Use of Residual Vectors in SuperElement creation

[Rhei]

Hello,

after reading this thread Link I have a question about the use of residual vectors in superelements generation.
Can the use of residual vectors replace the need of including too many high frequency modes during the condensation run?

What I mean is: let's assume I have a structure which is excited in the frequency range 0-100Hz and I want to make the SE of this structure. To do that I would use modes up to 200Hz in the condensation run.
If I use residual vectors, can I reduce the number of modes up to, for example, 120 Hz? Or should I keep the original frequency range (200 Hz) and add the residual vectors to that set of modes?

Thank you

 

[FSB1]

Hi

you want to use RESVEC instead of including the number of modes up to 200Hz, while specifying maximum frequency as 120Hz.

You can do that, however there's probably no advantage on that, unless RESVEC catches modes beyond 200Hz, but you can include that as you were probably doing for 0-200Hz range.
Remember freq range until 120Hz with RESVEC could only catch you modes till 160Hz for example, leading to a less accurate result. You have to check how many modes you catch with resvec for your desired frequency range, after running the condensation.