风力机叶片三维线框图的设计和显示

The Design and Display of 3Dblock Diagram of Wind Energy Conversion System Blades

根据风力机叶片设计的实际过程，在三次参数样条曲线拟合叶片翼型曲线的基础上，提出了一种在计算机上能立体显示叶片截面及其结构的程序设计方法。即把叶片截面外形各点的坐标经过旋转变换形成叶片三维线框模型数据，将三维坐标经过投影变换到平面坐标上（称为世界坐标），再将世界坐标变换到设备坐标上，最后通过绘图函数将变换后的数据用图形显示在屏幕上。本研究可为风力机叶片及其它相似复杂形体的计算机绘图提供了依据。

On the basis of blade airfoil curve fitted with triple spline function and the practical process,a kind of program design method is offered to display the section of WECS blades and its structure.Firstly,the data of shapes point of blades are revolved and converted to form the data of 3Dblock diagram of WECS blades.Secondly,the 3D coordinate is projected on the 2D corrdinate (known as the World Coordinate).Then the World Coordinate is transformed to the Device Corordinate.Finally,the varied data are drawn on computer screen by drawing function.In the paper the program design method provides a means to realize WECS blades and other analog complicated structures.