Blar i NTNU Open på forfatter "Pedersen, Eilif"
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Engine Controller Design and Implementation for a 255 kW Diesel Engine
Land, Ketil (Master thesis, 2016)A Hybrid Power Lab is established at the Marine Technology Centre by MARINTEK, ABB and NTNU. This is a DC-grid system where variable speed generators are essential to reduce fuel consumption and emissions. The traditional ... -
Evaluation of Environmental Effects of Propulsionsystems for a PSV
Amundsen, Brage Carstens (Master thesis, 2013)An increased focus on the environment in the offshore industry has required several new restrictions relating to the emission of greenhouse gases (GHG), and most agrees that additional measures must be implemented to ensure ... -
Experimental field study of floater motion effects on a main bearing in a full-scale spar floating wind turbine
Torsvik, Jone; Nejad, Amir R.; Pedersen, Eilif (Peer reviewed; Journal article, 2021)In this paper we present a full-scale experimental field study of the effects of floater motion on a main bearing in a 6 MW turbine on a spar-type floating substructure. Floating wind turbines are necessary to access the ... -
Experimental Investigation of Injection and Combustion Processes in Marine Gas Engines Using Constant Volume Rig
Krivopolianskii, Vladimir (Doctoral theses at NTNU;2019:96, Doctoral thesis, 2019)In circumstances of the strong demand for a reduction of harmful emissions from ships, one of the main pathways of the development of marine power plants is improvement of the existing and development of new gas engine ... -
Fuel consumption and emission reduction of marine lean-burn gas engine employing a hybrid propulsion concept
Tavakoli, Sadi; Maleki Bagherabadi, Kamyar; Schramm, Jesper; Pedersen, Eilif (Peer reviewed; Journal article, 2021)As the emission legislation becomes further constraining, all manufacturers started to fulfill the future regulations about the prime movers in the market. Lean-burn gas engines operating under marine applications are also ... -
Halvt nedsenkbar tørrtre plattform: Koblingen mellom det hydro-pneumatiske stigerørsstrekk-systemet, stigerørene og kjølen.
Falk, Marianne-Isabelle; Skorpen, Thomas (Master thesis, 2012)Det hydro-pneumatiske strekksystemet til stigerørene virker som en passiv hivkompensator med en olje/gass-akkumulator for a utligne de relative bevegelsene mellom semien og stigerørene. Semiresponsen fører direkte til at ... -
High-Pressure Direct-Injection Dual Fuel Engine: Evaluation for performance and emission potential by injector modeling and simulation
Beck, Laura (Master thesis, 2020)Natural gas is a promising alternative fuel for marine engines that must comply with strict international emissions regulations. The current standard for these engines is the low-pressure dual fuel arrangement usually ... -
Hybrid modeling of strategic loading of a marine hybrid power plant with experimental validation
Rejani Miyazaki, Michel; Sørensen, Asgeir Johan; Lefebvre, Nicolas; Yum, Koosup; Pedersen, Eilif (Journal article; Peer reviewed, 2016)Recent developments in marine power systems, energy storage devices (ESDs) technology, and modification to rules and regulations increase the opportunities to improve efficiency and reduce emissions. One particular application ... -
Hybrid power plant concepts for marine vessels
Wang, Chunsheng (Master thesis, 2017)As the requirements of energy supply for ships and marine vessels are becoming more rigorous and complex, new power supply methods are in highly interests in recent years. Flywheels used for energy storage have been used ... -
Ice Load Impact on the Power Train of Azimuth Propulsion Systems
Krossholm, Andreas Kleven (Master thesis, 2014)This thesis seeks to investigate the advantages of using multibody simulation to develop proper models for power train analyses of azimuth propulsion systems. Azimuth thrusters are commonly installed on ice classed offshore ... -
Impact of simulation model fidelity and simulation method on ship operational performance evaluation in sea passage scenarios
Nielsen, Jørgen Bremnes; Sandvik, Endre; Pedersen, Eilif; Asbjørnslett, Bjørn Egil; Fagerholt, Kjetil (Journal article; Peer reviewed, 2019)In this paper, we present and investigate important factors that influence a vessels fuel consumption during operation and what model fidelity that is required to adequately capture these factors in fuel consumption ... -
The importance of the engine-propeller model accuracy on the performance prediction of a marine propulsion system in the presence of waves
seattone, simone; Tavakoli, Sadi; Taskar, Bhushan; Vincent Jensen, Michael; Pedersen, Eilif; Schramm, Jesper; Steen, Sverre; Andersen, Poul (Peer reviewed; Journal article, 2020)The shipping industry is the heart of international trading activities and the global economy. Maritime transport contributes to environmental pollution through the emission of greenhouse gases. New mandatory regulations ... -
Improvement of Thermodynamic Properties in Combustion Research Facility with Symmetrical Ignition Sources
Jaer, Peter Sommerseth (Master thesis, 2016)The Constant Volume Combustion Chamber (CVCC) at the Combustion Laboratory at the Institute of Marine Technology has shown: (I) Temperature related issues that reduce reproducibility within test series. (II) The environment ... -
Improving pre-turbine SCR systems in marine two stroke diesel engines using hybrid turbocharging: a numerical study of SCR operation range and system fuel efficiency
Nielsen, Jørgen Bremnes; Yum, Kevin Koosup; Pedersen, Eilif (Journal article; Peer reviewed, 2019)In this article, a performance evaluation of a novel system solution combining a hybrid turbocharger and a pre-turbine selective catalytic NOx reduction system is carried out. Pre-turbine selective catalytic system are ... -
Influence of Loss of Synchronisation Between Signals from Various Marine Systems on Robustness of Predictive Models Algorithms
Swider, Anna; Pedersen, Eilif (Chapter, 2017) -
Influence of Turbocharger Inertia and Air Throttle on Marine Gas Engine Response
Tavakoli, Sadi; Schramm, Jesper; Pedersen, Eilif (Journal article, 2021)Due to the current emission legislation, improving the marine propulsion system performance has received considerable notice. Employing natural gas as the primary energy source presented remarkable attention in the lean-burn ... -
Investigation of drivetrain losses of a DP vessel
Bø, Torstein Ingebrigtsen; Swider, Anna; Pedersen, Eilif (Chapter; Peer reviewed, 2017)Traditionally the efficiency of the drivetrain of a marine vessel is evaluated at rated power and speed. However, the thrust and power consumption of the thrusters are low during DP operation. In this study, the loss energy ... -
investigation of hybrid power plant configurations for an offshore vessel with co-simulation approach
Malekibagherabadi, Kamyar; Skjong, Stian; Bruinsma, Jogchum; Pedersen, Eilif (Peer reviewed; Journal article, 2023)This work presents a full-system simulator consisting of a generic power system integrated with a vessel model and real-time capabilities. The whole system simulation facilitates evaluating the overall system performance ... -
Lubrication Oil Flow Simulation in Connecting Rod
Alendal, Ivar Audun Lothe (Master thesis, 2015)Lubrication oil-flow in the crank system of an medium size diesel engine running at 750 RPM was modeled and analyzed. The model was built up by combining models from several studies in both engine lubrication systems and ... -
Main bearings in large offshore wind turbines: development trends, design and analysis requirements
Torsvik, Jone; Nejad, Amir Rasekhi; Pedersen, Eilif (Journal article; Peer reviewed, 2018)This paper discusses analysis requirements for design and operation of main bearings in modern multi-megawatt offshore wind turbines, motivated by the industry's search for reliable and cost effective main bearing solutions ...