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

Viser treff 41-60 av 130

    • Finite Element Modeling and Structural State Estimation of a Bottom Fixed Offshore Wind Turbine 

      Paust, Henrik Sogn (Master thesis, 2015)
      As a path to combine the world s growing energy demand with renewable green energy, in- creased use of offshore wind turbines has been seen as a viable solution. Unfortunately, the remote location and rough environment for ...

    • Full-Scale Sea Trials of a Motion Control System for ROVs Based on a High-Gain State Observer 

      Fernandes, Daniel de Almeida; Sørensen, Asgeir Johan; Donha, Décio Crisol (Journal article, 2014)
      This paper reports selected results from full-scale sea trials, along with the description of the digital version implemented in practice, of a Motion Control System (MCS) previously proposed by the authors in the ...

    • A Generalization of Synergistic Hybrid Feedback Control with Application to Maneuvering Control of Ships 

      Schmidt-Didlaukies, Henrik; Basso, Erlend Andreas; Sørensen, Asgeir Johan; Pettersen, Kristin Ytterstad (Chapter, 2022)
      This paper generalizes results on synergistic hybrid feedback control. Specifically, we propose a generalized definition of synergistic Lyapunov functions and feedbacks which allows the logic variable in traditional ...

    • Global Asymptotic Tracking for Marine Surface Vehicles using Hybrid Feedback in the Presence of Parametric Uncertainties 

      Basso, Erlend Andreas; Schmidt-Didlaukies, Henrik; Pettersen, Kristin Ytterstad; Sørensen, Asgeir Johan (Chapter, 2021)
      In this paper, we propose a hybrid adaptive feedback control law for global asymptotic tracking control for marine surface vehicles in the presence of parametric uncertainties. The hybrid feedback is derived from a family ...

    • Global Asymptotic Tracking for Marine Vehicles using Adaptive Hybrid Feedback 

      Basso, Erlend Andreas; Schmidt-Didlaukies, Henrik; Pettersen, Kristin Ytterstad; Sørensen, Asgeir Johan (Peer reviewed; Journal article, 2023)
      This paper presents an adaptive hybrid feedback control law for global asymptotic tracking of a hybrid reference system for marine vehicles in the presence of parametric modeling errors. The reference system is constructed ...

    • Guidance & Control Strategies for UUVs 

      Kørte, Steffen Østensjø (Master thesis, 2011)
      Focus on safety and effectiveness in the oil and gas industry has increased the need for advanced control system for underwater vehicles. For remotely operated vehicles (ROVs) effectiveness when conducting deep sea operation ...

    • Hardware-in-the-Loop Testing Systems for ROV Control Systems 

      Lauritzsen, Martin (Master thesis, 2014)
      The use of ROVs has increased in the last decades and today advanced underwater vehicles are used in a wide array of oshore, military and scientific applications. To further improve the usefulness of ROVs modern control ...

    • Hybrid controller concept for dynamic positioning of marine vessels with experimental results 

      Brodtkorb, Astrid H.; Værnø, Svenn Are Tutturen; Teel, Andrew R.; Sørensen, Asgeir Johan; Skjetne, Roger (Journal article; Peer reviewed, 2018)
      The next generation marine control systems will, as a step towards increased autonomy, have more automatic functionality in order to cope with a set of complex operations in unknown, challenging and varying environments ...

    • Hybrid marine power plants model validation with strategic loading 

      Rejani Miyazaki, Michel; Sørensen, Asgeir Johan; Vartdal, Bjørn J (Journal article, 2016)
      Recent advances in Energy Storage Devices (ESD) technology has enabled new supervisory control strategies for power generation and distribution on hybrid marine power plants, supported by new class society regulations. A ...

    • Hybrid modeling of strategic loading of a marine hybrid power plant with experimental validation 

      Rejani Miyazaki, Michel; Sørensen, Asgeir Johan; Lefebvre, Nicolas; Yum, Koosup; Pedersen, Eilif (Journal article; Peer reviewed, 2016)
      Recent developments in marine power systems, energy storage devices (ESDs) technology, and modification to rules and regulations increase the opportunities to improve efficiency and reduce emissions. One particular application ...

    • Hybrid Observer Combining Measurements of Different Fidelities 

      Brodtkorb, Astrid H.; Teel, Andrew R.; Sørensen, Asgeir Johan (Journal article; Peer reviewed, 2016)
      A signal-based hybrid observer combining measurements of different fidelities is proposed for position and velocity estimation of marine vessels. The concept assumes that noisy position measurements are available only ...

    • Hybrid observer concept for sensor fusion of sporadic measurements for underwater navigation 

      Bremnes, Jens Einar; Brodtkorb, Astrid Helene; Sørensen, Asgeir Johan (Peer reviewed; Journal article, 2020)
      Accurate underwater navigation systems are required for closed-loop guidance and control of unmanned underwater vehicles (UUV). This paper proposes a sensor-based hybrid translational observer concept for underwater ...

    • Hybrid observer for improved transient performance of a marine vessel in dynamic positioning 

      Brodtkorb, Astrid H.; Værnø, Svenn Are Tutturen; Teel, Andrew R.; Sørensen, Asgeir Johan; Skjetne, Roger (Journal article; Peer reviewed, 2016)
      Dynamic positioning (DP) systems are used on marine vessels for automatic station keeping and tracking operations solely by use of thrusters. Observers are key components of DP systems, and two main types are proposed in ...

    • Hybrid Tracking Controller for an ASV Providing Mission Support for an AUV 

      Fyrvik, Torbjørn Reitan; Bremnes, Jens Einar; Sørensen, Asgeir Johan (Peer reviewed; Journal article, 2022)
      Autonomous underwater vehicles (AUVs) rely on surface support for communication with operators and position fixes to bound inertial navigation errors. By installing an acoustic modem on an autonomous surface vehicle (ASV), ...

    • 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 (Peer reviewed; Journal article, 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 ...

    • Increasing the Operation Window of Dynamic Positioned Vessels Using the Concept of Hybrid Control 

      Brodtkorb, Astrid Helene; Sørensen, Asgeir Johan; Teel, Andrew R. (Chapter; Peer reviewed, 2014)
      In order to extend the operational window of marine vessels, the high-level control of the dynamic positioning (DP) system is revised. Major contributions of this paper include the modeling of a hybrid controller for a DP ...

    • Integral Line-of-Sight Guidance and Control of Underactuated Marine Vehicles: Theory, Simulations and Experiments 

      Caharija, Walter; Pettersen, Kristin Ytterstad; Bibuli, Marco; Calado, Pável; Zereik, Enrica; Braga, Jose; Gravdahl, Jan Tommy; Sørensen, Asgeir Johan; Milovanovic, Milan; Bruzzone, Gabriele (Journal article; Peer reviewed, 2016)
      This paper presents an extensive analysis of the integral line-of-sight (ILOS) guidance method for path-following tasks of underactuated marine vehicles, operating on and below the sea surface. It is shown that due to the ...

    • Integrated Environmental Mapping and Monitoring: A methodological approach for end-users 

      Nilssen, Ingunn (Doctoral theses at NTNU;2016:279, Doctoral thesis, 2016)
      Summary of thesis The thesis presents a methodological approach for flexible mapping and environmental monitoring that in each case are adjusted to purpose and the present ambient conditions, including anthropogenic ...

    • Integration Filter for APS, DVL, IMU and Pressure Gauge for Underwater Vehicles 

      Dukan, Fredrik; Sørensen, Asgeir Johan (Journal article, 2013)
      High-accuracy underwater navigation is important in order to automate motion control of remotely operated vehicles (ROVs). An observer that estimates the vehicle states (position, velocity, attitude and turn rates) is ...

    • Interactive hyperspectral data inspection during field operations 

      Langer, Dennis D.; Sørensen, Asgeir Johan; Johansen, Tor Arne (Peer reviewed; Journal article, 2022)
      Hyperspectral data cubes generated from hyperspectral cameras can be hard to inspect in during a field operation as the data is collected. This is due to the high spectral dimension of the data, resulting in large data ...