Application of the modern ship structural design procedure is presented on the megayacht example for all design phases (concept, preliminary and detail). Benefits of utilization of modern rational design support technique (FEM, optimization, etc.) are demonstrated through achieved results (reduction of weight/cost and increase of safety). Approach which employs full ship FEM model which enables simulation of realistic 3D effects without restricting assumptions proved to be the right choice.

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... ented work is a result of successful cooperation trough joint work of industry and University of Zagreb research teams and represents an example of modern procedure in structural design of complex ships. different double bottom framing were optimized regarding structural mass combined with control of safety measures and VCG position. Design constraints were scantlings' ratios and min-max values, local vibrations criteria (analytically calculated), and LR safety criteria (Lloyd's Register, 2004-Part A). The efficient solutions were generated for selection of the preferred design variant (mass/length ratio ranged from 30.14 down to 21.88 t/m with increase in all safety measures. Preliminary Design Phase (PDP): main structural scantling of the selected preferred mega-yacht was verified using refined full ship FEM model. Global hull girder and substructure free vibration calculation were performed using FEM to verify acceptance of vibration criteria. Detail Design Phase (DDP): FEM model was further refined to fine mesh level to suit LR require-