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Question Adapting for body weight and steering

Discussion in 'DIY Motion Simulator Projects' started by Mirage, Feb 15, 2024.

  1. Mirage

    Mirage New Member

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    Hey all, I was looking into making a motorcycle like rig, and I was looking through things, and while I may have missed it because I don't know the lingo, I didn't see anything that took into account shifting your body weight around. Perhaps it's something that is built in to the commonly used software and as such is no longer talked about. Either way, I was curious about it, and figured more research is always better. I was thinking that if the shifting weight is not detected in the motors/actuators, it could be detected with sensors under the seat, a camera placed in front attached to a simulation, or the seat (the part above the actuators that holds you, so not just the seat) being slightly lifted and separated from the rest of the frame in order to figure out where the weight is. Or possibly the steering and automated tilting systems are enough and you don't really notice it.

    For more specifics about what I'm looking to make, I decided to start working (and seeing if it was viable for me) on a 6DoF rig for a star wars speeder bike (the classic ones) to hopefully start physically making something over the summer. I don't have a huge background in mechanical engineering or software, so I will have to learn much in order to get this done, which would be nice. I was hoping to eventually be able to hot-swap the actual seat part and turn it into a piloting chair and back again, but that feels like a future me problem.

    Also, since a motorcycle doesn't have straps like a piloting chair can, should I be worried about overpowering the motors and throwing myself off the rig, or riding a bucking bronco?
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    • Like Like x 1
  3. Chris_Beeves

    Chris_Beeves Active Member Gold Contributor

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    My Motion Simulator:
    DC motor, Arduino, Motion platform, 4DOF
    Awesome!!
    I have been thinking of trying the sim as a speeder but didn’t find any software. Is there any?

    I use GPbikes with my rig, it’s the only proper bike simulator with telemetry and stuff.
    It also supports different types of head tracking and VR, so you can affect the bike by moving around. There is more to weight shifting than head position though, so I just recently put load cells on the upper platform to better read rider movement.
    I wouldn’t worry about being ejected. That kind of motor power doesn’t happen by accident :p
  4. Mirage

    Mirage New Member

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    There aren't really any speeder bike sims to my knowledge, so I was planning on building one myself in the future, probably just a procedural chase scene on Endor in UE, so I could possibly work on the weight shifting a little more directly with that. How did you manage to read the rider movement that was more than just the bike tilting to the side, or does it mostly function when nearly vertical?
  5. Chris_Beeves

    Chris_Beeves Active Member Gold Contributor

    Joined:
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    My Motion Simulator:
    DC motor, Arduino, Motion platform, 4DOF
    Ooh, make it multiplayer! I’m down.

    My motion platform moves in a way that makes the load cell readings make sense. It also helps that I only use the acceleration of the body, not so much the position. The balanced dynamics of a two wheeler complicates some things and simplifies some.
    The speeders lean in a turn right?

    I was considering making a speeder mod for MX-bikes. -> VR and telemetry support included..