Blar i Institutt for marin teknikk på tittel
Viser treff 1427-1446 av 3417
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Flow topology in the gap and wake of convex curved tandem cylinders
(Journal article; Peer reviewed, 2023)Flow around curved tandem cylinders in the convex configuration has been studied by means of direct numerical simulations, for a Reynolds number of 500 and a nominal gap ratio of 3.0. Spanwise variation of flow regimes, ... -
A flow-through imaging system for automated measurement of ichthyoplankton
(Peer reviewed; Journal article, 2022)Microscopic imaging and morphometric measurement of fish embryos and larvae is essential in environmental monitoring of fish populations and to evaluate larvae development in aquaculture. Traditional microscopy methods ... -
Fluid flow in steady and oscillatory lid-driven square cavities
(Peer reviewed; Journal article, 2017)This paper presents numerical simulations of steady and oscillatory lid-driven cavity flow at different Reynolds numbers with a fixed aspect ratio of 1:1. A projection method (P2 pressure correction method) is applied to ... -
Fluid Structure Interaction Analysis of Abnormal Wave Slamming Event
(Master thesis, 2021)Offshore-konstruksjoner er utsatt for risikoen med voldsomme hydrodynamiske slagkrefter fra brytende bølger eller nær brytende bølger. Beregning av belastningen fra disse hendelsene har vist seg å være utfordrende på grunn ... -
Fluid Structure Interaction Analysis of Abnormal Wave Slamming Events
(Master thesis, 2018)In critical sea states, slamming wave loads may cause severe structural damage to marine structures. The slamming loads are associated with fluid-structure impacts with high pressures and short durations. The structural ... -
Fluid Structure Interaction Analysis of Abnormal Wave Slamming Events
(Master thesis, 2022)I ekstreme sjøtilstandar kan bølgeslag påføre marine konstruksjonar store deformasjonar. Bølgeslag påfører konstruksjonen høge trykk med store variasjonar i tid og stad. Samankoplinga mellom hydrodynamiske laster og ... -
Fluid-structure-interaction analysis of an ice block-structure collision
(Journal article; Peer reviewed, 2015)Due to climate change, production and transportation routes in Arctic regions are becoming more prevalent. When operating in Arctic waters, there is a significant risk of high energy encounters with smaller ice masses such ... -
Flytebro med nytt forankringssystem
(Master thesis, 2013)Hensikten med denne oppgaven er å evaluere et nytt flytebro konsept for Sognefjor- den. Flere grunnleggende design har vist seg å være hensiktsmessige og gjennom- førbare, og konseptet med forankret kunstig sjøbunn inkludert ... -
Foil Motion Control av høyhastighetskatamaraner
(Master thesis, 2019)Skip som opererer ved høye hastigheter utsettes regelmessig for kraftige bølgeinduserte belastninger og vibrasjoner forårsaket av store bevegelser og akselerasjoner. Et neddykket foilsystem kombinert med en kontrollalgoritme ... -
Force actuated real-tme hybrid model testing of a moored vessel: A case study investigating force errors
(Journal article; Peer reviewed, 2018)This paper presents a study where real-time hybrid testing is used to emulate a moored barge. The barge is modelled physically while the mooring forces are simulated numerically and actuated onto the physical substructure. ... -
Force Field Identification and Positioning Control of an Autonomous Vessel using Inertial Measurement Units
(Master thesis, 2017)In this thesis, a system of four sensors for measuring tri-axis translational accelerations and rotational velocities is designed. The sensors were mounted with a spatial distribution on board the ship model C/S Arctic ... -
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 ... -
Force-Based Real-Time Hybrid Testing: Force Actuation System
(Master thesis, 2017)Real-time hybrid model testing is the name given to the real-time coupling of experimental and numerical testing methods. It is based on dividing complex structures into two system parts; one that is simulated numerically, ... -
Forces and torques on a prolate spheroid: low-Reynoldsnumber and attack angle effects
(Journal article; Peer reviewed, 2018)The three-dimensional flow field around a prolate spheroid has been obtained by integration of the full Navier–Stokes equations at Reynolds numbers 0.1, 1.0, and 10. The 6:1 spheroid was embedded in a Cartesian mesh by ... -
Forces on a net panel
(Master thesis, 2011)Four different methods for calculating forces on and deformation of a net suspended in current have been compared. The four methods are: 1) The method presented by Løland in his PhD thesis. Uses drag and lift coefficients ... -
Formal approaches to design and verification of safe control systems for autonomous vessels
(Doctoral theses at NTNU;2023:70, Doctoral thesis, 2023)Maritime autonomy can positively impact society by cutting costs and emissions while enabling new solutions for transportation and mobility. Autonomous vessels must be capable of performing complex tasks under significant ... -
Formal Safety Assessment of an Open Loop System
(Master thesis, 2015)Shipping burns approximately 300 million tonnes of fuel per year, and 12 million tonnes of sulphur oxides (SOx) are emitted, annually. The International Maritime Organization (IMO) set the standards for the safety, security ... -
Formal Safety Assessment of Dynamically Positioned Vessels
(Master thesis, 2015)The main objective of this paper is to make use of the Bayesian Belief Network (BBN) method for analysis of marine accidents in relation to Dynamic Positioning incidents (DP-incidents), and try to improve upon the model ... -
Formation control of marine vessels
(Master thesis, 2011)As an enabling technology of coordinated multi-vessel operations, formation control has received considerable attention in recent times, with specific applications ranging from satellites in space to wheeled robots on the ... -
Formulation and Application of Finite Element techniques for Slender Marine Structures Subjected to Contact Interactions
(Doctoral thesis at NTNU;2015:99, Doctoral thesis, 2015)The main purpose of this work is to formulate and apply new computational strategies for two contact-governed problems where existing finite element software suffer from poor efficiency and lack of robustness. The first ...