How to extract full modal damping table using pydpf?

I'm trying to extract modal damping data from a result file using PyDPF.
I was able to get frequencies using metadata.time_freq_support.
However, I also want to get the following data shown in the Ansys Modal Analysis table:

Damped frequency
Stability
Modal damping ratio
Logarithmic decrement
Is there any way to extract all of these using PyDPF?

If not directly available, is there a way to compute them using PyDPF operators?

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Comments

James Derrick

Hi @Gopi Raju Velpula I am not sure if I can answer your question but I hope someone in the @Structures-Scripting-Team might be able to help!

There is a TabularData command under Solution that will extract the tabular data from your damped modal analysis.

analysis_number = 0
solution = ExtAPI.DataModel.Project.Model.Analyses[analysis_number].Solution
data = solution.TabularData

Gopi Raju Velpula

Thanks for your replay, iam trying to extract these tabular data by using PyDPF this script is looking like mechanical script, is it possible extract the same using pydpf script?

Pernelle Marone-Hitz

@Ayush Kumar do you perhaps have an example you could share ?

Ayush Kumar

@Gopi Raju Velpula you can get Stability with the following code, others I am not sure if they are supported yet.

model = dpf.Model(rst)
# Complex frequencies / Stability
stability = model.metadata.time_freq_support.complex_frequencies
print(stability.data)

Ayush Kumar

@Gopi Raju Velpula Modal Damping Ratio and Log Decrement can be calculated easily from Damped Eigenfrequency and Stability using equations mentioned in the Ansys Help link below.

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v252/en/ans_thry/thy_tool13.html#eltcomplexeigens