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Question How to figure out maximum movement?

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Carelsbergh_Stijn, Jan 13, 2019.

  1. Carelsbergh_Stijn

    Carelsbergh_Stijn Member

    Joined:
    Jul 19, 2018
    Messages:
    58
    Location:
    Belgium
    Balance:
    450Coins
    Ratings:
    +56 / 0 / -0
    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    Hello

    I want to know how to figure out the maximum movement my platform can do, to determine how my upper platform needs to be build, so that they don't bump into my actuators.

    Kind regards

    Carelsbergh Stijn
    Carelsbergh_Stijn, Jan 13, 2019
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
    Messages:
    20,551
    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    145,124Coins
    Ratings:
    +10,778 / 52 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    noorbeast, Jan 13, 2019
    #2
  3. Carelsbergh_Stijn

    Carelsbergh_Stijn Member

    Joined:
    Jul 19, 2018
    Messages:
    58
    Location:
    Belgium
    Balance:
    450Coins
    Ratings:
    +56 / 0 / -0
    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    Carelsbergh_Stijn, Jan 13, 2019
    #3
  4. Dirty

    Dirty Well-Known Member Gold Contributor

    Joined:
    Oct 15, 2017
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    All the way up front.
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    Germany
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    I wrote a little program that calculates the operational envelope of 6DOF platforms with linear actuators. However, it does not take into account collisions of the upper frame with the actuators, but only those points where the actuators themselves reach their max/min limits.
    Here's what these plots look like for a typpical rig:
    Heave vs. Surge.png Heave vs. Sway.png Pitch vs. Roll.png Surge vs. Sway.png

    I am working on a module that checks the clearance between the upper platform and the actuators to stop the rig from slamming into them, but the sticking point here is that the user has to provide a 3D model for the collision check. If that model is off, all envelope information is basically useless :-/
    I tried to parametrise the shape of the upper platform, but peoples rigs are diverse and do not follow a clear design guide. Might be a dead end...

    Cheers, Dirty :)
    • Informative Informative x 1
    • Useful Useful x 1
    Dirty, Feb 21, 2022
    #4
  5. early_m

    early_m Active Member

    Joined:
    Jul 28, 2016
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    318
    Location:
    Chelmsford
    Balance:
    824Coins
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    +342 / 4 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform
    Grab fusion 360 and get modelling
    early_m, Feb 22, 2022
    #5