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Base excitation is not working correctly in the time-history response analysis.

- September 30, 2025 at 5:35 am
  
  22ek075
  Subscriber
  
  Message This analysis was performed using modal analysis with the mode superposition method, and the acceleration is applied in the vertical (up–down) direction. The model should be fixed, but the entire structure moves (see the photos below). As a result, the expected response waveform is not obtained. What can be done to fix this? I would appreciate any advice.
  Analysis Settings（Input）
  fixed surface
  Result（Output）
- September 30, 2025 at 11:23 am
  
  peteroznewman
  Subscriber
  
  You get different displacement results for Base Excitation of a Transient Structural depending on whether you set Absolute to Yes or No.
  Read this discussion for an in-depth explaination: https://innovationspace.ansys.com/forum/forums/topic/base-excitation-absolute-result/
- September 30, 2025 at 11:33 am
  
  22ek075
  Subscriber
  
  Thank you. I'll give it a try.

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