Browsing Institutt for marin teknikk by Subject "VDP::Teknologi: 500::Marin teknologi: 580"
Now showing items 1-20 of 40
-
A Unified Framework for Fault Detection and Diagnosis Using Particle Filter
(Journal article; Peer reviewed, 2014)In this paper, a particle filter (PF) based fault detection and diagnosis framework is proposed. A system with possible faults is modeled as a group of hidden Markov models representing the system in fault-free mode and ... -
Advances in semi-empirical time domain modelling of vortex-induced vibrations
(Doctoral theses at NTNU;2018:135, Doctoral thesis, 2018)Most of today’s prediction tools for vortex-induced vibrations (VIV) operate in the frequency domain, where analysis is restricted to linear systems and steady flows. These modelling limitations provide an unsatisfactory ... -
Autonomous Exploration for Marine Minerals
(Doctoral theses at NTNU;2022:393, Doctoral thesis, 2022)The availability of minerals is essential for the production of goods and the development of sustainable technologies. The mineral demand is expected to increase in the coming years as a result of population growth and ... -
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 ... -
Dynamics of Remotely Operated Underwater Vehicle Systems
(Doctoral theses at NTNU;2018:224, Doctoral thesis, 2018)The dynamics of typical remotely operated vehicle (ROV) systems are considered, and the subject is divided into three topics. Topic 1 considers the dynamics of single-body and multi-body ROVs, topic 2 considers the dynamics ... -
Efficient Modelling and Design Optimization of Large Floating Wind Turbines
(Doctoral theses at NTNU;2020:356, Doctoral thesis, 2020)Floating wind turbines (FWTs) are considered a promising solution for wind energy harvesting in deep water, but are currently too expensive to compete with other energy sources. Being a relatively new and immature technology ... -
Estimation of Long-Term Fatigue and Extreme Responses of Large-Diameter Monopiles for Offshore Wind Turbines
(Doctoral theses at NTNU;2024:26, Doctoral thesis, 2024)Offshore wind energy is a crucial part of the global effort to transition towards a decarbonized energy system. In this context, the foundations used to support offshore wind turbines (OWTs) play a significant role in ... -
Exploring the performance of conceptual offshore production systems for deep-sea mining
(Doctoral theses at NTNU;2023:176, Doctoral thesis, 2023)Offshore production systems are required to support the extraction, lifting, and shipment of deep-seabed minerals. Increasing the knowledge about such novel systems is important to identify constrained parameters and ... -
Fatigue reliability of offshore Mooring chains under influence of mean load and corrosion
(Doctoral theses at NTNU;2023:196, Doctoral thesis, 2023)A number of full-scale fatigue tests have been conducted for offshore mooring chain in the last decade for both new and used chains, retrieved after operation in the North Sea. The surface condition of the used chains vary ... -
Fish-Inspired Propulsion Study: Numerical Hydrodynamics of Rigid/Flexible/Morphing Foils and Observations on Real Fish
(Doctoral theses at NTNU;2023:7, Doctoral thesis, 2023)Many swimming fishes in nature have been endowed with high hydrodynamic efficiency and performance, such as low resistance, high speed, and good maneuverability, both when swimming individually and in groups, i.e., using ... -
Hydrodynamic Aspects of Sail-Assisted Merchant Vessels
(Doctoral theses at NTNU;2022:190, Doctoral thesis, 2022)Modern sail technology is a potential solution for reducing the fuel consumption for merchant ships. This can be used to either reduce the emission of greenhouse gasses with conventional fuels, or the cost related to ... -
Hyperspectral Push-broom Systems: Operations, Software Development, and Spatial Resolution
(Doctoral theses at NTNU;2024:19, Doctoral thesis, 2024)Remote sensing satellites that provide hyperspectral imagery promise to be a valuable source of information and enable new applications. The _rst satellite from the NTNU Small-Satellite laboratory, the Hyperspectral Small ... -
Image Techniques for Identifying Sea-Ice Parameters
(Journal article; Peer reviewed, 2014)The estimation of ice forces are critical to Dynamic Positioning (DP) operations in Arctic waters. Ice conditions are important for the analysis of ice-structure interaction in an ice field. To monitor sea-ice conditions, ... -
Information and Decision-making for Major Accident Prevention – A concept of information-based strategies for accident prevention
(Doctoral theses at NTNU;2022:379, Doctoral thesis, 2022)With wide application of sensors and digitalization for accident prevention and safety management of sociotechnical systems, distributed decision-makers rely on information supplied for their decision-making more than ever. ... -
Isogeometric Phase-Field Methods for Modeling Fracture in Shell Structures
(Doctoral theses at NTNU;2021:87, Doctoral thesis, 2021)The simulation of the fracture of engineering structures is a challenging topic that requires accurate and efficient numerical models. This thesis focuses on the modeling of brittle and ductile fracture in thin shell structures ... -
Long-Term Extreme Response Analysis of Marine Structures Using Inverse Reliability Methods
(Doctoral theses at NTNU;2017:298, Doctoral thesis, 2017)For the assessment of extreme responses needed in design of marine structures, a full long-term analysis is recognized as the most accurate approach. However, due to the very large number of structural response analyses ... -
Mechanical and Thermal Simulations of 3D Printed Structures and the 3D Printing Process
(Doctoral theses at NTNU;2023:311, Doctoral thesis, 2023)Additive manufacturing (AM), often referred to as three-dimensional (3D) printing, has become one the fastest growing manufacturing technologies across a variety of engineering fields after transitioning from being a ... -
Model-Based Design of Marine Hybrid Power Systems - With a case study of DC Grid Architecture and Control
(Doctoral theses at NTNU;2023:346, Doctoral thesis, 2023)Marine electrification and hybridization with DC power systems topology are still under development with advanced power electronics, energy storage systems (ESS), and their associated controllers to cope with stricter ... -
Modeling and Control for Dynamic Positioned Marine Vessels in Drifting Managed Sea Ice
(Journal article; Peer reviewed, 2014)This paper presents a development framework for dynamic positioning control systems for marine vessels in managed ice. Due to the complexity of the vessel-ice and ice-ice interactions a configurable high fidelity numerical ... -
Modeling and Hybrid Feedback Control of Underwater Vehicles
(Doctoral theses at NTNU;2023:130, Doctoral thesis, 2023)This thesis presents contributions to the mathematical modeling of underwater vehicles and nonlinear hybrid feedback control. We present a matrix Lie group formulation of the standard model describing the motion of rigid ...