Blar i Institutt for marin teknikk på tittel
Viser treff 2721-2740 av 3579
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R/V Gunnerus Digital Twin Infrastructure
(Master thesis, 2020)Denne rapporten undersøker potensialet for bruk av digitale tvillinger i utdannings-øyemed for ingeniørstudenter gjennom NTNUs forskningsfartøy FF Gunnerus. Samtidig som digitale tvillinger blir mer og mer relevant for å ... -
Random wave-driven drag forces on near-bed vegetation in shallow water based on deepwater wind conditions
(Journal article; Peer reviewed, 2019)This article provides a simple analytical method for giving estimates of random wave-driven drag forces on near-bed vegetation in shallow water from deepwater wind conditions. Results are exemplified using a Pierson–Moskowitz ... -
Random wave-driven seabed shear stress estimation in shallow water based on long-term variation of deep water wave conditions
(Journal article; Peer reviewed, 2017)This article presents a simple analytical method giving estimates of wave-driven bottom stresses for very rough and mud seabeds in shallow water from long-term wave statistics in deep water. The results are exemplified ... -
Random Wave-Induced Burial and Scour of Short Cylinders and Truncated Cones on Mild Slopes
(Chapter; Peer reviewed, 2017)A stochastic approach calculating the random wave-induced burial and scour depth of short cylinders and truncated cones on mild slopes is provided. It assumes the waves to be a stationary narrow-band random process and a ... -
Random wave-induced current in shallow water using deep-water wind and wave statistics
(Peer reviewed; Journal article, 2020)This paper addresses the random wave-induced current in shallow water based on deep-water wind and wave statistics, where the wave-induced current is expressed in terms of the deep-water seastate wave parameters, significant ... -
Rao-Blackwellized Particle Filter with Grid-Mapping for AUV SLAM Using Forward-Looking Sonar
(Chapter, 2018)This paper adresses underwater localization for an AUV using SLAM and Forward Looking Sonar (FLS) data. The proposed method is Rao-Blackwellized Particle Filter (RBPF) with grid mapping. The original RBPF uses multiple ... -
A rate and pressure dependent elastoplastic material model for glacial ice colliding with marine structures
(Chapter, 2023)An elastoplastic ice material model with a rate and pressure dependent yield criterion is proposed in the present study for ice-structure collision simulations. The yield criterion is based upon the Tsai-Wu failure envelope ... -
Rational analysis of Nordlaks' "Havfarm" aquastructure concept for exposed waters
(Master thesis, 2017)A global analysis of Nordlaks Havfarm concept has been conducted. In order to do so three equivalent design waves targeting the ultimate limit state response of the vertical bending, horizontal bending and torsional moment ... -
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 ...