Experimental and numerical simulation investigation on vortex-induced vibration test system based on bare fiber Bragg grating sensor technology for vertical riser

The Vortex-Induced Vibration (VIV) test system on deepwater riser based on Bare Fiber Bragg Grating (BFBG) sensor technology was designed. Meanwhile, a riser VIV response numerical model was established based on the work-energy principle. The results show that the first-order vibration frequency dominates the vibration of the riser, and as the velocity increases, the dominant frequency of the riser gradually increases under the effect of different top tensions. At the same velocity, as the top tension increases step by step, the dominant frequency and fatigue damage at the same position along the axial length of the riser both gradually decreases. The model test and numerical simulation show a relatively consistent change, maintaining a high degree of agreement. The process control system based on BFBG of model test has excellent performance, and FBG sensors have great advantages in VIV test of a vertical riser in water. (C) 2021 Society of Naval Architects of Korea. Production and hosting by Elsevier B.V.

Automated summary

The study designed a Vortex-Induced Vibration (VIV) test system for deepwater riser using Bare Fiber Bragg Grating (BFBG) sensor technology, and established a numerical model based on the work-energy principle. The results showed that the dominant frequency of riser vibration gradually increased with different top tensions as velocity increased, while at the same velocity, both dominant frequency and fatigue damage decreased gradually with increasing top tension. The experimental and numerical simulation results were consistent, with the BFBG-based process control system demonstrating excellent performance.