Blar i Institutt for marin teknikk på utgivelsesdato
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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 ... -
Numerical Investigation of Ship's Continuous-Mode Icebreaking in Level Ice
(Doctoral Theses at NTNU, 1503-8181; 2014:132, Doctoral thesis, 2014)This thesis is a summary of studies that were carried out as part of candidacy for aPhD degree. The purpose of these studies was to evaluate some factors in shipdesign that are intended for navigating in ice using numerical ... -
Long-term Response Analysis of Wind Turbines with an Emphasis on Fault and Shutdown Conditions
(Doctoral thesis at NTNU;2014:266, Doctoral thesis, 2014)Wind turbines are exposed to a variety of load conditions during their 20-year service life. After installation, every turbine experiences operational, shutdown, and parked conditions, and any of these conditions might ... -
A rational approach to seepage flow effects on bottom friction beneath random waves
(Journal article, 2014)The bottom friction beneath random waves is predicted taking into account the effect of seepage flow. This is achieved by using wave friction factors for rough turbulent, smooth turbulent and laminar flow valid for regular ... -
Development of an Irradiance Sensor Based on a Photon Counting Camera
(Master thesis, 2014)This thesis describes the development and testing of a new irradiance sensor. Light from the sun affects all life on earth, and recent studies give reason to believe that some life might even react to the microscopic levels ... -
Active Magnetic Radial Bearings Applied To Rotor Dynamics
(Master thesis, 2014)This thesis considers the development of a mathematical expression for actively controlled magnetic bearings and their influence on a flexible shaft with two disks supported by two bearings. Active magnetic bearings are a ... -
Content Analysis of Human Factors in Ship Design
(Journal article, 2014)Research shows that more than 80% of accidents at sea were caused by human related factors. Some experts implied that less adequate design is one significant element that may lead to human errors. There are several ways ... -
Nonlinear Wave Loads on Offshore Wind Turbines in Storm Condition
(Master thesis, 2014)Structural ringing can be caused by non-linear hydrodynamic loads in steep waves, by wave slamming, or by breaking waves. This thesis deals with the first category: non-linear wave loads on bottom-fixed offshore wind ... -
Contour Methods for Deepwater Riser Systems
(Master thesis, 2014)This is a master thesis about environmental contour line methods for extreme responseanalysis of deep water marine riser system. The marine riser systems playsan important part of oil and gas exploration and production ... -
Reliability centered maintenance on the Norwegian continental shelf
(Master thesis, 2014)The main objective of this thesis is to unveil the challenges of RCM as an analysis method for assets on the Norwegian continental shelf. A mixed research method have been used, also known as a semi-quantitative method, ... -
Automatic Reliability-based Control of Iceberg Towing in Open Waters
(Master thesis, 2014)Icebergs pose serious threats to existing and planned offshore structures, vessels, and operations in Arctic waters. In order to eliminate the threat, iceberg handling must be performed. This is typically done by single ... -
Hardware-in-the-Loop Testing Systems for ROV Control Systems
(Master thesis, 2014)The use of ROVs has increased in the last decades and today advanced underwater vehicles are used in a wide array of oshore, military and scientific applications. To further improve the usefulness of ROVs modern control ... -
DYNAMIC ANALYSIS OF WORKOVER RISER UNDER UNEXPECTED CONDITIONS
(Master thesis, 2014)The oil and gas business will meet new economical and technical challenges in the future. Increasing water depths and a decreasing number of new findings lead to a demand for higher recovery rates. Workover systems are ... -
Design and Dynamic Analysis of a Steel Pontoon-type Semi-submersible Floater Supporting the DTU 10MW Reference Turbine
(Master thesis, 2014)In recent years, oshore wind energy has experienced a huge development. Floating wind turbines may become competitive for water depth larger than 50m. However, high cost is still the main challenge for the oshore wind ... -
Estimation of the Long-Term Extreme Response of Drilling Riser by the Contour Line Method
(Master thesis, 2014)In order to design a drilling riser, it is essential to know the long-term extreme loads on the riser when it is exposed to a harsh environmental condition. Multiplying the long-term extreme response by a safety factor, ... -
Analysis of Hull Structure Response for a Sevan Arctic Mobile Drilling Unit in Arctic Areas subjected to Ice Loading
(Master thesis, 2014)The interest for Arctic deep water development intensifies as the worldwide demand for oil and gas continues to grow. As much as 25 % of the world s remaining hydrocarbons are assumed to be located in the Arctic area. ... -
Hydroelastic slamming response in the evolution of a flip-through event during shallow-liquid sloshing
(Journal article; Peer reviewed, 2014) -
Development and Verification of a Gesilinger Flexible Coupling Bond Graph Model
(Master thesis, 2014)There has been an increase in ship traffic in Arctic waters the later years, this challenges today's ship design. One of the challenges is the contact loads that occur, due to ice blocks encountering the ship propeller. ... -
Emission Control Areas: Effect on the Fleet Renewal Problem
(Master thesis, 2014)An important strategic planning problem in shipping is the fleet renewal problem. The purpose for liner shipping companies is to minimize the company's costs while finding the best way in which to develop a fleet over time ... -
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 equationfor the air mass is used to establish a theoretical model ...