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Research Papers: CFD and VIV

Active Control of a Reduced Scale Riser Undergoing Vortex-Induced Vibrations

[+] Author and Article Information
Eugenio Fortaleza

Mechanical Engineering Department,
Universidade de Brasília (UnB),
Brasilia-DF, Brazil 70910-900
e-mail: efortaleza@unb.br

Contributed by the Ocean Offshore and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received February 11, 2011; final manuscript received February 16, 2012; published online February 22, 2013. Assoc. Editor: Bernt Leira.

J. Offshore Mech. Arct. Eng 135(1), 011802 (Feb 22, 2013) (5 pages) Paper No: OMAE-11-1013; doi: 10.1115/1.4006762 History: Received February 11, 2011; Revised February 16, 2012

This article concerns the use of an active control applied to a reduced scale riser undergoing vortex-induced vibrations (VIV). The control system relies upon the fact that a flexible structure undergoing VIV oscillates at frequencies corresponding to the structure resonant modes. These experiments were carried out in a recirculating water channel at IFP. For control design, the structure dynamic behavior is approximated by the dynamic behavior of its most excited mode. This is achieved through modal analysis and leads to a simple linear second order system. Its input is a displacement at the structure top end; its output is the structure displacement of a point away from the top end. The input is computed to attenuate the vibrations associated the most excited mode. This control strategy has been tested on a reduced scale experiment. These results are shown to agree with numerical results obtained on a phenomenological model. Both suggest a VIV reduction about 30%.

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Figures

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Fig. 1

Proposed practical application of the presented technology

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Fig. 5

Mean cross-flow displacement along the structure, open and closed loop and an approximation of the relative mechanical fatigue (power five of the mean cross-flow displacement

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Fig. 4

Numerical simulation bottom cross-flow displacement. Open and closed loop and their Fourier transforms.

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Fig. 3

Measured bottom cross-flow displacement. Open and closed loop and their Fourier transforms.

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Fig. 2

Experimental set overview

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