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Hyperworks进行optistruct计算后，出现柔度值为负的现象，这应该怎么解决？
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*** ERROR # 312 ***
In static load case 1
the compliance is negative or large -1229.72.
Optimization/buckling analysis cannot be performed.
due to possible rigid body mode.
FEASIBLE DESIGN (ALL CONSTRAINTS SATISFIED).
*** SOME ERRORS WERE REPORTED DURING THE RUN,
*** PLEASE VERIFY RESULTS AS THEY MAY BE INVALID.
...
这是哪里的问题？
TechmanLXS 
