小水线面双体船型线设计方法研究

本文在分析小水线面双体船(SWATH)型线特征的基础上,按横剖面形状对SWATH进行分类,并给出相关设计参数.在给定主尺度的情况下,首先生成初始的中横剖面,经修改至满意的形状后,生成初始的横剖面面积曲线和支柱厚度分布曲线,此时可改变曲线的型值点及首尾切向矢量来控制前体、后体形状及平行中体的长度,也可指定排水量和浮心坐标对曲线进行局部调整,按调整后的横剖面面积曲线和支柱厚度分布曲线便可插值生成一系列沿船长方向的横剖面,实现了数学船型的表达.针对其中最为典型和实用的圆弧直线形SWATH船,文中给出了详细的设计方法.利用objectARX,在AUTOCAD环境下进行了软件开发,实现了SWATH船型线的快速设计.该软件采用面向对象和设计模式的思想,具有良好的可扩展性.最后通过对一系列SWATH船的设计,证明了本文方法的正确性和软件实用性.

Research on Method of SWATH Ship Form Desgin

This paper classifies the SWATH ship according to cross section based on the form characteristic, and gives the design parameters of SWATH ship as well. With given main parameters, initialized mid-cross section is generated firstly, and then designer can modify this cross section until satisfied shape and scale are gained. After mid-cross section is decided, the initialized distributed curve of area of cross section and the distributed curve of strut thickness can be obtained. Modifying the fit points on the two distributed curves the various forms of front body, parallel body and hind body can be obtained. Also the curve of area of cross section can be automatically approached under given displacement and longitudinal float center. Using foregoing two distributed curves, a series of cross sections will be generated, thus a mathematic ship form is created, and can be rapidly used for subsequent performance evaluation. Taking the typical and practical arc-line section shape for example, authors explains the design method in detail. Utilizing ObjectARX, software is developed under AUTOCAD environment, the software is object-oriented and adopts design pattern, as a result it is easy to be maintained and extended. It is shown through designing a series of SWATH ships that the method presented by authors is correct and practical.