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Hull Structure Analysis and Optimization for RO-PAX Ship - Technical Report

RoPax Ship, finite elements, MAESTRO modeling, (A) Objectives of the study are: (1)-Structural optimization for minimal weight of RoPax Ship under DnV requirements. Structure is based on given topology and geometry ; (2)-Sensitivity analysis of ship structural weight with respect to web frame spacing of 2400, 2800 and 3000 mm (B) Structural optimization is performed on the 12 web frame spacings long model which is dominating ship structure scantlings between frames 30 and 278. Program MAESTRO is used for optimization. Designer identified 264 design variables and has given min-max and proportionality requirements. 3D FEM model includes 5850 degres of freedom for model capable of solving nonsymetric loadcases. 1067 macroelements and 212 ordinary elements are modeled for response calculation . 7 loadcases are defined according to DnV and designers requests. 52416 safety checks are performed on each model of webframe spacing. Results show that savings of ~10 % are obtained by simultaneously resolving structural problems of given prototype and increasing safety. For cargo space length savings in material and increased deadweight of about 560t are possible with increase in safety and gain of at least 300 mm in ship height. Standardization of profiles (plate and frame /girder thickness are standardized ) will somewhat decrease the savings.

RoPax Ship; finite elements; MAESTRO modeling;

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