Browsing Institutt for marin teknikk by Title
Now showing items 2154-2173 of 3421
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Non-linear hydroelastic response of a monopile foundation in regular waves
(Peer reviewed; Journal article, 2020)This paper presents an original contribution to the coupled hydroelastic simulation of offshore wind turbines foundations. A non-linear coupled simulation tool has been developed to calculate the response of these systems. ... -
Non-linear Irregular Wave Impact on Monopile Structures
(Master thesis, 2016)This Master Thesis deals with non-linear wave impacts on monopile structures by introducing a potential flow solver named OceanWave3D (OCW3D) for simulating free surface waves and their kinematics under engineering ... -
NON-LINEAR SOIL MODELS FOR PIPELINE AND RISER ANALYSIS
(Master thesis, 2015)This thesis describes the development and application of non-linear soil models in pipeline and riser design. A non-linear soil model is typically employed when investigating a complex pipe-soil interaction problem. Two ... -
Non-linear time domain analysis of cross-flow vortex-induced vibrations
(Journal article; Peer reviewed, 2017)A previously proposed hydrodynamic load model for time domain simulation of cross-flow vortex-induced vibrations (VIV) is modified and combined with Morison's equation. The resulting model includes added mass, drag and a ... -
Non-Linear Time Domain Analysis of Deepwater Riser Vortex-Induced Vibrations
(Doctoral theses at NTNU;2022:178, Doctoral thesis, 2022)Fatigue analysis of marine risers due to vortex-induced vibrations (VIV) is normally based on semi-empirical frequency domain methods which only allow for linear structural models, excluding non-linear effects (e.g., tension ... -
Non-linear time domain analysis of vortex induced vibrations
(Master thesis, 2015)In this thesis a model for nonlinear analysis of vortex induced vibrations (VIV), applied to free spanning pipelines, is proposed. The developed model takes into account the soil-pipe interaction. Through case studies, ... -
A non-linear viscoelastic material model with progressive damage based on microstructural evolution and phase transition in polycrystalline ice for design against ice impact
(Peer reviewed; Journal article, 2023)This study presents a nonlinear viscoelastic material model incorporating a progressive damage framework with an iterative algorithm for glacial/freshwater polycrystalline ice subject to compressive impact load induced by ... -
Non-linear Wave Loads on Offshore Wind Support Structure
(Master thesis, 2014)Offshore wind development is constrained by its high cost. One potential way to meet this challenge is to reduce the uncertainty in wave modeling and hydrodynamic loads calculation for offshore wind support structures ... -
Non-Linear Wave-Body Interaction in Severe Waves
(Doctoral theses at NTNU;2019:173, Doctoral thesis, 2019)Offshore structures located in harsh environments may experience large wave loads and wave-induced responses. The present thesis documents a twodimensional numerical investigation of interactions between fixed or floating ... -
Nonlinear bending behavior of a multilayer copper conductor in a dynamic power cable
(Peer reviewed; Journal article, 2022)Reciprocating bending behavior is the main factor leading to the fatigue failure of dynamic power cables. However, in the research on the reciprocating bending behavior of dynamic cables, only the mechanical properties of ... -
Nonlinear bending behavior of a multilayer copper conductor in a dynamic power cable
(Journal article; Peer reviewed, 2022)Reciprocating bending behavior is the main factor leading to the fatigue failure of dynamic power cables. However, in the research on the reciprocating bending behavior of dynamic cables, only the mechanical properties of ... -
Nonlinear boundary-layer problems and laminar vortical stream generated by resonant sloshing in a circular- base tank
(Journal article; Peer reviewed, 2018)Suggesting a viscous incompressible liquid with laminar flows, nonlinear boundary-layer problems on the wetted tank surface (wall and bottom) of a rigid circular-base tank partly filled with a finite depth are derived ... -
Nonlinear Hydrodynamic Effects for Bottom-Fixed Wind Turbines
(Master thesis, 2013)This master thesis investigates possible effects from nonlinear wave loading onbottom fixed offshore wind turbines. The resonant phenomena springing andringing are reviewed with focus on their cause, and their possible ... -
Nonlinear local structural modelling and analysis of the interface for a hybrid wind and wave energy converter concept
(Journal article; Peer reviewed, 2016)A hybrid wind and wave energy converter concept, which consists of a spar floating wind turbine and a coaxial wave energy converter named the STC (Spar Torus Combination) concept, has been proposed to achieve better ... -
Nonlinear vertical accelerations of a floating torus in regular waves
(Journal article; Peer reviewed, 2016)The longitudinal motions and vertical accelerations of a floating torus as well as wave motion inside the torus are studied by model tests in regular deep-water waves. Comparisons are made with linear and partly with ... -
Nonlinear Wave Loads on a Vertical Cylinder
(Master thesis, 2018)Several authors have indicated discrepancies in the third load harmonic obtained by the inviscid FNV theory for computing higher order wave loads on vertical, non-moving, surface-piercing circular cylinders. The present ... -
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 ... -
Nonlinear Wave Loads, and Resulting Global Response Statistics of a Semi-Submersible Wind Turbine Platform with Heave Plates
(Doctoral theses at NTNU;2021:278, Doctoral thesis, 2021)Floating wind turbines (FWTs) are considered to be a promising way to harness the energy from winds over deep water and farther offshore. However, there are some challenges to bring this technology to full maturity. In ... -
Nordlaguna – A unique lake basin at the foot of the Beerenberg volcano, Jan Mayen, containing partially enigmatic sediments
(Peer reviewed; Journal article, 2022)Sediments from the only permanent lake on the island of Jan Mayen (71°N, 08°30′W), Lake Nordlaguna (NL), were investigated. The lake, with an area of ∼1 km2, is situated at the foot of the world's northernmost active ... -
Norwegian Aquaculture 2050: A Scenario Planning Analysis
(Master thesis, 2017)The objective of this thesis is to create a set of scenarios and action plans for the Norwegian aquaculture industry s development towards 2050. The purpose of doing this is to encourage the decision-makers within the ...