Damage diagnosis strategy for offshore risers based on statistical features of strain responses

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (1) : 23-30.

REN Peng1, ZHOU Zhi1,2, WU Wenhua3, OU Jinping2

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Abstract

Considering the service environment and the monitoring technology level of offshore risers, a damage diagnosis method was developed based on statistical characteristics of strain responses. A mapping relation between modal parameters and strain responses of a strainmeasured element was derived for a beamlike structure. A root mean square strain based on a set of test data was proposed as the damage characteristic parameter of offshore risers. Aiming at a plamage misjudging due to a lower level of damage or a larger measurement noise, the data were processed based on the wavelet de-noising and decomposition. Furthermore, a TTR on a TLP was simulated to obtain the damage characteristic parameter through analyzing 500 strain-measured elements at the top of the TTR. The results showed that the method can be used to identify the local stiffness dropping of the TTR effectively althrough the damage diagnosis is interfered by the measurement noise and other uncertain factors; the damage diagnosis strategy can provide a support for structural health monitoring both theoretically and technically.

Key words

Offshore riser / damage diagnosis / strain response / statistical characteristic / wavelet multi-resolution

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REN Peng1, ZHOU Zhi1,2, WU Wenhua3, OU Jinping2. Damage diagnosis strategy for offshore risers based on statistical features of strain responses[J]. Journal of Vibration and Shock, 2017, 36(1): 23-30

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