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"Inadequate Spectral lines" in the Response Simulation Module

To all,

 

This might not be the best place to ask the question but I have to start somewhere!

 

I have been trying to create/calculate the RMS stress result in the response simulation module with a "large" number of elements (~5500 shell mostly) and I am getting an ''Inadequate spectral line spacing' error, see attached. Changing the evaluation method as suggested in pop-up window makes no difference. It was initially set to "Automatic" so expected Nx to swith to the appropriate method but to no avail. It's not working!

 

So a couple of questions;

Q1: Does anyone know what is causing this issue?

Q2: What is 'spectral line spacing' ?

 

Thanks

Regards

Production: NX9.0.3.4, NX10.0.2.6
Development: VB.NET (amateur level !)