AVL excite报错，大家帮忙看一下！

lilianying

excite报错，大家帮忙看一下！
$ Warning (Code 1920021)

Lumped mass matrix (data block >MFF<) offending modeling guidlines.
Element outside 3x3 diagonal block for inertia tensor encountered.
The error occurred at column 23751 which corresponds to node 91200,local degree of freedom 6.
Mass offsets will not be considered in the simulation.
        User action: (1) Check the data block.
                           (2) Check whether the data block and the table of degrees of freedom are consistent.


$ Warning (Code 1920020)
Lumped mass matrix (data block >MFF<) offending modeling guidlines.

Off-diagonal element encountered at column 23752.
This columncorresponds to node 91300, local degree of freedom 1.
The off-diagonal element (within the 6x6 nodal mass matrix)with maximum absolute value (relative index 5) is -0.38387E-07
The diagonal element is   0.91862E-07 The ratio off-diagonal/diagonal  -0.41788 Mass offsets will not be considered in the simulation.
User action: (1) Check the data block.
             (2) Check whether the data block and the table of
                   degrees of freedom are consistent.
              (3) Check whether rigid body couplings induce a
                   mass offset at the independent grid point.

mengmianren

警告，没事。质量矩阵不太好。

lidenghui

我想问问如果要想得到比较好的质量矩阵，在画网格的时候应该注意那些方面？

大洪

雅克比不能太小是很重要的，

feicheng

我用的是rbe2单元建立了约占轴颈面积30%的刚性区域，是使用这种单元的问题？

guangmingqian

rbe2的使用与刚度矩阵有关。