모형빙 밀도 계측 방법 개선 연구

Abstract

The Korea Research Institute of Ships & Ocean Engineering (KRISO) has an ice tank to make a test environment similar to the real icein the polar sea in order to carry out model tests. One of the most important task of the ice tank is to generate the model ice to havesimilar material properties as sea ice. The primary properties of sea ice which influence the ice performance of ice breakers andice-strengthened vessels traveling in the polar sea are ice thickness, flexural strength, density, modulus of elasticity and crystalstructure etc. Among them, since the density of model ice influences the buoyance resistance of ice for the ship model, the accuratemeasurement of ice density should be used to obtain the accurate analysis results from the model test. In this paper, some existingmethods to measure the density of model ice are reviewed and a new one is proposed to measure it accurately and easily as possible. In this study, the measuring system including an UTM and several measuring devices was established to obtain the model ice density. Polyethylene and ice specimens are used for a series of repeatable measurement tests. From the results, it was recognized that bothof the displacement method and the weight/weight methods gave the stable and favorable tendency.