Browsing Institutt for marin teknikk by Title
Now showing items 2063-2082 of 3430
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Modelling and dynamic analysis of a semi-submersible floating vertical axis wind turbine
(Doctoral thesis at NTNU;2015:89, Doctoral thesis, 2015)Wind turbines are mainly classified into horizontal axis wind turbines (HAWTs) and vertical axis wind turbines (VAWTs) based on different orientation of their axis of rotation. Ever-increasing demand for energy boosts ... -
Modelling and Estimation of Shallow Water Wave Loads and Load Effects on Large Volume Structures
(Master thesis, 2020) -
Modelling and geometry optimisation of wave energy converters
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:117, Doctoral thesis, 2013)The ultimate goal of wave energy undertaking is to find a solution that minimises the cost of delivered energy. Not only should a device maximise its energy absorption, but also the costs associated with absorbing and ... -
Modelling and Global Analysis of Submerged Loading System in Deep Waters
(Master thesis, 2014)Framo Engineering has replaced tanker loading unit (TLU) by a Framo submerged loading (FSL) system at Draugen, with 257m water depth, in summer 2012. In recent years a lot of activities of oil and gas companies including ... -
Modelling and phase controlof wave-energy converters
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:23, Doctoral thesis, 2010)Current prognoses are that, unless counteracted by very strong political measures, the world will meet both energy shortage and climate crisis within a horizon of a few decades, both of which are strongly related to our ... -
Modelling and response analysis for fatigue design of a semi-submersible wind turbine
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:337, Doctoral thesis, 2014)Offshore wind is seen as part of the solution for reducing the world’s dependency on nonrenewable sources with CO2 intensive production processes. Developing wind turbines that float will enable us to harness wind in deep ... -
Modelling and Robust Control of Production Force of a Wave Energy Converter
(Master thesis, 2014)Lifesaver is a point-absorber wave energy converter developed by Fred. Olsen. She is currently deployed off the coast of England for pre-commercial testing. Lifesaver consists of a toroidal floater supporting three Power-Take ... -
Modelling and simulation of a zero-emission hybrid power plant for a domestic ferry
(Peer reviewed; Journal article, 2021)This paper presents a simulation tool for marine hybrid power-plants equipped with polymer exchange membrane fuel cells and batteries. The virtual model, through the combination of operational data and dynamically modelled ... -
Modelling and Simulation of Underwater Vehicle-Manipulator System
(Master thesis, 2019)Denne masteroppgaven omhandler samspillet mellom en manipulator og en fjernstyrt undervannskjøretøy, dette systemet blir også kalt et undervanns kjøretøy-manipulator system. Norges Tekniske og Naturvitenskapelige Univeristet ... -
Modelling of a Shipboard Electric Power System for Hardware-in-the-Loop Testing
(Journal article, 2020)As the design complexity of modern maritime systems is increasing, the need for advanced and appropriate simulation technologies is higher than ever. Different subsystems such as shipboard power systems and maritime ... -
Modelling of a Solenoid Injector for Internal Combustion Engines and Simulation Using the Bond Graph Methodology
(Peer reviewed; Journal article, 2023)In internal combustion engines, fuel injection timing, injection rate and pressure is optimized to ensure suitable combustion and reduce emissions. Injectors are complex systems where mechanical, electromagnetic, and fluid ... -
Modelling of flexible slender systems for real-time simulation and control applications
(Doktoravhandlinger ved NTNU, 1503-8181; 2007:222, Doctoral thesis, 2007)The main contributions in the present thesis are the development of two mathematical models describing the motion and forces in slender mechanical systems like cables. The main advantage by the models proposed is the ... -
Modelling of Hydrodynamic Loads on Aquaculture Net Cages by a Modified Morison Model
(Chapter, 2017)A modified Morison model is presented for calculation of hydrodynamic forces on aquaculture net cages. The model is based on a simple method for conversion of \textit{"screen model force coefficients"} to approximate ... -
Modelling of Iceberg Impact Interaction with Floating Structures
(Master thesis, 2019)På grunn av økt aktivitet i de is-infiserte arktiske områdene er det ønskelig med økt innsikt i de mulige konsekvensene av støt mellom is og konstruksjon og hvordan det kan påvirke den strukturelle integriteten. Hovedmålet ... -
Modelling of Loads and Responses of a Permaskirt on a Flexible Net Cage Fish Farm
(Master thesis, 2014)As the numbers of fish farms are increasing, the problems with lice are becoming of greater importance. The lice cause diseases and death, leading to loss in profit for the fish farms as well as reduction of the wild stock. ... -
Modelling of Metocean Conditions for the Purpose of Planning Marine Operations
(Master thesis, 2015)The sea conditions of two areas, Haltenbanken and the Barents Sea, have been established in this project. Furthermore, a few cases of marine operations have been evaluated, among other topics. The fist part establishes ... -
Modelling of Ringing Loads on Offshore Wind Turbine Monopiles
(Master thesis, 2020)Ringing er et fenomen som kan true den strukturelle integriteten til offshore vindturbin-monopeler. Det er karakterisert som en plutselig transient oscillering ved bølgefrekvens høyere enn egenfrekvensen til strukturen, ... -
Modelling of Ship Superstructure Icing: Application to Ice Bridge Simulators
(Master thesis, 2012)Increasing activities on high north regions bring about a demand of safety ship navigation. Under severe weather condition considerable amounts of ice may accumulate on marine structures. Ice bridge simulator is of importance ... -
Modelling of the ductile-brittle fracture transition in steel structures with large shell elements: A numerical study
(Journal article; Peer reviewed, 2018)In this paper, the strain energy density (SED) criterion is proposed for predicting the ductile-brittle fracture transition (DBFT) in ships and offshore structures. In finite element simulations, these structures are ... -
Modelling of wind turbine gear stages for Digital Twin and real-time virtual sensing using bond graphs
(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 ...