Abstract
An optimum structural design system for double hull VLCC is developed based on the generalized slope deflection method for the direct calculation and the Hooke & Jeeves direct search method for the optimum design. By dividing the ship structures into longitudinal members, transverse web frame members and transverse bulkhead members, the longitudinal members are designed by the classification rules such as DnV, Lloyd and the transverse web frame members and the transverse bulkhead members are designed by the generalized slope deflection method which incorporated axial deformations into the existing slope deflection method. By this system, several minimum hull weight designs of double hull VLCC of 300,000 DWT are performed. And the design results are compared with existing ships and the automatic drawing of midship section is also provided.
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