Browsing NTNU Open by Author "Pedersen, Eilif"
Now showing items 21-40 of 112
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Data-Driven Efficiency Modeling and Analysis of All-Electric Ship Powertrain; A Comparison of Power System Architectures
Zadeh, Mehdi; Thorstensen, Jarle; Pedersen, Eilif (Peer reviewed; Journal article, 2021)In this paper, a data-driven dynamic efficiency model is developed for efficiency evaluation and comparison of ship electric powertrain with various system configurations and load-sharing methods. Based on the proposed ... -
Data-Driven Methodology for the Analysis of Operational Profile and the Quantification of Electrical Power Variability on Marine Vessels
Swider, Anna; Pedersen, Eilif (Journal article; Peer reviewed, 2018)Measurements from the on-board systems of marine vessels are increasingly available for data analysis and are growing in importance as the ship industry enters a phase of digitalization. The purposes of the data analysis ... -
Design Calculations for a Selective Catalytic Reduction Unit - Development of a Simulation Model and Design Algorithm for a Marine Selective Catalytic Reduction Unit for IMO Tier III Compliance
Jahn, Andreas Anthonsen (Master thesis, 2015)The global emission of nitrogen oxides (NOx) from the shipping industry was approximately 15% in the period from 2007-2012, i.e. shipping is a major source of these emissions. Since 2000, the International Maritime ... -
Design of Ejector Pump for Fish Handling Operations
Vågsholm, Benjamin Sund (Master thesis, 2021)Abstract will be available on 2024-11-01 -
Design Optimization of a Low Pressure LNG Fuel Supply System
Nguyen, Kim (Master thesis, 2015)In 2014 there were 50 liquefied natural gas (LNG) fuelled ships in operation and around 70 on order worldwide. LNG proves to emit less pollution and considering the present and future emission regulations and optimistic ... -
DESIGN, MODELING AND CONTROL OF A GENERIC CRANE FOR MARINE APPLICATIONS
Gyberg, Fredrik Andre (Master thesis, 2017)This thesis is presenting the results and processes of designing a scaled down crane model that is intended for studying of crane behavior and control systems. The design process is performed as an iteration process with ... -
Development and Verification of a Gesilinger Flexible Coupling Bond Graph Model
Vik, Bjørn Eliassen (Master thesis, 2014)There has been an increase in ship traffic in Arctic waters the later years, this challenges today's ship design. One of the challenges is the contact loads that occur, due to ice blocks encountering the ship propeller. ... -
Development of a Rotordynamic Test Rig for Slender Shafts with Large Disks
Abrahamsen, Sindre (Master thesis, 2015)The main focus of this thesis is the review and update of a rotordynamic test rig which originally was unsafe to run at high speeds. The rig was recently developed at the department of marine technology at NTNU. The ... -
Diesel Engine Response Improvements using Hybrid Turbocharging
Gravdal, Anders Gusevik (Master thesis, 2017)Turbochargers are commonly used with internal combustion engines due to improvements in power and efficiency and reduced emissions over naturally aspirated engines. A central problem of turbocharged engines poor transient ... -
Distributed Co-Simulation of Maritime Systems and Operations
Sadjina, Severin Simon; Kyllingstad, Lars Tandle; Rindarøy, Martin; Skjong, Stian; Æsøy, Vilmar; Pedersen, Eilif (Journal article, 2018)Here, we present the concept of an open virtual prototyping framework (VPF) for maritime systems and operations that enables its users to develop reusable component or subsystem models, and combine them in full-system ... -
A distributed object-oriented simulator framework for marine power plants with weak power grids
Skjong, Stian; Pedersen, Eilif (Peer reviewed; Journal article, 2022)In this work, we discuss and demonstrate how multi-engine marine power plants with weak power grids efficiently can be set up and simulated in a distributed co-simulation framework. To facilitate configuration switching ... -
Dynamic Analysis in Design and Operation of Large Floating Offshore Wind Turbine Drivetrains
Torsvik, Jone (Doctoral theses at NTNU;2020:403, Doctoral thesis, 2020)This thesis presents a versatile rotor-bearing simulation model, including elements required to model rolling-element bearings as main bearings in large floating offshore wind turbines. Furthermore, the thesis presents new ... -
Dynamic Efficiency Modeling of a Marine DC Hybrid Power System
Ghimire, Pramod; Zadeh, Mehdi; Pedersen, Eilif; Thorstensen, Jarle (Chapter, 2021)With the share of high-power electronic converters, the emerging marine DC hybrid power systems have been increasingly attractive for ship designers because of their higher operational flexibility. The system efficiency ... -
Dynamic Modeling and Real-Time Simulation of a Ship Hybrid Power System Using a Mixed-Modeling Approach
Ghimire, Pramod; Reddy, Namireddy Praveen; Zadeh, Mehdi; Pedersen, Eilif; Thorstensen, Jarle (Journal article, 2020)The electrification of a ship power-train is growing at a fast pace to improve efficiency and reduce emissions. The implementation of new technologies requires test and validation using various modeling approaches. However, ... -
Dynamic modeling, simulation, and testing of a marine DC hybrid power system
Ghimire, Pramod; Zadeh, Mehdi; Pedersen, Eilif; Thorstensen, Jarle (Peer reviewed; Journal article, 2020)The hybridization of power systems offers the low-emission and energy-efficient marine vessels. However, it increases the complexity of the power system. Design, analysis, control, and optimization of such a sophisticated ... -
Dynamic Modelling, Simulation and Visualization of Marine Crane Operations on DP Vessels
Zhang, Wenzhe (Master thesis, 2015)The research presented in this thesis is based on the idea that to find a better method of modelling, simulation and controlling the dynamic mechanical systems by using Lagrange method and bond graph approach. Based on the ... -
Dynamics of a Marine Propulsion System With a Diesel Engine and a Propeller Subject To Waves
Taskar, Bhushan; Yum, Koosup; Pedersen, Eilif; Steen, Sverre (Chapter; Peer reviewed, 2015)When travelling in waves, the efficiency of the propulsion system is in most cases reduced, due to a variety of different effects. Traditionally, the performance of propeller and engine is analyzed separately. However, ... -
Dynamics of luffing motion of a flexible knuckle boom crane actuated by hydraulic cylinders
Cibicik, Andrej; Pedersen, Eilif; Egeland, Olav (Journal article; Peer reviewed, 2020)In this paper we present a modeling procedure for a flexible knuckle boom crane, which is actuated by hydraulic cylinders and is modeled as a planar multibody system. We propose a convenient framework where both rigid body ... -
Effects of propeller load fluctuations on performance and emission of a lean-burn natural gas engine at part-load conditions
Tavakoli, Sadi; Schramm, J.; Pedersen, Eilif (Journal article; Peer reviewed, 2022) -
Energy conservation and coupling error reduction in non-iterative co-simulations
Sadjina, Severin Simon; Pedersen, Eilif (Peer reviewed; Journal article, 2019)When simulators are energetically coupled in a co-simulation, coupling errors alter the total energy of the full system. This distorts system dynamics, lowers the quality of the results, and can lead to instability. Using ...