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Subject: Re: STRUC:Substructuring - How may I use super element in a modal analyze?
Author: Dave Johnson
Date: 2003-02-21 08:23:00Valdir,
The main problem I see is an error in the substructure generation:
SEOPT,gen,1,0,0,0
This setting only produced the stiffness matrix of the superelement.
For modal analysis you also need the mass. Use:
SEOPT,gen,2,0,0,0
Also, since the mass reduction is an approximation, I normally allow
ANSYS to pick a few master DOF automatically. In your model, you have
manually selected 1530 master DOF. After that is done I would probably
add this command:
TOTAL,1750
My thought here is to add about 10% more masters, distributed over the
model to give a better distribution of the mass.
David H. Johnson, P.E. Phone: 814-898-6480
Assoc. Prof. of Engr Fax: 814-898-6125
Penn State - Erie URL: http://engr.bd.psu.edu/davej/
School of Engineering & Engineering Technology
Station Road, Erie, PA 16563
Valdir Mendes Cardoso wrote:
> Dear Dave,
> I am really sorry for my unclear description, you are sure is a
submodeling question.
> Regards,
> Valdir Mendes Cardoso
> Support Engineer
> SMARTtech Servicos e Sistemas
> Phone: 55 11 3168 3388 ext. 224
> Av. Brigadeiro Faria Lima, 2894 - 6o andar - CJ 63/64
> cep 01452-438 Sao Paulo - SP