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http://dx.doi.org/10.5574/KSOE.2014.28.3.185

Fatigue Damage Model Comparison with Tri-modal Spectrum under Stationary Gaussian Random Processes  

Park, Jun-Bum (Lloyd's Register Asia)
Jeong, Se-Min (R&D Institute, Daewoo Shipbuilding & Marine Engineering Co., Ltd.)
Publication Information
Journal of Ocean Engineering and Technology / v.28, no.3, 2014 , pp. 185-192 More about this Journal
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.
Keywords
Fatigue damage model; Tri-modal spectrum; Rain-flow counting method;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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