Blar i NTNU Open på forfatter "Steen, Sverre"
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Sea Passage Scenario Simulation for Ship System Performance Evaluation
Sandvik, Endre (Doctoral theses at NTNU;2019:265, Doctoral thesis, 2019)This thesis addresses evaluation of ship system operational performance exposed to ocean waves for providing enhanced evaluation capabilities in the transition towards environmentally friendly shipping. It proposes and ... -
Seakeeping capabilities of sailing cruise and passenger vessels
Tranell, Johanna (Master thesis, 2021)I 2018 annonserte FNs Sjøfartsorganisasjon et mål om å redusere utslipp av drivhusgasser med minst 50% fra 2008 til 2050. For å oppnå dette, er det avgjørende at industrien tar i bruk grønnere propulsjonssystemer. Mens det ... -
Sensitivity Analysis of large Rotor Diameter on Offshore Wind Turbines with Suction Foundation
Thomassen, Øystein Sunde (Master thesis, 2014)This thesis has an objective aimed at understanding the sensitivity of the support structure for an offshore wind turbine with bucket foundation as the turbines get larger. The focus has been on the response and forces on ... -
Sensitivity Analysis of large Rotor Diameter on Offshore Wind Turbines with Suction Foundation
Thomassen, Øystein Sunde (Master thesis, 2014)This thesis has an objective aimed at understanding the sensitivity of the support structure for an offshore wind turbine with bucket foundation as the turbines get larger. The focus has been on the response and forces on ... -
Ship design for real sea states under uncertainty
Esmailian, Ehsan; Steen, Sverre; Koushan, Kourosh (Peer reviewed; Journal article, 2022)A ship is designed under inescapable uncertainty. Neglecting important uncertainties might lead to suboptimal designs. Furthermore, to achieve the best possible performance, the ship design should be optimized for the ... -
Ship Performance Monitoring using In-service Measurements and Big Data Analysis Methods
Gupta, Prateek (Doctoral theses at NTNU;2022:101, Doctoral thesis, 2022)Ship performance monitoring is quite important for ship owners as well as charter parties to optimize their profits. Moreover, the regulatory organizations, like IMO, has also become interested here in order to maintain ... -
Simplified test program for hydrodynamic CFD simulations of wind-powered cargo ships
Kramer, Jarle Vinje; Steen, Sverre (Journal article; Peer reviewed, 2022)Four practical simplifications for modeling the hydrodynamic properties of a wind-powered cargo ship with CFD and a route simulation model is evaluated. We first test how much the drift-induced hull forces are dependent ... -
Simulation of a two-stroke diesel engine for propulsion in waves
Yum, Koosup; Taskar, Bhushan; Pedersen, Eilif; Steen, Sverre (Journal article; Peer reviewed, 2016)Propulsion in waves is a complex physical process that involves interactions between a hull, a propeller, a shaft and a prime mover which is often a diesel engine. Among the relevant components, the diesel engine plays an ... -
Speed and powering prediction for ships based on model testing
Øyan, Espen (Master thesis, 2012)The ITTC78 method was originally designed for conventional single screw ships, but has later been modified to adapt twin screw ships and podded propulsors. Nowadays even more unconvensional propulsors are introduced, and ... -
Statistical modeling of Ship’s hydrodynamic performance indicator
Gupta, Prateek; Taskar, Bhushan; Steen, Sverre; Rasheed, Adil (Peer reviewed; Journal article, 2021)The traditional method used to estimate the hydrodynamic performance of a ship uses either the model test results or one of the many empirical methods to estimate and observe the trend in fouling friction coefficient () ... -
Streamlined semi-automatic data processing framework for ship performance analysis
Gupta, Prateek; Kim, YoungRong; Steen, Sverre; Rasheed, Adil (Peer reviewed; Journal article, 2023)The hydrodynamic performance of a sea-going ship can be analyzed using data from different sources, like onboard recorded in-service data, AIS data, and noon reports. Each of these sources is known to have its inherent ... -
The effect of waves on engine-propeller dynamics and propulsion performance of ships
Taskar, Bhushan; Yum, Koosup; Steen, Sverre; Pedersen, Eilif (Journal article, 2016)This paper investigates the effect of waves on the propulsion system of a ship. In order to study the propulsion in different wave conditions, a procedure for wake estimation in waves has been implemented. A clear drop in ... -
The Effect of Waves on Marine Propellers and Propulsion
Taskar, Bhushan (Doctoral theses at NTNU;2017:106, Doctoral thesis, 2017)Ship design is evolving around ever-increasing market demands in quest of competitive and cost-effective solutions. The global increase of shipping activities has raised concerns regarding the environmental impact of sea ... -
The Efficiency of a Mewis Duct in Waves
Topphol, Rolf Arild (Master thesis, 2013)In this thesis, the efficiency of a Mewis Duct in waves has been investigated with the use of model tests in the large towing tank at MARINTEK in Trondheim. A ?load-varying? self-propulsion method was used, allowing for ... -
The influence of the choice of propeller design tool on propeller performance
Skåland, Edvard Knutsen (Master thesis, 2016)In this master thesis different propeller design and analysis methods are presented and compared in terms of the accuracy and computational efficiency of their theory. These methods include lifting line, vortex lattice ... -
The influence of using a ducted propeller on motions and speed loss of a ship in waves
Pan, Qi (Master thesis, 2013)Comparisons of experimental and numerical investigations into the effect of duct on motion variables and speed loss for a given ship model are presented. The purpose of these comparisons is to verify the advantage of using ... -
The potential energy savings by application of a wave foil on the autonomous container vessel ReVolt
Riley, Eivind Finne (Master thesis, 2015)ReVolt is an electrically propelled, autonomous concept container ship designed by DNV GL to minimize the energy consumption and cost; however, the added resistance in waves is a large resistance contributor. Effectively, ... -
Thrust loss due to interaction with ship hull and bottom for ships in shallow waters
Brage Møller-Pettersen (Master thesis, 2022)Målet med denne master avhandlingen er et klart svar på spørsmålet: \emph{Er det en spesifikk effekt, eller kombinasjon av flere som forekommer på grunt vann og forårsaker thrust tap?} Etter et relativt bredt litteratursøk ... -
Time Domain Modeling of Propeller Forces due to Ventilation in Static and Dynamic Conditions
Kozlowska, Anna Maria; Dalheim, Øyvind Øksnes; Savio, Luca; Steen, Sverre (Journal article; Peer reviewed, 2020)This paper presents experimental and theoretical studies on the dynamic effect on the propeller loading due to ventilation by using a simulation model that generates a time domain solution for propeller forces in varying ... -
Uncertainty in the real-time estimation of ship speed through water
Dalheim, Øyvind Øksnes; Steen, Sverre (Peer reviewed; Journal article, 2021)The ship speed through water (STW) is a critical variable for evaluation of ship performance. With a cubic relation to the expected shaft power, even small inaccuracies in measured STW amplifies to more considerable ...