Damage identification of&nbsp; top tensioned riser based on wavelet packet transforms

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (12) : 220-227.

FAULT DIAGNOSIS ANALYSIS

Damage identification of top tensioned riser based on wavelet packet transforms

LI Xiaomin,ZHANG Chengqiang,LI Fuheng*,LI Guoshun

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Abstract

In order to quickly and accurately locate the location of damage to the top tension riser (TTR), avoid the economic and environmental hazards caused by riser damage. A TTR damage identification method based on wavelet packet transform is proposed. Analyzing the acceleration dynamic response before and after TTR damage, relevant information about the evolution of the structure with damage is extracted as damage features. Firstly, the vibration acceleration signal of the riser is decomposed into wavelet packet components of different frequency bands using wavelet packet decomposition. Then, the wavelet packet energy of each sub-band is calculated and summed, and the wavelet packet energy curvature is obtained using the second-order difference method. Reducing the elastic modulus of the unit to simulate damage, the difference in energy curvature before and after damage is used as an indicator for identifying and locating riser damage. Research was conducted on TTR simulation models with different damage scenarios, and the effects of noise interference, unit partitioning, and local quality changes on the localization performance of the method were analyzed. The results indicate that this method can provide accurate location of riser damage, has a certain anti-interference ability against noise effects, and is not affected by unit division, and is insensitive to local quality changes in the riser.

Key words

top tensioned riser (TTR) / wavelet packet energy curvature / damage simulation / damage identification

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LI Xiaomin, ZHANG Chengqiang, LI Fuheng, LI Guoshun. Damage identification of top tensioned riser based on wavelet packet transforms[J]. Journal of Vibration and Shock, 2025, 44(12): 220-227

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