Blar i Institutt for marin teknikk på forfatter "Pedersen, Eilif"
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Modelling of wind turbine gear stages for Digital Twin and real-time virtual sensing using bond graphs
Mehlan, Felix Christian; Pedersen, Eilif; Nejad, Amir R. (Peer reviewed; Journal article, 2022)In this paper a wind turbine high-speed gear stage model is developed for the purpose of real-time virtual sensing of gear and bearing loads in a Digital Twin framework. The model requirements are: accurate representation ... -
Models and Methods for Efficiency Estimation of a Marine Electric Power Grid
Bø, Torstein Ingebrigtsen; Pedersen, Eilif (Chapter; Peer reviewed, 2017)Diesel electric propulsion has become industry standard for many marine applications. Typically, a significant part of the operations of vessels with diesel electric propulsion is done with low loads on the motors and ... -
Non-angular MPC-based Thrust Allocation Algorithm for Marine Vessels - A Study of Optimal Thruster Commands
Skjong, Stian; Pedersen, Eilif (Journal article, 2017)In this paper, a thrust allocation algorithm for marine vessels based on model predictive control (MPC) theory and a nonangular vector formulation is presented and studied. The main objective in this paper is to highlight ... -
Numerical Simulation of Twin Nozzle Injectors
Milak, Dino (Master thesis, 2015)Fuel injectors for marine applications have traditionally utilized nozzles with symmetric equispaced orifice configuration. But in light of the new marine emission legislations the twin nozzle concept has arisen. The twin ... -
On the modelling of heat exchangers and heat exchanger network dynamics using bond graphs
Nielsen, Jørgen Bremnes; Pedersen, Eilif (Journal article; Peer reviewed, 2018)Heat exchanger networks are important systems in most thermal engineering systems and are found in applications ranging from power plants and the process industry to domestic heating. Achieving cost-effective design of ... -
On the numerical stability in dynamical distributed simulations
Skjong, Stian; Pedersen, Eilif (Journal article; Peer reviewed, 2019)This work takes aim at studying numerical stability in distributed simulations through dynamic stabilityand stability criteria for explicit solvers. This is done by studying outer stability limits, for example stabilityconditions ... -
Operational sea passage scenario generation for virtual testing of ships using an optimization for simulation approach
Sandvik, Endre; Nielsen, Jørgen Bremnes; Asbjørnslett, Bjørn Egil; Pedersen, Eilif; Fagerholt, Kjetil (Peer reviewed; Journal article, 2020)In this paper, a model for implementation of sea passage operational scenarios in the context of simulation-based design of ships is presented. To facilitate the transition towards more energy-efficient shipping, the ability ... -
A physics-, SCADA-based remaining useful life calculation approach for wind turbine drivetrains
van Binsbergen, Diederik; soares, marcelo nesci; Pedersen, Eilif; Nejad, Amir R. (Peer reviewed; Journal article, 2022)This paper describes the development of a physics-, SCADA-based model able to predict the expected lifetime for wind turbine drivetrains. A real-time coupled torsional gearbox-generator model is developed using the bond ... -
Real-Time Marine Vessel and Power Plant Simulation
Bø, Torstein Ingebrigtsen; Johansen, Tor Arne; Dahl, Andreas Reason; Rejani Miyazaki, Michel; Pedersen, Eilif; Rokseth, Børge; Skjetne, Roger; Sørensen, Asgeir Johan; Thorat, Laxminarayan; Utne, Ingrid Bouwer; Yum, Koosup; Mathiesen, Eirik (Chapter; Peer reviewed, 2015)In this paper, we present a system simulator of a marine vessel and power plant which contains the mechanical system with diesel engines, propellers, steering gear, and thrusters; the electrical system with generators, ... -
REGENERATION IN CRANE OPERATIONS
Øksnes, Jan Olav (Master thesis, 2017)In this thesis a marine power plant with a battery pack has been modeled using bond graph theory, using the bond graph simulation software 20-sim. The popularity of hybrid power systems are increasing in the marine sector, ... -
Rigid body modeling and motion control of offshore cranes performing heavy lift operations
Holguin, Nicolas Fredhall (Master thesis, 2019)Denne avhandlingen er en fortsettelse av arbeidet utført i Gyberg (2017) relatert til modellering av offshore-kraner, og har som formål å videreutvikle kransimuleringsmodellen. Derfor presenteres en omfattende beskrivelse ... -
Safety and Verification of Advanced Maritime Vessels - An Approach Based on Systems Theory
Rokseth, Børge (Doctoral theses at NTNU;2018:119, Doctoral thesis, 2018)The past few decades have seen rapid technological development in ships and offshore vessels. Advanced electrical power plants and dynamic positioning (DP) systems are now widespread, and the growing demand for greener and ... -
Sea Passage Scenario Simulation for Ship System Performance Evaluation
Sandvik, Endre (Doctoral theses at NTNU;2019:265, Doctoral thesis, 2019)This thesis addresses evaluation of ship system operational performance exposed to ocean waves for providing enhanced evaluation capabilities in the transition towards environmentally friendly shipping. It proposes and ... -
Ship Propulsion Dynamics and Emissions Gas Engine Methane Slip Reduction at Dynamic Loads
Tavakoli, Sadi (Doctoral theses at NTNU;2021:261, Doctoral thesis, 2021)Continuous discharging of greenhouse gases into the atmosphere has motivated researchers to develop prime movers for working with less polluted energy sources. The low cost of natural gas relative to diesel and gasoline ... -
Simulation of a two-stroke diesel engine for propulsion in waves
Yum, Koosup; Taskar, Bhushan; Pedersen, Eilif; Steen, Sverre (Journal article; Peer reviewed, 2016)Propulsion in waves is a complex physical process that involves interactions between a hull, a propeller, a shaft and a prime mover which is often a diesel engine. Among the relevant components, the diesel engine plays an ... -
Simulation-Based Ship Hybrid Power System Concept Studies and Performance Analyses
Ghimire, Pramod (Doctoral theses at NTNU;2022:166, Doctoral thesis, 2022)The stricter regulations for emissions reduction and energy efficiency improvement are driving the maritime industries towards implementing greener and more energy-efficient solutions, one of which is a battery-based hybrid ... -
Simulator Approach to Concept Analysis and Optimization of Marine Power Plants
Maleki Bagherabadi, Kamyar (Doctoral theses at NTNU;2023:236, Doctoral thesis, 2023)The strict environmental regulations for the marine sector directed the research studies and industries to develop solutions in compliance with new goals of promoting efficiency and decreasing emissions. Among the solutions, ... -
Soot Investigation on Fish Oil Spray Combustion in a Constant Volume Cell
Malin, Maximilian Christoph; Krivopolianskii, Vladimir; Rygh, Bjørn; Æsøy, Vilmar; Pedersen, Eilif (Journal article; Peer reviewed, 2015)Maritime environmental regulations stipulate lower emissions from the shipping industry. To cope with these rules, improving the combustion processes, make use of cleaner alternative fuels and implement exhaust gas cleaning ... -
Strategies on Methane Slip Mitigation of Spark-Ignition Natural Gas Engine during Transient Motion
Tavakoli, Sadi; Schramm, Jesper; Pedersen, Eilif (Peer reviewed; Journal article, 2021)The liquefied natural gas (LNG)-fueled ships were provisioned to meet the strict emission legislation in the marine application since 2000. However, the scientific approach of burning the low-emission natural gas in lean ... -
System-level modeling of marine power plant with PEMFC system and battery
Malekibagherabadi, Kamyar; Skjong, Stian; Bruinsma, Jogchum; Pedersen, Eilif (Journal article; Peer reviewed, 2022)