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AIAA-2000-4791 A Multidisciplinary Design Optimization Scheme for Containerships

A multidisciplinary design optimization scheme for ships has been developed for use in an integrated ship design environment. Although the system was designed with the intention of using analysis techniques based on first principles, the containership design examples presented in this paper make use of parametric analysis modules developed to examine problem formulation issues prior to the availability of the higher fidelity modules. A method of hull shape control based on a barycentric blend of basis hulls is developed. It requires relatively few design variables. In addition to general-purpose geometry, hydrostatic and resistance modules, containership-specific weight, cargo and economics modules were developed. The measure of merit is taken to be the required freight rate. Optimal ship size is found to depend largely on port loading and unloading capabilities. The required freight rate increases and the speed of the optimal ship decreases as voyage length is decreased or fuel cost is increased. The need for a design variable controlling ballast is demonstrated.