[数学][几何] 阿基米德螺旋线 (等速螺旋线) [Archimedes’ spiral]

实干、实践、积累、思考、创新。


阿基米德螺线(亦称等速螺线)(Archimedean spiral),得名于公元前三世纪希腊数学家阿基米德。阿基米德螺线是一个点匀速离开一个固定点的同时又以固定的角速度绕该固定点转动而产生的轨迹。更多的介绍可以参见:阿基米德螺旋线百度百科词条

简单的说阿基米德螺线可以用极坐标表示为:

r = a+b*θ;

其中其中 a 和 b 均为实数,θ为转角。当θ=0时,a为起点到极坐标原点的距离,b为螺旋线每增加单位角度r随之对应增加的数值。

我们可以通过以下公式将极坐标转换为笛卡尔坐标:

x = (a+b*θ)*cos(θ);

y = (a+b*θ)*sin(θ);

于是就可以非常简单画出图形了,废话不多说,我们用EXCEL来作图。

以下是b=0情况下, a=0及a=1000 时的螺旋线:

以下是a=0情况下, b=10及b=15时的螺旋线:

 

最后我们可以把曲线导入之前的编写的 GAAGM软件 [软件][工具][编程] GAAGM: Graph Animation and Animated Gif Maker [曲线图动画及Gif动图生成工具],制作漂亮的曲线动图。

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