Optimisation of passenger ship structures in concept design stage

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Optimisation of passenger ship structures in concept design stage

Raikunen, Joni / Avi, Eero / Remes, Heikki / Romanoff, Jani / Lillemäe-Avi, Ingrit / Niemelä, Ari

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.

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Document information

Title :

Optimisation of passenger ship structures in concept design stage

Contributors:

Raikunen, Joni (author) / Avi, Eero (author) / Remes, Heikki (author) / Romanoff, Jani (author) / Lillemäe-Avi, Ingrit (author) / Niemelä, Ari (author)

Published in:

Ships and Offshore Structures ; 14 , sup1 ; 320-334

Publication date :

2019-10-03

Size :

15 pages

ISSN :

1744-5302 , 1754-212X

DOI :

https://doi.org/10.1080/17445302.2019.1590947

Type of media :

Article (Journal)