In structural optimisation, the computational cost increases rapidly as the number of design variables increases. In this paper, multi-level optimisationis proposed which decreases computation cost and is a more natural way of carrying out optimal structures design in the distributed design practice in which different engineers design different parts of the structures. The optimal designs of ship structures that minimize weight subjected to strength constraints are derived. The equivalent thicknesses of the stiffened plates are taken as global design variables that are used in overall optimisation, and the detail sizes of stiffened plates are taken as local design variables that appear in a single sub-system. The transformation of the constraints into objective functions is carried out to include local design variables in the objective function, which is necessary for multi-level optimisation. By comparing the single level optimal design and multi level optimal design, it was shown that in the multi level optimisation the number of iteration to reach optimal design decreases dramatically, and the computation cost also becomes quite small.

  • Supplemental Notes:
    • J Soc Naval Arch Japan, v 178, Dec 1995, p 405 [7 p, 7 ref, 4 tab, 8 fig]
  • Authors:
    • Suzuki, K
    • Ohtsubo, H
  • Publication Date: 1995


  • Japanese

Subject/Index Terms

Filing Info

  • Accession Number: 00727894
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Nov 4 1996 12:00AM