Single- and multi-objective design optimization study for DTMB 5415, based on low fidelity solvers

The report presents the research activities conducted within the NATO RTO Task Group AVT-204 "Assess the Ability to Optimize Hull Forms of Sea Vehicles for Best Performance in a Sea Environment." Specifically, single- and multi-objective simulation-based design optimization studies for a USS Arleigh Burke-class destroyer, namely the DDG-51, are performed, based on low fidelity solvers. The DTMB 5415 model, an open-to-public early concept of the DDG-51, is used in the current study. The present work aims at the reduction of two different objective functions, namely (F1) the weighted sum of the total resistance in calm water at 18 and 30 kn, and (F2) a seakeeping merit factor based on the vertical acceleration of the bridge and the roll motion. A potential flow code and a linear strip theory are used for the analysis. Results by single- and multi-objective deterministic particle swarm optimization algorithms are presented. Bare hull and sonar dome shape modifications are defined in terms of orthogonal basis functions. Six design spaces are investigated varying the space dimension and the associated design variables bounds. The optimal shape selected provides an improvement by 6.7% and 6.8% for F1 and F2, respectively.