부유식 해양플랜트 다점 계류라인의 피로손상모델 비교
Comparison of Fatigue Damage Models of Spread Mooring Line for Floating Type Offshore Plant
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초록
The mooring lines of a floating type offshore plant are known to show wide banded and bimodal responses. These phenomena come from a combination of low and high frequency random load components, which are derived from the drift‐restoring motion characteristic and wind‐sea, respectively. In this study, fatigue models were applied to predict the fatigue damage of mooring lines under those loads, and the result were compared. For this purpose, seven different fatigue damage prediction models were reviewed, including mathematical formula. A FPSO (floating,production, storage, and offloading) with a 4 x 4 spread catenary mooring system was selected as a numerical model, which was already installed at an offshore area of West Africa. Four load cases with different combinations of wave and wind spectra were considered, and the fatigue damage to each mooring line was estimated. The rain flow fatigue damage for the time process of the mooring tension response was compared with the results estimated by all the fatigue damage prediction models. The results showed that both Benasciutti‐Tovo and JB models could most accurately predict wide banded bimodal fatigue damage to a mooring system.
Abstract
The mooring lines of a floating type offshore plant are known to show wide banded and bimodal responses. These phenomena come from a combination of low and high frequency random load components, which are derived from the drift‐restoring motion characteristic and wind‐sea, respectively. In this study, fatigue models were applied to predict the fatigue damage of mooring lines under those loads, and the result were compared. For this purpose, seven different fatigue damage prediction models were reviewed, including mathematical formula. A FPSO (floating,production, storage, and offloading) with a 4 x 4 spread catenary mooring system was selected as a numerical model, which was already installed at an offshore area of West Africa. Four load cases with different combinations of wave and wind spectra were considered, and the fatigue damage to each mooring line was estimated. The rain flow fatigue damage for the time process of the mooring tension response was compared with the results estimated by all the fatigue damage prediction models. The results showed that both Benasciutti‐Tovo and JB models could most accurately predict wide banded bimodal fatigue damage to a mooring system.
참고문헌 (18)
- ABS, "Spectral-based Fatigue Analysis for Floationg Production, Storage and Offloading (FPSO) Systems", American Bureau of Shipping, ~ (2006)
- American Petroleum Institute(API), "Recommended Practice 3rd Edition 2SK Design and Analysis of Stationkeeping Systems for Floating Structures" (2005), API
- Benasciutti, D., "Spectral Methods for Lifetime Prediction under Wide-band Stationary Random Processes", International Journal of Fatigue, 27(8), pp.867~877 (2005)
- BV, "Ariane7 User Guide" (2008), Bureau Veritas
- French Dirlik T., "Application of Computers in Fatigue. PhD Thesis", 박사, pp.1985
- DNV, "Fatigue Assessment of Ship Structures", DNV Classification Notes No.30.7, Det Norske Veritas, ~ (2008)
- Jiao, G., "Probabilistic Analysis of Fatigue due to Gaussian Load Processes", Probabilistic Engineering Mechanics, 5(2), pp.76~83 (1990)
- KR, "Guidance for the Fatigue Strength Assessment of Ship Structures", Rules for Classification of Steel Ships, Korean Resister of Shipping, ~ (2010)
- 임유창, "바이모달 스펙트럼 특성을 가지는 정상확률과정에 대한 다점계류라인의 피로손상도 조합기법 연구", 대한조선학회 논문집, 47(6), pp.813~820 (2010), 대한조선학회
- Lloyd, "Fatigue Design Assessment, Level 3 Guidance on Direct Calculations" (2002), Lloyd’s Register
- Madsen H. O., "Methods of Structural Safety" (1986), Prentice-Hall
- Matsuishi, M., "Fatigue of Metals Subjected to Varying Stress-fatigue Lives under Random Loading", pp.37~40 (1968), Society of Mechanical Engineers
- Miner M. A., "Cumulative Damage in Fatigue", Journal of Applied Mechanics, 12, pp.159~164 (1945)
- Park, J. B., "The Development of a Fatigue Damage Model for the Wide Band Random Loading", 박사, pp.2011
- 박준범, "정상 에르고드성을 가지는 확률과정 스펙트럼에 대한 합리적 시계열 데이터 확보", 한국해양공학회지, 25(2), pp.120~126 (2011), 한국해양공학회
- Sakai, S., "On the Distribution of Rainflow Range for Gaussian Random Processes with Bimodal PSD", Japan Society of Mechanical Engineers International Journal Series A : Mechanics and Material Engineering, 38(4), pp.440~445 (1995)
- Wirsching, P. H., "Fatigue under Wide Band Random Stresses. Journal of the Structural Division", ASCE(American Society of Civil Engineers), 106(7), pp.1593~1607 (1980)
- Zhao, W., "On the Probability Density Function of Rain-flow Stress Range for Stationary Gaussian Processes", International Journal of Fatigue, 14(2), pp.121~135 (1992)