船体线型计算机辅助设计(CAD)

CAD for Hull Lines Design

讨论了船体线型CAD中的数值方法和实施过程;按几何曲线光顾准则,提出了符合特征和控制要求修改型值的改进上下限法;给出了适用于大挠度型线数学光顺的分段三次参数样条迭代法.这些方法无论是对水线,还是对船艏、船艉型线都有很好的数学光顺效果.文中还提出了人机互助修改相对差分符号表的方法,该方法在三相光顺实施中是实用有效的.

A numerical method and its procedures in CAD for hull lines design are briefly described. By the fairing principles for geometric curves, the relative second order difference in accordance with control requirements on the geometric features and an improved upper and lower bounds method for offsets modification are presented. An iterative method with cubicparameter spline applicable to mathematical fairing for lines with a large deflection is given.Satisfactory results concerning mathematical fairing have been found not only for waterlines,but also for fore and aft lines. A method useful to modifying the symbol table of the relative second order difference with man-machine interaction is also presented.