Blar i SINTEF Open på forfatter "Sørensen, Asgeir Johan"

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    • Active truncation of slender marine structures: Influence of thecontrol system on Fidelity 

      Sauder, Thomas Michel; Marelli, Stefano; Larsen, Kjell; Sørensen, Asgeir Johan (Journal article; Peer reviewed, 2018-05)
      Performing hydrodynamic model testing of ultra-deep water floating systems at a reasonable scale ischallenging, due to the limited space available in existing laboratories and to the large spatial extent ofthe slender ...

    • Adaptive Wave Filtering for Dynamic Positioning of Marine Vessels Using Maximum Likelihood Identification: Theory and Experiments 

      Hassani, Vahid; Sørensen, Asgeir Johan; Pascoal, Antonio (Chapter, 2013)
      This paper addresses a filtering problem that arises in the design of dynamic positioning systems for ships and offshore rigs subjected to the influence of sea waves. The dynamic model of the vessel captures explicitly the ...

    • Controller Analysis in Real-Time Hybrid Model Testing of an Offshore Floating System 

      Vilsen, Stefan Arenfeldt; Sauder, Thomas Michel; Føre, Martin; Sørensen, Asgeir Johan (ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, Volume 7B: Ocean Engineering;OMAE2018-77859,, Chapter, 2018-06-25)
      This paper presents an experimental study using Real-Time Hybrid Model (ReaTHM) testing of a moored floating cylindrical buoy, conducted in a wave basin. ReaTHM testing is a method for studying the dynamics of marine ...

    • Detection of mooring line failures using Dynamic Hypothesis Testing 

      Hassani, Vahid; Pascoal, António M.; Sørensen, Asgeir Johan (Journal article; Peer reviewed, 2018-07-01)
      This article proposes a novel methodology for the detection of mooring line breakage in thruster assisted position mooring (PM) systems, when no measurements of the tensions on the mooring lines are available. For dynamic ...

    • Experimental study of current forces and deformations on a half ellipsoidal closed flexible fish cage 

      Strand, Ida Marlen; Sørensen, Asgeir Johan; Volent, Zsolt; Lader, Pål (Journal article; Peer reviewed, 2016-08)
      Closed flexible fish cages are proposed as a new concept in marine aquaculture, replacing the conventional net cages in order to meet ecological challenges related to fish lice and escapes. It is important to understand ...

    • HYPSO-1 CubeSat: First Images and In-Orbit Characterization 

      Bakken, Sivert; Henriksen, Marie Bøe; Birkeland, Roger; Langer, Dennis David; Oudijk, Adriënne Esmeralda; Berg, Simen; Pursley, Yeshi; Garrett, Joseph Landon; Gran-Jansen, Fredrik; Honoré-Livermore, Evelyn; Grøtte, Mariusz Eivind Santora; Kristiansen, Bjørn Andreas; Orlandic, Milica; Gader, Paul; Sørensen, Asgeir Johan; Sigernes, Fred; Johnsen, Geir; Johansen, Tor Arne (Journal article; Peer reviewed, 2023)
      The HYPSO-1 satellite, a 6U CubeSat carrying a hyperspectral imager, was launched on 13 January 2022, with the Goal of imaging ocean color in support of marine research. This article describes the development and current ...

    • Path Following Control of Underactuated Surface Vessels in the Presence of Multiple Disturbances 

      Caharija, Walter; Sørensen, Asgeir Johan; Pettersen, Kristin Ytterstad; Greco, Marilena; Gravdahl, Jan Tommy (Chapter, 2019-06-25)
      An integral version of the line-of-sight guidance method is shown to compensate for both kinematic and dynamic disturbances generated by wind, waves and sea currents. The guidance law is designed for path following tasks ...

    • Probabilistic robust design of control systems for high-fidelity cyber–physical testing 

      Sauder, Thomas Michel; Marelli, Stefano; Sørensen, Asgeir Johan (Journal article; Peer reviewed, 2019-03)
      Cyber–physicalempirical methods consist in partitioning a dynamical system under study into a set of physical and numerical substructures that interact in real-time through a control system. In this paper, we define and ...

    • Real-Time Hybrid Model Testing of a Top Tensioned Riser: a Numerical Case Study on Interface Time-Delays and Truncation Ratio 

      Sauder, Thomas Michel; Sørensen, Asgeir Johan; Larsen, Kjell (ASME 2017;OMAE2017-62498, Chapter, 2017)
      This paper investigates the applicability of real-time hybrid model testing (ReaTHM testing) to the study of offshore systems in deep water. The focus is in particular on slender marine structures connecting floating ...

    • Robust Dynamic Positioning of offshore vessels using mixed-μ synthesis modeling, design, and practice 

      Hassani, Vahid; Sørensen, Asgeir Johan; Pascoal, A.M.; Athans, Michael (Journal article; Peer reviewed, 2017-01-31)
      This paper describes a procedure to design robust controllers for Dynamic Positioning (DP) of ships and offshore rigs subjected to the influence of sea waves, currents, and wind loads using H∞ and mixed-μ techniques. The ...