Institutt for marin teknikk
Recent Submissions
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Genset scheduling in a redundant electric power system for an offshore vessel using mixed integer linear programming
(Journal article, 2021)This paper proposes several schemes for optimal scheduling of power producers in a shipboard power system for a typical offshore supply vessel, having a multiple number of possibly varying capacity gensets. The proposed ... -
Digital image correlation for continuous mapping of fatigue crack initiation sites on corroded surface from offshore mooring chain
(Peer reviewed; Journal article, 2021)The full-field digital image correlation (DIC) technique was used to identify crack initiation and early crack growth on irregular, corroded surfaces from offshore mooring chain. Finite element analysis was paired with the ... -
System alternatives for modular, zero-emission high-speed ferries
(SNAME International Conference on Fast Sea Transportation;, Chapter, 2021)Low emission requirements exert increasing influence upon ship design. The large variety of technological options makes selecting systems during the conceptual design phase a difficult endeavor. To compare different ... -
System Uncertainty Effects on the Wave Frequency Response of Floating Vessels Based on Polynomial Chaos Expansion
(Peer reviewed; Journal article, 2021)From a mathematical viewpoint, the frequency domain analysis of vessel motion responses due to wave actions incorporates the integration of system dynamics idealized in terms of response amplitude operators (RAOs) for 6 ... -
A probabilistic long-term framework for site-specific erosionanalysis of wind turbine blades: A case study of 31 Dutch sites
(Peer reviewed; Journal article, 2021)Rain-induced leading-edge erosion (LEE) of wind turbine blades (WTBs) is associated with high repair and maintenance costs. The effects of LEE can be triggered in less than 1 to 2 years for some wind turbine sites, whereas ... -
A Probabilistic Framework for the Fatigue Damage Assessment of Ships Navigating through Level Ice Fields
(Journal article, 2021)For ships navigating in ice-covered waters, fatigue damage due to ice loads is an important issue. The purpose of this paper is to provide ship researchers and engineers with a simulation-based procedure for a probabilistic ... -
Offshore wind turbine operations and maintenance: A state-of-the-art review
(Peer reviewed; Journal article, 2021)Operations and maintenance of offshore wind turbines (OWT) play an important role in the development of offshore wind farms. Compared with operations, maintenance is a critical element in the levelized cost of energy, given ... -
Global Asymptotic Tracking for Marine Surface Vehicles using Hybrid Feedback in the Presence of Parametric Uncertainties
(Chapter, 2021)In this paper, we propose a hybrid adaptive feedback control law for global asymptotic tracking control for marine surface vehicles in the presence of parametric uncertainties. The hybrid feedback is derived from a family ... -
Risk-based decision-making support model for offshore dynamic positioning operations
(Journal article; Peer reviewed, 2021)A Dynamic Positioning (DP) system enables vessels and rigs to accurately maintain a predetermined position and heading or track. It enables precise operations under harsh environmental conditions. DP is used for a variety ... -
Experimental field study of floater motion effects on a main bearing in a full-scale spar floating wind turbine
(Peer reviewed; Journal article, 2021)In this paper we present a full-scale experimental field study of the effects of floater motion on a main bearing in a 6 MW turbine on a spar-type floating substructure. Floating wind turbines are necessary to access the ... -
Online condition monitoring of floating wind turbines drivetrain by means of digital twin
(Journal article; Peer reviewed, 2021)This paper presents a digital twin (DT) condition monitoring approach for drivetrains on floating offshore wind turbines. Digital twin in this context consists of torsional dynamic model, online measurements and fatigue ... -
Experimental study on the effect of second order wavemaker theory on the response of a flexible large diameter monopile in irregular sea
(Peer reviewed; Journal article, 2021)Motivated by the need for larger offshore wind turbines, large diameter monopile foundations are being developed. To ensure safe design, there is a need for model testing and validation of hydrodynamic load models. Scaled ... -
Uncertainty of Machine Learning-Based Methods for Wave Forecast and its Effect on Installation of Offshore Wind Turbines
(Doctoral theses at NTNU;2021:325, Doctoral thesis, 2021)Marine operations, such as offshore lifting and mating, are complex and highly weather-sensitive. When planning these weather-restricted opera-tions, it is necessary to determine the response-based operational limits in ... -
Time scale for scour beneath pipelines due to long-crested and short-crested nonlinear random waves plus current
(Journal article; Peer reviewed, 2021)This article derives the time scale of pipeline scour caused by 2D (long-crested) and 3D (short-crested) nonlinear irregular waves and current for wave-dominant flow. The motivation is to provide a simple engineering tool ... -
Risk-informed control systems for improved operational performance and decision-making
(Peer reviewed; Journal article, 2021)Autonomous systems, including airborne, land-based, marine, and underwater vehicles, are increasingly present in the world. One important aspect of autonomy is the capability to process information and to make independent ... -
Guidance and maneuvering principles for autonomous ROV missions in an aquaculture context
(Master thesis, 2021)Bidraget fra denne masteroppgaven er et nytt guidningssystem for navigering av fjernstyrte kjøretøy (ROVer) basert på en konstant referansemodell kombinert med veipunktfølging. Dette bidraget er et resultat av ønsket om å ... -
Analysing the effect of hull vibration due to main engine and propeller excitation on fatigue crack growth of pipe stack support using FEA
(Master thesis, 2021)Vibrasjons problemer i skip er et like aktuelt tema i dag som tidligere. Vibrasjoner kan forårsake lokal skade og kan lede til utmattings sprekkvekst, spesielt for sveiste komponenter. De vanligste vibrasjons kildene er ... -
The ISSC 2022 committee III.1-Ultimate strength benchmark study on the ultimate limit state analysis of a stiffened plate structure subjected to uniaxial compressive loads
(Peer reviewed; Journal article, 2021)This paper presents a benchmark study on the ultimate limit state analysis of a stiffened plate structure subjected to uniaxial compressive loads, initiated and coordinated by the ISSC 2022 technical committee III.1-Ultimate ... -
Condition monitoring and fault detection for marine battery energy storage systems
(Master thesis, 2021)Battery energy storage system (BESS) is widely applied in hybrid-electric and all-electric power and propulsion solutions to reduce fuel consumption and emissions in ships. To achieve optimal performance, it is necessary ... -
A Multi-Layer Framework for Reliability Assessment of Shore-to-Ship Fast Charging System Design
(Peer reviewed; Journal article, 2021)In this paper, a multi-layer framework is proposed to assess the reliability of Shore-to-Ship Charging (S2SC) systems, considering the potential for failures of the main elements, such as power converters and batteries. ...
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