Optimisation of passenger ship structures in concept design stage

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Meyer Turku Shipyard

Abstract

This paper presents an optimization method for concept design state of passenger ship with focus on utilisation of efficient Finite Element Modelling, evolutionary optimisation algorithm and indirect constraint relaxation. The response is analysed using 3D coarse mesh global finite element (FE) model, where stiffened panels are modelled using equivalent single layer (ESL) elements and the primary stiffeners are modelled with offset beam elements. The simplifications on stiffened panels and beams enable exploration of design space without changing the FE-mesh. The strength is defined based on classification society rules. Local stress peaks are allowed to exceed the rule-based strength limits, i.e. stress constraints are relaxed indirectly. Instead of increasing the allowed stress levels, the amount of material exceeding strength criteria is utilised. Optimization is based on Particle Swarm Optimization (PSO) algorithm with objective to reduce steel weight. The results show that stress relaxation has significant effect on the obtained total mass.

Details

Original languageEnglish
Number of pages15
JournalShips and Offshore Structures
Publication statusE-pub ahead of print - 19 Mar 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • Optimisation, equivalent single layer (ESL) theory, equivalent element, particle swarm optimisation, global finite element model, passenger ship, constraint relaxation, TOPOLOGY OPTIMIZATION, RELAXATION

ID: 33204967