Browsing Institutt for marin teknikk by Issue Date
Now showing items 281-300 of 3421
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Dynamic simulation of deep water drilling risers with heave compensating system
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:175, Doctoral thesis, 2012)This thesis discusses modelling aspects related to dynamic analysis of deep water drilling risers. These risers must have a heave compensator that maintains a near constant tension independent of platform motions. Traditional ... -
Investigation of the Wake Flow behind a stepped circular Cylinder using Particle Image Velocimetry
(Master thesis, 2012)Subject of the present study was the investigation of the wake behind stepped circular cylinders. Experiments were performed using particle image velocimetry (PIV). Cylinder models with diameter ratios D/d=1, D/d=6/5 and ... -
Logistikkløsning for offshore oppdrettsanlegg
(Master thesis, 2012)Denne rapporten viser noen logistikkløsninger for offshore oppdrettsanlegg, og sammenligne de med dagens praksis. Bakgrunnen for oppgaven er de siste 20 årenes kontinuerlige stigning i volum av oppdrettslaks, en utvikling ... -
Cargo Stowage Planning in RoRo Shipping: Optimisation Based Naval Architecture
(Master thesis, 2012)Operations research has proven itself to be advantageous in several areas of the industry for many years, but is operations research a good approach to operational maritime planning? Expressions used to calculate the initial ... -
Fault tolerant position mooring control based on structural reliability
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:156, Doctoral thesis, 2012)Safety of position mooring system is a prime concern in the marine industry and regulations are in force to prevent faults in equipment from causing failure of the whole system. There are many reasons for failures in ... -
Modular approach to offshore vessel design and configuration
(Master thesis, 2012)The design process used in most vessel design approaches can be described as sequential and iterative, where the initial design is subject to constant improvements. The process development is thereby constrained by the ... -
Stratified flow over complex topography: A model study of the bottom drag and associated mixing
(Journal article; Peer reviewed, 2012)The flow of stratified fluid over complex topography may lead to a significant drag on the fluid, exerted by the bottom obstacles. Using a 2-m resolution, three-dimensional, non hydrostatic numerical ocean model, the drag ... -
Motion analysis of Semi-Submersible
(Master thesis, 2012)In this thesis the response variables (RAOs) of a semi submersible unit are inspected. Both operational and survival condition as well as a shallow draft are inspected. The survival condition is inspected with respect to ... -
Time-domain fatigue response and reliability analysis of offshore wind turbines with emphasis on welded tubular joints and gear components
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:331, Doctoral thesis, 2012)Presently fixed support structures are mainly used in the offshore wind industry, e.g. monopile, tripod, gravity base, et al., where the water depth are usually less than 30 m. Research work is ongoing for deeper water ... -
A Modular Design Methodology for OSV Accommodation Areas
(Master thesis, 2012)Offshore shipbuilding industry is known for its highly customized products, which are in most cases tailor-made for specific missions. Being a traditionally conservative industry, it follows conventional design practices. ... -
Fatigue Analysis of Column-Brace Connection in a Semi-submersible Wind Turbine
(Master thesis, 2012)The importance of offshore renewable energy from wind is expected to increase in the future. Most offshore wind turbines are currently installed in shallow water up to 50 meter water depth on bottom mounted substructures. ... -
Clump-weight trawl gear interaction with submarine pipelines
(Master thesis, 2012)Clump weights come in several shapes, with a mass generally between 2 to 9 tons [5]. With extensive oshore development in the last decades, vast networks of pipelines are installed on the sea bottom. With both pipeline ... -
Application of Particle Image Velocimetry on turbulent marine flows
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:236, Doctoral thesis, 2012)This thesis presents Particle Image Velocimetry (PIV) as a technology for whole-field, non-intrusive measurements of fluid motion in the context of marine technology research. It explains the basic theoretical background ... -
Analysis and Design of Columns in Offshore Structures subjected to Supply Vessel Beam Collisions
(Master thesis, 2012)During this Master Thesis, leg-segments of jacket platforms subjected to supply vessel impacts have been considered. Finite element analyses (FEA) have been conducted using the explicit solver LS DYNA. The FEA results have ... -
Fatigue in Jacket Structures With Impaired Integrity
(Master thesis, 2012)Present regulations for offshore structures on the Norwegian continental shelf havea requirement for Accidental Limit State redundancy and Fatigue Limit State redundancyin a damaged state. However, the requirement is far ... -
Development and Implementation of Computer-Based Control System for ROV with Experimental Results
(Master thesis, 2012)The demand for ROV operations has increased the last couple of decades. Still, operations are heavily dependent on an experienced ROV pilot, but by developing a sophisticated control system, operations can be performed ... -
Wave Conditions for Offshore Wind Turbine Foundations in Intermediate Water Depths
(Master thesis, 2012)In this thesis, the effects on regular waves when propagating from deep to shallow water have been investigated, assuming linear wave theory. The effects of shoaling, refraction, reflection and diffraction have been studied. ... -
Sea State Limitations for the Deployment of Subsea Compression Station Modules
(Master thesis, 2012)Deployment of a large box structure in many sea states has been investigated. Two deployment methods are compared; crane installation over the side and through moonpool installation. The structure is 12 [m] long, 6 [m] ... -
Hydrodynamic Analysis for a Logistical HUB
(Master thesis, 2012)The conventional way of transporting personnel from shore to offshore platforms is done by helicopter. For large distances of transportation this results in high costs due to the limitations in the maximum number of persons ... -
Conceptual Design of Surface Buoy for Arctic Conditions
(Master thesis, 2012)Due to a rising interest in oil exploration in Arctic areas several new platform designs have been introduced to combat the problems with level ice loads. This has led to research into ice strengthening and how this affects ...