Blar i NTNU Open på forfatter "Skjetne, Roger"

Viser treff 61-80 av 184

    • DP autotuning by use of derivative-free optimization 

      Løvås, Håvard Snefjellå (Master thesis, 2019)
      Denne avhandlingen presenterer utviklingen av en autonom tuningmetode for en dynamisk posisjoneringskontroller. Metoden er implementert i Marine Cybernetics Laboratory (MC-Lab) på 1:90-modellen av et dynamisk posisjoneringsfartøy, ...

    • DP Control System for Blueye Pioneer 

      Pauline Røstum Bellingmo (Master thesis, 2020)
      I denne masteroppgaven er et feil-tolerant dynamisk posisjonering (DP) kontrollsystem utviklet for undervannsdronen Blueye Pioner. For å kunne utvikle kontrollsystemet er relevant informasjon og egenskaper relatert til ...

    • DSA-inspired assessment of autonomous ships stability during turning maneuver 

      Krata, Przemyslaw; Hinz, Tomasz; Marley, Mathias Huuse; Dugan, Spencer August; Gil, Mateusz; Montewka, Jakub; Skjetne, Roger (Chapter, 2022)
      Assessing the stability of autonomous ships is challenging due to a lack of crew ensuring situational awareness, experience and good seamanship, which have contributed to safety of navigation to date. Therefore, a comprehensive ...

    • Dynamic fault-detection in shipboard electric load sharing. 

      Krogseth, Ida Bohne (Master thesis, 2013)
      The main contribution of this thesis is an investigation of dierent fault detection systems that canbe used for marine diesel electric power plants.The motivation of this thesis is to develop fault detection systems that ...

    • Dynamic Model Predictive Control for Load Sharing in Electric Power Plants for Ships 

      Bø, Torstein Ingebrigtsen (Master thesis, 2012)
      The main contribution of this thesis is an investigation of model predictive control(MPC) for marine diesel electric power plants. Recommendations and new ideasfor further development are emphasized.The motivation of the ...

    • Dynamic Positioning of Marine Vessels in Ice 

      Kjerstad, Øivind Kåre Kjerstad (Doctoral thesis at NTNU;2016:168, Doctoral thesis, 2016)
      This thesis is a collection of papers focusing on various aspects of dynamic positioning of marine vessels in ice. Most emphasis is put on the dynamic broken, or managed, sea-ice environment where pioneering operations ...

    • Dynamic positioning operations performed in ice 

      Skodje, Johan Ketil (Master thesis, 2011)
      A two-dimensional broken ice model is implemented, including a collision detection and resolving system for ice interactions, using conservation of momentum. A simulation of the model has been done to evaluate the dynamics ...

    • Dynamic Simulation and Control of an Active Roll Reduction System Using Free-Flooding Tanks With Vacuum Pumps 

      Xu, Jiafeng; Ren, Zhengru; Li, Yue; Skjetne, Roger; Halse, Karl Henning (Journal article; Peer reviewed, 2018)
      Ship roll motion is critical for offshore operations due to its lack of damping mechanism. This paper demonstrates a dynamic simulation scheme of an active roll reduction system using free-flooding tanks controlled by ...

    • Dynamic Simulation and Control of an Active Roll Reduction System Using Free-Flooding Tanks With Vacuum Pumps 

      Xu, Jiafeng; Ren, Zhengru; Li, Yue; Skjetne, Roger; Halse, Karl Henning (Chapter; Peer reviewed, 2017)
      Ship roll motion is often the critical factor for offshore operations due to its lack of damping mechanism. This paper demonstrates a dynamic simulation scheme of an active roll reduction system using free-flooding tanks ...

    • Dynamic Thrust Allocation 

      Gottschal, Espen Joris (Master thesis, 2014)
      The purpose of this Thesis is to research the literature of thrust allocation, thruster modelling and maneuvering design, as well as to design and simulate various dynamic thrust allocation algorithms. Vessels with dynamic ...

    • Effect of Time Delays and Sampling in Force Actuated Real-Time Hybrid Testing; A Case Study 

      Ueland, Einar Skiftestad; Skjetne, Roger (Chapter, 2017)
      This paper presents a study where real-time hybrid testing is applied on a double mass-damper-spring system. Simulations show how delays and sampling terms affect the system both when it is subjected to excitations forces ...

    • Experimental and Numerical Investigation of a Double-Acting Offshore Vessel Performance in Level Ice 

      Su, Biao; Skjetne, Roger; Berg, Tor Einar (Journal article; Peer reviewed, 2014)
      In this paper a numerical model and experimental data are used to investigate the level ice performance of a double-acting intervention vessel. The icebreaking capability and maneuverability in level ice are analyzed by ...

    • Fast onboard detection of ice drift changes under stationkeeping in ice 

      Heyn, Hans-Martin; Skjetne, Roger (Peer reviewed; Journal article, 2022)
      Early detection of ice drift changes is essential for safe stationkeeping in ice-infested waters. This paper presents a conceptual system allowing onboard detection of ice drift changes in managed and unmanaged ice using ...

    • Fault Tolerant Control of Thruster-Assisted Position Mooring System 

      Ren, Zhengru (Master thesis, 2015)
      This thesis fo cu ses on the fau lt-to lerant control al gor ithm o f the thr u ster-assiste d posi tio n moor ing system ( TAPM). TAPM is an energy-efficient and reliable stationkeeping method for deep water structures. ...

    • Fault-tolerant Observer Design 

      Mokleiv, Børge (Master thesis, 2017)
      This master thesis dealt with the development of a fault-tolerant model-based observer for a low-cost ROV developed by BluEye Robotitcs, P2-Alpha. The observer was developed for 4 degrees of freedom (DOFs) using the installed ...

    • Feil-tolerant dynamisk posisjonering for den autonome testplattformen ReVolt 

      Abrahamsen, Brynjar (Master thesis, 2019)
      Eit feiltolerant kontrollsystem for dynamisk posisjonering av DNV GLs modellskip ReVolt har vorte utvikla, med mål om å kunne diagnostisere og handtere sensor- og aktuatorfeil som kan oppstå. Delar av implementasjonen ...

    • Force actuated real-tme hybrid model testing of a moored vessel: A case study investigating force errors 

      Ueland, Einar Skiftestad; Skjetne, Roger; Vilsen, Stefan Arenfeldt (Journal article; Peer reviewed, 2018)
      This paper presents a study where real-time hybrid testing is used to emulate a moored barge. The barge is modelled physically while the mooring forces are simulated numerically and actuated onto the physical substructure. ...

    • Force Field Identification and Positioning Control of an Autonomous Vessel using Inertial Measurement Units 

      Udjus, Guttorm (Master thesis, 2017)
      In this thesis, a system of four sensors for measuring tri-axis translational accelerations and rotational velocities is designed. The sensors were mounted with a spatial distribution on board the ship model C/S Arctic ...

    • Force Tracking Using Actuated Winches with Position-Controlled Motors for Use in Hydrodynamical Model Testing 

      Ueland, Einar Skiftestad; Sauder, Thomas Michel; Skjetne, Roger (Peer reviewed; Journal article, 2021)
      In this paper, we consider the problem of accurate force control using actuated winches, intended for use in real-time hybrid hydrodynamic model testing. The paper is also relevant to other cable-driven parallel robot ...

    • Force-Based Real-Time Hybrid Testing: Force Actuation System 

      Hamland, Truls (Master thesis, 2017)
      Real-time hybrid model testing is the name given to the real-time coupling of experimental and numerical testing methods. It is based on dividing complex structures into two system parts; one that is simulated numerically, ...