• Evaluation of Shipboard Wave Estimation Techniques Through Model-scale Experiments 

      Nielsen, Ulrik Dam; Galeazzi, Roberto; Brodtkorb, Astrid H. (Chapter, 2016)
      The paper continues a study on the wave buoy analogy that uses shipboard measurements to estimate sea states. In the present study, the wave buoy analogy is formulated directly in the time domain and relies only partly on ...
    • Line-of-Sight Path Following for Dubins Paths with Adaptive Sideslip Compensation of Drift Forces 

      Fossen, Thor I.; Pettersen, Kristin Ytterstad; Galeazzi, Roberto (Journal article; Peer reviewed, 2014)
      We present a nonlinear adaptive path-following controller that compensates for drift forces through vehicle sideslip. Vehicle sideslip arises during path following when the vehicle is subject to drift forces caused by ocean ...
    • Modelling and identification for control of gas bearings 

      Theisen, Lukas R. S.; Niemann, Hans Henrik; Santos, Illmar F.; Galeazzi, Roberto; Blanke, Mogens (Journal article; Peer reviewed, 2015)
      Gas bearings are popular for their high speed capabilities, low friction and clean operation, but suffer from poor damping, which poses challenges for safe operation in presence of disturbances Feedback control can achieve ...
    • Observer Backstepping Control for Variable Speed Wind Turbine 

      Galeazzi, Roberto; Gryning, Mikkel; Blanke, Mogens (Chapter; Peer reviewed, 2013)
      This paper presents an observer backstepping controller as feasible solution to variable speed control of wind turbines to maximize wind power capture when operating between cut-in and rated wind speeds. The wind turbine ...
    • Parametric Roll Resonance Monitoring using Signal-based Detection 

      Galeazzi, Roberto; Blanke, Mogens; Falkenberg, Thomas; Poulsen, Niels Kjølstad; Violaris, Nicos; Storhaug, Gaute; Huss, Mikael (Journal article; Peer reviewed, 2015)
      Extreme roll motion of ships can be caused by several phenomena, one of which is parametric roll resonance. Several incidents occurred unexpectedly around the millennium and caused vast fiscal losses on large container ...
    • Smart Sensor Based Obstacle Detection for High-Speed Unmanned Surface Vehicle 

      Hermann, Dan; Galeazzi, Roberto; Andersen, Jens Christian; Blanke, Mogens (Journal article, 2015)
      This paper describes an obstacle detection system for a high-speed and agile unmanned surface vehicle (USV), running at speeds up to 30m/s. The aim is a real-time and high performance obstacle detection system using both ...
    • Unmanned Water Craft Identification and Adaptive Control in Low-Speed and Reversing Regions 

      Theisen, Lukas Roy Svane; Galeazzi, Roberto; Blanke, Mogens (Journal article; Peer reviewed, 2013)
      This paper treats L1 adaptive hovering control of an unmanned surface vehicle in a station-keeping mode where a region of zero control authority and under-actuation are main challenges. Low-speed and reversing dynamics are ...