Browsing Institutt for marin teknikk by Title
Now showing items 517-536 of 3410
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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 ... -
Cable Selection Considerations for Subsea Vehicles
(Chapter, 2018)The aim of this paper is to present a methodology for selecting proper voltage level and power cables as a part of the AC distribution system design for subsea vehicles, such as Remotely Operated Vehicles, seafloor trenchers ... -
Calculation of Added Mass in the Proximity of the Seabed for an Oscillating Disc
(Master thesis, 2012)Calculations have been made with the commercial CFD-software Ansys Fluent, with dynamic mesh. -
Calculation of fatigue damage for tensioned risers from vortex induced vibrations
(Master thesis, 2011)Vortex induced vibration (VIV) of long flexible riser subjecting to ocean currents is ubiquitous in offshore industry. Although significant efforts have done to understand this complicated fluid structure interaction ... -
Calculation of Service and Sea Margins
(Master thesis, 2015)In this thesis two tankers owned by Kristian Gerhard Jebsen Skipsrederi (KGJS) were investigated. A method of calculating service and sea margins for different speeds has been developed. When a ship is in normal operation, ... -
A Calibration Study with CFD Methodology for Self-Propulsion Simulations at Ship Scale
(Peer reviewed; Journal article, 2023)This paper summarises the main findings from the full-scale Computational Fluid Dynamics (CFD) analyses conducted at SINTEF Ocean on the case of MV REGAL, which is one of the benchmark vessels studied in the ongoing joint ... -
Camera-assisted Dynamic Positioning of ROVs
(Master thesis, 2016)When ROVs are operated with manual joysticks, the user will experience a lack of control because of currents and drag forces from the umbilical. This will induce undesirable oscillations and motions that are hard to ... -
Camera-based SLAM for Dynamic Positioning of Low-cost ROV
(Master thesis, 2017)A range of low-cost Remotely Operated Vehicles(ROVs) are currently emerging in the consumer market. In this thesis we are exploring the possibilities of using monocular camera-based Simultaneous Localization And Mapping(SLAM) ... -
Camera-Based State Estimation for Surface Vessels
(Master thesis, 2017)Simultaneous localization and mapping (SLAM) is the twofolded problem of locating a vehi- cle starting at an unknown location and mapping the surrounding environment simultane- ously. This thesis considers the SLAM problem ... -
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, ... -
Can a computer see what an ice expert sees? Multilabel ice objects classification with convolutional neural networks
(Journal article; Peer reviewed, 2019)Computer-aided scene analysis has drawn much attention, especially in autonomous navigation and advanced navigation assistance systems for surface vessels. In ice-infested waters, multilabel ice object classification and ... -
Can the water on deck influence the parametric roll of a FPSO? A numerical and experimental investigation
(Journal article; Peer reviewed, 2014)Parametric roll and water on deck are investigated numerically and experimentally for a FPSO ship in head-sea regular waves in the zone of the first fundamental resonance. On the numerical side, a weakly-nonlinear potential ... -
Capacity of Deep Water Flexible Risers
(Master thesis, 2011)A flexible riser operating in deep water will experience large environmental forces. Due to the length of the riser, dynamic tension from drag forces will be substantial. The tensile force is transferred directly into the ... -
Cargo Stowage Planning in RoRo Shipping: Optimisation Based Naval Architecture
(Master thesis, 2012)Operations research has proven itself to be advantageous in several areas of the industry for many years, but is operations research a good approach to operational maritime planning? Expressions used to calculate the initial ... -
Cavity flows and wake behind an elliptic cylinder translating above the wall
(Doctoral theses at NTNU, 2020:312, Doctoral thesis, 2020)Vortex formation is one of the fundamental modes in fluid mechanics and it can develop in almost every realization of fluid motion. Studying its fundamental dynamics and interactions is of great interest for engineering ... -
CFD in conceptual ship design
(Master thesis, 2011)Computational Fluid Dynamics (CFD) has been around for many years. It is a computer tool that can be used to find the hydrodynamic fluid performances. In ship design it is used in a wide area from smoke propagation to ... -
CFD investigation on scour beneath different configurations of piggyback pipelines under steady current flow
(Peer reviewed; Journal article, 2022)Scour beneath piggyback pipelines laid on a sandy seabed is numerically investigated by solving two-dimensional (2D) Unsteady Reynolds-averaged Navier-Stokes (URANS) equations. The fluid flow and the sediment transport are ... -
Challenges and proposals for managing major accident risk through the planning process
(Journal article; Peer reviewed, 2016)Major accidents are characterized by complex causal patterns with many factors influencing the occurrence of such accidents. The causes can be found not just in the execution of the work, but also in the preparations and ... -
Challenges and Solutions for Autonomous Systems Safety–Findings from three International Workshops (IWASS)
(Chapter, 2023)Autonomous systems intend to be a stepping-stone towards safer and more efficient operations. Extensive mapping and monitoring of land, space, and the oceans, renewable energy harvesting and production, inspection of ... -
Challenges with bringing collision risk models used in the north sea and norwegian sea to the Barents Sea
(Journal article; Peer reviewed, 2015)Norwegian offshore oil and gas exploration and production is moving into new and previously unexplored areas further north, such as the Barents Sea. This poses multiple new challenges in design, development and operation. ...