Study On Hydroelastic Response Of Ice Floe Under The Action Of Waves

The marginal ice zone(MIZ)consisting of different shapes ice floes is the transition between the open ocean and sea ice,which has an important effect on navigation and the construction of offshore structures in ice-infested seas.This paper will study the hydroelastic response of ice floe under the action of waves in the marginal ice zone.In the paper,the hydroelastic response problem of ice floe under the action of waves is divided into structural motion part and fluid motion part.For the structural motion part,the Mindlin plate is used to simulate the ice floe;for the fluid part,the three-dimensional linear potential flow theory is used to establish the fluid motion model;the finite element-boundary element mixing method and the modal superposition method are used to solve the fluid-solid coupling equation of the ice floe in the waves.Based on the theories above,the hydroelastic response program of ice floe under regular waves is written,and the influence of the size of ice floe and the properties of incident waves on the hydroelastic response are studied,it is found that the vertical displacement of the ice floe decreases as the thickness of the ice floe increases;when the wave is incident positively,the vertical displacement of the ice floe increases as the wavelength increases.Then,combined with the virtual excitation method and the FEM-BEM hybrid method,a method for quickly analyzing the stationary random response of ice floe under irregular waves is proposed.Through this method,the effect of ice floe size on the vertical displacement is studied,and the breaking probability of ice floe is analyzed,it is found that under the action of irregular waves,the probability of breakage of ice floe decreases nonlinearly with the increase of fracture stress;when the fracture stress of the ice floe is constant,the significant wave height of irregular waves increases,and the probability of breakage of ice floe increases nonlinearly.