How to extract the first 6 major mass participation factor modes and create a .gif using pydpf

Karthick RAJAN

To extract the first 6 major mass participation factor modes and create a .gif using pydpf with 50x animation scale factor when .rst file is provided

Pernelle Marone-Hitz

Hi @Karthick RAJAN , the purpose of this forum is not to provide fully developed script, but help users develop their own scripts. Please have a look at the PyDPF documentation, I believe this example is almost exactly what you are trying to do: https://dpf.docs.pyansys.com/version/stable/examples/02-modal_analyses/01-plot_and_animate_modes.html

Karthick RAJAN

Hello @Pernelle Marone-Hitz, I have gone through these examples indeed before posting it. While going through, I had few queries

from ansys.dpf.core import operators as ops, animation
import ansys.dpf.core as dpf

def ModeShapeExtraction(model):
model = dpf.Model(model)
print(model.metadata.result_info)
# Extract the displacement results which define mode shapes
disp = model.results.displacement.on_all_time_freqs.eval()
userinput = int(input("Enter the number of modes you want to animate: "))
for i in range(userinput):
animation.animate_mode(disp, mode_number=i+1,save_as=f"Mode_{i+1}.gif", off_screen=True, deform_scale_factor=50.0)
print(f"Mode_{i+1} extracted_successfully")

inputpath = input("Enter the path of the result file : ")
ModeShapeExtraction(inputpath.strip('"'))

1. Deform scale factor is not working even after assigning some values
2. Can we able to access Mass Participation factor in .rst from the outputs we get from dpf once it loads? because under available results, we dont have the option directly

Pernelle Marone-Hitz

Hello @Karthick RAJAN , with these specific questions, we can help.

• If the deform scale factor of animate_mode() is not working, please report this as an issue in Github. You can do this directly from the forum by clicking here:
  
  (I quickly tested this and saw the same problem)

• For mass participation factor, please read this post: https://discuss.ansys.com/discussion/762/how-can-i-extract-participation-factors-of-a-modal-analysis . An operator was recently introduced to read modal participation factors from the mode file:
  ansys.dpf.core.operators.result.spectrum_data.spectrum_data

Karthick RAJAN

Hello @Pernelle Marone-Hitz Thank you for the response.

I could be able to get Mass participation factor after adding the .mode file along with .rst.
But I still face the issue of not getting the animation scale factor in the output .gif file.

The animation file countour changes, but there is no deformation/warping of nodes

@Rajesh Meena , @Ayush Kumar Could you please help me on this!

Pernelle Marone-Hitz

@Karthick RAJAN As mentioned, I believe the issue with the animation is a bug, please report it on Github.

Rajesh Meena

@Karthick RAJAN @Pernelle Marone-Hitz For issue with animation gif file, This issue have been reported in the past as well ( #1032, #1644 ). I fixed this issue last year myself with this PR but not sure why this is not merged in pydpf yet. I will check that.