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Analysis of a 2DOF motion platform

Discussion in 'DIY Motion Simulator Projects' started by Andrei14, Mar 4, 2019.

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  1. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Yes you could connect the PSU.

    With LFS run it before patching it for motion, as that generates some required files: https://www.xsimulator.net/communit...run-in-first-person-mode-before-patching.345/

    I look forward to following the rest of your build.
  2. Andrei14

    Andrei14 New Member

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    Connected the PSU. Also did a first run in LFS, then patched it.
    After I patched the game, did some minor settings just to see how the motors will move with the game on. But I believe that I have to work more at axis settings. I find weird that after I take a bumper/corner in LFS the motors start moving after 2-3 seconds (sometimes doesn't move, but most of the time it moves with delay).

    I'll update the thread once I find the right settings :D

    And @noorbeast I know that you live in Australia, and I'm really sorry for what is happening there man. My thoughts and prayers are with you guys.
  3. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Thanks for your kind thoughts. It has been a rough time for many Down Under, luckily the fires the closest to me is not an immediate threat, but are also not yet under control.

    There should not be a significant delay in your rig's response. Here are some tips to refining your motion profile, initially do one axis at a time: https://www.xsimulator.net/community/faq/steps-to-create-a-motion-profile.228/
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  4. Andrei14

    Andrei14 New Member

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    Nice that's what I was reading.:nerd
    Thanks for your kind support.
    If I will not be able to refine my rig, I'll ask for help here.
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  5. Andrei14

    Andrei14 New Member

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    Ok so I believe that it's time to update this post.
    So I bought a Logitech g920, and this week I started to build the frame.
    I will attach some pictures with the frame.

    I hope that today I will link the frames together with the motors.

    Attached Files:

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  6. Andrei14

    Andrei14 New Member

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    More pics coming haha :D

    I believe that I made a mistake, and I have to move the 2nd frame forward a little bit.
    Not sure yet about that.

    Attached Files:

  7. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
  8. Andrei14

    Andrei14 New Member

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    Hi,
    Yes the motors are isolated.
    I am following the RacingMat's design.
    The motors will be place at the back of the platform.
  9. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    I will be interested to see how it goes, as a car seat is much heavier than a race seat.

    Why is the seat mounted so high on the top frame? It is preferable to have the seat base as close to the uni joint as possible, otherwise it puts additional strain on the motors, as well as introducing some odd geometry.
  10. Andrei14

    Andrei14 New Member

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    The seat didn't allowed me to modify it and make it lower.. That was a problem. I hope that the motors have enough power to move the top frame.
    If not I will search for another seat, lighter
  11. Andrei14

    Andrei14 New Member

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    Hi, you were right ahhaha :D the seat is kinda heavy - but right now this is not a problem.
    I need to calculate the G force or at least to approximate it.
    Any idea how could I do it?

    Thanks a lot!

  12. tomkil192

    tomkil192 Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    first grab the grinder and lower the seat right down.
    then make a shorter motor arm (5-6cm center holes - this should be enough to feel good force and not to burn the motors.
    Good luck
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  13. Andrei14

    Andrei14 New Member

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    Yeah I need to redesign the whole thing - at least now I have a better view of how it should be. Anyway I will buy a lighter seat. This one have 20kg or something like that...
    The problem that I have right it is that I need to finish my thesis - and theoretically, I need to calculate the forces that acts on my sim and the G-Forces generated by the linear and longitudinal acceleration.
    I will work more at the design of it after I finish writing my thesis, which is very time consuming..
  14. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    These tools may be of use:

    SimCalc will give you a basic idea of design Vs physics tradeoffs, there is also a link to the underlying mathematical assumptions for SimCalc: https://www.xsimulator.net/communit...e-linear-speed-and-forces-of-your-design.270/

    The Axis Analysis App will give you a real time analysis of SimTools Axis Settings: https://www.xsimulator.net/community/faq/axis-analysis-app.282/

    You can also simulate a 2DOF simulator: https://www.xsimulator.net/community/faq/simulating-a-2dof-simulator.278/
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  15. Andrei14

    Andrei14 New Member

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    Hi,

    In the SimCalc Math Reference sheet, we have the formula for linear speed.
    I don't understand the value 0.10472. Can someone explain what it represents?

    Thanks!
  16. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
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    My Motion Simulator:
    3DOF, DC motor, JRK
    I am sure @Tim McGuire would be happy to explain the underlying SimCalc assumptions, when he has a free moment.
    • Like Like x 1