根據網上金屬軋制視頻教程演化來的三層板軋件輥壓軋制，報錯總是solver pivot warning和One or more bodies may be underconstrained and experiencing rigid body motion. 求解器輸出里也經常出現輥子外表面pilot node 的ROTX的問題“There are 1 small equation solver pivot terms (e.g., at the ROTX degree of freedom of node 20918) which had to be constrained to produce a solution.  This typically indicates a numerically unstable model. Please check your results carefully.  ”請問大神這個模型如果欠約束的話應該如何施加約束比較好？如果約束沒問題的話到底是哪里出了問題？下面是設置

1. 軋輥剛體，軋件柔性體三層板鎂合金/橡膠/鎂合金，軋件層間添加debonding，

2. 軋輥與軋件外表面摩擦接觸，添加增強拉格朗日算法和自動剛度更新，調整為adjust to touch

3. 軋輥外表面添加了body-ground的旋轉副，軋件后端添加一個位移約束釋放x方向的自由度
   

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