Browsing Institutt for marin teknikk by Title
Now showing items 2163-2182 of 3421
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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 ... -
Norwegian national ship risk model
(Chapter, 2016)In recent years, the Norwegian Maritime Authority (NMA) have focused increasingly on risk-informed decision-making. Similarly, the Norwegian Coastal Administration (NCA) is also extending their use of risk analysis. In ... -
Note on estimating bed shear stress caused by breaking random waves
(Peer reviewed; Journal article, 2021)This note presents a method of how the bed shear stress caused by breaking random waves on slopes can be estimated. This is obtained by adopting the Sumer et al. (2013) bed shear stress formula due to spilling and plunging ... -
Note on seabed shear stress beneath bichromatic and bidirectional waves for large bed roughness
(Peer reviewed; Journal article, 2023)The seabed shear stress beneath bichromatic and bidirectional waves is presented. The approach is analytical using the constant time-invariant eddy viscosity representation of Christoffersen and Jonsson (1985) for rough ... -
A Novel Data-Driven Prediction Framework for Ship Navigation Accidents in the Arctic Region
(Peer reviewed; Journal article, 2023)Arctic navigation faces numerous challenges, including uncertain ice conditions, rapid weather changes, limited communication capabilities, and lack of search and rescue infrastructure, all of which increase the risks ... -
A novel design approach for estimation of extreme load responses of a 10-MW floating semi-submersible type floating wind turbine
(Journal article; Peer reviewed, 2022)Offshore structures are constructed to withstand extreme wind and wave-induced loads, so studying these extreme loads is vital as it allows offshore structures, e.g., wind turbines, to be designed and operated with minimal ... -
A novel hybridized metaheuristic technique in enhancing the diagnosis of cross-sectional dent damaged offshore platform members
(Peer reviewed; Journal article, 2019)Offshore jacket platforms are widely used for oil and gas extraction as well as transportation in shallow to moderate water depth. Tubular cross‐sectional elements are used to construct offshore platforms. Tubular cross ... -
A novel method for estimating missing values in ship principal data
(Peer reviewed; Journal article, 2022)Missing values in the fleet data set acquired in the marine sector reduce the data available for analysis, which can decrease the statistical power of the model and negatively affects the energy-efficient operation and ... -
Novel Modeling and Fatigue Analysis for Early-phase Design of a 15-MW FOWT
(Master thesis, 2022)I dag stilles det store forventninger til storskala og til ultraskala flytende havvindmøller på grunn av potensialet i høyere produksjonseffektivitet. Denne ideen er ønsket av det globale markedet, men begrenset av flere ... -
NTNU-FFI Cruise 2017 - Hugin Autonomy Integration (DUNE, T-REX)
(NTNU Cruise reports;, Research report, 2017)The following report describes the integration of a dedicated autonomy co-processor on FFI Hugin HUS. The integration was experimentally validated during a joint FFI-NTNU cruise in November 2017. The cruise in its entirety ...