XANSYS Message: 45010 [Go back to message list] [bookmark on del.icio.us]
No rating yet Subject: Re: [STRUCT] substructuring and modal analysis Author: Bogdan Balasa Date: 2003-01-07 05:27:00As far as I remember, at an earlier version everything worked OK for modal analysis. You should check your steps carefully, as well as matrices generated during the generation phase. Make sure you specify mass matrix also.
As far as I know, ANSYS uses static (or Guyan) condensation. Other condensation methods are not available directly, only through UPF. Consequently although the stiffness condensed matrix is always correct, the condensed mass matrix will depend heavily on the distribution of the Master nodes.
Regards.
Bogdan Balasa General Manager INAS SA 1 Tehnicii Street, 1100 Craiova, Dolj, Romania Phone: ++40 251 438 789 Fax: ++40 251 438 906 Email: bbalasa@i... WWW: www.inas.ro
----- Original Message ----- To: Sent: Tuesday, January 07, 2003 12:06 PM
> Dear All,
> I have a model with superelement (MATRIX50). > A static analysis works well; generation, use pass and expansion give > good results.
> Actually, in a modal analys both generation and use pass are ok but no > results are avalaible during expansion phase. > Probably, I missed something ...
> Moreover, Is it possible to perform Craig-Bampton condensation using > MATRIX50 ?