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Subject: Re: STRUC: Superelement and cyclically symmetric structure - possible?
Author: Marco Perucchi
Date: 2002-10-21 03:51:00

> I'm wondering if it is possible to use a superelement in a modal
> analysis of a cyclically symmetric structure - let's say a gear
drive
> where the model of the driver is a 120ø sector and the driven is
> fully modeled.
> The Ansys manual says that "the basic sector must consist only of
> finite elements; no superelements are allowed" (ch.3.14, structural
> analysis guide), but as far as I understand this, the parts of the
> model which are not "basic sectors" could be superelements.
> Although I tried to build a superelement of the driven, everytime I
> try to issue the cycgen-command, Ansys aborts with the error message
> "Superelement file nnn ... .sub is not available".
> What am I doing wrong, or is it impossible to use superelements in
> the analysis of cyclically symmetric structures?

A cyclically symmetric modal analysis is done with a basic sector and
there is nothing outside this basic sector. Your FE model is
therefore not cyclically symmetric.
I do not think that cyclically symmetric modal analysis is what you
are really looking for. You will have to model both shafts completely.

Marco Perucchi
Delta JS AG
(www.delta-js.ch)
Zurich, Switzerland
Posts possibly associated with message #42874AuthorDateScore
42866STRUC: Superelement and cyclically symmetric structure - possible?Michael Magin2002/10/19 
42874Re: STRUC: Superelement and cyclically symmetric structure - possible?Marco Perucchi2002/10/21 
42876Re: STRUC: Superelement and cyclically symmetric structure - possible?Michael Magin2002/10/21 
42879Re: STRUC: Superelement and cyclically symmetric structure - possible?Marco Perucchi2002/10/21