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Stewart platform leg force spreadsheet

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Erik Middeldorp, Sep 7, 2020.

  1. Erik Middeldorp

    Erik Middeldorp Member

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    I'm at the early stages of designing a 6 dof stewart platform and have been wondering what forces the actuators will have to deal with and how the size of the rig might affect that. I wasn't able to find any 6 dof force calculators but I did find these articles on how to calculate the kinematics and forces. Not being familiar with linear algebra or matrices, I had to go and learn a bit on khanacademy. Anyway, I think I've finished the spreadsheet and it looks to me like it's spitting out reasonable numbers although I haven't done any really rigorous testing.
    Here's the link or I've also attached the .ods and .xls files to this post.
    I made it in LibreOffice so the .ods file works best as far as I can tell. There are some form control sliders for adjusting the platform position that don't seem to work in the Excel version, but in LibreOffice it updates the charts as you move the slider.
    If anyone spots any mistakes or wrong looking numbers let me know. Feel free to copy and modify it.
    Now I have to figure out what are good numbers for the accelerations, platform mass and amount of travel to use.

    Attached Files:

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    Erik Middeldorp, Sep 7, 2020
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  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    noorbeast, Sep 7, 2020
    #2