基于Rankine源法的船体线型优化设计

Optimization Design of Hull Lines Based on Rankine Source Method

在船舶初步设计阶段,为了快速、准确地获得阻力性能优良的船型方案,将势流兴波阻力理论Rankine源法、黏性理论和最优化技术有机结合,开发了适用于实船的线型优化设计程序.在优化计算过程中,将降低兴波阻力作为主要目标,将排水量限制作为基本约束条件,将反映船型变化的船型修改函数参数作为设计变量,采用非线性规划法中的SUMT(sequential unconstrainedmini mization technique)内点法进行最优化计算.通过对某高速水面舰船前半体不同区域的优化计算,获得的改良船型降阻效果明显,由此验证了该程序用于船型优化的有效性和可行性.

In the preliminary design of a ship,in order to obtain a hull form with excellent resistance performance rapidly and accurately,the optimized design program of ship lines using optimal full-scale ship was developed,which combined the Rankine source method（one of the wave-making resistance theory of potential flow） and viscous theory with the optimization technique.In the optimization process,the SUMT interior point method of Nonlinear Programming（NLP） was proposed with reducing wave-making resistance as the main objective function, with appropriate displacement as a basic constraint condition and the parameters of hull form modification function as design variables.Finally,the numerical optimization examples for different regions of fore-body of full-scale surface vessel were provided,which indicated that the resistance was reduced distinctly by this optimal method.