运用输入输出轴两轴线的向量叉积求出了联轴器夹角方程序。
And then, the expression of the fluctuation of the joint Angle was derived from the cross product of the centerlines of the input and output shafts.
第一单元学得叉积、法向量这些,现在就有用了。
The first unit about cross-products,normal vectors and so on is actually useful now.
为了找到带法向量的面元，我就取这两个的叉积。
To find the surface element together with a normal vector, I would just take the cross-product between these guys.
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