Blar i Institutt for marin teknikk på dokumenttype "Peer reviewed"
Viser treff 21-40 av 1110
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A fully coupled method for numerical modeling and dynamic analysis of floating vertical axis wind turbines
(Journal article; Peer reviewed, 2017)Offshore wind energy is one of the most promising renewable energy resources and an increasing interest arises to develop floating vertical axis wind turbines (VAWTs), which have the potential to reduce the cost of energy. ... -
A global slamming force model for offshore wind jacket structures
(Journal article; Peer reviewed, 2018)Under certain harsh environmental conditions, jacket structures supporting offshore wind turbines might be exposed to plunging breaking waves, causing slamming forces that affect the structural integrity and fatigue life. ... -
A harmonic polynomial cell (HPC) method for 3D Laplace equation with application in marine hydrodynamics
(Journal article; Peer reviewed, 2014)We propose a new efficient and accurate numerical method based on harmonic polynomials to solve boundary value problems governed by 3D Laplace equation. The computational domain is discretized by overlapping cells. Within ... -
A large scale simulation of floe-ice fractures and validation against full-scale scenario
(Journal article; Peer reviewed, 2018)While interacting with a sloping structure, an ice floe may fracture in different patterns. For example, it can be local bending failure or global splitting failure depending on the contact properties, geometry and confinement ... -
A method for estimation of equivalent-volume ice thickness based on WMO egg code in absence of ridging parameters
(Journal article; Peer reviewed, 2018)When calculating equivalent-volume ice thickness along a vessel's projected route for the purpose of ice resistance estimation, information on both undeformed ice (level ice) and deformed ice (mainly ridges) is needed. ... -
A method for real-time estimation of full-scale global ice loads on floating structures
(Journal article; Peer reviewed, 2018)This paper proposes an algorithm that uses conventional measurements found on-board ships coupled with additional Inertial Measurement Units to estimate the motions and global loads acting on them. The work is motivated ... -
A multi-body dynamic model based on bond graph for maritime hydraulic crane operations
(Chapter; Peer reviewed, 2015)This paper presents a bond graph model of a maritime crane lifting system comprised of a 3DOFs crane with three revolute joints, a winch, a segment of wire, and a pendulum load. The multi-body model contains the dynamic ... -
A Multibeam-Based SLAM Algorithm for Iceberg Mapping Using AUVs
(Journal article; Peer reviewed, 2018)Using autonomous underwater vehicles (AUVs) for mapping underwater topography of sea-ice and icebergs, or detecting keels of ice ridges, is foreseen as enabling technology in future Arctic marine operations. Wind, current, ... -
A natural framework for isogeometric fluid-structure interaction based on BEM-shell coupling
(Journal article; Peer reviewed, 2017) -
A new method for underwater archaeological surveying using sensors and unmanned platforms
(Journal article; Peer reviewed, 2016)As most of the world’s oceans are inaccessible to diving archaeologists, we must rely on advanced underwater technology and marine robotics to explore, map and investigate ship wrecks in these areas. New sensors and unmanned ... -
A numerical study of the second-order wave excitation of ship springing by a higher-order boundary element method
(Journal article; Peer reviewed, 2014)This paper presents some of the efforts by the authors towards numerical prediction of springing of ships. A time-domain Higher Order Boundary Element Method (HOBEM) based on cubic shape function is first presented to solve ... -
A Numerical Study on a Flopper Stopper for Leg Positioning of a Jack-Up Barge
(Chapter; Peer reviewed, 2017)Jack-up barges are commonly used for marine operations in the offshore oil and gas, and offshore wind industries. A critical phase within the marine operation activities is the positioning of the jack-up legs onto the ... -
A numerical study on vortex-induced vibrations and the effect of slurry density variations on fatigue of ocean mining risers
(Journal article; Peer reviewed, 2019)Ocean mining emerges as a way of meeting future demands for valuable minerals. Risers conveying ore from the seabed to the surface must withstand large wave and current loads. In addition, vortex-induced vibrations (VIV) ... -
A parametric study on the final blade installation process for monopile wind turbines under rough environmental conditions
(Journal article; Peer reviewed, 2018)Single blade installation is a method for installing wind turbine blades. If a jack-up vessel is used during an o shore installation, the wind turbine blade is mainly subjected to wind loads and experiences resonant motions, ... -
A particle filter SLAM approach to online iceberg drift estimation from an AUV
(Chapter; Peer reviewed, 2017)Using autonomous underwater vehicles (AUVs) for mapping the underwater topography of sea-ice and icebergs, or detecting keels of ice ridges, is foreseen as an enabling technology in future Arctic offshore operations. This ... -
A probabilistic approach for the quantification of prediction error in deterministic phase-resolved wave forecasting
(Journal article; Peer reviewed, 2018)This paper presents a semi-analytical methodology for the determination of prediction error statistics in deterministic sea wave predictions (DSWP), based on linear wave models. The underlying wave elevation is modelled ... -
A prognostic method for fault detection in wind turbine drivetrains
(Journal article; Peer reviewed, 2014)In this paper, a prognostic method is presented for fault detection in gears and bearings in wind turbine drivetrains. This method is based on angular velocity measurements from the gearbox input shaft and the output to ... -
A review of slamming load application to offshore wind turbines from an integrated perspective
(Journal article; Peer reviewed, 2017)In harsh sea conditions, it is possible for offshore wind turbines (OWTs) to be exposed to slamming loads due to breaking waves, especially plunging breaking waves. These slamming loads lead to significant structural ... -
A risk model for autonomous marine systems and operation focusing on human–autonomy collaboration
(Journal article; Peer reviewed, 2017)Autonomous marine systems, such as autonomous ships and autonomous underwater vehicles, gain increased interest in industry and academia. Expected benefits of autonomous marine system in comparison to conventional marine ... -
A semi-analytical frequency domain model for efficient design evaluation of spar floating wind turbines
(Journal article; Peer reviewed, 2019)A linear model for efficient design evaluation of spar floating wind turbines is presented, and verified against a nonlinear time domain model with regards to long-term fatigue and short-term extreme response for two ...