Blar i Institutt for marin teknikk på tidsskrift "Applied Ocean Research"
Viser treff 21-40 av 59
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Efficient computation of cross-spectral densities in the stochastic modelling of waves and wave loads
(Journal article; Peer reviewed, 2017)A new method is presented for efficient calculation of auto- and cross-spectral densities in the stochastic modelling of ocean waves and wave loads. As part of the short-term response analyses, the method may contribute ... -
Empirical estimation of low-frequency nonlinear hydrodynamic loads on moored structures
(Peer reviewed; Journal article, 2021)Low-frequency (LF) motions of floating structures are commonly modeled as the response of an oscillator to a second-order wave excitation. We present here an empirical method that reliably estimates the oscillators parameters ... -
Experimental analysis on the risk of vortex ventilation and the free surface ventilation of marine propellers
(Journal article; Peer reviewed, 2017)The paper presents a discussion of the ventilation inception and air drawing prediction of ships propellers, aiming to predict under what conditions ventilation will happen, and the actual physical mechanism of the ... -
Experimental and numerical investigation of a freefall wedge vertically entering the water surface
(Journal article; Peer reviewed, 2015)Experiments and numerical methods are developed to investigate the water entry of a freefall wedge with a focus on the evolution of the pressure on the impact sides (the side contacting water) and the top side (the dry ... -
Experimental and numerical investigations of monopile ringing in irregular finite-depth water waves
(Journal article; Peer reviewed, 2017)In storm conditions, nonlinear wave loads on monopile offshore wind turbines can induce resonant ringing-type responses. Efficient, validated methods which capture such events in irregular waves in intermediate or shallow ... -
Experimental measurements of propulsive factors in following and head waves
(Peer reviewed; Journal article, 2021)The results from resistance measurements in calm water and load-varying self-propulsion tests in calm water and regular head and following waves are presented. The experimental campaign is conducted in the large towing ... -
Experimental studies of a damaged ship section in beam sea waves
(Journal article; Peer reviewed, 2020)This work presents a series of experiments performed with a prismatic hull form in a small wave flume. The model is a midship section with rectangular damage opening on the side. It is slightly smaller than the flume breadth ... -
Experimental studies of a damaged ship section in forced heave motion
(Journal article; Peer reviewed, 2019)This work documents a detailed series of experiments performed in a wave flume on a thin walled prismatic hull form. The model consists of a rectangular opening located on the side. The length of the model is slightly ... -
Experimental Study on the Drag Forces on a Twin-tube Submerged Floating Tunnel Segment Model in Current
(Journal article; Peer reviewed, 2020)In this paper, the drag forces on a rigid segment of a twin-tube submerged floating tunnel (SFT) under various Re number and submergence are experimentally investigated with a simplified rigidly connected tandem twin-cylinder ... -
Extensive hydro-elastic floating bridge tests: Planning, design, implementation, and numerical comparison
(Peer reviewed; Journal article, 2023)Extensive hydrodynamic and hydro-elastic tests for a long floating bridge have been carried out in the ocean basin of SINTEF Ocean for the Bjørnafjord floating bridge project. The complexity of the floating bridge plus ... -
Fuel savings for a general cargo ship employing retractable bow foils
(Journal article, 2018)Route simulations were performed on a 100 m long (between perpendiculars) general cargo ship equipped with retractable bow-mounted foils, so-called wavefoils, for resistance reduction and motion damping in waves. Two ... -
Global sensitivity analysis and repeated identification of a modular maneuvering model of a passenger ferry
(Journal article; Peer reviewed, 2018)In the paper a modular manoeuvring model of the passenger ferry “Landegode” is built, validated and studied. Global sensitivity analysis based on the variance decomposition is performed to assess the sensitivity of the ... -
The importance of the engine-propeller model accuracy on the performance prediction of a marine propulsion system in the presence of waves
(Peer reviewed; Journal article, 2020)The shipping industry is the heart of international trading activities and the global economy. Maritime transport contributes to environmental pollution through the emission of greenhouse gases. New mandatory regulations ... -
In situ coastal observations of wave homogeneity and coherence
(Peer reviewed; Journal article, 2022)A better understanding of wave homogeneity, i.e. the spatial variations of the wave characteristics, and wave coherence in coastal areas and fjords is essential for the design and analysis of sea-crossing infrastructures, ... -
Influence of yaw-roll coupling on the behavior of a FPSO: An experimental and numerical investigation
(Journal article; Peer reviewed, 2015)An inconvenience in the experimental set-up of a FPSO in regular waves highlighted occurrence of parametric-roll events promoted by yaw-roll coupling and motivated a combined physical and numerical analysis on the relevance ... -
Investigation of moonpools as pitch motion reducing device
(Peer reviewed; Journal article, 2021)Moonpools as a device for reducing pitch motion is investigated experimentally, numerically and by an approximate theory. A two-dimensional study is carried out of a rectangular body with two moonpools. Forced heave and ... -
Mechanical analysis of drilling riser based on pipe-in-pipe model
(Journal article, 2021)Due to the presence of a drill string inside drilling risers, the mechanical analysis becomes somewhat challenging which has attracted attention from design engineers and drilling operators. The purpose of this study is ... -
Model uncertainty assessment for wave- and current-induced global response of a curved floating pontoon bridge
(Peer reviewed; Journal article, 2020)The present paper provides a comparison between the numerical and experimental response for a generic floating pontoon bridge structure, thereby also serving to quantify the inherent uncertainties associated with both types ... -
New risk control mechanism for innovative deepwater artificial seabed system through online risk monitoring system
(Journal article, 2020)The current offshore field development concepts (dry tree or subsea tree) have limitations for petroleum production in ultra-deep water (more than 1500 m), where the challenges are characterized by the depth of water, ... -
Numerical and Experimental Study on the Parametric Roll Resonance for a Fishing Vessel with and without forward speed
(Peer reviewed; Journal article, 2020)The parametric resonance in roll motion (known shortly as parametric roll) was studied for a fishing vessel in regular waves. This is an instability and resonance phenomenon that can lead the roll to reach very high ...