Blar i NTNU Open på forfatter "Steen, Sverre"
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Identification of the geometric design parameters of propeller blades from 3D scanning
Njaastad, Eirik B; Steen, Sverre; Egeland, Olav (Peer reviewed; Journal article, 2022)This paper presents a new method for the identification of geometric design parameters of ISO 484 class propeller blades from scanned point cloud data. The method can be used for tolerance inspection and in-line measurement ... -
Impact Loads on Circular Cylinders
Larsen, Espen (Master thesis, 2013)In the past, testing of water impact problems such as breaking waves impacting on risers, lowering of subsea structures through the splash zone and free fall lifeboat performance has been carried out either by model tests ... -
Importance of Fluid-Structure Interaction on Dropped Lifeboats - A parametric study used to explore the importance of hydroelasticity on complex low rigidity structures using decision factors
Handeland, Michael Piccard (Master thesis, 2015)Experimental methods have previously been used in the design of lifeboats; this approach is both time-consuming and expensive. The experimental approach is suitable to find the loads and accelerations on an existing design; ... -
The importance of the engine-propeller model accuracy on the performance prediction of a marine propulsion system in the presence of waves
seattone, simone; Tavakoli, Sadi; Taskar, Bhushan; Vincent Jensen, Michael; Pedersen, Eilif; Schramm, Jesper; Steen, Sverre; Andersen, Poul (Peer reviewed; Journal article, 2020)The shipping industry is the heart of international trading activities and the global economy. Maritime transport contributes to environmental pollution through the emission of greenhouse gases. New mandatory regulations ... -
Improving “walk-to-work” gangway operation through ship design optimization
Vegsund, Monica (Master thesis, 2020) -
Including the Effect of Shielding in Prediction of Weather Window for Offshore Lifting Operations
Olsen, Camilla Waldum (Master thesis, 2015)The offshore industry is constantly seeking to operate in more extreme conditions. DeepOcean is a subsea service company, where offshore lifts is a part of every day operations. To remain competitive, it is important to ... -
Influence of a Wavefoil on the Wave Pattern Resistance of a Ship
Hagen, Benjamin Vist (Master thesis, 2018)The Reynolds-averaged Navier-Stokes equation has been numerically solved in order to study the interaction between the steady wave patterns of a wavefoil and ship hull, using the open source software OpenFOAM. Turbulence ... -
Investigation of Hydrodynamic Aspects of the Design of the Universal Buoyancy Concept (UBC) Loading Buoy
Knutsen, David Mikal (Master thesis, 2012)A new loading and discharge concept for ships, referred to as the Universal Buoyancy Concept (UBC), is proposed as an effective alternative to land based infrastructure for distribution of primarily LNG. The UBC system ... -
Investigation of Hydrodynamic Performance of a Twin-Screw Trawler Using CFD
Svoren, Nikolas Øksdal (Master thesis, 2015)Previously experimental methods or empirical knowledge laid the foundation for ship design. Performing a model test in a towing tank is time consuming and expensive. In addition to this, studying detailed effects in a ... -
Investigation of thrust loss due to steering while trawling
Åsbø, Dag Kristian (Master thesis, 2017)This thesis investigates the potential for a reduction in required propeller power by optimizing the transverse position of attachment points for trawl warps, simulating a system of movable trawl blocks. Full scale ... -
Loads on the Gravity-net-cage from Waves and Currents
Grue, Ida Håøy (Master thesis, 2014)Due to limited space close to shore and environmental concerns, the trend has become to move the fish farms to more exposed areas. This motivates the study of loads on the fish farm in more energetic currents and waves.In ... -
Mathematical Modelling of a Foil Propulsion System
Eitzen, Fridtjof Camillo (Master thesis, 2012)This thesis considers a foil propulsion system on a supply vessel. In analysing the potential of a foil propulsion system, it is imperative to establish a rigid mathematical model. In that respect, modelling of the dynamic ... -
A meta-model for added resistance in waves
Kim, YoungRong; Esmailian, Ehsan; Steen, Sverre (Peer reviewed; Journal article, 2022)In this paper, we perform a comprehensive study of various semi-empirical methods using publicly accessible experimental data on added resistance in waves with different ship types and conditions. Based on the analysis ... -
Modeling and analysis of performance and emissions of marine lean-burn natural gas engine propulsion in waves
Tavakoli, Sadi; Saettone, Simone; Steen, Sverre; Andersen, Poul; Schramm, Jesper; Pedersen, Eilif (Peer reviewed; Journal article, 2020)In many vessels, the prime mover is a diesel engine, while the researchers recommended using natural gas as an attractive option to comply with the latest emission legislations. This study aims to analyze the dynamic ... -
Modeling Operational Performance for the Global Fleet & Application of an Energy Saving Measure
Kim, Youngrong (Doctoral theses at NTNU;2023:88, Doctoral thesis, 2023)In order to reduce greenhouse gas emissions (GHG) from ships at sea, various measures have been considered, such as alternative fuels with low carbon intensity, innovative ship technology, and new policies. To successfully ... -
Modelling of Loads and Responses of a Permaskirt on a Flexible Net Cage Fish Farm
Stavnem, Ole Alexander (Master thesis, 2014)As the numbers of fish farms are increasing, the problems with lice are becoming of greater importance. The lice cause diseases and death, leading to loss in profit for the fish farms as well as reduction of the wild stock. ... -
A new method for optimal ship design in real sea states using the ship power profile
Esmailian, Ehsan; Steen, Sverre (Peer reviewed; Journal article, 2022)Typically, ships are designed for calm water and a constant design speed. However, a ship experiences different speeds and sea conditions over her lifetime. Following the significant correlations between environment and ... -
A new power prediction method using ship in-service data: a case study on a general cargo ship
Esmailian, Ehsan; Kim, Youngrong; Steen, Sverre; Koushan, Kourosh (Journal article; Peer reviewed, 2023)To increase energy efficiency and reduce greenhouse gas (GHG) emissions in the shipping industry, an accurate prediction of the ship performance at sea is crucial. This paper proposes a new power prediction method based ... -
A novel method for estimating missing values in ship principal data
Kim, YoungRong; Steen, Sverre; Muri, Helene (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 ... -
Numerical Modelling of Sailing Hydrofoil Boats
Bøe, Mikael (Master thesis, 2019)Motivasjonen til denne avhandlingen kommer fra ønsket om å lage en treningssimulator for erfarne seilere som ikke er kjent med hydrofoilfartøy. Siden en simulator kan være basert på flere typer numeriske metoder, blir en ...