Results 181 to 190 of about 5,053 (208)
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Automated processing of free roll decay experimental data
Ocean Engineering, 2015This work presents an efficient numerical and modular approach to assessing viscous roll damping coefficients from free decay tests. In order to reduce the time consumed during analysis, numerical pre-processing of the data without visual inspection is suggested. The method involves breaking down multiple decay motions recorded in a single time series,
Emre Uzunoglu
exaly +2 more sources
Numerical simulations of free roll decay of DTMB 5415
Ocean Engineering, 2018Abstract Computational fluid dynamics (CFD) that implement finite volume method are offering accurate and precise solutions for ship roll problem. In this study, the free roll decay of the benchmark DTMB 5415 hull with bilge keels in calm water was numerically solved by applying this type of code.
Ömer Kemal Kinaci, Metin Kemal Gökçe
exaly +3 more sources
Ocean Engineering, 2020
Abstract Experimental and numerical studies were performed to estimate roll damping and hydrodynamic pressure on a 2-D rectangular structure. Free roll decay test was simulated by experiment in 2-D wave tank with Particle Image Velocimetry (PIV) measurement, and by numerical simulations using CFD based on an unsteady incompressible Reynolds-Averaged ...
Tien Trung Duong +2 more
exaly +2 more sources
Abstract Experimental and numerical studies were performed to estimate roll damping and hydrodynamic pressure on a 2-D rectangular structure. Free roll decay test was simulated by experiment in 2-D wave tank with Particle Image Velocimetry (PIV) measurement, and by numerical simulations using CFD based on an unsteady incompressible Reynolds-Averaged ...
Tien Trung Duong +2 more
exaly +2 more sources
A Study of the Roll Motion by Means of a Free Decay Test
Journal of Offshore Mechanics and Arctic Engineering, 2010In this study, a method for the extraction of damping by tracing free roll decay is presented. For this purpose, in calm waters, a bulk carrier model is given a large initial roll angle and then released. Consequently, the roll motion is recorded.
Hamid Zeraatgar +2 more
exaly +2 more sources
Applied Ocean Research, 2020
Abstract The previous study of Fernandes et al. [1] showed that rather than a fixed rotation center, the phenomenology can be better represented by the concept of a MOIRC. This study contributes to understanding Instantaneous Rotation Centers (IRC) and Most Often Instantaneous Rotation Centers (MOIRC) behavior during the free roll decay tests of a ...
Antonio CARLOS Fernandes, Peyman Asgari
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Abstract The previous study of Fernandes et al. [1] showed that rather than a fixed rotation center, the phenomenology can be better represented by the concept of a MOIRC. This study contributes to understanding Instantaneous Rotation Centers (IRC) and Most Often Instantaneous Rotation Centers (MOIRC) behavior during the free roll decay tests of a ...
Antonio CARLOS Fernandes, Peyman Asgari
exaly +2 more sources
Application of wavelet transforms to the decoupling of free-roll decay data
Ocean Engineering, 2003This study presents the results of the decoupling of a free-roll decay test by wavelet transforms. A free-roll decay test was performed to determine the coefficients of damping terms in equations of motion. No motion of the model was restricted during the experiment. A slight yaw motion was found while the model was in the free-roll decay motion.
S H Kwon
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Journal of Ocean University of China, 2019
Damping is critical for the roll motion response of a ship in waves. A common method for the assessment of damping in a ship’s rolling motion is to perform a free-decay experiment in calm water. In this paper, we propose an approach for estimating nonlinear damping that involves a linear exponential analytical approximation of the experimental roll ...
Shao Meng
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Damping is critical for the roll motion response of a ship in waves. A common method for the assessment of damping in a ship’s rolling motion is to perform a free-decay experiment in calm water. In this paper, we propose an approach for estimating nonlinear damping that involves a linear exponential analytical approximation of the experimental roll ...
Shao Meng
exaly +2 more sources
Ocean Engineering, 2010
Abstract The purpose of this paper is to identify the functional form of the nonlinear roll damping for a particular ship based on an experiment. The problem of damping identification is formulated as an integral equation of the first kind. However, the solution of the problem lacks stability properties, due to the ill-posedness of the first-kind ...
S H Kwon, T S Jang
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Abstract The purpose of this paper is to identify the functional form of the nonlinear roll damping for a particular ship based on an experiment. The problem of damping identification is formulated as an integral equation of the first kind. However, the solution of the problem lacks stability properties, due to the ill-posedness of the first-kind ...
S H Kwon, T S Jang
exaly +2 more sources
Free roll decay modeling of a trimaran based on least square support vector machine
2012 Oceans, 2012A trimaran is a multihulled boat consisting of a main hull and two smaller outrigger hulls, attached to the main hull with lateral struts. There have been many studies highlighting that a trimaran takes many advantages over other types of hulls especially the roll performance, because of the greater resistance to rolling that the outrigger hulls offer.
Shuo Pang, Jinlong Li
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Formulation of ship roll damping models from free-decay data
Ocean Engineering, 2023Dong Zhang, Wei Liu
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