船体曲面的一种光顺重构法  

A fair reconstruction method of hull surface

作　　者：董枫[1] 陈顺怀[1] 

机构地区：[1]武汉理工大学交通学院,湖北武汉430063

出　　处：《哈尔滨工程大学学报》2016年第2期198-204,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金重点资助项目(51039006)

摘　　要：为了在船舶CAD/CAM/CAE中使用更加精确和光顺的船体模型,基于船体型值数据,通过插值或逼近的方式得到常规站线以及广义站线的NURBS表达式。在得到了这些曲线以后,通过等数弧长均分的方式在这些曲线上取数目相同的数据点,构成所谓的广义型值点,对这些广义型值点进行插值重构来得到一致化的常规站线以及广义站线,这些曲线共同构成生成船体曲面的截面曲线。将这些截面曲线取为曲面的u向等参数线,采用改进的曲面放样方法得到整个船体曲面。结果表明:重构的船体曲面能够具有较好的拟合精度和光顺性。In order to use more accurate and fair hull model in ship CAD / CAM / CAE system,based on the hull offset data,the NURBS representation of the conventional station ordinates and generalized station ordinates are obtained by interpolation or approximation method. After obtaining these curves,the same number of data points is sampled from these curves by dividing its arc length equally,so as to form generalized offset points. By interpolation of these generalized offset points,compatible conventional station ordinates and generalized station ordinates are reconstructed,and these curves together constitute the cross-section curves of the hull surface. These cross-section curves are taken as u-direction isoparametric curves of hull surface. By using improved surface lofting method,the whole hull surface is gotten. From the results,it can be seen that the reconstructed hull surface has good fitting accuracy and fairness.

关 键 词：插值 逼近 重构 广义站线 等数弧长均分 改进放样 

分 类 号：U662.2[交通运输工程—船舶及航道工程]