薄板冲压principal inertia问题

niexinpiero · 发表于 2006-8-1 16:51:14

本帖最后由 gdyu_yu 于 2010-8-27 00:35 编辑

我在计算薄板冲压时，出现这个提示，这是怎么回事，
*** Warning rigid body number=    6 has a principal inertia
         at least 4 orders of magnitude apart:
            min=    0.2368E-02
            max=    0.7160E+01
         the min is scaled to 5% of the maximum
*** Number of warning messages for rigid bodies
   Have a principal inertia at least 4 orders of magnitude apart=    1
   2-noded nodal rigid body is deleted due to massless node    =    0
   Nodal rigid body deleted due to null inertia tensor       =    0

刚体6的主惯性最大值和最小值相差太大？？？
这是为什么阿。怎么样解决呢，同志们有碰到过这种情况不？

niexinpiero · 发表于 2006-8-3 09:12:53

为什么没人回答阿。帮忙看看阿。谢谢了。

sonake · 发表于 2007-7-30 20:14:24

I guess that your nodes of the nodal rigid body are lying on a line or almost on a line. If so, a rigid body composed of those aligned nodes with its specific nodal masses has an principal inertia about this axis of zero or almost zero as in your case. Instead the other principal intertias will be much higher. As a matter of numerical stability LS-DYNA increases the pricipal intertia about this axis. The influence in that case should be marginal.

tbve · 发表于 2011-11-4 18:17:52

sonake 发表于 2007-7-30 20:14
I guess that your nodes of the nodal rigid body are lying on a line or almost on a line. If so, a ri ...

大哥不太明白啊

翔鸿飞雀 · 发表于 2016-3-23 00:16:14

问题解决了没有~分享下经验呗

woyong · 发表于 2017-4-21 18:52:35

你是冲压成一个流道槽么？

z_mj_2005 · 发表于 2021-9-6 13:20:30

问题解决了吗？

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[错误和警告信息] 薄板冲压principal inertia问题

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