Browsing Institutt for marin teknikk by Title
Now showing items 2611-2630 of 3421
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A Rayleigh-Ritz solution for high order natural frequencies and eigenmodes of monopile supported offshore wind turbines considering tapered towers and soil pile interactions
(Peer reviewed; Journal article, 2023)Offshore wind turbines may be exposed to extreme or accidental loads during the service life, such as extreme water slamming, ship collisions, earthquakes, extreme winds, ice loads, etc. Under the action of such loads, ... -
An RCM approach for assessing reliability challenges and maintenance needs of unmanned cargo ships
(Peer reviewed; Journal article, 2021)Unmanned autonomous cargo ships may change the maritime industry, but there are issues regarding reliability and maintenance of machinery equipment that are yet to be solved. This article examines the applicability of the ... -
Reactive path-planning for autonomous harbor maneuvering
(Master thesis, 2020)Denne avhandlingen har foreslått to guidemetoder for et autonomt skip som manøvrerer i en havn og satt sammen dette guidesystemet med et navigasjons- og kontrollsystem. Det komplette systemet ble satt sammen med det formål ... -
Real time prediction of operational safety limits for dynamic positioning of an FPSO in a Deepwater Artificial Seabed system
(Peer reviewed; Journal article, 2021)Aiming to overcome the limitations of conventional offshore field development concepts (dry tree or subsea tree) for petroleum production in ultra-deep water, a new alternative offshore field development solution, termed ... -
Real-time compensation of residual loads in dynamic positioning control systems
(Master thesis, 2023)Denne masteroppgaven fokuserer på å håndtere utfordringene forbundet med kompensasjon av annenordens, lavfrekvente bølgebelastninger på DP-fartøy. Konvensjonelt brukes integralvirkning i en tilbakekoblingssløyfe for å ... -
Real-time compensation of residual loads in dynamic positioning control systems
(Master thesis, 2023)Denne masteroppgaven fokuserer på å håndtere utfordringene forbundet med kompensasjon av annenordens, lavfrekvente bølgebelastninger på DP-fartøy. Konvensjonelt brukes integralvirkning i en tilbakekoblingssløyfe for å ... -
Real-time deterministic prediction of wave-induced ship responses based on short-time measurements
(Peer reviewed; Journal article, 2021)This paper studies real-time deterministic prediction of wave-induced ship motions using the autocorrelation functions (ACFs) from short-time measurements, namely the instantaneous ACFs. The Prolate Spheroidal Wave Functions ... -
Real-Time Hybrid Model Testing - Force-actuation and implementation
(Master thesis, 2017)To be able to understand the behaviour of complex mechanical systems, physical testing has been - and still is - of importance. Sophisticated models and numerical tools have been developed to analyze the dynamics of such ... -
Real-time hybrid model testing of a braceless semi-submersible wind turbine. Part I: The hybrid approach
(Chapter; Peer reviewed, 2016)This article presents a method for performing Real-Time Hybrid Model testing (ReaTHM testing) of a floating wind turbine (FWT). The advantage of this method compared to the physical modelling of the wind in an ocean basin, ... -
Real-time hybrid model testing of a braceless semi-submersible wind turbine. Part II: Experimental results
(Chapter; Peer reviewed, 2016)Real-Time Hybrid Model (ReaTHM) tests of a braceless semi-submersible wind turbine were carried out at MARINTEK’s Ocean Basin in 2015. The tests sought to evaluate the performance of the floating wind turbine (FWT) structure ... -
Real-time hybrid model testing of a semi-submersible 10mw floating wind turbine and advances in the test method
(Chapter, 2018)This article presents the Real-Time Hybrid Model (ReaTHM®) tests that were performed on a 10-MW semi-submersible floating wind turbine in the Ocean Basin at SINTEF Ocean in March 2018. The ReaTHM test method was used for ... -
Real-Time Hybrid Model Testing of Floating Wind Turbines
(Doctoral theses at NTNU;2016:369, Doctoral thesis, 2016)Offshore wind power is an active research topic motivated by today’s world energy crisis. While bottom-fixed turbines are relatively mature and commercially viable (though dependent on state-based subsidies to green energy), ... -
Real-time hybrid model testing of floating wind turbines: sensitivity to limited actuation
(Journal article; Peer reviewed, 2015)Real-time hybrid model testing (ReaTHM) is a new approach for conducting small-scale experimental campaign [1], [2] and [3]. In the case of a floating wind turbine in a wave basin, the aerodynamic loads on the wind turbine ... -
Real-Time Hybrid Model Testing of Moored Floating Structures Using Nonlinear Finite Element Simulations
(Chapter, 2017)The paper proposes an application of real-time hybrid model testing (abbreviated ReaTHM testing) for the study of moored offshore structures. The structure under study is a moored axisymmetric floater with various bilge ... -
Real-Time Marine Vessel and Power Plant Simulation
(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, ... -
Real-Time Parameter Estimation of a Nonlinear Vessel Steering Model Using a Support Vector Machine
(Journal article; Peer reviewed, 2019)The least-square support vector machine (LS-SVM) is used to estimate the dynamic parameters of a nonlinear marine vessel steering model in real-time. First, maneuvering tests are carried out based on a scaled free-running ... -
Real-Time Parameter Estimation of Nonlinear Vessel Steering Model Using Support Vector Machine
(Chapter, 2018)The Least-square support vector machine (LS-SVM) is used to estimate the dynamic parameters of a nonlinear marine vessel steering model in real-time. First, manoeuvring tests are carried out based on a scaled free-running ... -
Real-Time Simulation of Ship Waves
(Master thesis, 2022)Denne oppgåva har som mål å utvikle ei rutine for realistisk og effektiv visuell modellering av skipsbølgjer i sanntid. Formålet er å forbetre dei virtuelle miljøa der algoritmar som skal brukast i autonome fartøy enklare, ... -
Recent Advances in Integrated Response Analsysis of Floating Wind Turbines in a Reliability Perspective
(Peer reviewed; Journal article, 2020)Offshore wind provides an important source of renewable energy. While wind turbines fixed to the seabed in shallow water have already been industrialized, floating wind turbines are still at an early stage of development. ... -
Recent Developments and New Results on The Flow Around an Inclined 6:1 Prolate Spheroid
(Chapter, 2017)In the light of new computational resources and improved simulation tools we present new simulations of the flow around an inclined 6:1 prolate spheroid. We present the development of the flow from the symmetric and laminar ...