请教:adnia中用truss单元后出的问题,如何解决?
STIFFNESS MATRIX NOT POSITIVE DEFINITE ***NODE= 12014 EQUATION= 24690DOF= X-TRANSLATIONPIVOT=0.00000000E+00
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NODE= 12097 EQUATION= 24939DOF= X-TRANSLATIONPIVOT=0.00000000E+00 有0特征值,
可能是边界或单元的连接问题。
0特征值如何让解决?
0特征值如何让解决?jacobi给指点怎麽查找边界和单元连接的问题?
0特征值如何让解决?
0特征值如何让解决?jacobi给指点怎麽查找边界和单元连接的问题? 查看一下又没有rigid body displacement. 是模型的问题
建立的模型形成的刚度矩阵行列式不得零 我以前用truss也这样,但是我把它固定约束住,就好了。说到底还是模型不稳定 一个实际杆就定义truss单元,可以解决上述问题。具体可以参考校验手册中的悬索桥的分析实例。 adina中的truss element 是不能划分多份的,
比如,ab两点间,有一根桁架连接,模拟时,仅能用一个truss element 模拟,
实事也是这样,不然系统就会成为活动的机构,
这个在其他软件ansys里面是不检查的。 很有可能是边界条件的问题,包括刚度矩阵不稳定,或者设置刚性连接和弹性连接时出的问题。以前本人也遇到过这样的问题。
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