Wave-loading fatigue analysis of deepwater drilling risers in frequency domain

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (11) : 7-11.

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Wave-loading fatigue analysis of deepwater drilling risers in frequency domain

LIU Xiu-quan, CHEN Guo-ming, CHANG Yuan-jiang, LIU Kang, YANG Huan-li

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Abstract

Wave-loading fatigue failure is one of main failure modes of deepwater drilling riser. Wave-loading fatigue analysis of riser provides guidance for fatigue design and management of riser in order to increase its service life. Methods for analyzing wave induced vibration and fatigue were established in frequency domain. Solver for riser fatigue calculation was developed based on MATLAB software. Wave-loading fatigue of the riser system in the South China Sea was calculated in frequency domain and compared with calculated fatigue based on time domain method. The results show that dynamic analysis of riser in frequency domain reaches convergence after several iteration steps. Compared with time domain method, frequency domain method enhances computation efficiency greatly. The response of riser system is a wide-band process so rainflow correction coefficient should be used in calculating riser fatigue. The wave-loading fatigue damage of riser in frequency domain is almost same with that in time domain. Riser fatigue analysis method proposed in this paper can be used for inertial fatigue analysis.

Key words

drilling riser / frequency domain method / fatigue analysis / finite element analysis / linearization

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LIU Xiu-quan;CHEN Guo-ming;CHANG Yuan-jiang;LIU Kang;YANG Huan-li. Wave-loading fatigue analysis of deepwater drilling risers in frequency domain[J]. Journal of Vibration and Shock, 2013, 32(11): 7-11