A systematic approach is described by which divergence characteristics of swept or unswept hydrofoils may be calculated. The computer program, called SWDIVRG, developed to do the calculations, makes use of a lumped-parameter approach, resulting in a matrix solution of the system. The bending and torsional displacements at any of N stations along the hydrofoil span can be calculated at speeds less than divergence. Bending and torsional moments can be calculated for the condition of cantilever-beam constraints. The divergence speed is principally computed by an eigenvector iteration scheme. A convenient formulation and a plot are provided for estimating the hydrodynamic loading parameters for finite-span, surface-piercing hydrofoils. Also, a useful closed-form divergence formulation, which considers submergence level, has been derived for the special case of a uniform cantilever strut or foil. Test calculations of airfoil models and one hydrofoil model, using both SWDIVRG and the closed-form solution, show good agreement with experimental model-divergence speeds.

  • Corporate Authors:

    Naval Ship Research and Development Center

    Ship Acoustics Department
    Bethesda, MD  United States  20034
  • Authors:
    • Caspar, J R
  • Publication Date: 1974-4

Media Info

  • Features: Appendices; References;
  • Pagination: 80 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00054994
  • Record Type: Publication
  • Source Agency: Naval Ship Research and Development Center
  • Report/Paper Numbers: #4245
  • Files: TRIS
  • Created Date: Jul 15 1974 12:00AM