Hull Optimization Design for Minimum EEDI Based on

Abstract

EEDI (Energy Efficiency Design Index), which was a mandatory provision pointing at marine greenhouse gas emission, became a significant factor in ship hull form design. EEDI is closely related to the ship speed, which was used to be seen a determined value in conventional design stage. However, there are always fluctuations of speed in the actual sailing, so it's more reasonable to treat speed as a random variable, and from a long-term statistical point of view, the uncertainty of expectation and variance of the probability distribution should also be concerned. In order to solve the ship hull optimization problem for minimum EEDI with random variable, distributional robust optimization method under moment uncertainty is introduced in this research. Robust optimal model with NP-hard is transformed into a deterministic semi-definite programming one by Lagrange duality principle. Results verified the new method with fine rationality and superiority.