Institutt for marin teknikk
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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 ... -
An Analysis of the Impact Forces on a Jack-up Leg During Installation on Stiff Seabed Conditions
(Master thesis, 2023)The ongoing global energy transition has led to significant growth in the offshore wind sector. This growth has resulted in a high demand for offshore installation vessels like the 'Aeolus', and the need to push up their ... -
Onsite Blade Exchange on a Tension-Leg Platform Floating Wind Turbine using a Self-Climbing Crane
(Master thesis, 2023)Floating offshore wind turbines offer a means to access wind resources in waters that are too deep for bottom-fixed offshore wind turbines. To operate a floating wind farm, it must be possible to perform maintenance on the ... -
Data-driven modeling of hydrodynamic loading using NARX and harmonic probing
(Peer reviewed; Journal article, 2023)Optimizing floating wind turbines and their mooring systems requires validated computational models that predict wave-frequency and low-frequency hydrodynamic loads. Low-frequency loads are crucial for determining extreme ...