정상 정규분포 확률과정의 삼봉형 스펙트럼에 대한 피로손상 모델 비교
Fatigue Damage Model Comparison with Tri-modal Spectrum under Stationary Gaussian Random Processes
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초록
The riser systems for floating offshore structures are known to experience tri-modal dynamic responses. These are owing to thecombined 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 ina well-separated tri-modal spectrum, and the resultant fatigue damages of each model were compared with the most reasonable fatigue damagecalculated by the inverse Fourier transform of the spectrum, rain-flow counting method, and Palmgren–Miner rule as a reference. The results showthat the fatigue damage models developed for a wide-band spectrum are applicable to the tri-modal spectrum, and both the Benasciutti–Tovo and JBmodels could most accurately predict the fatigue damages of the tri-modal spectrum responses.
Abstract
The riser systems for floating offshore structures are known to experience tri-modal dynamic responses. These are owing to thecombined 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 ina well-separated tri-modal spectrum, and the resultant fatigue damages of each model were compared with the most reasonable fatigue damagecalculated by the inverse Fourier transform of the spectrum, rain-flow counting method, and Palmgren–Miner rule as a reference. The results showthat the fatigue damage models developed for a wide-band spectrum are applicable to the tri-modal spectrum, and both the Benasciutti–Tovo and JBmodels could most accurately predict the fatigue damages of the tri-modal spectrum responses.
참고문헌 (16)
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