abaqus同一节点可以同时施加加速度和固定约束吗？ 20

刚自学abaqus，要对模型进行显式动力学分析，想施加一个正弦加速度载荷，但是分析总是出错

想问一下大家是不是加速度载荷和固定约束冲突了，因为加速度载荷我是加在整个模型上的，不知道怎样解决

***ERROR: THIS DEGREE OF FREEDOM HAS BOTH DISPLACEMENT AND ACCELERATION
SPECIFIED. THIS IS NOT ALLOWED. NODE 118 INSTANCE GROUP53 DOF 3
***NOTE: DUE TO AN INPUT ERROR THE ANALYSIS PRE-PROCESSOR HAS BEEN UNABLE TO
INTERPRET SOME DATA. SUBSEQUENT ERRORS MAY BE CAUSED BY THIS OMISSION

***ERROR: TWO BOUNDARY CONDITIONS WITH CONFLICTING DISPLACEMENTS HAVE BEEN
           IDENTIFIED FOR NODE 118 INSTANCE GROUP53 DOF 3. THIS SITUATION MAY
           ALSO OCCUR WHEN BOUNDARY CONDITIONS HAVE BEEN DEFINED FOR A NODE SET
           CONTAINING THIS NODE AND LATER RE-DEFINED USING THE NODE LABEL
           INSTEAD. IF THIS IS THE CASE, PLEASE MAKE THE DEFINITIONS CONSISTENT
           BY USING EITHER THE NODE SET OR NODE LABEL.

载荷加速度ABAQUS

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郑钧 Adam

2021年3月2日

以實體單元為例，主變數是節點上的位移，所以決定位移搭配形狀函數可以得到該單元的位移場分佈，位移場對時間二次導數即是加速度，因此位移就間接決定加速度，如果兩者都給定就會衝突報錯誤。就這個概念，位移跟加速度不能同時設定，必須二擇一。

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北望逸尘

2021年3月1日

你把位移都限制了怎么加加速度呢

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