Blar i NTNU Open på forfatter "Skjetne, Roger"
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Comparison of Fuel Consumption on a Hybrid Marine Power Plant With Low-Power Versus High-Power Engines
Wu, Zhenying; Thorat, Laxminarayan; Skjetne, Roger (Chapter, 2018)In this paper, we are comparing fuel consumption on a case study hybrid marine power plant with diesel gensets and batteries. Optimization methods are used to find an optimal operating point for the gensets, under different ... -
Compensation of bias loads in dynamic positioning of marine surface vessels
Værnø, Svenn Are Tutturen; Brodtkorb, Astrid H.; Skjetne, Roger (Journal article; Peer reviewed, 2019)This paper investigates different methods for compensating the mean and slowly varying environmental loads, and unmodeled dynamics (bias loads) in dynamic positioning of marine vessels. Four different methods are compared; ... -
Condition monitoring and fault detection for marine battery energy storage systems
Cai, Yuxuan (Master thesis, 2021)Battery energy storage system (BESS) is widely applied in hybrid-electric and all-electric power and propulsion solutions to reduce fuel consumption and emissions in ships. To achieve optimal performance, it is necessary ... -
Constrained Optimal Thrust Allocation for C/S Inocean Cat I Drillship
Frederich, Preben (Master thesis, 2016)It is essential to have a good thruster system when it comes to offshore operations and dynamic positioning. Not only can this save fuel, but also make the vessel and operations safer. A good thruster system consists ... -
Control and Estimation of Wave Energy Converters
Brask, Annette Kristin (Master thesis, 2015)The increasing scarcity of fresh water threatens the well being of both humans and the environment. Wave power desalination is a method of producing freshwater that has been in the developing stages since 1970. One of the ... -
Control and Simulation of a Thruster-Assisted Moored Offshore Vessel in Sea-ice
Gjessing, Ivar Aleksander (Master thesis, 2015)The exploration of the northern seas is constantly raising new and interesting research topics in order to adapt our technology to handle this extraordinary harsh climate. Darkness, remoteness, cold and harsh weather, and ... -
Control-Oriented Modelling for the Conversion of Surface Vessels to Unmanned
Swan de Freitas, Caio (Master thesis, 2020)Kontrollorientert modellering er en metode som er i stand til å forenkle identifiseringen og tuningen av en matematisk modell for et fartøy. Metoden kan representere dynamikken til fartøy som opererer i et bredt utvalg av ... -
Data-driven modelling and estimation of losses in shipboard electrical power components based on machine learning
Helgesen, Simen Karlsen (Master thesis, 2022)Målet med denne oppgaven er å undersøke muligheten for å modellere kraftan- legg om bord på skip ved hjelp av maskinlæring På grunn av stadig strengere forskrifter fra marine autoritetsorganisasjoner og regjeringer verden ... -
Data-driven sea state estimation for a DP vessel based on distributed inertial measurement units
Slåttum, Sindre Sagsveen (Master thesis, 2021)I denne oppgaven blir en metode for å estimere parameterne i en sjøtilstand baser på akselerasjonsmålinger fra et skip på dynamisk posisjonering, uten foroverhastighet. IMU sensurere fordelt rundt i skipet gjør det mulig ... -
Data-driven simultaneous identification of the 6DOF dynamic model and wave load for a ship in waves
Ren, Zhengru; Han, Xu; Yu, Xingji; Skjetne, Roger; Leira, Bernt Johan; Sævik, Svein; Zhu, Man (Peer reviewed; Journal article, 2023)In marine operations, the performance of model-based automatic control design and decision support systems highly relies on the accuracy of the representative mathematical models. Model fidelity can be crucial for safe ... -
DC-DC Converter Control for Peak-Shaving in Shipboard DC Power System via Hybrid Control
Park, Daeseong; Zadeh, Mehdi; Skjetne, Roger (Chapter, 2020)For the stable operation of the shipboard hybrid DC power systems, the DC bus voltage should be controlled within the recommended range by the regulations. However, the challenge comes from the load variations, and it makes ... -
A Decentralized Droop-Based Power Management System for Ship Power Systems Using Hybrid Dynamical Systems Framework
Reddy, Namireddy Praveen; Skjetne, Roger; Papageorgiou, Dimitrios (Chapter, 2023)In maritime transport, inspired by the automobile sector, autonomy is gaining traction in parallel with decarbonization. One of the numerous challenges in realizing fully autonomous operation in shipping is to design a ... -
Development and application of a simulator for offshore wind turbine blades installation
Ren, Zhengru; Jiang, Zhiyu; Skjetne, Roger; Gao, Zhen (Journal article, 2018)In an offshore environment, offshore wind energy resources are more available and stable, but the investment cost is much higher than that of onshore wind. The installation cost is a crucial factor of the investment. With ... -
Development of a Digital Twin for the Marine Cybernetics Lab: 3D visualization and simulation, online monitoring, and remote control
Premraj, James (Master thesis, 2023)Fysisk testing av et autonomt system kan være dyrt og tidskrevende. Dette kan motvirkes ved å lage digitale tvillinger av fartøyene som kan testes i simulatorer. MC-laben (Marine Cybernetics lab) på Tyholt har forskjellige ... -
Development of C/S Jonny incorporating an adaptive autopilot with a velocity guidance safety layer
Kvebæk, Magnus Løvold (Master thesis, 2023)I denne oppgaven presenteres utviklingen av en ny modellbåt kalt C/S Jonny. Det var behov for en robust modellbåt i stand til å håndtere høyhastighets manøvreringsbaserte styrings- og kontrollalgoritmer, en rolle som C/S ... -
Development of C/S Jonny with optimal constrained thrust allocation
Elvenes, Stian André (Master thesis, 2023)Denne oppgaven presenterer utviklingen og byggeprosessen gjort for det nye laboratoriefartøyet til MC-lab kalt C/S Jonny. C/S Jonny er bygget som en 1:32 skala modell av en slepebåt. Den har to azimut thrustere og en ... -
Distributed motion sensing on ships
Heyn, Hans-Martin; Udjus, Guttorm; Skjetne, Roger (Journal article; Peer reviewed, 2017)A current trend is autonomous transport of goods and people in the air, at land, and at sea. For safe and reliable operations, autonomous systems require sensors that replace, or even exceed, the senses of a human operator. ... -
Distributed sensing of loads acting against the hull of a stationkeeping vessel in ice
Heyn, Hans-Martin; Skjetne, Roger; Scibilia, Francesco (Chapter, 2018)This paper introduces the concept of distributed motion sensing for stationkeeping vessels in ice infested waters. During the SKT 2017 project, conducted in February and March 2017 in the Bay of Bothnia, five inertial ... -
Disturbance rejection by acceleration feedforward for marine surface vessels
Kjerstad, Øivind Kåre; Skjetne, Roger (Journal article; Peer reviewed, 2016)Acceleration signals have a powerful disturbance rejection potential in rigid body motion control, as they carry a measure proportional to the resulting force. Yet, they are seldom used, since measuring, decoupling, and ... -
Disturbance rejection by acceleration feedforward: Application to dynamic positioning
Kjerstad, Øivind Kåre; Skjetne, Roger; Jenssen, Nils Albert (Journal article, 2011)This paper addresses environmental disturbance rejection in dynamic systems by means of acceleration feedforward. A feedforward structure calculates the environmental force and magnitude by comparing the filtered acceleration ...