26. Visualising the forced vibration response

Multi-Degree of Freedom Dynamics
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Questions and discussion for this lecture live here. Fire away by hitting Reply below :fire:

2

Hello Dr. Sean,
I changed force frequency to 24 and also applied a force on mass 2. By this changes, the direct integrate method and modal superposition get some discrepancy. why there is discrepancy?

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image
image1535×531 116 KB

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Mode three with force on M3
Mode three with force on M31185×375 183 KB

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Hi @joejavady,

I’m afraid it’s not clear to me what you have tried to do. Can you please elaborate?

Thanks,
Seán

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@Sean ,

  1. How are you generating the shear building frame and MDOF idealization images? Could you share the native file - I would like to customize the images for n floors.
  2. I am getting animation errors, using jupyter lab. The image plots but not playing:

Screenshot 2024-04-26 050502
Screenshot 2024-04-26 0505021492×564 19.7 KB

Thanks,

RA