General Mechanical

General Mechanical

Avionic Hold-Down FEA modeling

    • Lavido
      Subscriber

      Hello, I am trying to model a FEA version of hold-down (see example in the URL). The FEA is for modal analysis and Random analysis. 

      As I want to calibrate the model to the real structure (test on a shaker with accelerometers), the hold-downs are not acting linear - as the vibration level rise, the natural freq is going down.

      Does anyone have past-experience with the modeling this "guys"?

      Thank you very much.


      endobj 291 0 obj >/Filter/FlateDecode/ID[]/Index[262 55]/Info 261 0 R/Length 130/Prev 1482489/Root 263 0 R/Size 317/Type/XRef/W[1 3 1]>>stream h?bbd```b``~"?A$??? ,? D ??{A??(X}XD L~??? ???/?&????_????1?Dr???!`s????@?J8??8"eˁ??&Fƙ`]???????? ? ??? endstream endobj startxref 0 %%EOF 316 0 obj >stream h?b```e``?????","url":"https://jet-tek.com/camloc-mechanisms/AFS-Camloc-RAM-HoldDown.pdf","embedType":"link","name":""}"> https://jet-tek.com/camloc-mechanisms/AFS-Camloc-RAM-HoldDown.pdf
    • Ashish Khemka
      Ansys Employee


      If you can share the snapshots of geometry and boundary conditions then it would be easier for the team members to comment.

      Regards Ashish Khemka

    • Lavido
      Subscriber

      Thank you for your response.
      I really hoped that anyone with specific experience with this thing will see the question, but you are right :)
      The product is according to MIL-F-85731
      Legend -
      A - Locking Collar
      B - Hinge
      C - Hook
      D - Unit under Test
      E - Ground\Base
      Connections -
      A:B - Revolute
      A:C - Bonded
      D:E - Frictionless
      I have tried many combinations, this is the most relevant that I've found.



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