RESPONSE OF AN INFLATABLE OFFSHORE PLATFORM TO SURFACE WAVE EXCITATIONS

The response to the ocean wave excitations of a neutrally buoyant inflatable offshore platform consisting of an array of three tapered inflatable legs attached to a central head, connected to a surface float by a cable is investigated. A Lagrangian formulation of the dynamics of the system is presented where the float and the central head are allowed to move vertically and the rotations of the array as well as the flexural displacements of the legs are superposed on this motion. The non-linear coupled system with infinite degrees of freedom is truncated by considering the first two terms in the admissible function expansion of each flexural displacement. This results in a set of ordinary differential equations which are converted to algebraic equations using Ritz's averaging technique. Representative plots showing the effect of system parameters on the platform response are presented.

• Corporate Authors:

  American Institute of Aeronautics and Astronautics

  1290 Avenue of the Americas
  New York, NY  United States  10019
• Authors:
  • MODI, V J
  • Misra, A K
• Publication Date: 1980-1

Media Info

• Features: References;
• Pagination: p. 10-18
• Serial:
  • Journal of Hydronautics
  • Volume: 14
  • Issue Number: 1
  • Publisher: American Institute of Aeronautics and Astronautics

Subject/Index Terms

• TRT Terms: Bending; Cables; Excitation; Force; Hydrodynamic pressure; Inflatable structures; Motion; Offshore platforms; Stiffness; Structural analysis; Structural mechanics; Waves
• Uncontrolled Terms: Structural response
• Old TRIS Terms: Cable bending stiffness; Hydrodynamic forces; Platform motions; Wave forces on structures
• Subject Areas: Bridges and other structures; Design; Marine Transportation;

Filing Info

• Accession Number: 00312218
• Record Type: Publication
• Report/Paper Numbers: Article 79-0833R
• Files: TRIS
• Created Date: Jun 26 1980 12:00AM