Establishment of a design study for comprehensive hydrodynamic optimisation in the preliminary stage of the ship design

Aung, Myo Zin and Nazemian, Amin and Boulougouris, Evangelos and Wang, Haibin and Duman, Suleyman and Xu, Xue (2024) Establishment of a design study for comprehensive hydrodynamic optimisation in the preliminary stage of the ship design. Ships and Offshore Structures, 19 (6). pp. 793-806. ISSN 1754-212X (https://doi.org/10.1080/17445302.2023.2208500)

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Abstract

An automated practical multi-objective optimisation scheme is proposed for ship hull modification. A shift transformation and a self-blending method are sequentially performed based on resistance objectives at multi-design speeds. The Lackenby variation alters hull forms and produces initial designs. Subsequently, self-blending method combines obtained ships to cover design space. All processes are automated by MATLAB coding that connects the ©Maxsurf modeller and ©Maxsurf Resistance in the case of panel method resistance calculation. After whole shape optimisation, the platform defines ship portions in the stern and bow regions. Particularly, an approximation modelling Least-Square approach is investigated to construct a surrogate model. Optimisation results indicate 11.26% cost function reduction contributes to 16.23% resistance reduction at lower speed and 6.12% resistance reduction at higher speed for a passenger catamaran boat. Thus, the developed in-house optimisation code provides an optimal and cost-effective solution for hydrodynamic optimisation in the preliminary stage of ship design.