Blar i Institutt for marin teknikk på tittel
Viser treff 2406-2425 av 3472
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On the improvement of computational efficiency of smoothed particle hydrodynamics to simulate flexural failure of ice
(Journal article; Peer reviewed, 2018)The finite element method (FEM) has been extensively applied to model failure of ice but suffers from mesh distortion especially when fracture or fragmentation is involved. The smoothed particle hydrodynamics (SPH) method ... -
On the Joint Distribution of Excursion Duration and Amplitude of a Narrow-Band Gaussian Process
(Journal article; Peer reviewed, 2018)The probability density of crest amplitude and duration that exceeds a given level is used in many theoretical and practical problems in engineering that are subjected to fluctuating loads such as wind and wave loads. The ... -
On the modelling of heat exchangers and heat exchanger network dynamics using bond graphs
(Journal article; Peer reviewed, 2018)Heat exchanger networks are important systems in most thermal engineering systems and are found in applications ranging from power plants and the process industry to domestic heating. Achieving cost-effective design of ... -
On the need for online decision support in FPSO-shuttle tanker collision risk reduction
(Journal article; Peer reviewed, 2015)More than 100 Floating Production Storage and Off-loading (FPSO) concepts are in operation at the moment worldwide, and due to increasing demand many are currently under construction or being converted from commercial ... -
On the numerical stability in dynamical distributed simulations
(Journal article; Peer reviewed, 2019)This work takes aim at studying numerical stability in distributed simulations through dynamic stabilityand stability criteria for explicit solvers. This is done by studying outer stability limits, for example stabilityconditions ... -
On the role of added mass and vorticity release for self-propelled aquatic locomotion
(Peer reviewed; Journal article, 2021)Aquatic locomotion of a deformable body from rest up to its asymptotic speed is given by the unsteady motion which is produced by a series of periodic reactions dictated by the body configuration and by the style of swimming. ... -
On the sensitivity and uncertainty of wave energy conversion with an artificial neural-network-based controller
(Peer reviewed; Journal article, 2019)This work addresses with sensitivity and uncertainty of the energy conversion of an oscillation-body wave energy converter with an artificial neural-network-based controller. The smart controller applies the model predictive ... -
On the significance of the higher-order stress in riser vortex-induced vibrations responses
(Journal article; Peer reviewed, 2019)Vortex-induced vibrations (VIV) can lead to fast accumulation of fatigue damage and increased drag loads for slender marine structures. VIV responses mainly occur at the vortex shedding frequency, while higher harmonics ... -
On the suppression of vortex induced vibrations of circular cylinders by radial water jets
(Doktoravhandlinger ved NTNU, 1503-8181; 2003:58, Doctoral thesis, 2003)For oilfield developments in deep water, it is of utmost importance to accurately predict Vortex Induced Vibrations (VIV) of risers and free span pipelines subjected to ocean current. In order to prolong operational life ... -
On Tower Top Axial Acceleration and Drivetrain Responses in a Spar-Type Floating Wind Turbine
(Chapter; Peer reviewed, 2017)Common industrial practice for designing floating wind turbines is to set an operational limit for the tower-top axial acceleration, normally in the range of 0.2–0.3g, which is typically understood to be related to the ... -
On Uncertainty Assessment of Fatigue Damage of Propulsion Shaft Under Ice Impact
(Chapter, 2021)In this paper, the importance of maintenance of marine propulsion is discussed with specific focus on the use of condition monitoring to inform maintenance schedules. The design requirements of DNV GL for shafts expected ... -
On-Bottom Hydrodynamic Stability of Offshore Pipelines Performing 3D Analysis in SIMLA
(Master thesis, 2020)Målet med denne masteroppgaven er å utføre en 3D hydrodynamisk stabilitetsanalyse av en undervannsrørledning på sjøbunn, for å demonstrere fordelene med en 3D funksjonalitet sammenlignet med eksisterende metoder. Hydrodynamisk ... -
Onboard DC Power Systems for Hybrid Electric Ships: Simulation and Control
(Master thesis, 2018)The main contribution of this thesis is to build a complete model of the onboard DC power system for the simulation and control. The development motivation of the DC power system is for the better fuel economy to reduce ... -
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 ... -
Onboard Tuning and Uncertainty Estimation of Vessel Seakeeping Model Parameters
(Doctoral theses at NTNU;2021:356, Doctoral thesis, 2021)The accurate prediction of critical vessel motions is essential for safe and cost-efficient marine operations. Compared with the difference-frequency responses that can be compensated by mooring and dynamic positioning ... -
Onboard tuning of vessel seakeeping model parameters and sea state characteristics
(Peer reviewed; Journal article, 2021)It is essential for a safe and cost-efficient marine operation to improve the knowledge about the real-time onboard vessel conditions. This paper proposes a novel algorithm for simultaneous tuning of important vessel ... -
Online condition monitoring of floating wind turbines drivetrain by means of digital twin
(Journal article; Peer reviewed, 2021)This paper presents a digital twin (DT) condition monitoring approach for drivetrains on floating offshore wind turbines. Digital twin in this context consists of torsional dynamic model, online measurements and fatigue ... -
Online Consequence Analysis of Situational Awareness for Autonomous Vehicles
(Master thesis, 2018)The maritime industry is undergoing substantial changes with regards to autonomy, and lately important steps has been done in realizing highly autonomous vessels for industry use. This master s thesis presents a framework ... -
Online Digital Twin and a Decision Support for Safe Maneuvering of R/V Gunnerus
(Master thesis, 2023)This thesis will present the development of an online digital twin for NTNU's Research Vessel Gunnerus. Maritime digital twins are becoming a more and more prevalent technology used for the development, maintenance, and ... -
Online Optimization of a Hybrid Electric Marine Power Plant Using Mixed Integer Linear Programming
(Master thesis, 2020)Denne masteroppgaven presenterer et litteraturstudie om temaene hybrid-elektriske kraft- og fremdriftssystemer og optimalisering og regulering av hybride kraftsystemer. Komponenter, karakteristikker og reguleringslag ved ...