基于NFFD 算法的船体几何变形技术

本文以非均匀有理B样条基函数作为参数体属性,并结合非均匀控制点网格,建立了适用于船体几何的NFFD变形技术。重点阐述了NFFD方法的基本原理和变形规则,并以矩阵表示方法为基础构建了数学模型。研究了控制点数量和分布对变形结果的影响,增加了控制点变形几何的能力并获得了更大的设计空间。最后,以某CNG运输船为例完成了球鼻艏、船艏和船艉部分几何的自动变形。本文的工作为船型优化提供了良好的变形工具。

Research of Hull Geometric Deformation Technique Based on NFFD Algorithm

The NFFD deformation technique is established in this paper based on the non-uniform rational B-spline basis function, which is suitable for the hull geometric and combined with the non-uniform control grid. Fundamental principles and deformation rules of NFFD method is elaborated, and the mathematical model is constructed on the basis of matrix representation. The influence of the number and distribution of control points on the deformation results is studied. The ability to control the geometric deformation of control points is increased and the design space is obtained. Finally, taking CNG transport ship as an example, automatically geometric deformation of bulbous bow, ship bow and stern is achieved. The work of this paper provides a good deformation tool for hull form optimization.