# 3.8.8: 主要状态转型 (Principal States Transformation) 🔷

使用**“Principal States Transformation（主要状态转换）”**运算器，用户可以通过第一和第二主矢量**“Vec1”**和**“Vec2”**定义张量，并获得给定方向**“DirX”**的运算器。例如，这允许计算垂直于**“DirX”**断面的壳体的弯矩或平面力。**“N”**则用来指定执行转型之前将**“Vec1”**和**“Vec2”**投影到平面上的法线方向。


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