仿真时出现的错误，求助

hbhenry

$ Warning (Code 1950011)

        The eccentricity (  1535.3) of the computed reference node (181551) is larger than 1% of
        the maximum eccentricity of all nodes (  1841.4). The eccentricity calculation
        already considers an internal shift of the node geometry by (  1880.4, 0.61586E-03, 0.85577E-03).
       
        Check the definition of the reference node.




$ Warning (Code 3940002)

        Pivot coefficient (element (2,2)) is less than zero or
        loss of digits happened (  0.0000).
       
        This may cause numerical problems in factorisation.

$ Error (Code 3240005)

        Body Block:
       
        The effective stiffness matrix is not positive definit or the loss
        of significant digits is higher than 6 digits during the factorization.
       
        User action: (1) Check the bodies stiffness and mass properties as well
                         as the defined integration parameters.
                     (2) Check the animation of the body.

$ EXCITE-7.0 - terminated abnormally!

$ FLEXlm Info: checking out license excite_crankshaft 7.0

DrLan

问题太多了：
1、节点坐标系位置不精准，两个多体的耦合点没对齐。
2、单元质量差，可能是雅克比小于零。
3、rbe2等没有设定好，导致矩阵非正定。

hbhenry

回复 2# DrLan

谢谢蓝博士，问题解决了