A Study Of Optimal Hull Form For Minimum Resistance

Resistance is one of the most important ship's performance. If engineer can design a optimal ship hull form for minimum resistance, it will save much labor,time and expenses in course of ship design. Wave resistance takes up important station in ship resistance. In recent years, the theory of wave resistance develops greatly, optimization of ship form have been an active and valuable study direction.In this thesis the author mainly studies the method of optimizing conventional ship in thorey. The paper introduces Noblesse's New Slender Ship Theory, which is applicable for calculating the wave resistance of conventional ship. And the author deduces the numerical calculation method of Noblesse's New Slender Ship Theory. The paper uses 1957ITTC formula to calculate friction resistance. The paper translates qualification of tonnage into non-qualification by designing Genetic Algorithms'modle aboratively.The paper also adopts Non-Uniform Rational B-Spline to fit ship line, and produces cubic Non-Uniform Rational B-Spline computation process. Through the example computation shows that Non-Uniform Rational B-Spline can fit ship hull form btter, and it prepares for the panel arrangement and fairing line.At last, the paper uses Matlab to write calculation procedure of resistance and Genetic Algorithms. The procedure was applied to Wigley ship style. The course of hull form refining corresponding to the requirements of minimum wave resistance and of minimumtotal resistance are conducted respectively here by use of a W igley form as the parent form.The calculating result shows that the method of ship form optimization the paper puts forward can attain anticipant purpose. And it laid the foundations of practical ship form optimization.