Blar i Institutt for marin teknikk på tittel
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Islaster på en FPSO
(Master thesis, 2019)Denne masteroppgaven forklarer hvordan ekstreme islaster påvirker skroget på en FPSO lokalisert i isbelagte områder. En omfattende studie av isteori ble utført. Kunnskap om isfysikk og ismekanikk er viktig for å bedre kunne ... -
Isogeometric analysis with trimmed geometries applied to ship hulls
(Master thesis, 2018)This Paper aims to investigate Trimmed NURBS surfaces for Isogeometric Analysis(IGA). NURBS are Non-Rational B-spline functions which are widely used for geometric modelling in most Computer aided Design programs. This is ... -
Isogeometric collocation for implicit dynamics of three-dimensional beams undergoing finite motions
(Journal article; Peer reviewed, 2019)We propose a novel approach to the implicit dynamics of shear-deformable geometrically exact beams, based on the isogeometric collocation method combined with the Newmark time integration scheme extended to the rotation ... -
Isogeometric collocation for the Reissner–Mindlin shell problem
(Journal article; Peer reviewed, 2017)We present an isogeometric collocation formulation for the Reissner-Mindlin shell problem. After recalling the necessary basics on differential geometry and the shell governing equations, we show that the standard approach ... -
Isogeometric contact analysis: Implementation of a penalty based algorithm
(Master thesis, 2019)Strukturanalyse av gjensander som kommer i kontakt med hverandre er komplisert. Kontaktproblemer er ofte relatert til store deformasjoner og ettersom kontaktoverflaten ikke er kjent på forhånd, er de uunngåelig ikke-lineære. ... -
An isogeometric finite element-boundary element approach for the vibration analysis of submerged thin-walled structures
(Peer reviewed; Journal article, 2021)In this paper, the isogeometric formulations of the finite element and boundary element methods are applied to the dynamic analysis of thin-walled structures submerged in an infinite, inviscid, and incompressible fluid ... -
Isogeometric Kirchhoff-Love shell formulation for elasto-plasticity
(Journal article; Peer reviewed, 2018)An isogeometric thin shell formulation allowing for large-strain plastic deformation is presented. A stress-based approach is adopted, which means that the constitutive equations are evaluated at different integration ... -
Isogeometric Phase-Field Methods for Modeling Fracture in Shell Structures
(Doctoral theses at NTNU;2021:87, Doctoral thesis, 2021)The simulation of the fracture of engineering structures is a challenging topic that requires accurate and efficient numerical models. This thesis focuses on the modeling of brittle and ductile fracture in thin shell structures ... -
Isogeometric Structural Analysis of Wind Turbine Blades
(Master thesis, 2018)Isogeometric analysis, IGA, seeks to bridge the gap between engineering design and computational analysis by using spline functions as finite element bases in the analysis framework. The general concept can be applied to ... -
The ISSC 2022 committee III.1-Ultimate strength benchmark study on the ultimate limit state analysis of a stiffened plate structure subjected to uniaxial compressive loads
(Peer reviewed; Journal article, 2021)This paper presents a benchmark study on the ultimate limit state analysis of a stiffened plate structure subjected to uniaxial compressive loads, initiated and coordinated by the ISSC 2022 technical committee III.1-Ultimate ... -
ISUM for Offshore Frame Structures
(Chapter; Peer reviewed, 2016)The paper presents the background and major ideas behind the computer program USFOS. The program is today widely used by the offshore industry to assess the resistance of oil and gas installations against abnormal environmental ... -
Joint description of waves and currents applied in a simplified load case
(Journal article, 2018)In order to perform a more accurate analysis of marine structures, joint probability distributions of different metocean parameters have received an increasing interest during the last decade, facilitated by improved ... -
Joint Distribution of Environmental Condition at Five European Offshore Sites for Design of Combined Wind and Wave Energy Devices
(Journal article; Peer reviewed, 2015)The design of wind turbines requires information about joint data for wind and wave conditions. Moreover, combining offshore wind and wave energy facilities is a potential way to reduce the cost of offshore wind farms. To ... -
Joint Environmental Data at Five European Offshore Sites for Design of Combined Wind and Wave Energy Devices
(Chapter; Peer reviewed, 2013)The costs for an offshore wind farm, especially with bottom fixed foundations increase significantly with increasing water depth. If costs can be reduced to a competitive level, the potential for wind farms in deep water ... -
Joint Probability Distribution of Environmental Conditions for Design of Offshore Wind Turbines
(Chapter; Peer reviewed, 2017)The design process for offshore wind turbines includes a fatigue life evaluation of the structure with the relevant environmental conditions at the specified wind farm location. Such analyses require long-term distributions ... -
Jordmodeller og utmatning av fritthengende stigerør
(Master thesis, 2016)Denne masteravhandlingen omhandler utvikling og anvendelse av jordmodeller for beskrivelse av jord-stigerør interaksjon. På dypt vann, er jorda bestående av leire noe som introduserer sensitive parameterer. Det gjør ... -
Kalman estimation of position and velocity for ReaTHM testing applications
(Journal article; Peer reviewed, 2018)Offshore wind power research is a rapidly growing field, because of the present climate crisis and increasing focus on renewable energy. Model testing plays an important role in the risk and cost analysis associated with ... -
Key Contributors to Lifetime Accumulated Fatigue Damage in an Offshore Wind Turbine Support Structure
(Chapter; Peer reviewed, 2017)A simulation study is performed to identify the key contributors to lifetime accumulated fatigue damage in the support-structure of a 10 MW offshore wind turbine placed on a monopile foundation in 30 m water depth. The ... -
Key Performance Indicators Related to Maintenance
(Master thesis, 2010)In order to sustain and strengthen its market position, Teekay Petrojarl (TKPJ) finds it necessary to take a step farther into operational excellence. The purpose of this thesis is to study how Key Performance Indicators ... -
Kinematic Control of Underwater Robotic System
(Master thesis, 2016)Underwater robotic systems can be used for a variety of operations, from reparations of sub-sea installations, to perform inspections and surveys. Such operations will demand robust and fast kinematic control, if they were ...