OPTIMISATION OF SHIP STRUCTURES BASED ON PLASTIC DESIGN

In this paper a procedure for the optimisation of ship structures is developed on plastic design of ship structures consisting of the transverse and longitudinal members using the Sequential Unconstrained Minimisation Technique (SUMT). Using the developed method, the optimisation of a segregated ballast tanker is carried out considering the weight of one hold length as the objective function. Midship section scantlings are chosen as the design variables. Constraints are considered with respect to plastic collapse of hull girder under longitudinal bending, of structural members subjected to axial force, shear force and bending moment, and of platings subjected to lateral pressure. Constraints are also set in buckling strength of plating under inplane load and in design variables such as minimum plate thickness. The variations of maximum bending moments and shear force due to changes in design variables are calculated based on Taylor series expansion method so as to reduce the computation time of iterative calculation for function minimisation in the SUMT procedure. The tanker structure was optimised and the results show that the proposed method based on plastic design is an effective tool in the optimisation of ship structures. A comparison of the proposed method with the optimisation based on plastic design is also made and the results are presented.

• Supplemental Notes:
  • Soc Naval Arch Japan J, v 168 n 2, Dec 1990, p 419 [11 p, 11 ref, 6 tab, 10 fig]
• Authors:
  • Nobukawa, H
  • Rahim, M A
  • Yao, T
• Publication Date: 1990

Language

• English

Subject/Index Terms

• TRT Terms: Optimization; Plastic analysis; Ships
• Old TRIS Terms: Ship structures
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00702681
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM