Blar i SINTEF Open på tidsskrift "Ocean Engineering"
Viser treff 21-39 av 39
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Model-free anti-swing control of complex-shaped payload with offshore floating cranes and a large number of lift wires
(Peer reviewed; Journal article, 2021)Being one of the most commonly used offshore operations, offshore lifting operations become increasingly challenging due to the gradually growing size and weight of payloads. The research on automatic control in lifting ... -
Navigation vector based ship maneuvering prediction
(Journal article; Peer reviewed, 2017-07-17)A novel mathematical framework for predicting ship maneuvers within a short time interval is presented in this study. The first part of this study consists of estimating the required vessel states and parameters by considering ... -
Numerical benchmarking of fluid–structure interaction: An isogeometric finite element approach
(Journal article; Peer reviewed, 2016)In this paper we describe and evaluate an isogeometric finite element program, IFEM-FSI, for doing coupled fluid–structure interaction simulations. We investigate the role played by employing higher polynomial orders and ... -
Numerical prediction of ice rubble field loads on the Norströmsgrund lighthouse using cohesive element formulation
(Peer reviewed; Journal article, 2021)An attempt has been made to predict the ice rubble field load on Norströmsgrund lighthouse by using Cohesive Element (CE) formulation. Two sub-load events were selected to validate the numerical and material model used in ... -
Numerical study of closed rigid fish cages in waves and comparison with experimental data
(Peer reviewed; Journal article, 2021)Closed fish cages have gained increased interest in marine aquaculture. However, knowledge on the seakeeping behaviour of a floating closed cage and the influence of the contained water inside the cage are still limited. ... -
Operability analysis of control system for ROV launch-and-recovery from autonomous surface vessel
(Journal article; Peer reviewed, 2023)The launch and recovery of equipment such as remotely operated vehicles (ROVs) is a critical task that defines the operability limits of many marine operations. This paper considers the analysis of control systems that are ... -
Operability robustness index as seakeeping performance criterion for offshore vessels
(Journal article; Peer reviewed, 2020-12-01)The offshore industry operates increasingly large installations in exposed areas requiring high reliability and availability. Downtime of complex offshore systems leads to significant financial losses. Towards year-round ... -
Operation platform design for modular adaptable ships: Towards the configure-to-order strategy
(Journal article; Peer reviewed, 2018)Modular adaptable ships have received growing attention in recent decades as a promising approach to handling uncertainty in future operating contexts. A modular adaptable ship can be used for multiple purposes by changing ... -
Prediction of potential net panel selectivity in mesopelagic trawls
(Peer reviewed; Journal article, 2022)The growing interest in harvesting mesopelagic fish species has increased the need for knowledge about how trawls should be designed for optimizing the catch efficiency of these resources. Since the net herding efficiency ... -
Probabilistic fatigue model for design and life extension of mooring chains, including mean load and corrosion effects
(Peer reviewed; Journal article, 2022)A probabilistic model for mooring chain fatigue damage is developed based on the S–N approach. The effects of mean load and corrosion condition on the fatigue capacity of the chains are included by adopting a parameterized ... -
Reduction of the wave propagation error of a sigma grid based numerical tank using a vertical spacing based on the constant truncation error
(Peer reviewed; Journal article, 2021) -
Robust Dynamic Positioning of offshore vessels using mixed-μ synthesis modeling, design, and practice
(Journal article; Peer reviewed, 2017-01-31)This paper describes a procedure to design robust controllers for Dynamic Positioning (DP) of ships and offshore rigs subjected to the influence of sea waves, currents, and wind loads using H∞ and mixed-μ techniques. The ... -
Safe navigation in a coastal environment of multiple surface vehicles under uncertainties: A combined use of potential field constructions and NMPC
(Peer reviewed; Journal article, 2020)This paper deals with the motion planning problem for surface vehicles in the presence of varying environmental disturbances. The goal is to steer the vehicles from an initial to a final destination while ensuring connectivity ... -
Seepage effects on bedload sediment transport rate by random waves
(Journal article; Peer reviewed, 2014-05-15)The mean net bedload sediment transport rate beneath random waves is predicted taking into account the effect of seepage flow. This is achieved by using wave half-cycle bedload sediment transport formulas valid for regular ... -
Ship design for real sea states under uncertainty
(Peer reviewed; Journal article, 2022)A ship is designed under inescapable uncertainty. Neglecting important uncertainties might lead to suboptimal designs. Furthermore, to achieve the best possible performance, the ship design should be optimized for the ... -
Statistical modelling of extreme ocean current velocity profiles
(Journal article; Peer reviewed, 2019-08-15)Knowledge about extreme ocean currents and their vertical structure is important when designing offshore structures. We propose a method for statistical modelling of extreme vertical current velocity profiles, accounting ... -
Suspended sediments due to random waves including effects of second order wave asymmetry and boundary layer streaming
(Journal article; Peer reviewed, 2015-08)The paper provides a practical stochastic method by which the suspended sediment concentration due to long-crested (2D) and short-crested (3D) nonlinear random waves can be calculated. The approach is based on assuming the ... -
Testing the robustness of optimal access vessel fleet selection for operation and maintenance of offshore wind farms
(Journal article; Peer reviewed, 2017-11-15)Optimising the operation and maintenance (O&M) and logistics strategy of offshore wind farms implies the decision problem of selecting the vessel fleet for O&M. Different strategic decision support tools can be applied to ... -
Uncertainty analysis of the hydrodynamic coefficients estimation of a nonlinear manoeuvring model based on planar motion mechanism tests
(Journal article; Peer reviewed, 2019-02-01)Uncertainty analysis of the identified hydrodynamic coefficients of a nonlinear manoeuvring model is presented in this paper. The classical parameter estimation method, Least Square, is briefly introduced, and the uncertainty ...