Parallel Constrained Multi-Objective Optimization for Ship Design Damage Stability Problem with (In)Expensive Function Evaluations

International Conference on Computational Methods in Marine Engineering (MARINE)

Abstract

Parametric ship design optimization is seen as a challenging task due to complex problem characteristics.Problems often have multiple decision variables, multiple expensive to evaluate conflicting objectives, and are subject to regulatory and volumetric constraints.One example of such a problem has been encountered at C-Job Naval Architects when optimizing the internal layout of a single-hold general cargo vessel [1].The two objectives of the study are maximization of the survivability of the vessel while simultaneously maximizing the cargo hold volume.The problem has three volumetric constraints, and one regulatory constraint for the required damage stability index.The internal layout of the vessel is modified with 17 variables that influence the positioning of the watertight bulkheads in the transverse, longitudinal, and vertical directions and the location of openings/hatches/vents.The calculation of the volumetric objective and constraints are inexpensive to evaluate, while the regulatory damage stability constraint and objective are time-consuming to evaluate.To speed up this process, three design variants can be evaluated in parallel with the commercial DELFTship software.

Authors 1

1. Ruth Winter corresponding Aachen Leiden Institute of Advanced Computer Science Niels Bohrweg 1

   Leiden University

   Affiliation as printed

   C-Job Naval Architects Regulusplein 1 , 2132 JN Hoofddorp , The Netherlands

   Leiden Institute of Advanced Computer Science (LIACS) Niels Bohrweg 1 , 2333 CA Leiden , The Netherlands

   C-Job Naval Architects Regulusplein 1, 2132 JN Hoofddorp, The Netherlands

   Leiden Institute of Advanced Computer Science (LIACS) Niels Bohrweg 1, 2333 CA Leiden, The Netherlands