Error#3086 in optistruct

Altair Forum User

Hello,

 

I want to get a mnf file in HM13.0. But there is an error as following:

 

 *** ERROR # 3806 ***
  Eigenvalue calculation is used in CMS analysis, but there is no mass
  associated with the whole model, which prevents the eigenvalue analysis.

 

Could anyone please tell me what i should do to avoid this error?

 

Thanks a lot.

 

Momiji

Altair Forum User

Hi Momiji,

 

Can you check whether density is furnished in Material card(s)?

 

Mass calculation will be zero if no density is available in material card and mass is required for dynamic analysis.