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Subject: Re: STRUC: Superelement and cyclically symmetric structure - possible?
Author: Marco Perucchi
Date: 2002-10-21 05:46:00

> I should have been more precise in my previous post.
> Although the Ansys manual (ch. 3.14) displays only one basic sector,
> I found it possible to build a model as described in my previous
> post. I should have added that the model consists of one driver and
> three drivens, 120 ø apart (a planetary gear), so I modeled only a
> 120ø sector of the driver and one (complete) driven, entirely made
> of Solid73. The results are fine, an EXPAND gives me a view of the
> complete driver with 3 drivens.
> Now I'd like to replace the drivens by Superelements (Matrix50), but
> Ansys aborts the analysis with the mentioned error
> message:"Superelement file nnn ... .sub is not available".

It was not clear to me that you were talking about a planetary gear
with three planets. In this case one complete planet wheel is a part
of the basic sector with 120ø sector angle. The fact that the planet
as a part of the FE model does not have cutting edges does not mean
it is something outside of the basic sector. I presume in your model
the planet is connected to the centre wheel via CE, CP, springs or
beams.
As soon as you include all planets (wether as normal models or
superelements) you no longer have a cyclic symmetric FE model and you
have to model the complete centre wheel.
So the point is: Either you have a cyclically symmetric model (and
can't use superelements) or you don't have. There is nothing in
between.

BTW, consider replacing the SOLID73 with SOLID92.

Marco Perucchi
Delta JS AG
(www.delta-js.ch)
Zurich, Switzerland
Posts possibly associated with message #42879AuthorDateScore
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