Development of Practical Integrated Optimization Method for Ship Geometry with High Performance in Waves

Abstract

To enhance performance of a ship in waves, improvement of its geometry appears to be important and should be treated properly. For this purpose, a practical integrated optimization method is developed to acquire improved ship geometry. Namely the Enhanced Unified Theory (EUT) and the Binary-Coded Genetic Algorithm (BCGA) are integrated together to optimize the ship hull geometry of a basis hull through its Sectional Area Curve (SAC). A modified Wigley model is firstly employed as a basis hull and optimized for some wavelength regions. From the obtained results, the added resistance of modified Wigley model decreases in large amount at the desired wavelength region. Furthermore, optimization with an actual ship e.g. SR-108 is also performed with the aim of illustrating effectiveness of the present method for practical purposes. The obtained results show a large reduction of the added resistance while discrepancy in the steady wave resistance is negligible and the total resistance is confirmed to diminish accordingly.