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Wheels are not round, but they are round, how it works?

Discussion in 'Troubleshooting: Bugs, Questions and Support' started by fufsgfen, Feb 19, 2018.

  1. fufsgfen

    fufsgfen
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    So as we know, tires are just nodes, hold at their place by beams, created by code from parameters which define how many nodes there will eventually be.

    Usually wheels don't have huge amount of nodes so there is distance between nodes and this distance between nodes is flat area.

    That means tires are bit blocky and when you set up camber to racing levels it is quite visible at very low speeds:


    However when you speed up, tires seem to be round.

    Mythbusters did test square wheels and with increased speed ride was smoother.

    Now I'm wondering if in BeamNG beams flex at speed or if tires more of hop from node to node so that they just appear to be smooth and round (same thing as in Mythbusters).

    Probably this is useless piece of information, but it has been something I have been curious about, not sure if it can be used in any way.
     
  2. Goosah

    Goosah
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    BeamNG Team

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    The main principle is of something called "transmissibility" in vibrations. At very low speed, the oscillations from the tire shape are close to the natural frequency of the suspension and body motion (wrt the tire contact patch) and the damping of the structures (mainly the tire beams at fault here) cannot fully dissipate things, causing some weird rocking to happen. It quickly leaves this danger zone as the tire speeds up, and in this region the tire itself responds to the periodic forcing (deflects and rolls as if it is round) without any large amplitudes building up in the wheel hub or beyond.
     
  3. fufsgfen

    fufsgfen
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    Thank you, it is very cool how this works and also that developers can find time to explain such for us is rare and awesome part of BeamNG :)

    Also thanks to Darren from reminding these awesome features:


    Not sure why, but that is same way fascinating to look at as internals of mechanical clock, could spend hours staring that perfect motion. I guess it is same as streetlamp for a moth :D
     
    • Agree Agree x 1
  4. CrazyFlySquid

    CrazyFlySquid
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    Can sort of get this to happen with stock cars, some of them it doesn't happen at all and some it's only at very, very low speeds (I had trouble getting the car to even stay running it was so slow). It also seems to be wheel dependent, some modded wheels are pretty bad and some are fine.

    Edit: Other replies didn't show rip :(
     
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