Modal Mass - Ansys

[ruchidave02]

I am solving a problem where I am doing a modal analysis which is normalised to Mass Matrix method. Can anybody please tell me how do I find the modal masses assigned to first 8 modes?

 

[Drej]

Am guessing here, but I think what you're after is the modal mass participation for each mode/direction. This information is given in the output file which, by default is only sent to thte output window and isn't saved in a file. You need to switch the output to a file prior to solve. To do this, just use the /output command and then solve. For example:

/output,output,out
solv
/out

Look in the output.out file and your modal mass participation will be in here for each mode.


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[ruchidave02]

Thanks Drej. It worked.

 

[ruchidave02]

It apears that in the output file, the values for the masses are for each direction(X Y Z translation and rotation). Total 6 for each mode. But I want one value of the mass for each mode. Meaning, 8 values for 8 modes. Can anyone please guide me?
Thanks.

 

[Drej]

Then just sum the directional masses for each mode in turn (mode 1 X-direction mass + mode 1 Y-direction + mode 1 Z-direction). Why do you need this?


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[cbrn]

Hi,
as Drej says, why do you need this?
It appears to me to be unphysical, and that looking for the "most overall dangerous mode" like this could be misleading... Am I wrong?

Regards