Blar i Institutt for marin teknikk på tittel
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On Formal Methods for Design and Verification of Maritime Autonomous Surface Ships
(Journal article, 2022)Maritime Autonomous Surface Ships (MASS) are approaching a reality, introducing a new level of complexity and criticality to maritime control systems. In this paper we investigate how Formal Methods (FMs) can be used to ... -
On ice model validation and calibration strategies for damage as-sessment of structures subjected to impact actions
(Chapter, 2016)The number of numerical ice models in structural design is growing, and classical Lagrangian finite element formulation is still dominant for numerical simulations. In design of ships and offshore structures, the numerical ... -
On Initial Design and Modelling of a 10 MW Medium Speed Drivetrain for Offshore Wind Turbines
(Journal article; Peer reviewed, 2019)This paper presents the initial design and modelling of a medium speed drivetrain for the DTU 10 MW offshore wind turbine. Design basis and criteria of the drivetrain are described. Minimum weight and volume of the drivetrain ... -
On long-term fatigue damage and reliability analysis of gears under wind loads in offshore wind turbine drivetrains
(Journal article; Peer reviewed, 2014)In this paper, a long-term fatigue damage analysis method for gear tooth root bending in wind turbine’s drivetrains is presented. The proposed method is established based on the ISO gear design codes which are basically ... -
On model-based system approach for health monitoring of drivetrains in floating wind turbines
(Journal article; Peer reviewed, 2017)This paper deals with the health monitoring of a wind turbine drivetrain in a system perspective. A 5-MW reference drivetrain installed on a spar type floating wind turbine is selected. Degradation and damage in the main ... -
On multi-planar impact mechanics in ship collisions
(Peer reviewed; Journal article, 2019)This paper presents a new solution for ship impact dynamics in multi-planar space. A collision matrix is presented. It is derived on the basis of impact dynamics for rigid bodies. Effective mass factors are introduced ... -
On natural modes in moonpools and gaps in finite depth
(Journal article; Peer reviewed, 2018)In this paper an extension of the theoretical model of Molin (J. Fluid Mech., vol. 430, 2001, pp. 27–50) is proposed, where the assumptions of infinite depth and infinite horizontal extent of the support are released. The ... -
On prediction of torque in flexible pipe reeling operations using a Lagrangian-Eulerian FE framework
(Journal article; Peer reviewed, 2016)In this paper a new framework for FE simulation of reeling operations that utilizes a Lagrangian–Eulerian description of the beam kinematics is proposed. In contrast to the conventional Lagrangian approach, the material ... -
On Reduced Order Drivetrain Model Integrated With Wind Turbine and Wind Farm Simulation Tools
(Master thesis, 2022)Eksisterende vindturbin- og vindparksimuleringsverktøy tenderer til å ha forenklede modeller av drivverket integrert i modellen. Dette gjør simuleringene av drivverket raske, men fanger ikke opp den interne dynamikken i ... -
On Risk of Digital Twin Implementation in Marine Industry: Learning from Aviation Industry
(Journal article; Peer reviewed, 2019)This paper presents some aspects of the risk and challenges associated with digital twin implementation in the marine industry by learning from the aviation industry where the digital twin is more widely employed. The ... -
On short-term fatigue analysis for wind turbine tower of two semi-submersible wind turbines including effect of startup and shutdown processes Research papers
(Peer reviewed; Journal article, 2021)Fatigue limit state design check for offshore wind turbines is based on SN curves and the Palmgren–Miner rule approach and focuses normally on stationary processes for which startup and/or shutdown operations induced ... -
On the Effect of Boundary Conditions on the Flow around a Cylinder in a Channel
(Chapter, 2015)In this paper, the incompressible external flow around an offshore drilling riser with fairings at Reynolds number 5000 is used to study the effects of varying boundary conditions in numerical simulations. We use a direct ... -
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 ...