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Hello everyone,

 

I'm trying to set up a direct transient analysis of the beam you see in the picture below (simplified geometry):

  • The beam is meshed with tetra elements.
  • On top the beam is constrained in all dof.
  • In the middle of the beam is a hump and the mass of it has an influence on the eigenfrequency of the beam.
  • At the lower end of the beam a periodically enforced displacement in the range of the eigenfrequency (3 kHz < f < 4 kHz) of the beam is applied.

FEM_Doku.thumb.jpg.70714de2da4bd83d284f8bfdbc5ccb5f.jpg

With the FE analysis I want to get information about the following questions:

  1. What is the stress at the top of the beam? Later I would like to get information about fatigue.
  2. What is the eigefrequency of the beam?
  3. What is the exact displacement of the hump in the middle of the beam when a certain displacement is applied at the lower end with its eigenfrequency?

 

So far I've tried to adapt the tutorial "OS-T: 1310 Direct Transient Dynamic Analysis of a BracketOS" to my purposes but I have problems with applying the periodically enforced displacement. Can someone tell me what the best way is to realize this problem with optistruct?

 

Thank you in advance

Felix

 

Link to the tutorial:

https://altairhyperworks.com/hwhelp/Altair/2017/help/os/topics/solvers/direct_transient_dynamic_anlaysis_bracket_r.htm#direct_transient_dynamic_anlaysis_bracket_r

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