Browsing Institutt for marin teknikk by Journals "Ocean Engineering"
Now showing items 21-40 of 137
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Constrained multi-body dynamics for modular underwater robots — Theory and experiments
(Journal article, 2018)This paper investigates the problem of modelling a system of interconnected underwater robots with highly coupled dynamics. The objective is to develop a mathematical description of the system that captures its most ... -
Critical assessment of non-linear hydrodynamic load models for a fully flexible monopile offshore wind turbine
(Journal article; Peer reviewed, 2018)This paper presents a comparison between experimental data of a model-scale 4 MW monopile offshore wind turbine subjected to extreme irregular sea states in finite water and the numerical models suggested in offshore wind ... -
Decarbonizing bulk shipping combining ship design and alternative power
(Peer reviewed; Journal article, 2022)The Sixth Assessment Report by the Intergovernmental Panel on Climate Change (IPCC) stresses the urgency to rapidly reduce global Greenhouse Gas (GHG) emissions to contain global warming. The main focus in the design of ... -
Deriving spatial wave data from a network of buoys and ships
(Peer reviewed; Journal article, 2023)The real-time provision of high-quality estimates of the ocean wave parameters at appropriate spatial resolutions are essential for the sustainable operations of marine structures. Machine learning affords considerable ... -
Deriving the absolute wave spectrum from an encountered distribution of wave energy spectral densities
(Journal article; Peer reviewed, 2018)The objective of ship motion-based wave spectrum estimation is to provide the distribution of wave energy densities in absolute domain. However, as a ship generally advances relative to the progressing waves, any spectrum ... -
Design and comparative analysis of alternative mooring systems for floating wind turbines in shallow water with emphasis on ultimate limit state design
(Journal article; Peer reviewed, 2021)Floating wind turbines represent a cost-efficient energy solution in deep water where bottom-fixed wind turbine becomes excessively expensive. However, mooring design is quite challenging for all shallow water depths ... -
Detection of mooring line failures using Dynamic Hypothesis Testing
(Journal article; Peer reviewed, 2018)Abstract This article proposes a novel methodology for the detection of mooring line breakage in thruster assisted position mooring (PM) systems, when no measurements of the tensions on the mooring lines are available. For ... -
Determination of extreme responses of USFG’s equilibrium glide path hovering in ocean current
(Journal article; Peer reviewed, 2022) -
Development and application of a simulator for offshore wind turbine blades installation
(Journal article, 2018)In an offshore environment, offshore wind energy resources are more available and stable, but the investment cost is much higher than that of onshore wind. The installation cost is a crucial factor of the investment. With ... -
Development and validation of speed loss for a blunt-shaped ship in two rough sea voyages in the Southern Hemisphere
(Journal article; Peer reviewed, 2017)Maritime transportation is becoming increasingly complex owing to the fluctuation of oil prices, the introduction of environmental guidelines, and the onset of climate change. Although optimal routing has been researched ... -
Development of risk indicators for losing navigational control of autonomous ships
(Peer reviewed; Journal article, 2022)As autonomous ships become more viable, appropriate risk indicators are increasingly needed. In the existing literature, few works are related to developing such risk indicators. Existing indicators are general and not ... -
Discussion of assumptions behind rule-based ice loads due to crushing
(Journal article; Peer reviewed, 2016)Forecasts and trends indicate an increase in marine operations in polar waters. The design of new ships for severe polar conditions is usually solved via theoretical considerations that are combined with previous experience ... -
Discussion/comments regarding "Sea spray icing phenomena on marine vessels and offshore structures: Review and formulation" by A.R. Dehghani-Sanij, S.R. Dehghani, G.F. Naterer, Y.S. Muzychka
(Journal article; Peer reviewed, 2017)The purpose of this discussion is to demonstrate how the formula for the liquid water content in wind-generated seawater spray presented by Dehghani-Sanij et al. (2017) in conjunction with available wind speed statistics ... -
Dominant parameters for vortex-induced vibration of a steel catenary riser under vessel motion
(Journal article; Peer reviewed, 2017)Recent research has confirmed a new type of vortex-induced vibration (VIV) in steel catenary risers (SCRs), purely caused by vessel motion. Vessel motion-induced VIV occurs because the SCR is exposed to the equivalent ... -
Dynamic behavior of subsea wellhead and shallow pipe under seismic action
(Peer reviewed; Journal article, 2022)The interaction between shallow pipe and soil near the subsea wellhead is an important factor in the maintenance of subsea wellhead stability. First, a seismic test was conducted. A shaking table and a shear model box were ... -
Dynamic Positioning using Deep Reinforcement Learning
(Journal article; Peer reviewed, 2021)This paper demonstrates the implementation and performance testing of a Deep Reinforcement Learning based control scheme used for Dynamic Positioning of a marine surface vessel. The control scheme encapsulated motion control ... -
Dynamic probabilistic risk assessment of decision-making in emergencies for complex systems, case study: Dynamic positioning drilling unit
(Peer reviewed; Journal article, 2021)Decision-making in emergency situations is a risky and uncertain process due to the limited information and lack of time. Some key problem parameters, such as the time required to complete important response tasks, must ... -
Effect of floater flexibility on global dynamic responses of a 15-MW semi-submersible floating wind turbine
(Peer reviewed; Journal article, 2023)Floater structural flexibility plays a significant role in accurate predictions of global dynamic responses of floating wind turbines (FWTs), especially for ultra-large wind turbines with increasing size and cost-effective ... -
Effect of low temperature on fatigue crack propagation rates of DH36 steel and its butt weld
(Peer reviewed; Journal article, 2019)As common marine steel for polar ships, the fatigue crack propagation rates of DH36 steel at low temperature have a crucial influence on the evaluation of the fatigue strength of polar ships. The purpose of this paper is ... -
Effect of wave inhomogeneity on fatigue damage of mooring lines of a side-anchored floating bridge
(Peer reviewed; Journal article, 2020)Mooring systems are important structural components of very long floating bridges. They effectively limit the transverse motions of the bridge under environmental loads. They also add viscous hydrodynamic damping to the ...