Blar i Institutt for marin teknikk på tidsskrift "Applied Ocean Research"
Viser treff 41-59 av 59
-
Numerical modeling of perforated plates in oscillating flow
(Journal article; Peer reviewed, 2019)Perforated plates, relevant for several marine applications, are experimentally and numerically investigated. The numerical investigations are performed using a presently developed Navier–Stokes solver. Several comparison ... -
Parameterised transfer functions with associated confidence bands
(Peer reviewed; Journal article, 2022)This paper presents a method that can be used to obtain the motion transfer functions of a ship when the detailed hull geometry is not available. In the method, any parameterised transfer function can be optimised from a ... -
Preliminary assessment of increased main engine load as a consequence of added wave resistance in the light of minimum propulsion power
(Journal article; Peer reviewed, 2021)This paper addresses the connection between added wave resistance and required propulsion power of ships, having focus on the early stage of new ship designs, notably tankers and bulk carriers. The paper investigates how ... -
A Probabilistic Framework for the Fatigue Damage Assessment of Ships Navigating through Level Ice Fields
(Journal article, 2021)For ships navigating in ice-covered waters, fatigue damage due to ice loads is an important issue. The purpose of this paper is to provide ship researchers and engineers with a simulation-based procedure for a probabilistic ... -
Reliability analysis of wake-induced collision of flexible risers
(Journal article; Peer reviewed, 2017)Collision between risers is an important design and operational concern, especially in deep water since the probability of collision tends to increase as the riser length increases. Riser collision is due to the joint ... -
Sea state estimation using multiple ships simultaneously as sailing wave buoys
(Journal article; Peer reviewed, 2019)The article presents initial ideas towards a network-based approach for sea state estimation used for marine operations and other maritime applications. In principle, all available means, ranging from in situ buoys, fleet ... -
Sea state estimation using vessel response in dynamic positioning
(Journal article; Peer reviewed, 2018)This paper presents a novel method for estimating the sea state parameters based on the heave, roll and pitch response of a vessel conducting station keeping automatically by a dynamic positioning (DP) system, i.e., without ... -
Simulating fundamental and higher harmonic VIV of slender structures
(Journal article; Peer reviewed, 2019)Vortex-induced vibrations (VIV) of slender marine structures are complicated response processes, where a number of distinct frequency components might be simultaneously active. These are categorized as fundamental and ... -
Simultaneous sea state estimation and transfer function tuning using a network of dynamically positioned ships
(Peer reviewed; Journal article, 2022)This paper presents a study focused on wave spectrum estimation in practical scenarios where multiple ships operate in the same geographical area, potentially forming a network of wave recorders. A novel methodology is ... -
Sloshing-induced motions of a spar inside a cylindrical dock with baffles in waves
(Peer reviewed; Journal article, 2023)The motions of a free floating offshore wind turbine’s (OWT) spar-type platform inside a bottom-less moored cylindrical dock are investigated for incident wave frequencies near the first lateral sloshing resonance, focusing ... -
Statistical modeling of Ship’s hydrodynamic performance indicator
(Peer reviewed; Journal article, 2021)The traditional method used to estimate the hydrodynamic performance of a ship uses either the model test results or one of the many empirical methods to estimate and observe the trend in fouling friction coefficient () ... -
Stochastic bivariate time series models of waves in the North Sea and their application in simulation-based design
(Journal article; Peer reviewed, 2019)In this paper, we present and evaluate three long-term wave models for application in simulation-based design of ships and marine structures. Designers and researchers often rely on historical weather data as a source for ... -
Time domain simulation of marine riser vortex-induced vibrations in three-dimensional currents
(Peer reviewed; Journal article, 2022)One of the major uncertainties related to present Vortex-Induced Vibrations (VIV) prediction practice is related to the simplification of real multi-directional current profiles into equivalent uni-directional ones. This ... -
Truncated least square support vector machine for parameter estimation of a nonlinear manoeuvring model based on PMM tests
(Journal article; Peer reviewed, 2020)A new version of least square support vector machine (LS-SVM), the truncated LS-SVM, is proposed to estimate the nondimensionalized hydrodynamic coefficients. Truncated LS-SVM is shown to be an efficient and robust method ... -
Two-dimensional experimental and numerical investigations of parallel perforated plates in oscillating and orbital flows
(Peer reviewed; Journal article, 2020)The hydrodynamic loads on two-dimensional perforated plates are investigated experimentally and numerically. Two parallel plate configurations, consisting of an upper perforated plate and a lower perforated plate, are ... -
Two-dimensional experimental and numerical investigations of perforated plates in oscillating flow, orbital flow and incident waves
(Peer reviewed; Journal article, 2020)The hydrodynamic loads on two-dimensional perforated plates are investigated experimentally and numerically. Two single perforated plate configurations, consisting of rows of either circular or square cylinders, are studied. ... -
Uncertainty of full-scale manoeuvring trial results estimated using a simulation model
(Journal article; Peer reviewed, 2017)This paper describes how to estimate the uncertainty of manoeuvring sea trial results without performing repeated tests using only a simulation model. The approach is based on the Monte Carlo method of uncertainty propagation. ... -
An upright bottomless vertical cylinder with baffles floating in waves
(Peer reviewed; Journal article, 2022)Damping of the surge and pitch motions, as well as the first lateral sloshing mode in a rigid free-floating upright circular dock with bilge boxes and open bottom is investigated. Model tests are carried out on a 0.80 m ... -
Validation of ship manoeuvring models using metamodels
(Journal article; Peer reviewed, 2017)This paper describes how simplified auxiliary models—metamodels—can be used to create benchmarks for validating ship manoeuvring simulation models. A metamodel represents ship performance for a limited range of parameters, ...