• OMAE2017-62307 - Design Parameters for Increased Operability of Offshore Crane Vessels 

      Gutsch, Martin; Sprenger, Florian; Steen, Sverre (Chapter; Peer reviewed, 2017)
      Marine subsea operations are performed by highly specialized ships, referred to as Inspection, Maintenance, and Repair (IMR) and Offshore Construction Vessels (OCV). Although the ships and their on-board equipment are ...
    • Operability robustness index as seakeeping performance criterion for offshore vessels 

      Gutsch, Martin; Steen, Sverre; Sprenger, Florian (Peer reviewed; Journal article, 2020)
      The offshore industry operates increasingly large installations in exposed areas requiring high reliability and availability. Downtime of complex offshore systems leads to significant financial losses. Towards year-round ...
    • Optimal Ship Design for Operating in Real Sea States 

      Esmailian, Ehsan (Doctoral theses at NTNU;2023:118, Doctoral thesis, 2023)
      Currently, ship designers are under increased pressure to provide energy-efficient designs and reduce greenhouse gas emissions. For a long time, ships were mostly designed and optimized for operation in calm water. However, ...
    • Optimization of Bow Shape for Large, Slow Ships 

      Nordås, Daniel Edward (Master thesis, 2012)
      Traditionally ships have been optimized for minimizing the fuel consumption in calm water. For slow, large ships like tankers and bulk carriers this has resulted in very blunt bows with high added resistance due to waves. ...
    • Optimization of propeller pitch and revolutions in behind condition 

      Hasfjord, Steffen (Master thesis, 2014)
      To reduce costs and limit pollution from transportation of goods by sea, a method for optimization of the propulsive efficiency of an 8000 dead weight tonnage tanker is investigated. Emphasis is put on the interaction ...
    • Oscillating foil propulsion 

      Hauge, Jacob (Master thesis, 2013)
      Unsteady foil theory is discussed and applied on several cases of an oscillating foil. The oscillating foil is meant as a propulsion system for a platform supply vessel.Four case studies of foil oscillation have been ...
    • Potential energy savings of air lubrication technology on merchant ships 

      Kim, Youngrong; Steen, Sverre (Peer reviewed; Journal article, 2023)
      As the reduction of greenhouse gas emissions has become an important issue, measures and devices to reduce energy consumption are in increasing demand. In this study, the potential energy saving due to the application of ...
    • Predicting thrust loss of ship propellers due to ventilation and out-of-water effect 

      Kozlowska, Anna Maria; Savio, Luca; Steen, Sverre (Journal article; Peer reviewed, 2017)
      This paper presents a propeller ventilation model that is tuned on experiments performed in open water condition in a towing tank. The main purpose of performing the experiments was to obtain more data at higher advance ...
    • Prediction of Fuel Consumption of a Ship in Transit Using Machine Learning 

      Wahl, Jonas Munch (Master thesis, 2019)
      Denne masteravhandlingen presenterer en ny teknikk for drivstoffsprediksjon for skip i transitt som tar hensyn til eksterne miljømessige faktorer som strøm, vind og bølger. Blant de mange ytelsesovervåkingssystemene og ...
    • Prediction of increased fuel consumption due to fouling of hull and propeller 

      Norouzi, Sepideh (Master thesis, 2023)
      The escalating demand for shipping in recent decades, accompanied by the industry’s growing environmental footprint, has compelled numerous organizations and companies to explore effective decarbonization strategies. To ...
    • Prediction of Maneuverability on Double-Ended Ferry 

      Daniel Leinebø (Master thesis, 2020)
      Ein balanse mellom motstand og manøvrering av eit fartøy er ei utfordring som ofte vert møtt av skipsdesignarar. Dei siste åra har merksemda rundt grøn transport og moglegheita for alternativ drivstoff endra balansen, noko ...
    • Prediction of seakeeping abilities for the free-fall lifeboat FF1200 

      Imler, Christoph Johannes Thuen (Master thesis, 2012)
      In this thesis we have investigated seakeeping properties of Star CCM+. Star CCM+ is hoped to be used for simulations of the initial sailing phase of UMOE Schat Harding's new free fall lifeboat FF1200. It is a critical ...
    • Preparation of in-service measurement data for ship operation and performance analysis 

      Dalheim, Øyvind Øksnes; Steen, Sverre (Peer reviewed; Journal article, 2020)
      An increasing number of ships are being equipped with sensors and devices for monitoring of operational behavior, and the amount and access to operational data is gradually increasing. Due to various reasons described in ...
    • Rational calculation of sea margin 

      Magnussen, Anna Karina (Master thesis, 2017)
      The sea margin is an important parameter when designing a ship. The sea margin describes how much added power is required in operational conditions compared to the calm water conditions in order to maintain a speed in ...
    • Real-Time Hybrid Model Testing of Floating Wind Turbines 

      Chabaud, Valentin (Doctoral theses at NTNU;2016:369, Doctoral thesis, 2016)
      Offshore wind power is an active research topic motivated by today’s world energy crisis. While bottom-fixed turbines are relatively mature and commercially viable (though dependent on state-based subsidies to green energy), ...
    • Reliability Analysis of Crack Growth Occurrence for a Secondary Hull Component due to Vibration Excitation 

      Kleivane, Siri Kolle; Leira, Bernt Johan; Steen, Sverre (Peer reviewed; Journal article, 2024)
      Ship hull vibration is a significant contributor to fatigue crack growth and the major sources of vibrations are found to be the main engine vibration excitation, the wave-induced springing and whipping loads, and the ...
    • Reliability Analysis of Crack Growth Occurrence for a Secondary Structural Component due to Vibration Excitation 

      Kleivane, Siri Kolle; Leira, Bernt Johan; Steen, Sverre (Chapter, 2023)
      Ship hull vibration is a significant contributor to fatigue crack growth and the major sources of vibrations are found to be the main engine vibration excitation, the wave-induced springing and whipping loads, and the ...
    • Resistance due to open moonpools on offshore ships 

      Nesjø, Eirik Nubdal (Master thesis, 2015)
      A moonpool is a vertical well in a vessels hull that is exposed to the sea. Many types of offshore vessels are equipped with such a moonpool, to facilitate maritime operations. The water column inside of the moonpool is ...
    • Revitalization of short sea shipping through slender, simplified and standardized designs SMC-007-2016 

      Lindstad, Elizabeth; Eskeland, Gunnar; Sandaas, Inge; Steen, Sverre (Journal article; Peer reviewed, 2018)
    • Sail-induced resistance on a wind-powered cargo ship 

      Kramer, Jarle Vinje; Steen, Sverre (Peer reviewed; Journal article, 2022)
      This article explores the added resistance due to side forces from wingsails, called the sail-induced resistance. A cargo ship is tested with varying speed, appendages, number of sails, and control algorithms for the sails. ...