Effective mass of the frequency analysis shows more than the model mass 1

[kumara123]

Hi,
I ran a frequency analysis in Abaqus to find the first natural frequency and frequency related 95% model mass. The obtained participation factors are very much low and also effective mass (e.g - 6.74E9) for the rotation components are larger than the total mass of the model (4.27E7). Can anyone explain this to me, please? the .dat file is attached here.
Thank you.

 

[Mustaine3]

I think the rotational components can be ignored. They are highly dependent on the location of the part and have no real meaning.

 

[kumara123]

Hi, Thanks for your reply. I 'll ignore that part. But I have a problem with obtaining frequency related to 95% model mass.
I extracted 30 modes and participation factors are added together, the values are very low (e.g. 1.5, 2.3 and 2.0 for three components). Should I want to extract more modes (until I get the summation of 95) to find model mass related with 95% model mass? please find the attachment of the participation factors.

Thank You