Good morning,
I have problem with Fixpoints on pipes, when I do calculation with earthquake static case and earthquake dynamic case, the dynamic calculation is canceled.
Here are the error messages:
Could you explain me where is the problem and could you give me some procedure for solving.
Thanks
Error in dynamic EQ calculation
- r2user
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- Registriert: Mi 14. Sep 2011, 10:18
Error in dynamic EQ calculation
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- rohr2support
- Beiträge: 457
- Registriert: Mi 14. Sep 2011, 08:23
Re: Error in dynamic EQ calculation
Hi
The problem is that there are no eigenvalues up to the cutoff frequency of 25 Hz. The first eigenvalue of this system is at 58Hz.
If you want to do a dynamic analysis you should at least have enough eigenvalues so that you can see how most of
your mass is oscillating. Or if your system is very stiff (as in your case) you can just make a static analysis.
If you change the max cutoff frequency in the ROHR2 task in the load case Eigenvalue to 100Hz it works.
Best regards
The problem is that there are no eigenvalues up to the cutoff frequency of 25 Hz. The first eigenvalue of this system is at 58Hz.
If you want to do a dynamic analysis you should at least have enough eigenvalues so that you can see how most of
your mass is oscillating. Or if your system is very stiff (as in your case) you can just make a static analysis.
If you change the max cutoff frequency in the ROHR2 task in the load case Eigenvalue to 100Hz it works.
Best regards