Free-Free Modal Analysis Discovery Live

Free-Free Modal Analysis Discovery Live – Large Assembly

- June 3, 2020 at 10:13 am
  
  stefan.kuenzli
  Subscriber
  
  Hello
  
  I have a problem with a large assembly, where I would like to do a Free-Free Modal analysis.
  
  2020 R1
  
  I only want to analyse a sub-assembly from the whole assembly. Therefore, I just defined the desired bodies as Simulation Bodies. I get wrong results (3.63e-2 Hz / rigid body modes).
  
  However, if I delete the unneeded bodies, I get correct results (15.6 Hz).
  
  In Discovery 2019 R3 I get the correct results in both cases.
  
  Can you please have a look into this behavior? If needed I can provide the geometry files (not publicly)
  
  Thanks Best regards
  
  Stefan
- June 3, 2020 at 11:40 am
  
  Subashni Ravichandran
  Ansys Employee
  
  Hello skuenzli
  
  I'm unable to reproduce this on an arbitrary assembly. Could you please share your model with us?.
  
  I have shared an Ansys Secure Transfer link to you via email. Please use the link to securely transfer the files to us.
- June 26, 2020 at 7:48 am
  
  stefan.kuenzli
  Subscriber
  
  Hi Subashni
  
  I sent you the files. Were you able to reproduce the behavior?
  
  Best regards
- June 26, 2020 at 8:36 am
  
  Naresh Patre
  Ansys Employee
  
  Hello skuenzli
  
  Subashni is on sick leave for a couple of weeks. Will it be possible for you to send the file again? I will send you a new secure transfer link. Apologies for the inconvenience and delay.
- June 29, 2020 at 8:03 am
  
  Naresh Patre
  Ansys Employee
  
  Hello skuenzli
  
  Thanks for sending the files. It appears to be an issue with this model in 2020R1. However, I tested in the upcoming 2020R2 and couldn't reproduce the issue. So it looks like the issue has been fixed in the upcoming version.
- June 29, 2020 at 10:04 am
  
  stefan.kuenzli
  Subscriber
  
  Hi Naresh
  Thanks very much for your investigetion and good to know that it is not an issue in the upcoming version.
  
  Best regards
  
  Stefan

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