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Subject: Re: Superelement in ANSYS/Substructuring
Author: Christopher Wright
Date: 2001-01-31 04:03:00

>You may be able to figure out how to get at the superelement matrices. As
>a novice user, the chance of success is not good.
I'm inclined to agree. You can write the matrices off to a file, but I
think it'll take a little fiddling to make any use of them. The
substructure matrices are laid out for running in ANSYS, so there aren't
any guarantees that anything is transportable to another package.

When you do a substructure run you can opt to generate a force vector
which is the equivalent of whatever loads exist when the substructure
gets generated, but all you can do for variable loadings is to scale the
vector. I don't think there's any practical way to apply loads otherwise
except for concentrated forces at master DOF.

I tried something of the sort with a controls guy looking to design a
control system for a flexible robot arm and we got nowhere. Part of the
reason was that neither of us spoke the other's language, but the
substructure matrices aren't supposed to fit anything but ANSYS. I've
been up against some seriously confusing situations, but nothing like the
controls guy trying to explain just what he wanted from the matrix. I did
some fiddling around with mass matrices once when I was going through a
verification exercise and I go a sort of feel for things, so if you're
willing to take the time to do this very carefully you might have a shot.

Christopher Wright P.E. |"They couldn't hit an elephant from
chrisw@s... | this distance" (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)
http://www.skypoint.com/~chrisw

Posts possibly associated with message #20724AuthorDateScore
20651Superelement in ANSYS/Substructuringsbordas@2001/01/30 
20655Re: Superelement in ANSYS/SubstructuringMark Rodamaker2001/01/30 
20659Re: Superelement in ANSYS/SubstructuringK.S. Raghavan2001/01/30-10
20724Re: Superelement in ANSYS/SubstructuringChristopher Wright2001/01/31 
20730Re: Superelement in ANSYS/SubstructuringK.S. Raghavan2001/02/01 
20735Re: Superelement in ANSYS/SubstructuringJason Husband2001/02/01 
20740Re: Superelement in ANSYS/SubstructuringChristopher Wright1991/02/01 
20742Re: Superelement in ANSYS/SubstructuringOsman Buyukisik2001/02/01 
20747Re: Superelement in ANSYS/SubstructuringChristopher Wright1991/02/01 
20768Re: Superelement in ANSYS/SubstructuringK.S. Raghavan2001/02/02 
20783Re: Superelement in ANSYS/SubstructuringChristopher Wright2001/02/02