EPP적용 LL-24형 경량화 등부표의 운동 안정성 평가

Abstract

Light buoys are equipped with lighting functions and a kind of navigation signs. By its shape and colors, the buoys show the route to vessels sailing nearby in the daytime, while by its lighting at night. It also plays a role in notifying the presence of obstacles such as reefs and shallows. Because the large buoy is mainly made of steel, it is vulnerable to the water and hard to handle for installation and maintenance. Moreover, the accidents of vessels’ collision with the buoys and damages of the vessels due to the material of the buoys, say steel, have been reported every year in Korea. In the this study, the newly developed lightweight light-buoys, combined with 7 nautical mile self-contained lantern, are introduced. To reduce the total weight, EPP(Expanded polypropylene) and aluminum are applied for the flotation section and tower structures, respectively. The new self-contained light system, whose weight is 10% of conventional power-separated light system, is adopting solar cells, high performance batteries, LED light emitters and so on. Hydrostatic calculations and motion analysis of the buoy in waves are carried out to find the optimum drafts and stabilizing weight since there is a mandatory regulation for the motion of the buoys.