A concept of omni-optimization for ship structural design

Omni-optimization assumes a capability to perform any type of optimization, e.g. single- and multi-objective, using single optimization algorithms, or the omni-optimizer. This paper addresses a novel concept for omni-optimization, by coupling vectorization with genetic algorithms (GAs). Vectorization assumes converting constraints into objectives, and their optimization alongside the original set of objectives. The GAs show excellent potential to serve as omni-optimizers, as they are a successfully tool to solve both single- and multi-objective problems. This new concept is applied to structural design of the midship section of an 88m long aluminium fast ferry for the minimal hull weight and vertical centre of gravity (VCG), under multiple constraints involving structural and technological aspects and classification rules and regulations. The obtained results range up to 10 per cent for weight minimization and 6.5 per cent for VCG with the fully defined Pareto front.