STABILITY ASSESSMENT FOR FLOATING STRUCTURES IN REALISTIC SEAS

This paper presents a reliable and easy-to-apply method for the assessment of a floating structure's transverse stability at sea. The theory of Markov process is used to derive the equations for the random decrement and the autocorrelation function of the nonlinear rolling motion for a ship sailing in a random oblique sea. The wave exciting moment, used as an input to the roll equation, is obtained as the output of a narrow band filter whose input is a White nose Guassian process. Thus, the theory of Markov processes can be used to model the roll motion of a ship acted upon by a wave exciting moment, which has a realistic spectral density. The random decrement and the autocorrelation functions are used to obtain estimates for the nonlinear righting moment of the ship. The identification method proposed uses only information obtained from roll measurements at sea. Results of numerical simulations, model tests and a full scale fishing vessel are presented.

  • Supplemental Notes:
    • STAB 94, 5th Intl Conf on Stability of Ships and Ocean Vehicles; 7-11 Nov 1994; Florida, USA. Sponsored by SNAME, USA and RINA, UK. Procs. Publ by Florida Inst Technology, USA. Vol 2, session 5 [14 p, 7 ref, 2 tab, 7 fig]
  • Authors:
    • Haddara, M R
    • Zhang, Y
  • Publication Date: 1994

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00717032
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 4 1996 12:00AM