General Mechanical

General Mechanical

Avionic Hold-Down FEA modeling

    • Lavido

      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.

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    • 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

      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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