船舶多学科设计优化中的船型变换模块

为了实现船型优化,第一步需要按照设计变量的改变来生成船型,这样就需要一个变换程序将母型船变换成设计船.当船型优化发展到基于CFD以后,传统的通过主尺度和几个船型参数例如Cp,Cw等来控制船体型线的做法已经不能满足要求,需要对船型进行更加准确,细致的控制.为了解决这个问题,文中开发了一个新的船型变换程序,它直接读人横剖面面积曲线和设计水线,然后变换船体型线以满足这两根曲线的要求.该程序的变换步骤包括主尺度仿射变换,Cm变换,横剖面面积曲线变换和设计水线变换.程序中主要的变换方法为广义Lackenby变换,仿射变换等.该程序由于直接根据横剖面面积曲线和设计水线来控制型线,使船型变换模块的设计变量从10个左右扩展到了40个以上,增加了船型优化提升船体性能的可能性.该程序是船舶多学科设计优化的船型优化模块的前处理程序.

A Ship Hull Transform Program for Multidisciplinary Design Optimization

In order to implement the hull form optimization,a new hull transformation program is in-troduced. It reads the curves of transverse sections areas (CTSA) and of design waterline (CDWL)directly, and then transform the shipform to meet these two curves. The transform process includes affine transform of ship principal dimension, Cm transform, transform of CTSA and CDWL. The main transform methods of this program are Popularized Lackenby method and affine transform method. Because the CTSA and CDWL are directly controlled by the optimizer and read into the program, this program can control and change the shipform in a much more detail than common transform program.This program is a pre-processing program for the hull optimization module of the ship Muhidisciplinary Design Optimization (MDO) model.