Blar i Institutt for marin teknikk på utgivelsesdato
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SCOUR BELOW PIPELINES AND AROUND VERTICAL PILES DUE TO RANDOM WAVES PLUS CURRENT ON MILD SLOPES
(Master thesis, 2014)This thesis presents a stochastic method for predicting the scour depth around vertical circular slender piles and below marine pipelines due to random waves plus current on mild sloping seabeds. An overview of the scour ... -
Bucket Foundation in Clay for OWT Subjected to Combined Cyclic Loads
(Master thesis, 2014)This thesis project investigates the bucket foundation in clay subjected to cyclic loads. The cyclic irregular loading history in this thesis was represented by the equivalent number of cycles Neq with a certain level of ... -
Accidental Impact Resistance of non-disconnectable bouy type FPSO
(Master thesis, 2014)The surroundings of offshore structures consist of many components controlled by nature, but also some that are managed by people- ships. Due these factors, ship collisions are a constant threat to offshore installations ... -
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 ... -
Modelling and Robust Control of Production Force of a Wave Energy Converter
(Master thesis, 2014)Lifesaver is a point-absorber wave energy converter developed by Fred. Olsen. She is currently deployed off the coast of England for pre-commercial testing. Lifesaver consists of a toroidal floater supporting three Power-Take ... -
Transverse tensile armour buckling of flexible pipes
(Master thesis, 2014)During the installation and operation process, the empty flexible pipe will experience a largeend fitting load which is the compression load at the ends of the pipe. At the same time, the dynamicload from wave and current ... -
Parametric Studies of Dynamic Response for a Workover Riser
(Master thesis, 2014)A workover riser is a top tensioned riser, in essence similar to a marine riser. Workover risers differ from marine risers mainly by smaller dimensions, as well as simpler solutions at the riser ends. For instance, the ... -
Fatigue Loads on Large Diameter Monopile Foundations of Offshore Wind Turbines
(Master thesis, 2014)The objective of this master thesis is to investigate the fatigue loading on an offshore wind turbine located in a waterdepth of 45 m. Offshore wind turbines are especially prone to fatigue due to variable environmental ... -
STATISTICS OF BENDING MOMENT IN THE SPLASH ZONE OF A TENSIONED RISER
(Master thesis, 2014)The main idea of SLTS method is to find a design storm that the extreme responses of a structure in its design lifetime can be obtained from this seastate, instead of performing full long-term time-domain dynamic analysis. ... -
Assessment of Hull Response due to Impact from Falling Object
(Master thesis, 2014)The present study assesses ship hull response of a platform supply vessel due to impact from falling objects. This is carried out primarily by investigating the critical energy absorption and localised deformation to ... -
A reliability study of a Deepwater Vertical Xmas Tree with attention to XT retrieval rate
(Master thesis, 2014)The focus of this thesis is towards the subsea Xmas Tree (XT) system. The XT is recognized by the industry as an overall reliable configuration, but as in all development projects, it is a constant battle to optimize the ... -
Long Term Scheduling of Major Renewals: Systematic Approach and Financial Applications
(Master thesis, 2014)Much of the oil and gas installations in the North Sea originate from the booming 80s and 90s, and operators are facing considerable challenges in the managementof their ageing assets. Harsh environments combined with ... -
Modeling of Technical, Human and Organizational Factors and Barriers in Marine Systems Failure Risk: Modeling of Stability Operations on a Semi-Submersible Unit with the use of Bayesian Belief Networks
(Master thesis, 2014)Offshore operations in the relatively harsh conditions on the Norwegian Continental Shelf requires a strict safety focus. In order to conduct safe operations, a range of risk analysis tools are needed to monitor the risk ... -
Buckling of Cylindrical Shells with a Granular Core Under Global Bending: Strength Gains and Imperfection Sensitivity
(Master thesis, 2014)Thin cylindrical shells are commonly employed in civil and structural applications in which the dominant loading condition is global bending. In applications such as wind turbine towers and offshore piles, the design of ... -
Unsteady RANS Simulation of Flow around Rectangular Cylinders with different Aspect Ratios at High Reynolds Number
(Master thesis, 2014)Computational Fluid Dynamics (CFD) has been used to evaluate essential hydrodynamic quantities and flow structures around rectangular cylinders with different chord length to depth ratios (aspect ratios) at high Reynolds ... -
Supply Chain Design under Uncertainty: Locating LNG distribution centers in an emerging market with uncertain demand
(Master thesis, 2014)According to the International Energy Agency, the global use of natural gas will increase dramatically in the next two to three decades. Due to factors ranging from national and international energy market regulations to ... -
Frequency based Wind Turbine Gearbox Fault Detection applied to a 750 kW Wind Turbine
(Journal article, 2014)Reliability and availability of modern wind turbines are of increasing importance, for two reasons. The first is due to the fact that power grids around in the world depends at a higher and higher degree on wind energy, ... -
Seepage effects on bedload sediment transport rate by random waves
(Journal article, 2014)The mean net bedload sediment transport rate beneath random waves is predicted taking into account the effect of seepage flow. This is achieved by using wave half-cycle bedload sediment transport formulas valid for regular ... -
Modulbasert design av fiskefartøy
(Master thesis, 2014)Bakgrunn: De norske fiskeriene har utviklet seg fra å være nærmest et fritt fiske til en gjennomregulert næring med strenge regelkrav. Antall fiskefartøy har gått ned, men de har samtidig blitt større og mer effektive. Den ... -
Analysis of Ice-Induced Damages to a Cargo Carrier and Implications wrt. Rule Requirements
(Master thesis, 2014)In this thesis, an ice-induced damage to a DNV-GL registered cargo ship isinvestigated by looking into its damage survey report, and running nonlinearfinite element analyses. The analyses are used for regeneration of the ...