Contact in Frequency response analysis

Mark Lin
Mark Lin Altair Community Member
edited January 2021 in Community Q&A

Hi all

I am confused about if I can set any slide contact in FRF analysis or Random vibration.

If my sample is just put on the vibration test table, should I set excitation for table and create a slide contact between table and sample? 

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Best Answer

  • Joshua Pennington
    Joshua Pennington New Altair Community Member
    edited January 2021 Answer ✓

    Hi Mark,

    Yes setup the model as you desire (eg slide contact), and for the FRF create a table and input the values from the vibration test. I'd recommend first running the modal analysis and making sure it makes sense then proceeding with the FRF.

    With this setup you may then create a Random analysis with the creation of a table with the PSD information.

    Have you viewed the OptiStruct tutorials on FRF and Random analysis?

Answers

  • Joshua Pennington
    Joshua Pennington New Altair Community Member
    edited January 2021 Answer ✓

    Hi Mark,

    Yes setup the model as you desire (eg slide contact), and for the FRF create a table and input the values from the vibration test. I'd recommend first running the modal analysis and making sure it makes sense then proceeding with the FRF.

    With this setup you may then create a Random analysis with the creation of a table with the PSD information.

    Have you viewed the OptiStruct tutorials on FRF and Random analysis?

  • Adriano Koga_20259
    Adriano Koga_20259 New Altair Community Member
    edited January 2021

    adding to what joshua pointed, SLIDE contact in linear analysis (static and dynamics) is allowed, but you have to be aware that it will act as a 2-way limit/constraint in your movement. SLIDE contact allows your parts to slide over each other, but DO NOT allow open/close change in the normal direction, ok?

  • Mark Lin
    Mark Lin Altair Community Member
    edited January 2021
    Joshua Pennington said:

    Hi Mark,

    Yes setup the model as you desire (eg slide contact), and for the FRF create a table and input the values from the vibration test. I'd recommend first running the modal analysis and making sure it makes sense then proceeding with the FRF.

    With this setup you may then create a Random analysis with the creation of a table with the PSD information.

    Have you viewed the OptiStruct tutorials on FRF and Random analysis?

    Hi Joshua Pennington

     

    Thank you for your reply. 

    I have viewed the tutorial on FRF and Random analysis.

    Actually I have another question , that is how to add different excitation in a FRF analysis.

    e.g. acceleration 10g & displacement 2mm

    I try to add them in a DLOAD

    But when I check the node where be the excited, the acceleration doesn't follow my excitation input.  

     

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