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Dynamic domain decomposition strategy coupling lattice Boltzmann methods with Finite differences approximations of the Navier-Stokes equations to study bodies in current
(Chapter; Peer reviewed, 2015)A Domain-Decomposition (DD) strategy is proposed for problems involving regions with slow variations of the flow (A) and others where the fluid features undergo rapid changes (B), like in the case of steady current past ... -
Dynamic Efficiency Modeling of a Marine DC Hybrid Power System
(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 fault-detection in shipboard electric load sharing.
(Master thesis, 2013)The main contribution of this thesis is an investigation of dierent fault detection systems that canbe used for marine diesel electric power plants.The motivation of this thesis is to develop fault detection systems that ... -
Dynamic Load Effects and Power Performance of an Integrated Wind–Wave Energy System Utilizing an Optimum Torus Wave Energy Converter
(Peer reviewed; Journal article, 2022)To increase the utilization of wave and other renewable energy resources, an integrated system consisting of an offshore wind turbine and a wave energy converter (WEC) could be used to harvest the potential energy. In this ... -
Dynamic Load Effects on a Submerged Floating Tube Bridge with emphasis on Vortex-induced Vibrations
(Master thesis, 2017)A ferry-free highway is under planning of the Norwegian Public Roads Administration on the south-west coast of Norway. Many of the fjords are characterized as very deep and wide, resulting in a need for innovative, new ... -
Dynamic loads on marine propellers due to intermittent ventilation
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:252, Doctoral thesis, 2010)Dynamic Positioning (DP) systems are increasingly replacing traditional positionkeeping methods—such as jack-up barges and anchoring systems—on board ships operating in ever deeper waters. During these operations, the ... -
Dynamic Model Development of Wind Turbine Drivetrains by Using Sensor Measurements
(Chapter, 2021)This paper aims to analyze the feasibility of establishing a dynamic drivetrain model from condition monitoring measurements. In this study SCADA data and further sensor data is analyzed from a 1.5MW wind turbine, provided ... -
Dynamic Model Predictive Control for Load Sharing in Electric Power Plants for Ships
(Master thesis, 2012)The main contribution of this thesis is an investigation of model predictive control(MPC) for marine diesel electric power plants. Recommendations and new ideasfor further development are emphasized.The motivation of the ... -
Dynamic Modeling and Real-Time Simulation of a Ship Hybrid Power System Using a Mixed-Modeling Approach
(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 and Stability Analysis of Onboard DC Power System for Hybrid Electric Ships
(Chapter, 2019)This paper presents the dynamic modeling and stability analysis of the onboard DC power system, applicable to hybrid electric ships. The system topology is established with a special focus on the integration of the energy ... -
Dynamic modeling, simulation, and testing of a marine DC hybrid power system
(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 Modeling, Stability Analysis and Power Management of Shipboard DC Hybrid Power Systems
(Journal article; Peer reviewed, 2021)This paper proposes a framework for the stability analysis and control testing of marine hybrid power systems with DC power architecture. The dynamics of such active systems are increasingly influenced by interactive modes ... -
Dynamic Modelling and Analysis of Three Floating Wind Turbine Concepts with Vertical Axis Rotor
(Proceedings of the twenty-fifth International Ocean and Polar Engineering Conference;ISOPE 2015, Chapter, 2015)Recently there is an increasing interest in the development of offshore floating vertical axis wind turbines (FVAWTs). A FVAWT mounted on a semi-submersible has been proposed by several researchers, and a FVAWT with a spar ... -
Dynamic Modelling of Fuel Cell Systems for Electric Propulsion
(Chapter, 2021)In this paper, a dynamic model is developed for hybrid electric powertrains with fuel cell and batteries. The hybrid powertrain is considered mainly for marine propulsion with dynamic load, although the study can be ... -
Dynamic Modelling, Simulation and Visualization of Marine Crane Operations on DP Vessels
(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 ... -
Dynamic Modelling, Vibration and Fatigue Analysis of Slow Rotating Propulsion Systems
(Master thesis, 2018)In recent years, shipping has experienced a technical transformation motivated by its impact on the environment and the desire to reduce operational costs. Engines with lower power ranges and slow steaming are two examples. ... -
Dynamic Positioning in Extreme Sea States: Improving Operability Using Hybrid Design Methods
(Master thesis, 2014)This thesis investigates the performance of high-level hybrid dynamic positioning (DP) algorithms in extreme environmental conditions. A vessel in DP uses the thrusters as the sole means of keeping position in wind, waves ... -
Dynamic Positioning of Marine Vessels in Ice
(Doctoral thesis at NTNU;2016:168, Doctoral thesis, 2016)This thesis is a collection of papers focusing on various aspects of dynamic positioning of marine vessels in ice. Most emphasis is put on the dynamic broken, or managed, sea-ice environment where pioneering operations ... -
Dynamic Positioning of Surface Effect Ships using vent valve actuation
(Master thesis, 2019)For en offshore-arbeidstaker i olje- og gassindustrien er helikoptertransporten til installasjonen den aktiviteten knyttet til den høyeste risikoen. Et alternativ til personelltransport ved hjelp av helikopter er å bruke ... -
Dynamic Positioning using Deep Reinforcement Learning
(Master thesis, 2020)Classic methods for Dynamic Positioning (DP) of surface vessels often consists of first calculating desired forces and moments to exert on the vessel by using a motion controller, followed by a thrust allocation scheme for ...