Design of Oceanography Buoy - Part II: Mooring System

J. Ocean Eng. Technol. 2009;23(1):89-95.

Keum Dong-Min,Kim Tae-Woo,Han Dae-Suk,Lee Won-Boo,Lee Jae-Myung

Dept. of Naval Architecture & Ocean Engineering Graduate School of Pusan National University,Dept. of Naval Architecture & Ocean Engineering Graduate School of Pusan National University,Dept. of Naval Architecture & Ocean Engineering Graduate School of

해양관측용 부이의 설계 건전성 평가 - Part II: 계류시스템 구조건전성 평가

금동민,김태우,한대석,이원부,이제명

부산대학교 조선해양공학과 대학원,부산대학교 조선해양공학과 대학원,부산대학교 조선해양공학과 대학원,신동 디지텍,부산대학교 조선해양공학과

Keywords: Oceanographic buoy, Ship shaped buoy, Inverse-catenary mooring system, Mooring tension, Extreme environment

핵심용어: 해양관측 부이, 선박형 부이, 역현수식 계류시스템, 계류삭 장력, 극한환경

Abstract

The purpose of the present study was to evaluate the safety under extreme environmental conditions and the dynamic safety under service environment conditions, of oceanographic buoy mooring systems consisting of a variety of materials, including chain, wire rope, nylon rope, and polypropylene rope. For the static safety assessment of a mooring system, after the calculation of external forces and the division of a mooring system into finite elements, the numerical integral was conducted to yield the elemental static tension until satisfying the geometrical convergence condition. To evaluate the dynamic safety, various processes were considered, including data collection about the anticipated areas for mooring, a determination of the parameters for the interpretation, the interpretation of the dynamic characteristics based on an analytic equation that takes into account the heave motion effect of a buoy hull and a mooring system, and a fatigue analysis of the linear cumulative damage. Based on the analysis results, a supplementary proposal for a wire rope that has a fracture in an actual mooring area was established.