해양관측용 부이의 설계 건전성 평가 - Part Ⅱ: 계류시스템 구조건전성 평가
Design of Oceanography Buoy - Part Ⅱ: Mooring System
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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
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
참고문헌 (8)
- 박한일, "한국 연근해 적용을 위한 해양 관측 부이의 특성 분석 연구", 한국해양환경공학회 2003년도 춘계학술대회 논문집, pp.267~273 (2003)
- 조규남, "해양 관측용 부이의 개념 설계 연구", 한국해양공학회지, 11(4), pp.205~212 (1997)
- Berteanx, H.O., "Buoy Engineering", pp.97~191 (1976)
- DNV, "Position Mooring, Offshore Standard DNVOS-E301", ~ (2004)
- Grosenbaugh, "Designing Oceanographic Surface Mooring to Withstand Fatigue", Journal of Atmospheric and Oceanic Technology, 12, pp.1101~1110 (1995)
- Grosenbaugh, "On the Dynamics of Oceanographic Surface Mooring", Ocean Engineering, 23, pp.7~25 (1996)
- National Data Buoy Center, "NDBC Mooring Design Manual", ~ (1989)
- Pierson, W.J., "A Proposed Spec-Tral form for Fully Developed Wind, Sea, Etc", Journal of Geophysical Research, 69, pp.5181~5190 (1964)