Blar i Fakultet for ingeniørvitenskap (IV) på tidsskrift "Marine Structures"
Viser treff 1-20 av 87
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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 comparative analysis of the fluid-structure interaction method and the constant added mass method for ice-structure collisions
(Journal article, 2016)The constant added mass (CAM) method and the fluid-structure interaction (FSI) method are widely used to simulate ship-ship and ship-ice collisions. In the CAM method, the hydrodynamic effect of the surrounding water is ... -
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 macro-element for integrated time domain analyses representing bucket foundations for offshore wind turbines
(Journal article; Peer reviewed, 2018)The paper presents a macro-element model for bucket foundations to be used in integrated time domain analyses of offshore wind turbines. The macro-element has been formulated in the multi-surface plasticity framework, and ... -
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 ... -
Active heave compensation of floating wind turbine installation using a catamaran construction vessel
(Peer reviewed; Journal article, 2021)The application of floating wind turbines is limited by the high cost that increases with the water depth. Offshore installation and maintenance continue to consume a high percentage of the project budget. To improve the ... -
Algorithmic formulation of clay and sand pipe–soil interaction models for on-bottom stability analysis
(Peer reviewed; Journal article, 2021)This paper presents a new algorithmic formulation of the clay and sand pipe–soil interaction models recommended by the DNV-RP-F109 code for dynamic on-bottom stability analysis of submarine pipelines. The pipe–soil force ... -
An anisotropic friction model in non-bonded flexible risers
(Journal article; Peer reviewed, 2018)The present paper addresses small scale friction tests and an anisotropic friction model to predict friction for the interface between the anti-wear tape and tensile armors in non-bonded flexible risers. Small scale friction ... -
Analysis and design of offshore tubular members against ship impacts
(Journal article, 2018)Ship collisions may be critical to the operational safety of ships and offshore structures, and should be carefully designed against. This paper investigates the response of offshore tubular members subjected to vessel bow ... -
Analysis of fatigue test data of retrieved mooring chain links subject to pitting corrosion
(Peer reviewed; Journal article, 2021)Fatigue is one of the main failure mechanisms of catenary type mooring lines. Fatigue resistance is affected by a large number of factors. In this paper, the effect of pitting corrosion on the fatigue resistance of mooring ... -
Analysis of lifting operation of a monopile for an offshore wind turbine considering vessel shielding effects
(Journal article; Peer reviewed, 2014)This study addresses numerical simulations of the lifting operation of a monopile for an offshore wind turbine with a focus on the lowering process. A numerical model of the coupled system of the monopile and vessel is ... -
Analysis of S–N data for new and corroded mooring chains at varying mean load levels using a hierarchical linear model
(Peer reviewed; Journal article, 2023)Results from full scale fatigue tests of offshore mooring chains are analyzed. The data set includes new and used chains, tested at a variety of mean load levels. The used chains have been retrieved after operation offshore ... -
Analytical gradient-based optimization of offshore wind turbine substructures under fatigue and extreme loads
(Journal article; Peer reviewed, 2016)Design optimization of offshore wind turbine support structures is an expensive task due to the highly-constrained, non-convex and non-linear nature of the design problem. A good depth of detail in the problem formulation ... -
Anisotropic fluid diffusion in carbon fiber reinforced composite rods: Experimental, analytical and numerical study
(Journal article; Peer reviewed, 2018)Carbon fiber composite plastic (CFRP) rods immersed in water present a pronounced anisotropic diffusion behavior. Understanding and predicting this behavior is important as the mechanical properties of the material are ... -
Application of Arbitrary Lagrangian-Eulerian Strips with Fully Nonlinear Wave Kinematics for Force Estimation
(Journal article; Peer reviewed, 2022)The initial design of offshore constructions generally uses a combination of model tests and second-order wave theory to reconstruct the wave kinematics to determine wave forces using the Morison equation. This routine ... -
Combined three-point bending and axial tension of pressurised and unpressurised X65 offshore steel pipes – Experiments and simulations
(Journal article; Peer reviewed, 2018)Subsea pipelines are occasionally struck and hooked by objects such as anchors or trawl gear. The initial denting, followed by potential hooking and displacement of the pipeline, give rise to a complex load and deformation ... -
Critical assessment of hydrodynamic load models for a monopile structure in finite water depth
(Peer reviewed; Journal article, 2020)The response from steep and breaking waves for a monopile structure is investigated by analysis of experimental results and by application of numerical models for six irregular sea states. The experimental monopile was ... -
Cyclic behavior and strain energy-based fatigue damage analysis of mooring chains high strength steel
(Peer reviewed; Journal article, 2020)This study investigates the low-cycle fatigue behavior of mooring chains high-strength steel grade R4 under different strain amplitudes and strain ratios at room temperature. A fatigue test program has been carried out on ... -
Design, Modelling and Analysis of a Large Floating Dock for Spar Floating Wind Turbine Installation
(Peer reviewed; Journal article, 2020)Installation of floating wind turbines at the offshore site is a challenging task. A significant part of the time efficiency and costs are related to the installation methods which are sensitive to weather conditions. This ... -
Design, structural modeling, control, and performance of 20 MW spar floating wind turbines
(Journal article; Peer reviewed, 2022)As floating wind turbines (FWTs) increase in size and power, the relative contribution of wave and wind loads to their global responses differs from what has been observed for 5–10 MW units. In addition, the larger deflections ...