Shape and size optimization of the double bottom structure of bulk carrier at the initial design stage with finite element analysis

Mitsuru Kitamura, Tetsuya Uedera, Kunihiro Hamada, Akihiro Takezawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

A structure optimization for the initial design stage of ship using FEM is considered in this paper. A general bulk carrier is selected as the target ship. Both the shape of the bottom structure and the size of plate thickness of the bulk carrier are taken as design variable simultaneously for a weight minimal optimization problem. Five geometric dimensions and thirty-one plate thicknesses are taken as the design variables for the shape and the size of the bottom structure, respectively. The yield stress for all elements of the three hold FEM model and the buckling stress for the selected stiffened panels are evaluated as the constraint conditions. The selected stiffened panels are on the bottom plate, the inner bottom plate, the girder plate, the floor plate, and the bilge hopper plate. The optimal calculations are performed with five combinations of the design variables and the constraint conditions, and the designs obtained by the optimal analyses are compared. It is shown that the structural optimization with the design variables for the shape and size of the bottom structure can reduce the weight of ship structure and satisfy the constraint conditions effectively. Since the design variables take discrete values, this problem becomes combinatorial optimization. So, the genetic algorithm is used for the optimal analyses.

Original languageEnglish
Title of host publicationProceedings of the 21st (2011) International Offshore and Polar Engineering Conference, ISOPE-2011
Pages839-844
Number of pages6
Publication statusPublished - 2011
Externally publishedYes
Event21st International Offshore and Polar Engineering Conference, ISOPE-2011 - Maui, HI, United States
Duration: 2011 Jun 192011 Jun 24

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Conference

Conference21st International Offshore and Polar Engineering Conference, ISOPE-2011
CountryUnited States
CityMaui, HI
Period11/6/1911/6/24

Keywords

  • Bulk carrier
  • Common structural rule
  • Double bottom structure
  • Finite element analysis
  • Shape and size optimization

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

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