Institutt for marin teknikk: Recent submissions

Now showing items 21-40 of 3421

    • The Influence of the Rake Angle on the Cutting of Low-Lead and Lead-Free Brass Alloys 

      Müller, Magdalena Susanne; Sørby, Knut (Chapter, 2023)
      Components manufactured from brass alloys are widely used in plumbing systems. Traditionally, lead is added to the alloy to improve the machinability. In recent years, the use of lead has been restricted due to health and ...

    • Hydroelastic response of a flexible spar floating wind turbine: Numerical modelling and validation 

      Ran, Xiaoming; Vincent, Leroy; Bachynski-Polic, Erin Elizabeth (Journal article; Peer reviewed, 2023)
      This study examines the hydroelastic response of a large floating wind turbine (FWT) through coupled numerical analysis. Four numerical models with different levels of complexity in the hydrodynamic and structural modelling ...

    • Overview of the potential of floating wind in Europe based on met-ocean data derived from the ERA5-dataset 

      Messmer, Thomas; Ran, Xiaoming; Benifla, Victor; Lutz, Marco; Adam, Frank; Bachynski-Polic, Erin Elizabeth; Hölling, Michael (Journal article; Peer reviewed, 2023)
      This paper provides an overview of the potential of floating wind in Europe. Wind and wave data from the ERA5 dataset as well as bathymetry data are analysed to identify regions suitable for floating wind deployment. The ...

    • Green Smart Port Energy System Design: Optimal Sizing 

      D’Agostino, Fabio; Kaza, Daniele; Silvestro, Federico; Conte, Francesco; Rrukaj, Ritvana; Zadeh, Mehdi (Journal article; Peer reviewed, 2023)
      The paper proposes an optimal sizing methodology for a green smart port with the presence of renewable energy resources and two energy carriers: electricity and hydrogen. The problem solution provides the optimal size of ...

    • Flow over a single shallow dimple 

      Zhu, Jianxun; Tian, Cai; Holmedal, Lars Erik (Peer reviewed; Journal article, 2024)

    • Accuracy of a slew maneuver for the HYPSO-1 hyperspectral imaging satellite — in-orbit results 

      Kristiansen, Bjørn Andreas; Langer, Dennis David; Garrett, Joseph Landon; Berg, Simen; Gravdahl, Jan Tommy; Johansen, Tor Arne (Peer reviewed; Journal article, 2023)
      In this paper, the accuracy of a slew maneuver performed by the HYPSO-1 satellite is analysed based on the data received during the satellite’s first months in orbit. The slew maneuver, during which the satellite turns ...

    • Towards carbon-free mobility: The feasibility of hydrogen and ammonia as zero carbon fuels in spark ignition light-duty vehicles 

      Nguyen, Duc Duy; Turner, James W.G (Journal article; Peer reviewed, 2024)
      Global warming is a major environmental issue caused by the release of greenhouse gases, such as carbon dioxide into the atmosphere. Light-duty vehicles (LDVs) including passenger cars and light-duty trucks, are a significant ...

    • Advanced Biomass Conversion : Sustainable e-methanol production with enhanced CO2 utilization 

      Fernandes, Renston Jake; Nguyen, Duc Duy; Raghib Shakeel, Mohammad; Turner, James W.G (Journal article; Peer reviewed, 2024)
      Amid escalating concerns over climate change and emissions, this study presents a novel approach to develop sustainable fuels, leveraging advanced process modeling that uses waste CO2 streams from the biological ethanol ...

    • Committee V.1: Accidental Limit States 

      Quinton, Bruce WT; De luca, Gaetano; Topan, Firmandha; Mihkel, Kørgesaar; Le Sourne, Hervé; Nahshon, Ken; Notaro, Gabriele; parsa, Kourosh; Rudan, Smiljko; Suzuki, Katsuyuki; Banda, Osiris Valdez; walters, Carey; wang, deyu; Yu, Zhaolong (Chapter, 2023)
      Ships and offshore structures may be subject to accidental actions during their operation. Design for preventing or minimizing the effects of accidents is termed accidental limit states (ALS) design and is characterized ...

    • Human-autonomy collaboration in supervisory risk control of autonomous ships 

      Johansen, Thomas; Utne, Ingrid Bouwer (Journal article; Peer reviewed, 2024)
      This paper presents a method for developing and testing a risk-based control system, as a first step towards including the human supervisor explicitly in the design of the system. The result is a control system with improved ...

    • Survey report for CRIMAC SFI 2023 

      Handegard, Nils Olav; Allken, Vaneeda; Holmin, Arne Johannes; Johnsen, Espen; Korneliussen, Rolf; Pedersen, Geir; Skjefstad, Joakim; Rogge, Rabea Patricia; Samuelsen, Mikal Arntzen; Tenningen, Maria; Sivle, Lise Doksæter (Toktrapport;, Research report, 2024)
      This cruise report describes the objectives, methods, and preliminary results from the tasks carried out at the CRIMAC SFI survey. The survey was conducted on board RV G.O. Sars between November 15th (Tromsø) and November ...

    • Three-Dimensional Path Planning of Deep-Sea Mining Vehicle Based on Improved Particle Swarm Optimization 

      Lu, Changyu; Yang, Jianmin; Leira, Bernt Johan; Chen, Qihang; Wang, Shulin (Peer reviewed; Journal article, 2023)
      Three-dimensional path planning is instrumental in path decision making and obstacle avoidance for deep-sea mining vehicles (DSMV). However, conventional particle swarm algorithms have been prone to trapping in local optima ...

    • Examination of environmental lumping methods for fatigue assessment of floating wind turbines 

      Henskens, Aaron (Master thesis, 2023)
      Flytende turbiner utgjør et nytt forskningsfelt innenfor havvind, en ung bransje i seg selv. Etterspørselen etter havvindturbiner vil sannsynligvis øke betydelig i de kommende tiårene. Mens bunnfaste turbiner generelt er ...

    • Experimental and finite element analysis of fatigue strength for 300 mm2 copper power conductor 

      Nasution, Fachri Panusunan; Sævik, Svein; Berge, Stig (Journal article; Peer reviewed, 2014)
      The fatigue strength of a 300 mm2 stranded copper conductor was investigated experimentally and by finite element (FE) analysis. An analytical model was also developed and validated. Wires taken from the outer layer of the ...

    • Marine Operations in Arctic conditions 

      Gudmestad, Ove Tobias; Døskeland, Øystein Husevåg (Peer reviewed; Journal article, 2023)
      Marine operations require careful early planning and thereafter detailed planning prior to project execution. The time from initiating an operation to finalization of the activity is typically several days. The activity ...

    • Weather optimal dynamic positioning of underactuated AUVs using output feedback control 

      Refsnes, Jon E Gorset; Sørensen, Asgeir Johan; Pettersen, Kristin Ytterstad (Journal article, 2006)
      In this paper we present an output feedback control system for dynamic positioning of underactuated AUVs. The control objective is to maintain a desired distance to the target while orienting the vehicle towards the target ...

    • Observer design for underwater vehicles with position and angle measurement 

      Refsnes, Jon E Gorset; Pettersen, Kristin Ytterstad; Sørensen, Asgeir Johan (Journal article, 2006)
      In this paper we propose a new observer system for underwater vehicles. The main design objective behind this strategy is to reduce the destabilizing effect of the Coriolis and centripetal forces and moments in the observer. ...

    • Effects of wind field characteristics on pitch bearing reliability: a case study of 5 MW reference wind turbine at onshore and offshore sites 

      Rezaei, Ashkan; Guo, Yi; Keller, Jonathan; Nejad, Amir R. (Peer reviewed; Journal article, 2023)
      This paper presents a study on pitch bearing basic rating life affected by wind field characteristics at both onshore and offshore wind sites. The National Renewable Energy Laboratory 5 MW reference wind turbine is selected ...

    • Effect of wind speed distribution and site assessment on pitch bearing loads and life 

      Rezaei, Ashkan; Nejad, Amir R. (Peer reviewed; Journal article, 2023)
      In this paper, the wind speed distribution at thirteen onshore and offshore wind sites has been studied. Different probability distributions are used to estimate the wind speed distribution. Several goodness-of-fit indicators ...

    • Integrating Software FMEA and STPA to Develop a Bayesian Network-Based Software Risk Model for Autonomous Ships 

      Yang, Xue; Zhu, Yawei; Zhou, Tao; Xu, Sheng; Zhang, Wenjun; Zhou, Xiangyu; Meng, Xiangkun (Peer reviewed; Journal article, 2023)
      The autonomous shipping industry is increasingly focusing on enhancing the safety and reliability of software-based systems. Conducting a risk assessment is a requirement for demonstrating the safety equivalence of autonomous ...