Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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A Study on the Riser Fatigue Analysis Using a Quarter-modal Spectrum

사봉형 스펙트럼을 이용한 라이저 피로해석 연구

  • Kim, Sang Woo (Division of Naval Architecture and Ocean Systems Engineering, Korea Maritime and Ocean University) ;
  • Lee, Seung Jae (Division of Naval Architecture and Ocean Systems Engineering, Korea Maritime and Ocean University) ;
  • Choi, Sol Mi (Division of Naval Architecture and Ocean Systems Engineering, Korea Maritime and Ocean University)
  • 김상우 (한국해양대학교 조선해양시스템공학부) ;
  • 이승재 (한국해양대학교 조선해양시스템공학부) ;
  • 최솔미 (한국해양대학교 조선해양시스템공학부)
  • Received : 2016.07.01
  • Accepted : 2016.11.08
  • Published : 2016.12.20
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Abstract

Oil and gas production riser systems need to be designed considering a wide band quarter-modal analysis which contains low-, wave-, VIV(Vortex induced vibration) frequencies. The VIV can be separated into cross-flow(CF) and in-line(IL) components. In this study, the various idealized tri- and quarter-modal spectra are suggested to analyze fatigue damage on the production riser system. In order to evaluate the fatigue damage increment caused by the IL's motion, tri- and quarter-modal spectral fatigue damages are calculated in time domain. And the fatigue damage calculated from two different modal spectra are compared quantitatively. Then the suitability of existent wide band fatigue damage models for quarter modal spectrum was evaluated by comparison of frequency domain calculation and time domain calculation. The result show that although spectral density of IL motion is not remarkable in quantity, the effect on the fatigue damage is significant and existent fatigue damage models are not adequately estimating damage by quarter-modal spectra.

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References

  1. ASTM E 1049-85, 1985. Standard Practices for Cycle Counting in Fatigue Analysis. American Society for Testing and Materials International.
  2. Baarholm, G.S. Larsen, C.M. & Lie, H., 2006. On Fatigue Damage Accumulation from In-line and Cross-flow Vortex-induced Vibrations on Risers. Journal of Fluids and Structures, 22, pp.109-127. https://doi.org/10.1016/j.jfluidstructs.2005.07.013
  3. Benasciutti, D. & Tovo, R., 2005. Spectral Methods for Life Time Prediction under Wide-band Stationary Random Processes. International Journal of fatigue, 27(8), pp.867-877. https://doi.org/10.1016/j.ijfatigue.2004.10.007
  4. Bendat, J.S., 1964. Probability Functions for Random Responses: Prediction for Peaks, Fatigue damage, and Catastrophic Failures. National Aeronautics and Space Administration report on contract NAS-5-4590, USA.
  5. Chen, Z.S. & Kim, W.J., 2010. Numerical Investigation of Vortex Shedding and Vortex-Induced Vibration for Flexible Riser Models. Journal of Naval Architecture and Ocean Engineering, 2, pp.112-118. https://doi.org/10.2478/IJNAOE-2013-0026
  6. Dirlik, T., 1985. Application of computers in fatigue. Ph.D Thesis. University of Warwick.
  7. DNV, 2010. Recommended Practice DNV-RP-F204 Riser Fatigue. Det Norske Veritas: Norway.
  8. Jiao, G. & Moan, T., 1990. Probabilistic Analysis of Fatigue due to Gaussian Load Processes. Probabilistic Engineering Mechanics, 5(2), pp.76-83. https://doi.org/10.1016/0266-8920(90)90010-H
  9. Kim, S.W. Lee, S.J. Park, C.Y. & Kang, D.H., 2016. An Experimental Study of a Circular Cylinder's Two-degree-of-freedom Motion Induced by Vortex. International Journal of Naval Architecture and Ocean Engineering, 8(4), pp.330-343. https://doi.org/10.1016/j.ijnaoe.2016.05.001
  10. Madsen, H.O. Krenk, S. & Lind, N.C., 1986. Methods of Structural Safety. Prentice-Hall, Englewood Cliffs: N.J.
  11. Matsuishi, M. & Endo, T., 1968. Fatigue of Metals Subjected to Varying Stress. Japan Society of Mechanical Engineers, Fukuoka, Japan, 68(2), pp.37-40.
  12. Miner, M.A., 1945. Cumulative Damage in Fatigue. Journal of Applied Mechanics, 12, pp.159-164.
  13. Park, J.B. & Chang, Y.S., 2015. Fatigue Damage Model Comparison with Formulated Tri-modal Spectrum Loadings under Stationary Gaussian Random Processes. Ocean Engineering, 105, pp.72-82. https://doi.org/10.1016/j.oceaneng.2015.05.039
  14. Park, J.B. Choung, J.M. & Kim, K.S., 2014. A New Fatigue Prediction Model for Marine Structures Subject to Wideband Stress Process. Ocean Engineering, 76, pp.144-151. https://doi.org/10.1016/j.oceaneng.2013.11.002
  15. Park, J.B. & Jeong, S.M., 2014. Fatigue Damage Model Comparison with Tri-modal Spectrum under Stationary Gaussian Random Processes. Journal of Ocean Engineering and Technology, 28(3), pp.185-192. https://doi.org/10.5574/KSOE.2014.28.3.185
  16. Park, J.B. Kim, K.S. Choung, J.M. Yoo, C.H. & Ha, Y.S., 2011. Data Acquisition of Time Series from Stationary Ergodic Random Process Spectrums. Journal of Ocean Engineering and Technology, 25, pp.120-126. https://doi.org/10.5574/KSOE.2011.25.2.120
  17. Trim, A.D. Braaten, H. Lie, H. & Tognarelli, M.A., 2005. Experimental Investigation of Vortex-induced Vibration of Long Marine Risers. Journal of Fluids and Structures, 21, pp.335-361. https://doi.org/10.1016/j.jfluidstructs.2005.07.014
  18. Vanmarcke, E.H., 1972. Properties of Spectral Moments with Applications to Random Vibration. Journal of the Engineering Mechanics Division, 98(2), 425-446.
  19. Wang, K. Tang, W. & Xue, H., 2015. Time Domain Approach for Coupled Cross-flow and In-line VIV Induced Fatigue Damage of Steel Catenary Riser at Touchdown zone. Marine Structures, 41, 267-287. https://doi.org/10.1016/j.marstruc.2015.02.004
  20. Wirsching, P. H. & Light, M. C., 1980. Fatigue under Wide Band Random Stresses. Journal of the Structural Division. American Society of Civil Engineers(ASCE), 106(7), pp.1593-1607.