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Hydroelastic Analysis for Extended-Column of Extended Draft Semi-Submersible

[+] Author Affiliations
Zhi Yung Tay, Petyo Rumenov Popov, Vasil Zhivkov Yordanov, Hoang Dat Nguyen

Keppel Offshore and Marine Technology Centre, Singapore

Paper No. OMAE2014-23335, pp. V08AT06A027; 13 pages
doi:10.1115/OMAE2014-23335
From:
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 8A: Ocean Engineering
  • San Francisco, California, USA, June 8–13, 2014
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4550-9
  • Copyright © 2014 by ASME

abstract

This paper presents a simplified model for assessing the hydroelasticity of the extended-column (e-column) for an extended-draft semi-submersible (E-SEMI) by using commercially available software. The E-SEMI comprises a second tier pontoon (STP) connected to a conventional semi-submersible by using extended-column (e-column). The purpose of attaching the STP is to increase the heave added mass, and as a result, could reduce the heaving motion and shift the natural period further away from the wave spectrum by increasing the natural period. One of the challenges of the E-SEMI is to obtain the hydroelastic response of the e-column when subjected to wave and current loadings. The simplified model models the e-column and STP using beam-column theory that has similar vibration frequencies and modes shapes of the complex model. The potential wave theory is used to model the waves and the Morrison equation is use to obtain the drag and inertia force acting on the e-column due to current loading. Hydroelasticity shall be performed on this simplified model to assess the strength performance as well as the deflection of the e-column. The bending moment obtained from the hydroelastic analysis is also significant in the connector design that keeps the e-column in place.

Copyright © 2014 by ASME

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