Browsing Institutt for marin teknikk by Issue Date
Now showing items 661-680 of 3421
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Mooring System Diagnosis and Structural Reliability Control for Position Moored Vessels
(Journal article; Peer reviewed, 2014)Early diagnosis and fault-tolerant control are essential for safe operation of floating platforms where mooring systems maintain vessel position and must withstand environmental loads. This paper considers two critical ... -
Improving Ship Operational Efficiency by Statistical Analysis of Voyage Data
(Master thesis, 2014)As a result of increased fuel oil prices the fuel cost accounts for an increasingly larger portion of the total operation costs for a vessel. Traditionally the fuel cost has been low compared to costs related to crewing ... -
Numerical Investigation of Free Surface Flows
(Master thesis, 2014)The Star-CCM+ simulation software has been used to model a number of benchmark free surface flow cases, including the two dimensional submerged NACA 0012 foil, the surface piercing NACA 0024 foil, and the well investigated ... -
Operational Barrier Elements in Critical Drilling Operations: Understanding Failure Mechanisms in the Primary Well Barrier
(Master thesis, 2014)This thesis concerns the use of human reliability analysis in offshore quantitative risk analysis (QRA). A QRA is a risk analysis which produces numerical values for probabilities of, and consequences from, undesired events. ... -
Wake flow behind a curved cylinder
(Master thesis, 2014)This thesis reports the result of an experiment measuring the wake flow behind a curved circular cylinder at Re=3900 in water. The measurement technique used was Particle Image Velocimetry (PIV). The cylinder is a convex ... -
Comparing alternative flexible pipe fatigue stress models with focus on the Bflex helix models
(Master thesis, 2014)this thesis deals with the stress and slip behaviour for non-bonded flexible pipe of three different models (itcode0, itcode1 and fullfe), comparisons are made among these three models. Besides, pipes with different cross ... -
Lessons from aviation: Applying threat and error management framework to cases from the offshore drilling industry
(Chapter, 2014)After the Macondo blowout in the Gulf of Mexico in 2010, several actions have been proposed to enhance safety in drilling operations. Among the suggested safety measures is the application of aviation style teamwork training ... -
Simulation model for an LNG ferry
(Master thesis, 2014)Developing regulations for improving safety at sea has been a concern since in-ternational trading became a reality. The International Maritime Organization(IMO) has become the international adopted treaty, which regulates ... -
Extreme Value Analysis of Riser Systems for large Water Depths
(Master thesis, 2014)In relevant Norwegian regulations, the characteristic response is defined as a given annual probability of exceedance. Effective and accurate methods of estimating the response for the required annual probability levels ... -
Distributed Control of a Drifting Formation of Autonomous Underwater Vehicles
(Master thesis, 2014)Cooperative underwater missions grow larger and larger. For survey mission such as seismic acquisition, such missions would involve hundreds of independent nodes in formation. But batteries limit the endurance. To make ... -
On long-term fatigue damage and reliability analysis of gears under wind loads in offshore wind turbine drivetrains
(Journal article; Peer reviewed, 2014)In this paper, a long-term fatigue damage analysis method for gear tooth root bending in wind turbine’s drivetrains is presented. The proposed method is established based on the ISO gear design codes which are basically ... -
Analysis of ROV Lift Operation
(Master thesis, 2014)As a service company performing subsea operations, DeepOcean wishes to operate in the widest range of sea conditions. The majority of all offshore operations are performed using remotely operated vehicles (ROVs), where ... -
Numerical Simulation for Installation of Jacket Foundation of Offshore Wind Turbines
(Master thesis, 2014)A large contribution to the overall project costs of an offshore wind farm originates from the transport and installation of the substructures. A better understanding of the operational limits that apply for the installation ... -
Installation of large subsea structures - Lowering of suction anchors through the splash zone
(Master thesis, 2014)In this thesis the dynamic air cushion pressure inside suction anchors during low- ering through the splash zone has been studied. A non-linear continuity equation for the air mass is used to establish a theoretical model ... -
Line-Of-Sight-based maneuvering control design, implementation, and experimental testing for the model ship C/S Enterprise I.
(Master thesis, 2014)This report documents the progress, methods and engineering in building and testing theframework for CyberShip Enterprise 1. The main focus have been to modularize, standardize and improve the infrastructure and the operative ... -
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 ... -
Combined effects of elevated CO2 and food limitation on early life stages of Clanus finmarchicus
(Master thesis, 2014)The early life stages of Calanus finmarchicus were exposed to two levels of pCO2, 380 ppm (control) and 2080 ppm (elevated CO2) and two different food concentrations, ~ 600 µg C/L (high food concentration) and ~150 µg C/L ... -
Optimization of propeller pitch and revolutions in behind condition
(Master thesis, 2014)To reduce costs and limit pollution from transportation of goods by sea, a method for optimization of the propulsive efficiency of an 8000 dead weight tonnage tanker is investigated. Emphasis is put on the interaction ... -
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 ... -
Experimental and Numerical Investigation of a Double-Acting Offshore Vessel Performance in Level Ice
(Journal article; Peer reviewed, 2014)In this paper a numerical model and experimental data are used to investigate the level ice performance of a double-acting intervention vessel. The icebreaking capability and maneuverability in level ice are analyzed by ...