In the paper, a prediction method for the nonlinear wave loads of a ship advancing in oblique waves with infinite water depth is proposed. Because of the good development in the hydrodynamics, the corresponding hydrodynamic coefficients and forces on ships can be well estimated. With this good basis, the authors consider the ship as a free-free beam and use the simple beam theory to estimate the corresponding sea loads along the ship hull, i.e., the wave bending moment, shear force and torsion moment at any ship section. Based on the well developed linear theory, an analytical model of the nonlinear wave loads for a ship in large oblique waves is further constructed. Time domain analyses, including the instant grid generation technique (IGGT), for the corresponding sea loads are performed. Furthermore, to avoid the numerical drift phenomena in the sway and yaw mode motions, the Artificial Restoring Force Technique(ARFT) and Digital Filter Technique(DFT) are applied to solve five coupled equations of motion. A series of analyses is performed in this paper, and some valuable suggestions are also submitted. The calculation procedures developed here may be considered as an efficient analytical tool for researchers to predict the ship motions and wave induced loads.
|Number of pages||12|
|Journal||Proceedings of the National Science Council, Republic of China, Part A: Physical Science and Engineering|
|Publication status||Published - 1997 Sep 1|
All Science Journal Classification (ASJC) codes