特征驱动的T样条船体曲面参数化设计方法研究

为提高船体曲面生成和修改的便捷性、灵活性,提高船型优化设计效率,并且克服NURBS曲面表征船体曲面的一些不足,提出一种基于T样条技术的船体曲面参数化设计方法.将船体曲面特征参数分为全局、船首、船中和船尾4组,依据这些参数建立T样条控制网格,用单一的T样条曲面即可完成船体曲面和局部特征造型,大大减少了控制点数量.通过特征参数直接驱动船体曲面调整,使船型修改变得直观和简便,且更具有针对性.以典型水面舰船船体曲面表征为例,说明所提方法在船体曲面造型及修改方面的能力和优势,该方法可大大提高船型优化设计效率,具有较大的理论意义和实用价值.

Feature-driven modify and parametric design of ship hull with T-spline surface

In order to improve the convenience and flexibility of hull surface generation and modification, and improve the efficiency of hull form optimization design, a method of parametric design based on T-spline technique has been pro-posed, which could also overcome some shortcomings of NURBS surface representation. The parameters of hull surface were divided into four groups as global, bow, mid-ship and stern, according to which a T-spline control grid (T-Mesh) was established. Single T-spline surface can be used to complete the hull surface and local feature modeling, greatly reducing the number of control points. By using the feature parameters, the hull surface adjustment could be directly driven, so the ship hull modification is easy and intuitive. A typical surface ship hull representation and modification has been taken as an ex-ample to verify that the proposed method could greatly improve the efficiency of hull form design and modification, and has great theoretical significance and practical value.