Blar i Institutt for marin teknikk på dokumenttype "Peer reviewed"
Viser treff 1-20 av 1110
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1453. Comparison of the ride performance of an integrated suspension model
(Journal article; Peer reviewed, 2014)Vehicle suspension is one of the important components to reduce vibration from the road. The vehicle seat suspension acts as another component to provide ride comfort, especially to reduce driver fatigues for long hour’s ... -
A 2D+t approach for the transverse viscous loads in a modular maneuvering model
(Peer reviewed; Journal article, 2021)The importance of the transverse viscous loads, in a modular maneuvering model, is investigated. A method to estimate steady sectional drag coefficients is first presented. A 2D+t approach, which accounts for forward-speed ... -
A 3D fully-nonlinear potential-flow solver for efficient simulations of large-scale free-surface waves
(Journal article; Peer reviewed, 2022) -
3D motion dynamics of axisymmetric bodies falling through water
(Journal article; Peer reviewed, 2018)A new simplified method for analysis of 3D motion dynamics of axisymmetric slender bodies falling from air through water is presented. Slender-body theory for potential flow of incompressible water is combined with 2D + t ... -
A 5MW direct-drive generator for floating spar-buoy wind turbine: Drive-train dynamics
(Journal article; Peer reviewed, 2017)This article proceeds with investigations on a 5 MW direct-drive floating wind turbine system (FWTDD) that was developed in a previous study. A fully integrated land-based direct-drive wind turbine system (WTDD) was created ... -
A Bayesian approach to risk modeling of autonomous subsea intervention operations
(Journal article; Peer reviewed, 2018)The introduction of autonomy in subsea operations may affect operational risk related to Inspection, Maintenance, and Repair (IMR). This article proposes a Bayesian Belief Network (BBN) to model the risk affecting autonomous ... -
A brute-force spectral approach for wave estimation using measured vessel motions
(Journal article; Peer reviewed, 2018)The article introduces a spectral procedure for sea state estimation based on measurements of motion responses of a ship in a short-crested seaway. The procedure relies fundamentally on the wave buoy analogy, but the wave ... -
A combined wind and wave energy-converter concept in survivalmode: Numerical and experimental study in regular waves with afocus on water entry and exit
(Journal article; Peer reviewed, 2017)Water entry (including slamming) and exit phenomena as well as green water on deck were observed during survivability model tests of a combined wind and wave energy converter concept. Here, a nonlinear numerical ... -
A comparative study of different methods for predicting the long-term extreme structural responses of the combined wind and wave energy concept semisubmersible wind energy and flap-type wave energy converter
(Journal article; Peer reviewed, 2018)The combined wind and wave concept semisubmersible wind energy and flap-type wave energy converter was developed in the EU FP7 project MARINA Platform. It consists of a four-column semisubmersible with a 5-MW wind turbine ... -
A comparative study of the stochastic averaging method and the path integration method for nonlinear ship roll motion in random beam seas
(Journal article; Peer reviewed, 2017)In this paper, the energy-based stochastic averaging method and the path integration method are applied to study the stochastic response of the nonlinear roll motion in random beam seas. Specifically, the Markov diffusion ... -
A comparative study on dynamic responses of spar-type floating horizontal and vertical axis wind turbines
(Journal article; Peer reviewed, 2017)Interest in the exploitation of offshore wind resources using floating wind turbines has increased. Commercial development of floating horizontal axis wind turbines (FHAWTs) is emerging because of their commercial success ... -
A comparison of extreme structural responses and fatigue damage of semi-submersible type floating horizontal and vertical axis wind turbines
(Journal article; Peer reviewed, 2017)Currently development of floating wind turbines for deep water is mainly based on horizontal axis wind turbines (HAWTs). However, floating vertical axis wind turbines (VAWTs) are possible alternative due to their potential ... -
A comparison of physical and numerical modeling of homogenous isotropic propeller blades
(Journal article; Peer reviewed, 2020)Results of the fluid-structure co-simulations that were carried out as part of the FleksProp project are presented. The FleksProp project aims to establish better design procedures that take into account the hydroelastic ... -
A comparison of two fully coupled codes for integrated dynamic analysis of floating vertical axis wind turbines
(Journal article; Peer reviewed, 2017)This paper presents a comparison of two state-of-the-art codes that are capable of modelling floating vertical axis wind turbines (VAWTs) in fully coupled time-domain simulations, being the HAWC2 by DTU and the SIMO-RIFLEX-AC ... -
A Comprehensive Survey of Prognostics and Health Management based on Deep Learning for Autonomous Ships
(Journal article; Peer reviewed, 2019)The maritime industry widely expects to have autonomous and semiautonomous ships (autoships) in the near future. In order to operate and maintain complex and integrated systems in a safe, efficient, and cost-beneficial ... -
A Crane Overload Protection Controller for Blade Lifting Operation Based on Model Predictive Control
(Journal article; Peer reviewed, 2019)Lifting is a frequently used offshore operation. In this paper, a nonlinear model predictive control (NMPC) scheme is proposed to overcome the sudden peak tension and snap loads in the lifting wires caused by lifting speed ... -
A discrete-modules-based frequency domain hydroelasticity method for floating structures in inhomogeneous sea conditions
(Journal article; Peer reviewed, 2017)Based on the three-dimensional (3D) potential theory and finite element method (FEM), this paper proposes a new numerical method for hydroelastic predictions of floating structures in inhomogeneous seabed and wave field ... -
A displacement-free formulation for the Timoshenko beam problem and a corresponding isogeometric collocation approach
(Journal article; Peer reviewed, 2017)We present a reformulation of the classical Timoshenko beam problem, resulting in a single differential equation with the rotation as the only primal variable. We show that this formulation is equivalent to the standard ... -
A distributed anti-collision decision support formulation in multi-ship encounter situations under COLREGs
(Journal article; Peer reviewed, 2015)A multi-ship anti-collision decision support formulation is studied in a distributed and real time way. Under the general requirements from COLREGs rules and regulations, the performance of course alteration and changing ... -
A framework for isogeometric-analysis-based optimization of wind turbine blade structures
(Journal article; Peer reviewed, 2018)Early‐stage wind turbine blade design usually relies heavily on low‐fidelity structural models; high‐fidelity, finite‐element‐based structural analyses are reserved for later design stages because of their complex workflows ...