Blar i Institutt for marin teknikk på tittel
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Rational calculation of sea margin
(Master thesis, 2017)The sea margin is an important parameter when designing a ship. The sea margin describes how much added power is required in operational conditions compared to the calm water conditions in order to maintain a speed in ... -
A rational model for maneuvering in irregular waves with the effect of waves on the propeller and rudder inflow taken into account
(Peer reviewed; Journal article, 2022)A modular model for maneuvering in regular and irregular waves is presented. A new model is presented for the y-component of the rudder inflow. Moreover, an efficient time-domain method for estimation of slowly varying ... -
Rational Upscaling and Modelling of a Semi-Submersible Floating Offshore Wind Turbine
(Master thesis, 2016)Floating offshore wind turbines are taking on more and more prominence, as the industry moves towards larger turbines, farther offshore, in deeper water. The increase in turbine size can reduce the costs of offshore wind ... -
Rational upscaling of a semi-submersible floating platform supporting a wind turbine
(Journal article; Peer reviewed, 2016)This work examines the procedure of upscaling of a semi-submersible platform in order to support a predefined wind turbine. As a result of technological progress and design changes, basic scaling based on the turbine rating ... -
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 ...