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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Ocean Systems Engineering
Journal Basic Information
Journal DOI :
Editor in Chief :
Young S. Shin
Volume & Issues
Volume 1, Issue 4 - Dec 2011
Volume 1, Issue 3 - Sep 2011
Volume 1, Issue 2 - Jun 2011
Volume 1, Issue 1 - Mar 2011
Selecting the target year
The calibration of a laser profiling system for seafloor micro-topography measurements
Loeffler, Kathryn R. ; Chotiros, Nicholas P. ;
Ocean Systems Engineering, volume 1, issue 3, 2011, Pages 195~205
DOI : 10.12989/ose.2011.1.3.195
A method for calibrating a laser profiling system for seafloor micro-topography measurements is described. The system consists of a digital camera and an arrangement of six red lasers that are mounted as a unit on a remotely operated vehicle (ROV). The lasers project as parallel planes onto the seafloor, creating profiles of the local topography that are interpreted from the digital camera image. The goal of the calibration was to determine the plane equations for the six lasers relative to the camera. This was accomplished in two stages. First, distortions in the digital image were corrected using an interpolation method based on a virtual pinhole camera model. Then, the laser planes were determined according to their intersections with a calibration target. The position and orientation of the target were obtained by a registration process. The selection of the target shape and size was found to be critical to a successful calibration at sea, due to the limitations in the manoeuvrability of the ROV.
Simulation of free falling rigid body into water by a stabilized incompressible SPH method
Aly, Abdelraheem M. ; Asai, Mitsuteru ; Sonoda, Yoshimi ;
Ocean Systems Engineering, volume 1, issue 3, 2011, Pages 207~222
DOI : 10.12989/ose.2011.1.3.207
A stabilized incompressible smoothed particles hydrodynamics (ISPH) method is utilized to simulate free falling rigid body into water domain. Both of rigid body and fluid domain are modeled by SPH formulation. The proposed source term in the pressure Poisson equation contains two terms; divergence of velocity and density invariance. The density invariance term is multiplied by a relaxed parameter for stabilization. In addition, large eddy simulation with Smagorinsky model has been introduced to include the eddy viscosity effect. The improved method is applied to simulate both of free falling vessels with different materials and water entry-exit of horizontal circular cylinder. The applicability and efficiency of improved method is tested by the comparisons with reference experimental results.
FEA of the blast loading effect on ships hull
Hamdoon, Muhsin ; Zamani, Nader ; Das, Sreekanta ;
Ocean Systems Engineering, volume 1, issue 3, 2011, Pages 223~239
DOI : 10.12989/ose.2011.1.3.223
In combat operations, naval ships may be subjected to considerable air blast and underwater shock loads capable of causing severe structural damage. As the experimental study imposes great monetary and time cost, the numerical solution may provide a valuable alternative. This study emphasises on numerical analysis for optimization of stiffened and unstiffened plate`s structural response subjected to air blast load. Linear and non linear finite element (FE) modeling and analysis was carried out and compared with existing experimental results. The obtained results reveal a good agreement between numerical and experimental observations. The presented FE models can eliminate confusion regarding parameters selection and FE operations processing, using commercial software available currently.
Discussion on "Rotor-floater-mooring coupled dynamic analysis of mono-column-TLP-type FOWT (Floating Offshore Wind Turbine)"
Bae, Y.H. ; Kim, M.H. ;
Ocean Systems Engineering, volume 1, issue 3, 2011, Pages 243~248
DOI : 10.12989/ose.2011.1.3.243
Nonlinear ship rolling motion subjected to noise excitation
Jamnongpipatkul, Arada ; Su, Zhiyong ; Falzarano, Jeffrey M. ;
Ocean Systems Engineering, volume 1, issue 3, 2011, Pages 249~261
DOI : 10.12989/ose.2011.1.3.249
The stochastic nonlinear dynamic behavior and probability density function of ship rolling are studied using the nonlinear dynamical systems approach and probability theory. The probability density function of the rolling response is evaluated through solving the Fokker Planck Equation using the path integral method based on a Gauss-Legendre interpolation scheme. The time-dependent probability of ship rolling restricted to within the safe domain is provided and capsizing is investigated from the probability point of view. The random differential equation of ships` rolling motion is established considering the nonlinear damping, nonlinear restoring moment, white noise and colored noise wave excitation.