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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

DYNAMIC ANALYSIS OF OFFSHORE HEAVY LIFTS

With the increasing weights of modules being lifted offshore using the new generation SSCV's, the requirement for accurate analysis and simulation of the lifting and setting sequence becomes self evident. This analysis is particularly relevant in terms of determining the size of installation aids required, as well as the definition of operational limits. The paper begins by outlining the modelling techniques employed in the frequency domain analysis of lifting, in particular the method for setting up the stiffness matrix, employing all degrees of freedom, and its reduction to fewer numbers of degrees of freedom. Results of an extensive series of frequency domain analysis are presented covering three different weights of module, side and stern lifts, and using both one and two cranes. Load estimates are presented for bumpers, and for the slings. The method of extending the frequency domain techniques into the time domain are discussed, including the representation of the nonlinear constraints such as bumpers, guides and stab cones. Some simple examples are presented illustrating the effects to be seen in the time domain, and comparisons given between frequency and time domain analysis. The significance of these results for the estimation of loading in slings, and in bumpers and guides is discussed.

  • Supplemental Notes:
    • ISOPE 91, 1st Intnl Offshore & Polar Engng Conference; 11-16 Aug 1991; Edinburgh, U.K. Sponsored by Intl Soc Offshore & Polar Engrs (ISOPE) et al. Procs. Publ by ISOPE, ISBN 0-9626104-61, Vol 1, p 23 [12 p, 4 ref, 18 ref]
  • Authors:
    • Hamilton, J
    • Ramzan, F
  • Publication Date: 1991

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00702337
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM