Institutt for marin teknikk
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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 ... -
Power Plant Design Optimization at the Ship Preliminary Design Phase: 'Digital Twin to Design'
(Master thesis, 2021)Her presenteres en algoritme for å optimalisere skipskraftverk i startfasen av skipsdesignprossessen. Oppgaven etablerer strukturen for hvordan en skal avgjøre størrelsen på kraftverket om bord og identifiserer hvilke ... -
An Open-Source Python-Based Boundary-Element Method Code for the Three-Dimensional, Zero-Froude, Infinite-Depth, Water-Wave Diffraction-Radiation Problem
(Journal article; Peer reviewed, 2021)In this paper, a new open-source implementation of the lower-order, 3-D Boundary Element Method (BEM) of solution to the deep-water, zero Froude-number wave-body interaction problem is described. A validation case for ... -
Model-free anti-swing control of complex-shaped payload with offshore floating cranes and a large number of lift wires
(Peer reviewed; Journal article, 2021)Being one of the most commonly used offshore operations, offshore lifting operations become increasingly challenging due to the gradually growing size and weight of payloads. The research on automatic control in lifting ... -
Towards automated welfare monitoring of farmed salmon exploiting deep learning and computer vision
(Master thesis, 2021)Bevaring av fiskevelferd er et omfattende tema i oppdrettsnæringen. En industriell laksemerd kan inneholde så mange som 200 000 fisk, og det er utfordrende å overvåke velferden til denne mengden enkeltdyr. Manuelle ... -
Atmospheric Stability Effects on a Spar-Type Floating Wind Turbine
(Master thesis, 2021)Simuleringer av en flytende vindturbin av spar-type som støtter DTU 10 MW referanseturbin under monterte atmosfæriske forhold, utføres. Atmosfæriske forhold modelleres ved bruk av turbulente modeller anbefalt av IEC: ... -
Objektiv metode for dokumentasjon av støtskader på laks
(Master thesis, 2021)I denne masteroppgaven ble det gjort et forsøk på å etablere en objektiv metode for å dokumentere hvilke effekter støt mot oppdrettslaks har for fiskehelse og -velferd. En oppdrettslaks opplever fysiske støt i rørsystemene ... -
Design study of a vessel for the Arctic Scallop industry
(Master thesis, 2021)Målet med denne opgaven er å komme frem til design løsninger på et konseptuelt design nivå til et skip som skal benytte en ny type høstemetode for å høste Haneskjell. Dette er gjort med en systematisk tilnærming til ingeniør ... -
The domestic bulk fleet’s zero-emission potential based on hydrogen infrastructure development
(Master thesis, 2021)Innenriksflåten i Norge har en gjennomsnittsalder på 28 år og er derfor moden for en utskiftning. Norske myndigheter har satt et ambisiøst mål om å redusere utslippet fra den norske flåten med 50% innen 2030. For å nå dette ... -
OC6 Phase Ib: Validation of the CFD predictions of difference-frequency wave excitation on a FOWT semisubmersible
(Peer reviewed; Journal article, 2021)During the previous OC511 project, state-of-the-art mid-fidelity engineering tools for floating wind systems were found to consistently underpredict the nonlinear, low-frequency responses of semisubmersible offshore wind ... -
Experimental and numerical investigation of nonlinear diffraction wave loads on a semi-submersible wind turbine
(Peer reviewed; Journal article, 2021)In a severe sea state, nonlinear wave loads can excite resonant responses of floating wind turbines either at high (structural) or low (rigid body motions) natural frequencies. In the present work, a computational fluid ... -
Experimental and numerically obtained low-frequency radiation characteristics of the OC5-DeepCwind semisubmersible
(Peer reviewed; Journal article, 2021)Added mass and damping play a significant role in accurate prediction of floating wind turbine (FWT) motions, especially near the resonance frequencies. This paper investigates the still-water hydrodynamic characteristics ... -
Hydrogen in the maritime
(Book, 2021)Hydrogen in the maritime is a deliverable under IEA TCP Hydrogen and investigates the use of hydrogen as a fuel in shipping. -
Empirical estimation of low-frequency nonlinear hydrodynamic loads on moored structures
(Peer reviewed; Journal article, 2021)Low-frequency (LF) motions of floating structures are commonly modeled as the response of an oscillator to a second-order wave excitation. We present here an empirical method that reliably estimates the oscillators parameters ... -
Validation and application of nonlinear hydrodynamics from CFD in an engineering model of a semi-submersible floating wind turbine
(Peer reviewed; Journal article, 2021)Nonlinear hydrodynamics play a significant role in accurate prediction of the dynamic responses of floating wind turbines (FWTs), especially near the resonance frequencies. This study investigates the use of computational ... -
Numerical investigation of scour beneath pipelines subjected to an oscillatory flow condition
(Peer reviewed; Journal article, 2021)The present study carries out two-dimensional numerical simulations to investigate scour beneath a single pipeline and piggyback pipelines subjected to an oscillatory flow condition at a Keulegan–Carpenter (KC) number of ... -
Analysis of difference-frequency wave loads and quadratic transfer functions on a restrained semi-submersible floating wind turbine
(Peer reviewed; Journal article, 2021)One of the concerns regarding numerical simulation of floating wind turbines (FWTs) in waves is underprediction of resonant responses in the low-frequency range. In the present work, the difference-frequency wave loads on ... -
Atlantic cod (Gadus morhua) embryos are highly sensitive to short-term 3,4-dichloroaniline exposure
(Peer reviewed; Journal article, 2021)3,4-dichloroaniline (3,4-DCA) is one of the most widely produced anilines world-wide, used in plastic packaging, fabrics, pharmaceuticals, pesticides, dyes and paints as well as being a degradation product of several ... -
Condition Monitoring of Ship Propulsion Systems: State-of-the-Art, Development Trend and Role of Digital Twin
(Chapter, 2021)This paper describes the current implementations and development trends of condition monitoring as it pertains to ship propulsion systems. In terms of total incidents in the shipping industry in the last five years, failures ... -
Sustainable Power System Design for Green Shipping - a case study of a cruise ferry
(Master thesis, 2021)En bærekraftig utvikling for fremtiden har aldri vært mer relevant ettersom det globale miljøavtrykk fortsetter å vokse. En reduksjon av utslippene som truer det globale livet slik vi kjenner det i dag, er viktig for å ...
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