Browsing NTNU Open by Author "Pedersen, Eilif"
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A Bond Graph Approach for Modelling Systems of Rigid Bodies in Spatial Motion
Rokseth, Børge (Master thesis, 2014)The research presented in this thesis seeks to improve the current state and technique for dynamic modelling of systems of rigid bodies in spatial motion. The research have been focused around modelling of underwater ... -
A Method for Determining the Mode Shapes from a Finite Element Model for Use in a Finite-Mode Vibration Simulation Model
Alm, Thomas Gløersen (Master thesis, 2016)In this thesis, a methodology for retrieving mathematical expressions of the mode shapes of a crankshaft based on numerical data yielded by a finite element model is presented and tested. The mode functions should be used ... -
A real-time simulator framework for marine power plants with weak power grids
Skjong, Stian; Pedersen, Eilif (Journal article, 2017)This work takes aim at presenting a generic real-time simulation framework for marine power plants with weak power grids, containing transient functionalities such as starting and stopping of arbitrary generators, and phase ... -
A system approach to selective catalytic reduction deNOx monolithic reactor modelling using bond graphs
Nielsen, Jørgen Bremnes; Pedersen, Eilif (Journal article; Peer reviewed, 2018)Stricter NOx emission limits for marine diesel engines have resulted in a market demand for engine external NOx reduction solutions. This demand has led to the development of ammonia-based selective catalytic reduction ... -
Active Magnetic Radial Bearings Applied To Rotor Dynamics
Simonsen, Eirik (Master thesis, 2014)This thesis considers the development of a mathematical expression for actively controlled magnetic bearings and their influence on a flexible shaft with two disks supported by two bearings. Active magnetic bearings are a ... -
An Experimental Study on the Application of Fish Oil as Fuel
Rygh, Bjørn Mikkel (Master thesis, 2015)Two fish based bio oils in blends with MGO (Marine Gas Oil) have been tested in a constant volume combustion chamber (CVCC). The CVCC has optical access and a high-speed camera has captured images of the spray formation. ... -
Analysis of the Boil-Off Phenomenon in Relation to Ambient Conditions
Paulsen, Erling Singstad (Master thesis, 2017)The relationship between ambient conditions and the boil-off of liquefied natural gas during marine transportation has been investigated using a data-driven approach. The data consisted of sensory data collected from a ... -
Application of data-driven models in the analysis of marine power systems
Swider, Anna; Langseth, Helge; Pedersen, Eilif (Peer reviewed; Journal article, 2019)Computational thinking and coding are becoming an integral part of K-12 education, with female students being underrepresented in such subjects. The proliferation of technological tools and programming environments offers ... -
Autonomous Loading Operations with a Shipboard Knuckle-boom Crane
Hammarstrøm, Henrik (Master thesis, 2024)Dagens lasteoperasjoner er i stor grad en manuell prosess som utgjør en helserisiko for involvert mannskap. Med å øke graden av automasjon i hvert av systemene involvert i en lasteoperasjon, kan operasjonen optimaliseres ... -
Batteries for marine applications
Troncoso Abelleira, Maria Teresa (Master thesis, 2013)The significant reduction in environmental emissions stated by the new IMO legislation, which specifies an amount of sulphur in fuels below 5% for 2020 and a NOx limit with an 80% reduction respect to the actual IMO limit ... -
Co-Simulation of a Marine Hybrid Power System for Real-Time Virtual Testing
Ghimire, Pramod; Zadeh, Mehdi; Pedersen, Eilif (Chapter, 2021)Co-simulation enhances the efficient simulation development even for complex systems reducing time to market and computational effort. This work aims to develop a marine hybrid power system simulator using a co-simulation ... -
Co-Simulation of a Marine Offshore Vessel in DP-Operations Including Hardware-In-the-Loop (HIL)
Skjong, Stian; Pedersen, Eilif (Chapter; Peer reviewed, 2017)In this work, a co-simulation case study of a marine offshore surface vessel in Dynamic Positioning (DP) operation, where the DP-controller is placed on an Arduino® micro-controller, is presented. The reasons for using ... -
Co-simulation of the propulsion system onboard the icebreaker Oden.
Odéen, Terese (Master thesis, 2020) -
Comparison of Delayless Digital Filtering Algorithms and Their Application to Multi-Sensor Signal Processing
Swider, Anna; Pedersen, Eilif (Journal article; Peer reviewed, 2018)In the phase of industry digitalization, data are collected from many sensors and signal processing techniques play a crucial role. Data preprocessing is a fundamental step in the analysis of measurements, and a first step ... -
Complementarity of Data-Driven and Simulation Modeling Based on the Power Plant Model of the Offshore Vessel
Swider, Anna; Skjong, Stian; Pedersen, Eilif (Chapter; Peer reviewed, 2017)Nowadays, there are more ships equipped with on-board monitoring systems and vessels with many sensors are becoming a standard. Available measurements can be employed for system optimization which play an important role ... -
Component-Based Modeling and Simulation of Nonlinear Drill-String Dynamics
Tengesdal, Njål Kjærnes; Holden, Christian; Pedersen, Eilif (Chapter, 2019)In this paper, we present a dynamic model for a generic drill-string. The model is developed with the intention for component-based simulation with coupling to external subsystems. The performance of the drill-string is ... -
Computational Fluid Dynamics Simulations of Nonlinear Sloshing in a Rotating Rectangular Tank Using the Level Set Method
Grotle, Erlend Liavåg; Bihs, Hans; Æsøy, Vilmar; Pedersen, Eilif (Journal article; Peer reviewed, 2018)In this paper, numerical simulations of nonlinear sloshing in rectangular tanks are presented. Model implementations in the open source software reef3d are tested, and the results are compared with experimental data from ... -
Crane Rig: An Experimental Setup for Developing and Verifying New Control Methods for Marine Crane Operations
Evang, Thomas; Skjong, Stian; Pedersen, Eilif (Chapter; Peer reviewed, 2017)This paper will present the derivation of dynamic equations describing the motion of a knuckleboom crane for marine vessels. The dynamics will be derived using Lagrange’s equation, the theory of virtual work and generalized ... -
Data mining methods for the analysis of power systems of vessels
Swider, Anna (Doctoral theses at NTNU;2018:412, Doctoral thesis, 2018)Measurements from on-board monitoring systems of vessels are now increasingly available for data analysis, and their relevance is growing as the ship industry enters the digitilization phase. The analysis of data from ... -
Data-Driven Analysis of Vessel Performance
Jonge, Christian de (Master thesis, 2017)In this thesis the relation between vessel performance and various vessel and environmental variables were investigated using a data-driven approach. A total of 12 variables such as speed over ground and days since drydock ...