Modal/seismic analysis problem:missing eigenvalues

[dan.suciu488718]

Hi,
First of all I apologize if this problem has bein postet before, but I could not find a result for it.
I am trying to do a modal analysis on my Bachelor's project, on which I want the results only on X&Y;
after setting everithing, I runnedd the calculations in order to see in which mode participates the most mass, and I encounter this error:
Number of missing eigenvalues found = 2
the error repeats itself in several cases before the calculations are done.
I do not know how to solve it, and I think I did the steps for modal analysis wright.
Any help or suggestions would be greatly appreciated.
With regards,
Dan,Suciu

[kmarsh]

This is partially a function of the calculation method you are using for the modal analysis and quite frankly, is a bit beyond me as well. (and I'm probably not alone based on the number of responses)
You can read more in depth about this here:
http://docs.autodesk.com/RSA/2013/EN...%7Ceigenvalues
Specifically in Block Subspace Iteration Method

Would be interested to hear other feedback on this one, it's new to me as well.
-Ken