Blar i NTNU Open på forfatter "Skjetne, Roger"
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Four Degree-of-Freedom Hydrodynamic Maneuvering Model of a Small Azipod-Actuated Ship With Application to Onboard Decision Support Systems
Marley, Mathias Huuse; Skjetne, Roger; Gil, Mateusz; Krata, Przemyslaw (Peer reviewed; Journal article, 2023)The main contribution of this paper is a numerical ship motion model of NTNU’s research vessel Gunnerus, capturing the surge, sway, roll, and yaw dynamics when sailing in uniform and steady currents. The model utilizes a ... -
Genset scheduling in a redundant electric power system for an offshore vessel using mixed integer linear programming
Thorat, Laxminarayan; Skjetne, Roger; Osen, Ottar (Journal article, 2021)This paper proposes several schemes for optimal scheduling of power producers in a shipboard power system for a typical offshore supply vessel, having a multiple number of possibly varying capacity gensets. The proposed ... -
Guidance and control of iceberg towing operation in open water, with experimental testing
Sundland, Mika Nikolai (Master thesis, 2013)Icebergs pose serious threats to existing and planned offshore structures, vessels, and operations in Arctic waters such as the East Coast of Canada, East and West Greenland, the Barents Sea, and the Kara Sea. A collision ... -
A Guidance and Maneuvering Control System Design With Anti-Collision Using Stream Functions With Vortex Flows for Autonomous Marine Vessels
Zhou, Hongyu; Ren, Zhengru; Marley, Mathias; Skjetne, Roger (Peer reviewed; Journal article, 2022)Autonomous marine vessels are expected to avoid intervessel collisions and comply with the international regulations for safe voyages. This article presents a stepwise path planning method using stream functions. The dynamic ... -
Guidance Model Representing an Ice Field for Path-Planning in Ice Management
Bjørnø, Jon; Marley, Mathias; Skjetne, Roger (Chapter, 2020)In the work presented in this paper, the problem on how to represent a simplified ice field in a guidance model, enabling path and maneuver planning for IM operation, has been studied. The use of B-splines and other basis ... -
Hybrid Control to Improve Transient Response of Integral Action in Dynamic Positioning of Marine Vessels
Værnø, Svenn Are Tutturen; Skjetne, Roger (Journal article, 2015)A hybrid control approach for integral action in the PID control law for dynamically positioned marine vessels is considered. The proposed method is essentially a resetting of the integration gain when the 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 ... -
A hybrid kinematic controller for resilient obstacle avoidance of autonomous ships
Marley, Mathias; Skjetne, Roger; Breivik, Morten; Fleischer, Caroline (Peer reviewed; Journal article, 2020)Resilience is an important feature of autonomous systems. To be resilient, a control system must be stable, robust, and safe. This paper explores the use of hybrid feedback controllers to ensure robustness towards uncertainties ... -
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 ... -
Ice condition assessment using onboard accelerometers and statistical change detection
Heyn, Hans-Martin; Blanke, Mogens; Skjetne, Roger (Journal article; Peer reviewed, 2019)The presence of sea ice is the predominant risk for ship operations in the Arctic, and monitoring of ice condition around a vessel is crucial during all times of operation. This paper presents a system for online onboard ... -
Ice Detection and Tracking Based on Satellite and Radar Images
Larssen, Guro (Master thesis, 2015)The tracking and management of ice is a topic of great importance, due to the dangers these ice targets pose to vessels and marine structures. As the marine activity increase in ice affected areas, the motivation for ... -
Ice management and design philosophy
Ruud, Stian Knud; Skjetne, Roger (Chapter, 2018)Ice management (IM) is defined as all activities carried out with the objective of mitigating hazardous situations by reducing or avoiding actions from any kind of ice feature to a protected unit (e.g. a drilling vessel) ... -
Image Processing for Ice Floe Analyses in Broken-ice Model Testing
Zhang, Qin; Skjetne, Roger; Metrikin, Ivan; Løset, Sveinung (Journal article; Peer reviewed, 2015)The ice floe shape and size distribution are important ice parameters in ice-structure analyses. Before performing an analysis at full scale, the dynamic positioning (DP) experiments in model ice at the Hamburg Ship Model ... -
Image Techniques for Identifying Sea-Ice Parameters
Zhang, Qin; Skjetne, Roger (Journal article; Peer reviewed, 2014)The estimation of ice forces are critical to Dynamic Positioning (DP) operations in Arctic waters. Ice conditions are important for the analysis of ice-structure interaction in an ice field. To monitor sea-ice conditions, ... -
Improved user-experience for control of ROVs
Solstad, Torkil Eide (Master thesis, 2016)To make small size underwater Remotely Operated Vehicles(ROVs) more accessible for normal users efficient Human-Machine Interface(HMI) solutions are needed. In this theses two solutions are presented. One uses a Windows ... -
IMU-based sea state estimation using convolutional neural networks for DP vessels
Alfsen, Jens Nikolai (Master thesis, 2020)Oppgaven utforsker muligheten for sjøtilstandsestimering basert på målt skipsrespons. IMU sensorer installert flere steder på et DP skip muliggjør estimering av akselerasjonene til skipet, som videre kan brukes til å trene ... -
Integrated GNSS/IMU Hub Motion Estimator for Offshore Wind Turbine Blade Installation
Ren, Zhengru; Skjetne, Roger; Jiang, Zhiyu; Gao, Zhen; Verma, Amrit Shankar (Journal article; Peer reviewed, 2019)Offshore wind turbines (OWTs) have become increasingly popular for their ability to harvest clean offshore wind energy. Bottom-fixed foundations are the most used foundation type. Because of its large diameter, the foundation ... -
Integration between lidar- and camera-based situational awareness and control barrier functions for an autonomous surface vehicle
Solheim, Mathias Netland (Master thesis, 2022)Utviklingen av autonome overlatefarkoster har de siste årene sett betydelig fremgang, og ideen om et hel-autonomt skip er i ferd med å bli en virkelighet. En av de mest kritiske aspektene for å gjøre autonome skip suksessfulle, ... -
Integration Test Procedures for a Collision Avoidance Decision Support System Using STPA
Dugan, Spencer August; Skjetne, Roger; Wróbel, K.; Montewka, J.; Gil, M.; Utne, Ingrid Bouwer (Peer reviewed; Journal article, 2023)The transition from conventionally manned to autonomous ships is accompanied by the development of enhanced Decision Support Systems (DSS) for navigators. Such systems need to consider interactions among hardware, software, ... -
An Intelligent Power and Energy Management System for Fuel Cell/Battery Hybrid Electric Vehicle Using Reinforcement Learning
Reddy, Namireddy Praveen; Pasdeloup, David Francis Pierre; Zadeh, Mehdi Karbalaye; Skjetne, Roger (Journal article, 2019)Hybrid electric vehicles powered by fuel cells and batteries have attracted significant attention as they have the potential to eliminate emissions from the transport sector. However, fuel cells and batteries have several ...