Over the past number of years, numerous incidents of damage to the internal steelwork of fluid-carrying vessels have been reported. The origin of this damage is due to vibrations generated by the propeller and propulsive plant. During the theoretical studies aimed at solving the problem, it has been shown that there is a remarkable lack of a rational method to take account of one of the most important parameters, the apparent supplementary mass, called the virtual added mass of fluid, in contact with the vibrating steelwork. Previous studies have demonstrated the impossibility of determination a priori of the dynamic boundary conditions for different vibratory modes of partial steelwork that may enable correct vibration calculations to be made of such partial systems. In order to correctly treat the vibratory problems concerned, it was necessary to establish a program that included fluid finite elements and coupling elements with solid elements used by finite-element method (FEM) calculations. This paper presents results of theoretical studies concerning FEM modelization of the steelwork and calculations of free vibrations in air and in fluid of the assembly of a transverse ring of a tanker. The study includes calculations in air and comparison with experimental results, calculations in fluid using the lumped-mass method and fluid FEM, and correlation of both types of calculations with measurements executed on a very large crude carrier.

  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  United States  07306-2907
  • Authors:
    • Volcy, G C
    • Baudin, M M
    • Bereau, M D
  • Publication Date: 1980

Media Info

  • Features: References;
  • Pagination: 17 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00323481
  • Record Type: Publication
  • Report/Paper Numbers: No. 12
  • Files: TRIS
  • Created Date: Feb 18 1981 12:00AM