Participation factors after Modal Analysis
Participation factors after Modal Analysis
(OP)
Hello,
is there a possibility to get the participation factors of mode N after a modal analysis in all directions? I found something in the ansys help, by using
*GET, Par, MODE, N, PFACT
but only for ROTZ...
Why? How can I get it for UX for example? After a modal analysis, the output contains all mass participation factors for all 6 directions.
Thanks!
Alex
is there a possibility to get the participation factors of mode N after a modal analysis in all directions? I found something in the ansys help, by using
*GET, Par, MODE, N, PFACT
but only for ROTZ...
Why? How can I get it for UX for example? After a modal analysis, the output contains all mass participation factors for all 6 directions.
Thanks!
Alex





RE: Participation factors after Modal Analysis
I'm out of the office so I cannot verify this but I think if you issue
OUTRES,ALL,ALL
before SOLVE this will output the information you desire. I'd recommend you verify this however.
Best,
-Brian
RE: Participation factors after Modal Analysis
*get,par,mode,n,pfact
this gives you the participation factor for mode n. If you square this value it will give you the effective mass for that mode, direction-independent.
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RE: Participation factors after Modal Analysis
I'd suggest you redirect the output to file prior of doing the solution:
/OUITPUT,file,ext,
and then reset it to the Ouput Window afterwards:
/OUTPUT,,,
Regards
RE: Participation factors after Modal Analysis
With your help I know now a little bit more about modal mass and participation factors.
But I still have one problem: I wanted something like a *get function for automatically reading the modal mass for a specified DOF in to a variable. I need this for some user defined optimization routine.
Writing a program for getting the information from the output file would be too complicated if not impossible with APDL.
Interesting is that Ansys accepts one more keyword for the *get command
*GET, Par, MODE, N, PFACT
That's the DOF: UX, UY,... ROTZ
So I can input for example
*GET, Par, MODE, N, PFACT, UY
But I get always the same value. If I input a wrong keyword,
*GET, Par, MODE, N, PFACT, WrongKeyWord
then I get an Error Message. But not if I input UX, UY, UZ, ROTX, ROTY, ROTZ.
Is this a still not documented and still not working function of Ansys?
Regards,
Alex