Experiments with a flexible and submerged cylinder were carried out to investigate fundamental aspects of risers dynamics subjected to harmonic excitation at the top. The flexible model was designed aiming a high level of dynamic similarity with a real riser. Vertical motion, with amplitude of 1% of the unstretched length, was imposed with a device driven by a servomotor. Four values of the ratio between the exciting frequencies and the first eigenfrequency were investigated, namely ft: fN,1 = 1 : 3; 1 : 1; 2 : 1 and 3 : 1. Cartesian coordinates of 43 monitored points positioned all along the span were experimentally acquired by using an optical tracking system. A simple Galerkin’s scheme applied for modal decomposition, combined with standard Mathieu chart analysis, led to the idenfication of parametric resonances. A curious finding of this paper is that the Mathieu instability may simultaneously occur in more than one mode, leading to interesting dynamic behaviors, also revealed through standard power spectra analysis and displacement scalograms.
Skip Nav Destination
ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
June 8–13, 2014
San Francisco, California, USA
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4540-0
PROCEEDINGS PAPER
Experimental Analysis of a Vertical and Flexible Cylinder in Water: Response to Top Motion Excitation and Parametric Resonance
Guilherme R. Franzini,
Guilherme R. Franzini
University of São Paulo, São Paulo, Brazil
Search for other works by this author on:
Celso P. Pesce,
Celso P. Pesce
University of São Paulo, São Paulo, Brazil
Search for other works by this author on:
Rafael Salles,
Rafael Salles
University of São Paulo, São Paulo, Brazil
Search for other works by this author on:
Rodolfo T. Gonçalves,
Rodolfo T. Gonçalves
University of São Paulo, São Paulo, Brazil
Search for other works by this author on:
André L. C. Fujarra,
André L. C. Fujarra
University of São Paulo, São Paulo, Brazil
Search for other works by this author on:
Pedro Mendes
Pedro Mendes
Petrobras, Rio de Janeiro, Brazil
Search for other works by this author on:
Guilherme R. Franzini
University of São Paulo, São Paulo, Brazil
Celso P. Pesce
University of São Paulo, São Paulo, Brazil
Rafael Salles
University of São Paulo, São Paulo, Brazil
Rodolfo T. Gonçalves
University of São Paulo, São Paulo, Brazil
André L. C. Fujarra
University of São Paulo, São Paulo, Brazil
Pedro Mendes
Petrobras, Rio de Janeiro, Brazil
Paper No:
OMAE2014-24178, V002T08A066; 14 pages
Published Online:
October 1, 2014
Citation
Franzini, GR, Pesce, CP, Salles, R, Gonçalves, RT, Fujarra, ALC, & Mendes, P. "Experimental Analysis of a Vertical and Flexible Cylinder in Water: Response to Top Motion Excitation and Parametric Resonance." Proceedings of the ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. Volume 2: CFD and VIV. San Francisco, California, USA. June 8–13, 2014. V002T08A066. ASME. https://doi.org/10.1115/OMAE2014-24178
Download citation file:
15
Views
Related Proceedings Papers
Related Articles
Experimental Analysis of a Vertical and Flexible Cylinder in Water: Response to Top Motion Excitation and Parametric Resonance
J. Vib. Acoust (June,2015)
Longitudinal Resonant Behavior of Very Deep Water Risers
J. Energy Resour. Technol (September,1983)
Preliminary Design of Differentiated Compliance Anchoring Systems
J. Offshore Mech. Arct. Eng (February,1999)
Related Chapters
Production Riser Life Extension – A Class Perspective
Ageing and Life Extension of Offshore Facilities
Fluidelastic Instability of Tube Bundles in Single-Phase Flow
Flow-Induced Vibration Handbook for Nuclear and Process Equipment
Vortex-Induced Vibration
Flow Induced Vibration of Power and Process Plant Components: A Practical Workbook