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Damping Characteristics of Heave Plates Attached to Spar Hull

[+] Author Affiliations
Nimmy Thankom Philip, S. Nallayarasu, S. K. Bhattacharyya

Indian Institute of Technology Madras, Chennai, India

Paper No. OMAE2012-83290, pp. 249-260; 12 pages
doi:10.1115/OMAE2012-83290
From:
  • ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology
  • Rio de Janeiro, Brazil, July 1–6, 2012
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4488-5
  • Copyright © 2012 by ASME

abstract

Damping elements are used in ships and offshore structures as response reduction devices for maintaining the hydrodynamic response within acceptable limits. The use of such elements so far has been based on past experience or using empirical based design approach. An investigation of the wave excitation forces acting on these structures with and without damping elements may give an insight into the damping effects of such elements. Also understanding the flow pattern and the magnitude of flow variation around these elements may be useful to improve the design methods. In the present study, measurement of damping forces and response were carried out to establish the relationship between wave frequency amplitude and damping ratio. It was observed that the damping varies with wave period non-linearly and linearly with wave height. Also it was observed that increase in added mass combined with viscous damping is a key factor for the effectiveness of heave plates in reducing motion response of spar platforms. Of the various configurations tested, the spar with double heave plate at the bottom has higher damping compared to other configurations.

Copyright © 2012 by ASME

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