频率响应求解出错 ERROR # 153，求指点
在模态分析中，是没有问题的，求解的结果也基本可以。可是在直接法频率响应中，在求解过程中出现这个错误，求大神指点如何解决？*** ERROR #153 ***
Exactly zero pivoting encountered during Numerical Factorization;
the model may have rigid body mode.
Solver error no. = -503
spc set id = 3
index = 1
Possible reasons are:
1) insufficiently constrained model,
2) having rigid body mechanisms within the model,
3) extremely ill-conditioned rigid element sets,
4) extremely thin shells (as used for"skinning") that have MID2/MID3,
5) gap elements with extremely high stiffness (KA, especially KT or MU).
Check the model and rerun the problem.
(MECHCHECK may be used to find the rigid body modes.To do so,
change the input to be an eigenvalue analysis and add MECHCHECK.)
(WARNING: results obtained with MECHCHECK cannot be used because
the model is changed internally.)
This error was detected in subroutine ddlslv.
This error occurs in module "dfrfdrv".
*** FATAL ERROR # 8012 ***
Data block kauspc is already inserted. 有可能是壳单元的厚度未设置，我的就是这样，百度上有一回答是说有部件未连接上。其他的原因暂时也不知道了。
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