【作者】 吴广宽；

【导师】 梁武科；

【作者基本信息】 西安理工大学 ， 水利水电工程， 2002， 硕士

【摘要】 本文针对水轮机叶片的特点，结合曲面造型技术的研究现状，研究了水轮机叶片的Nurbs曲线曲面造型问题。主要工作有： 第一，完成了叶片与任意平面求交问题的研究，提出分割-迭代-拟合三步求交算法。同时首次应用最小二乘拟合端部法解决了叶片的小区域延展问题。 第二，首次实现混流式水轮机叶片曲面的整体造型。 第三，针对水轮机叶片的特点，完成了各圆柱面叶栅进口安放角的求解算法。 最后，根据以上数学模型，建立了一套基于Nurbs曲线曲面造型理论的水轮机转轮叶片的图形设计软件。 算例结果表明，上述方法不仅可精确拟合混流式、轴流式水轮机转轮叶片，而且还能对叶片进行求交、延展运算并控制精度，实现了Nurbs曲面造型技术应用于水轮机叶片设计和工程实际的预期目标，为水轮机叶片的改型设计和优化设计、水轮机叶片的计算机辅助制造打下了基础。更多还原

【Abstract】 This thesis discusses the problem free-surface modeling technique of turbine blade according to the property of the runner blade and the present research achievement in free-surface modeling technique, the major study concerned are introduced below:Firstly, it accomplished the study of intersection for blade-to-plane and present the method of three-step algorithms such as subdivision > iterative refinements approach ;Meanwhile it solved the problem of small area extend of blade by use minimal modulus method.Secondly, it realized the whole structure of Francis turbine blade surface.Thirdly, it accomplished the computation of blade incidence.The consequence of computation indicated above method not only can approach turbine blade surface accurately but also can be provided for extend and intersection while the precision can be controlled. It realized anticipated goals of the application of turbine blade and engineering exercises. Thus, it provide the foundation to the reconstruct and optimize design of turbine blade as well as the CAM of turbine blade.更多还原