Blar i Institutt for marin teknikk på tittel
Viser treff 2174-2193 av 3421
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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 ... -
Numerical analysis of buckling failure in flexible pipe armor wires
(Journal article; Peer reviewed, 2015)Flexible pipes may be exposed to high axial compression and bending during deep-water installation. As the compression force is mainly sustained by the tensile armor layers, this may result in localized lateral or radial ... -
Numerical Analysis of Combined VIV and Slug Flow in Time Domain
(Chapter; Peer reviewed, 2016)Vortex induced vibrations (VIV) and slug flow are two important aspects for marine risers conveying a multiphase flow, and should be carefully examined due to the influence on the fatigue life of the structure. This article ... -
Numerical analysis of local and global responses of an offshore fish farm subjected to ship impacts
(Journal article; Peer reviewed, 2019)Due to limited nearshore areas and great impact to local ecosystems, the aquaculture industry is moving the fish farms into more exposed sea regions where the environmental conditions are much more severe. Like other ... -
Numerical Analysis of Mooring Systems for Floating Wind Turbines
(Master thesis, 2022)The world is progressing rapidly towards sustainable forms of energy, and the share of electrical energy produced from wind will grow exponentially in the coming years. Subsequently, floating wind turbines are moving towards ... -
Numerical analysis of pit-to-crack transition under corrosion fatigue using a stochastic pit generation algorithm
(Chapter, 2023)In numerical corrosion fatigue studies, the complex pit morphology is often idealized using an overly simplified geometry with a smooth surface because of the difficulties involved in modelling defects with the irregular ... -
Numerical analysis of pit-to-crack transition under corrosion fatigue using a stochastic pit generation algorithm
(Chapter, 2023)In numerical corrosion fatigue studies, the complex pit morphology is often idealized using an overly simplified geometry with a smooth surface because of the difficulties involved in modelling defects with the irregular ... -
Numerical analysis on the generation, propagation and interaction of solitary waves by a Harmonic Polynomial Cell Method
(Journal article; Peer reviewed, 2019)A numerical wave tank based on the Harmonic Polynomial Cell (HPC) method is created to study the generation, propagation and interaction of solitary waves. The HPC method has been proven to be of high accuracy and efficiency ...