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Warrning message - "No usable starting vectors are available; no ritz modes can be found"

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compe_ad

compe_ad

Civil/Environmental
Joined
Apr 20, 2022
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Hi all! I am running into an error message while performing modal analysis using ritz vector. Please see attached image. My model works fine if I switch to eigen vector. Can you please help me understand what is the error here and how can we debug?
Error_jjrh7s.png
Modal_qqvj8m.png
 
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It is defined as shown below. Area load is applied to the slab under SDL load case.
mass_source_p9mvay.png
 
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probably you have some instabilities in your model (ill-conditions), unlike Eigen, Ritz most of the times will not run if there's an instability.
 
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