Blar i Institutt for marin teknikk på tittel
Viser treff 2160-2179 av 3413
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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 ... -
Numerical & Experimental Studies on the Hydrodynamic Loads on Square-Shaped and Diamond-Shaped Cylinders in Close Proximity Exposed to a Forced Oscillatory Fluid Flow
(Master thesis, 2023)Denne oppgaven studerer de hydrodynamiske belastningene og kjølvannsinteraksjonen som oppleves av to eller flere sylindre i umiddelbar nærhet av hverandre utsatt for en tvunget harmonisk oscillerende strøm. Dette er først ... -
Numerical Analysis of a Floating Wind Turbine - Global Load Effects in the Tower Structure
(Master thesis, 2016)The OO Star 10 MW is a semi-submersible floater that aims to support a 10 MW wind turbine. It consists of three outer columns with a shaft in the centre. The floater is designed to be built from concrete, and a steel tower ... -
Numerical analysis of a vessel- shaped offshore fish farm
(Journal article; Peer reviewed, 2018)The aquaculture industry is aiming to move fish farms from nearshore areas to open seas because of many attractive advantages in the open water. However, one major challenge is to design the structure to withstand the ... -
Numerical Analysis of Anchor Handling and Fish Trawling Operations in a Safety Perspective
(Doctoral theses at NTNU;2016:166, Doctoral thesis, 2016)A vessel, with slender structures (like mooring line or wire) hanging from the sides or at the stern, handles or transfer objects from one place to another. This is a typical scenario in marine operations. Anchor ...