Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Fatigue Damage Model Comparison with Tri-modal Spectrum under Stationary Gaussian Random Processes

정상 정규분포 확률과정의 삼봉형 스펙트럼에 대한 피로손상 모델 비교

  • 박준범 (로이드 선급협회 아시아) ;
  • 정세민 (대우조선해양(주) 중앙연구원)
  • Received : 2014.02.14
  • Accepted : 2014.06.17
  • Published : 2014.06.30
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Abstract

The riser systems for floating offshore structures are known to experience tri-modal dynamic responses. These are owing to the combined loadings from the low-frequency response due to riser tension behavior, middle-range frequency response coming from winds and waves, and high-frequency response due to vortex induced-vibration. In this study, fatigue damage models were applied to predict the fatigue damages in a well-separated tri-modal spectrum, and the resultant fatigue damages of each model were compared with the most reasonable fatigue damage calculated by the inverse Fourier transform of the spectrum, rain-flow counting method, and Palmgren-Miner rule as a reference. The results show that the fatigue damage models developed for a wide-band spectrum are applicable to the tri-modal spectrum, and both the Benasciutti-Tovo and JB models could most accurately predict the fatigue damages of the tri-modal spectrum responses.

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References

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  1. A Study on the Riser Fatigue Analysis Using a Quarter-modal Spectrum vol.53, pp.6, 2016, https://doi.org/10.3744/SNAK.2016.53.6.514