부유체 대표 평균 위치를 적용한 계류 라인의 시간 영역 피로 해석 효율화에 대한 연구
Study on Efficient Time Domain Fatigue Analysis of Mooring Chain by Representative Mean Position
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This paper addresses the concept of the representative mean position, which was devised to improve the numerical efficiency of a time domain fatigue analysis of a mooring chain. To investigate the influence of an artificial offset of the floater on the fatigue of the mooring chain, a parametric study was performed on the moored FPSO under various combinations of offsets and environmental conditions. Tension time histories were calculated using the de-coupled analysis method, and fatigue damages were calculated to determine the influence of the offset. The parametric study was extended to a more realistic case to determine the actual effect of the representative mean position, where a comparison was made between the two different analysis results, one using the representative mean position and the other one using the actual mean position. It was confirmed that the application of the representative mean position guaranteed the conservatism of the fatigue damage with the enhanced numerical efficiency in the time domain fatigue analysis.
Abstract
This paper addresses the concept of the representative mean position, which was devised to improve the numerical efficiency of a time domain fatigue analysis of a mooring chain. To investigate the influence of an artificial offset of the floater on the fatigue of the mooring chain, a parametric study was performed on the moored FPSO under various combinations of offsets and environmental conditions. Tension time histories were calculated using the de-coupled analysis method, and fatigue damages were calculated to determine the influence of the offset. The parametric study was extended to a more realistic case to determine the actual effect of the representative mean position, where a comparison was made between the two different analysis results, one using the representative mean position and the other one using the actual mean position. It was confirmed that the application of the representative mean position guaranteed the conservatism of the fatigue damage with the enhanced numerical efficiency in the time domain fatigue analysis.
참고문헌 (8)
- Bureau Veritas, "ARIANE7 Theoretical Manual" (2012)
- Det Norske Veritas(DNV), "Position Mooring, DNV-OS-E301", ~ (2010)
- Harald, O., "Coupled Analysis of Offshore Floating Systems", WIT Transactions on State of the Art in Science and Engineering, pp.18~ (2005)
- Harald, O., "Efficient Analysis of Mooring Systems using de-coupled and Coupled Analysis. OMAE98-0351", ~ (1998)
- Kang, C., "Fatigue Analysis of Spread Mooring Line", International Journal of Geological and Environmental Engineering, 10(5), pp.505~510 (2016)
- Kim, Y, "A Practical Procedure for Prediction of Extreme Loads on Offshore Mooring Lines", 36th Hydro-Seminar (2017), Osaka University
- Low, Y.M., "A Hybrid Time", Frequency Domain Approach for Efficient Coupled Analysis of Vessel, Riser Dynamics, pp.Ocean Engineering, 2008[DOI]
- Low, Y.M., "Extending a Time", Frequency Domain Hybrid Method for Riser Fatigue Analysis, 2011, pp.33, 793~803