Simple Question :Frequency Extraction Step ->Modal dynamics

[ptsal]

Hi guys,
I have a simple question.

I'm doing a Modal dynamics analysis in Abaqus. I wouldn't remember to ask this if I had a small model, however thats not the case. Only the frequency extraction step takes up to a hour and a half and the rest depends on the time increment that I define. So my question is, if all my BC's remain the same and I want to do different modal analysis, is there any way to jump the step of frequency extraction and go directly to the modal dynamic step?
This because since there is no change in the model and BC's why should I always go through the extraction step if the information is exactly the same?
Is it possible?

I hope I made my self clear,
any help to overcome this issue would be very usefull.

Thanks in advance.

 

[burningDiesel]

yep there is!
in the keyword manual, check for *restart analysis
at the top of that page are the relevant links to the CAE and user manual.

You have to make 2 jobs out of it, job 1 ends with a *restart, write

job 2 starts with *restart, read
you only need to specify the step data, and run job 2 from the same folder as job 1 (as you will need the output from job 1)

in short:
If you use keywords: take your input file, just before the modal dynamics *step, type *restart, read and cut all that is underneath.
make a new input file, type *restart, read and paste all you cut before.
in CAE:
“Restarting an analysis,” Section 18.5 of the Abaqus/CAE User's Manual

 

[ptsal]

Before all, thank you very much.

I've read about the restart keyword before, but I didn't connect the dot's. :S

I'll try that tomorrow.

Again, thank you! You saved me lot's of time.