Hydroelastic Analysis of a Very Large Floating Structure in Waves

摘要

In this paper, hydroelastic respones of the very large floating structure are studied based on linear potential theory. A theoretical method is developed to analyze the hydroelastic responses of very large floating structure(VLFS) using pressure distribution method and modal expansions of structural motion. The singularities are distributed over the structure of a zero draft plate on the free surface and hydrodynamic pressures are evaluated. The integral equation is formulated by the Green function in case of finite water depth. The deflections of structure are approximated by an modal expansion in terms of natural mode functions of free-free beam. The effects of water depth, bending rigidity, relative length of regular waves, and directions of waves on the response of hydrodynamic pressure and deformation of structure are examined. The calculated items are pressure distributions, vertical motions and bending moments over a mat. The calculated results for thin plate of a pontoon type are compared with the experimental ones.