Effects of Radiation and Wave Excitation Forces Acting on an Icebreaker on Ship Motions and Structural Damages during Iceberg Collision

초록

Objective of this paper is to investigate the effects of hydrodynamic forces composed of radiation and wave excitation on the ship motion and structural damage under the ship-to-iceberg impacts. A user-defined subroutine for Abaqus, known as HydroQus, was developed to simulate fluid-structure interactions (FSIs) between an icebreaker ARAON and spherical shape iceberg. Hydrodynamic frequency response analyses of the ARAON were conducted to obtain restoring stiffness, RAOs of radiation force and 1st order wave excitation force. Heave, and pitch periods using HydroQus were coincident with those based on the motion RAOs. Because there was a high agreement in the natural periods, a series of case studies for the ARAON-iceberg collision were conducted considering the hydrodynamic effects as well as the elastic-plastic deformation. From this case study, the hydrodynamic forces had a large influence on the ship motion, while a relatively small impact on the structural damages. © 2022, International Association for Hydro-Environment Engineering and Research. All rights reserved.