目前在optistruct以簡單模型設定revolute joint

并給予重力條件進行模擬，但結果會一直錯誤

錯誤為

** ERROR # 153 ***

 Exactly zero pivoting encountered during Numerical Factorization;

 the model may have rigid body mode.

  Solver error no. =   -503 

        spc set id = 3 

             index =      1 

 Possible reasons are:

 1) insufficiently constrained model,

 2) having rigid body mechanisms within the model,

 3) extremely ill-conditioned rigid element sets,

 4) extremely thin shells (as used for skinning) that have MID2/MID3,

 5) gap elements with extremely high stiffness (KA, especially KT or MU).

 Check the model and rerun the problem.

 (MECHCHECK may be used to find the rigid body modes.  To do so,

  change the input to be an eigenvalue analysis and add MECHCHECK.)

 (WARNING: results obtained with MECHCHECK cannot be used because

          the model is changed internally.)

 This error was detected in subroutine bcsmtxfct.

目前在里面joint的設定為圖所示

這邊也想請教MPC和FE實際意義差在哪

目前都是已FE去進行設定

這邊有附上模型(FE)，有去找到有些文章是說這是約束不足

但有假設一些約束條件，這個錯誤還是會出現

8.rar