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Wheels vibrate violently when transmission is locked (transbrake/park) while on ice surface

Discussion in 'Troubleshooting: Bugs, Questions and Support' started by fuzelol, Aug 24, 2019.

  1. fuzelol

    fuzelol
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    Aug 17, 2013
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    Here's a weird one. While your wheels are moving at speed (~20+ km/h) on a slippery surface, if you lock the transmission via a transbrake or putting it in park, the wheels will start to vibrate back and forth.

    How to reproduce:
    1. Spawn on Gridmap and drive to the ice surface
    2. Spawn the Ibishu 200BX with Base (A) config
    3. Put it in reverse, rev to 4-5,000
    4. Put in park
    5. Observe
    Here's a video showing the bug:


    It's a very very small issue but thought I'd report it anyway.
     
    #1 fuzelol, Aug 24, 2019
  2. Kueso

    Kueso
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    have you tried to reproduce this bug w/out mods?
     
    #2 Kueso, Aug 24, 2019
  3. fuzelol

    fuzelol
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    Yes, running in safe mode gives the same result
     
    #3 fuzelol, Aug 24, 2019
  4. Kueso

    Kueso
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    interesting
    ill have to check this out
     
    #4 Kueso, Aug 24, 2019
  5. stenyak

    stenyak
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    Programmer & Global Moderator
    BeamNG Team

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    Does not happen here with the stock vehicle (no mods). Make sure you eliminate all traces of incorrectly installed mods by doing a clean reinstall: https://wiki.beamng.com/BeamNG_FAQ#How_do_I_perform_a_clean_reinstall.3F

    Additionally, note that any modifications to vehicles can lead to mechanical issues. The effect you expose in that video (in a clearly non-default vehicle) also happens in real life given the appropriate modifications:
     
    #5 stenyak, Aug 27, 2019
  6. fuzelol

    fuzelol
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    It still happens to me in safe mode (no mods active) so it might be hardware related, but it seems like a weird thing for hardware to affect.

    I also don't think it is axle tramp or anything like that because if you do it slow motion you can see the wheel bounce back and forth instead of rotating in one direction:
     
    #6 fuzelol, Aug 27, 2019
  7. Goosah

    Goosah
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    BeamNG Team

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    Aug 30, 2013
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    Good find! I discovered why this is happening. There was no drivetrain damping added into park and transbrake mode. Friction itself is a form of damping, so the lack of added damping only became apparent on ice. I've now added some damping and it looks way more stable :)
     
    #7 Goosah, Aug 28, 2019
    • Like Like x 1
  8. fuzelol

    fuzelol
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    Glad I could help, even though it is a very very minor issue :D
     
    #8 fuzelol, Aug 28, 2019
    • Like Like x 1
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