ansys求解時遇到個問題，求指教

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   Dos窗口顯示錯誤為：A small negative equation solver pivot term has been encountered at UZ degree of freedom of node 1153.Check for an insufficiently constrained model.
9 T" |9 a, h8 P6 k求高人能指教一下，怎么解決，是不是約束沒弄好啊？