GL so that it is best fit at identifying risk of time overruns and estimating project duration. Focus was placed ... -
Ice Load Impact on the Power Train of Azimuth Propulsion Systems
(Master thesis, 2014)This thesis seeks to investigate the advantages of using multibody simulation to develop proper models for power train analyses of azimuth propulsion systems. Azimuth thrusters are commonly installed on ice classed offshore ... -
Comparison of the stress distribution in the metallic layers of flexible pipes using two alternative Bflex formulations
(Master thesis, 2014)Axisymmetric load is the most common load acting on flexible pipe. Modelling axisymmetric load correctly is very important to estimate the strength of a flexible pipe. The purpose of the thesis is to compare the stress ...