Institutt for marin teknikk
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Examination of environmental lumping methods for fatigue assessment of floating wind turbines
(Master thesis, 2023)Flytende turbiner utgjør et nytt forskningsfelt innenfor havvind, en ung bransje i seg selv. Etterspørselen etter havvindturbiner vil sannsynligvis øke betydelig i de kommende tiårene. Mens bunnfaste turbiner generelt er ... -
Experimental and finite element analysis of fatigue strength for 300 mm2 copper power conductor
(Journal article; Peer reviewed, 2014)The fatigue strength of a 300 mm2 stranded copper conductor was investigated experimentally and by finite element (FE) analysis. An analytical model was also developed and validated. Wires taken from the outer layer of the ... -
Weather optimal dynamic positioning of underactuated AUVs using output feedback control
(Journal article, 2006)In this paper we present an output feedback control system for dynamic positioning of underactuated AUVs. The control objective is to maintain a desired distance to the target while orienting the vehicle towards the target ... -
Marine Operations in Arctic conditions
(Peer reviewed; Journal article, 2023)Marine operations require careful early planning and thereafter detailed planning prior to project execution. The time from initiating an operation to finalization of the activity is typically several days. The activity ... -
Observer design for underwater vehicles with position and angle measurement
(Journal article, 2006)In this paper we propose a new observer system for underwater vehicles. The main design objective behind this strategy is to reduce the destabilizing effect of the Coriolis and centripetal forces and moments in the observer. ... -
Effect of wind speed distribution and site assessment on pitch bearing loads and life
(Peer reviewed; Journal article, 2023)In this paper, the wind speed distribution at thirteen onshore and offshore wind sites has been studied. Different probability distributions are used to estimate the wind speed distribution. Several goodness-of-fit indicators ... -
Integrating Software FMEA and STPA to Develop a Bayesian Network-Based Software Risk Model for Autonomous Ships
(Peer reviewed; Journal article, 2023)The autonomous shipping industry is increasingly focusing on enhancing the safety and reliability of software-based systems. Conducting a risk assessment is a requirement for demonstrating the safety equivalence of autonomous ... -
Onboard Hyperspectral Classification Enables Georeferencing
(Journal article; Peer reviewed, 2023)The Norwegian University of Science and Technology (NTNU) has been building a system composed of multiple remote sensing agents for ocean observations. NTNU launched the first HYPerspectral Smallsat for Ocean observation ... -
Effects of wind field characteristics on pitch bearing reliability: a case study of 5 MW reference wind turbine at onshore and offshore sites
(Peer reviewed; Journal article, 2023)This paper presents a study on pitch bearing basic rating life affected by wind field characteristics at both onshore and offshore wind sites. The National Renewable Energy Laboratory 5 MW reference wind turbine is selected ... -
Numerical studies of viscous flow around straight and curved tandem cylinders
(Doctoral theses at NTNU;2024:81, Doctoral thesis, 2024)The physics of flow around straight and curved cylinders in tandem is investigated by means of direct numerical simulations (DNS), for transitional and turbulent flow regimes. For straight tandem cylinders in the reattachment ... -
Towards autonomous underwater navigation and perception for end-to-end ship hull inspection
(Doctoral theses at NTNU;2024:68, Doctoral thesis, 2024)This thesis presents an innovative and integrated solution for end-to-end underwater ship hull inspection using a small and low-cost Remotely Operated Vehicle (ROV). In a world where maritime activities have significant ... -
Structural reliability analysis of secondary hull detail
(Chapter, 2023)A reliability model for analyzing the possible occurrence of crack propagation of a secondary structural detail is developed. Vibration response due to engine excitation is formulated by a stochastic model based on analysis ... -
Reliability Analysis of Crack Growth Occurrence for a Secondary Structural Component due to Vibration Excitation
(Chapter, 2023)Ship hull vibration is a significant contributor to fatigue crack growth and the major sources of vibrations are found to be the main engine vibration excitation, the wave-induced springing and whipping loads, and the ... -
Reliability Analysis of Crack Growth Occurrence for a Secondary Hull Component due to Vibration Excitation
(Peer reviewed; Journal article, 2024)Ship hull vibration is a significant contributor to fatigue crack growth and the major sources of vibrations are found to be the main engine vibration excitation, the wave-induced springing and whipping loads, and the ... -
New Renewable Hydrothermal Liquefaction (HTL) Biofuel: A Combustion and Emissions Study in an Optical Engine
(Journal article; Peer reviewed, 2023)This study involves the investigation of municipal solid waste (MSW) based biofuel in order to demonstrate its utilization as a diesel blendstock in a compression ignition (CI) engine. The biofuel was produced from the ... -
Effect of atmospheric stability on the dynamic wake meandering model applied to two 12 MW floating wind turbines
(Peer reviewed; Journal article, 2023) -
Optimal Ship Fuel Selection under Life Cycle Uncertainty
(Journal article, 2024)Shipowners need to prepare for low-emission fuel alternatives to meet the IMO 2050 goals. This is a complex problem due to conflicting objectives and a high degree of uncertainty. To help navigate this problem, this paper ... -
Wake Effect Mitigation of Floating Offshore Wind Farms Combining Layout Optimization, Turbine Repositioning and Yaw-based Wake Redirection
(Master thesis, 2023)Floating wind turbines despite the potential to harness energy from deep offshore areas where higher average wind speeds face challenges in terms of competitiveness. One approach to raising the competitiveness of a wind ... -
Camera-Sonar Combination for Improved Underwater Localization and Mapping
(Journal article; Peer reviewed, 2023)Taking advantage of the complimentary properties of sonars and cameras can improve underwater visual odometry and point cloud generation. However, this task remains difficult as the image generation concepts are different, ... -
A Methodology for Tuning of Computational Vessel Models Utilizing Wave Measurements From X-Band Marine Radar and Wave Buoy
(Chapter, 2023)Accurate estimation of the wave field and subsequent vessel response prediction are vital for making crucial judgments on the safe and timely execution of marine operations. Decision support systems based on the Response-Based ...