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Concomitant vortex-induced vibration experiments: a cantilevered flexible cylinder and a rigid cylinder mounted on a leaf-spring apparatus

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Abstract

This paper presents experimental results of vortex-induced vibrations (VIV), concomitantly carried out in water with a flexible cylinder, rigidly fixed, and with a ‘rigid’ cylinder, mounted on an elastic apparatus. The experiments were run at IPT towing tank facility, in a side-by-side arrangement. The flexible cylinder is simply fixed at the upper end. For the flexible cylinder, two degrees of freedom (2DOF) are implied for each vibration mode: crosswise and aligned with respect to the incident flow. The elastic support to which the ‘rigid’ cylinder is mounted is made of two vertical leaf-springs, fixed to two thick horizontal plates, conferring to the cylinder a single degree of freedom (SDOF) to oscillate transversally with respect to the incident flow. The mass ratios of the cylinders are almost the same, around 1.2 and 1.4, respectively, very low values, typical of long ocean pipe structures, as risers and pipelines. The structural damping ratio is also typically low and such as to guarantee high-amplitude responses. Besides usual spectral and statistical analysis, the Hilbert–Huang spectral analysis technique is applied, as, strictly, VIV is a non-stationary oscillation emerged from a nonlinear dynamic system. A discussion is made on the distinct VIV behaviors of the SDOF and the 2DOF systems.

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Notes

  1. Fluids and Dynamics Research Group, Department of Mechanical Engineering, Escola Politécnica, USP.

  2. The inline resonance corresponding to the first bending mode did not appear due to the cut off frequency used, filtering of accelerometer signal.

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Acknowledgments

The authors acknowledge CNPq, FAPESP and FINEP for sponsoring the research activities on VIV and riser dynamics. The authors thank the Technological Research Institute of São Paulo State (IPT) for the use of the towing tank.

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Authors and Affiliations

  1. Offshore Mechanics Laboratory, Escola Politécnica, University of São Paulo, São Paulo, Brazil

    Guilherme Rosa Franzini, Celso P. Pesce & André L. C. Fujarra

  2. Numerical Offshore Tank, TPN, Escola Politécnica, University of São Paulo, São Paulo, Brazil

    Guilherme Rosa Franzini, Rodolfo T. Gonçalves & André L. C. Fujarra

  3. Technological Research Institute, São Paulo, Brazil

    Adriano A. P. Pereira

Authors
  1. Guilherme Rosa Franzini
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  2. Celso P. Pesce
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  3. Rodolfo T. Gonçalves
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  4. André L. C. Fujarra
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  5. Adriano A. P. Pereira
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Correspondence to Guilherme Rosa Franzini.

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Technical Editor: Celso Morooka.

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Franzini, G.R., Pesce, C.P., Gonçalves, R.T. et al. Concomitant vortex-induced vibration experiments: a cantilevered flexible cylinder and a rigid cylinder mounted on a leaf-spring apparatus. J Braz. Soc. Mech. Sci. Eng. 36, 547–558 (2014). https://doi.org/10.1007/s40430-013-0095-x

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  • DOI: https://doi.org/10.1007/s40430-013-0095-x

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