Institutt for marin teknikk
Recent Submissions
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Assessment of risk tolerance for future autonomous offshore installations
(Peer reviewed; Journal article, 2021)The future normally unmanned production concepts for offshore petroleum installations in the North Sea and associated waters are briefly outlined. A case study is summarised for a fictitious normally unmanned facility, and ... -
Bycatch reduction in the deep-water shrimp (Pandalus borealis) trawl fishery with a large mesh top panel
(Journal article; Peer reviewed, 2021)In the Northeast Atlantic deep-water shrimp (Pandalus borealis) trawl fishery, the bycatch of juvenile fish and shrimp represents a problem. This study evaluated if inserting a 200 mm mesh size top-panel in the last three ... -
Vortex system around a step cylinder in a turbulent flow field
(Peer reviewed; Journal article, 2021)The vortex system around the step surface of a step cylinder with a diameter ratio D/d=2 at Reynolds number (ReD) 3900 was investigated by directly solving the three-dimensional Navier–Stokes equations. Formation mechanisms ... -
Design and Dynamic Analysis of a 10-MV Medium-Speed Drivetrain in Offshore Wind Turbines
(Doctoral theses at NTNU;2021:124, Doctoral thesis, 2021)This thesis deals with design and dynamic analysis of 10-MW medium-speed drivetrains for large-scale offshore wind turbines. Many issues related to two main topics, drivetrain design and dynamic analysis, have been ... -
Effect of environmental modelling and inspection strategy on the optimal design of floating wind turbines
(Peer reviewed; Journal article, 2021)In order to reduce design conservatism and consequently the cost of energy, appropriate and cost-optimal safety factors should be derived, in light of environmental load uncertainties and lifetime costs. In the present ... -
Co-Simulation of a Marine Hybrid Power System for Real-Time Virtual Testing
(Chapter, 2021)Co-simulation enhances the efficient simulation development even for complex systems reducing time to market and computational effort. This work aims to develop a marine hybrid power system simulator using a co-simulation ... -
The organizational climate for psychological safety: Associations with SMEs' innovation capabilities and innovation performance
(Peer reviewed; Journal article, 2020)This paper conceptualizes psychological safety as an organizational level phenomenon, andproposes that an organizational climate for psychological safety is positively related to SMEs'innovation performance and innovation ... -
DC-DC Converter Control for Peak-Shaving in Shipboard DC Power System via Hybrid Control
(Chapter, 2020)For the stable operation of the shipboard hybrid DC power systems, the DC bus voltage should be controlled within the recommended range by the regulations. However, the challenge comes from the load variations, and it makes ... -
Prediction of deepwater riser VIV with an improved time domain model including non-linear structural behavior
(Peer reviewed; Journal article, 2021)In this paper, vortex-induced vibrations (VIV) of deepwater risers including the VIV-induced tension fluctuations were simulated using a time domain VIV model. Data from a large-scale riser experiment was applied for ... -
Simulating High-Mode Vortex-Induced Vibration of a Riser in Linearly Sheared Current Using an Empirical Time-Domain Model
(Peer reviewed; Journal article, 2021)As the development of offshore oil and gas continues to move into deeper waters, the risers connecting the seabed infrastructure to the offshore platform are getting longer. This means that vortex-induced vibration (VIV) ... -
Influence of Mean Tension on Mooring Line Fatigue Life
(Chapter, 2020)Studies published in recent years have documented a significant mean load effect on fatigue capacity for offshore mooring chain, and show that a reduction of the mean load gives an increase in fatigue life. However, current ... -
Definition of the INO WINDMOOR 12 MW base case floating wind turbine
(Research report, 2021)WINDMOOR is a Competence Building Project (KPN), with the main objective of improving the understanding of loads governing the mooring system design of floating wind turbines (FWTs). As a base case, the project adopts a ... -
Control of power generated by a floating offshore wind turbine perturbed by sea waves
(Peer reviewed; Journal article, 2020)Offshore wind energy is expected to provide a signi cant contribution to the achievement of the European Renewable Energy targets. One of the main technological issues affecting oating offshore wind turbines con- cerns ... -
Structural reliability analysis of contact fatigue design of gears in wind turbine drivetrains
(Peer reviewed; Journal article, 2020)Advances in the design of large scale wind turbines have raised an interest for more optimized life cycle design of mechanical components (e.g. gears, bearings, shafts, etc.), with a better understanding of their performance ... -
Study on the static behavior of installing a deep-water drilling riser on a production platform
(Peer reviewed; Journal article, 2020)Riser interference caused by wake effects between adjacent risers severely threatens the safety during riser installation process on a Dry-Tree Tension Leg Platform (TLP) system. Due to the ignorance of interference effect, ... -
Experimental and numerical studies on dynamic stress and curvature in steel tube umbilicals
(Peer reviewed; Journal article, 2020)The present paper addresses the stresses in dynamic steel tube umbilicals at the platform hang-off exposed to large motions corresponding to an extreme storm condition. Experimental tests were carried out by mounting ... -
Review of cage and containment tank designs for offshore fish farming
(Journal article, 2020)Fish farm operators worldwide are planning to move offshore due to lack of available nearshore production sites in heavily utilized coastal zones, where there is increasing community opposition to coastal development and ... -
Force Tracking Using Actuated Winches with Position-Controlled Motors for Use in Hydrodynamical Model Testing
(Peer reviewed; Journal article, 2021)In this paper, we consider the problem of accurate force control using actuated winches, intended for use in real-time hybrid hydrodynamic model testing. The paper is also relevant to other cable-driven parallel robot ... -
Prediction of goldsinny wrasse (Ctenolabrus rupestris) minimum size required to avoid escape through salmon (Salmo salar) farm nets
(Peer reviewed; Journal article, 2021)The salmon (Salmo salar) aquaculture industry has used various practices to treat salmon louse (Lepeophtheirus salmonis) infections, including mechanical, thermal, and chemical treatments. However, due to the environmental ... -
Note on estimating bed shear stress caused by breaking random waves
(Peer reviewed; Journal article, 2021)This note presents a method of how the bed shear stress caused by breaking random waves on slopes can be estimated. This is obtained by adopting the Sumer et al. (2013) bed shear stress formula due to spilling and plunging ...
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