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Interesting motion platform

Discussion in 'Commercial Simulators and Peripherie' started by egoexpress, Oct 9, 2010.

  1. egoexpress

    egoexpress Active Member

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    Found on youtube:

    http://www.youtube.com/watch?v=9LXbkV6zTTM

    http://www.youtube.com/watch?v=2eeHkK6pI8U

    Regards
    egoexpress, Oct 9, 2010
    #1
  2. egoexpress

    egoexpress Active Member

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    Indeed, those movements are missing.

    The video description is irritating:
    As all 3 leg pairs are moving simultaneously, I doubt that 6DOF is possible.
    Or the construction is able to move the legs independently, but they havent the Stewart algorithm implemented yet perhaps. :?

    regards
    egoexpress, Oct 9, 2010
    #2
  3. Frakk

    Frakk Active Member

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    I see no reason why they cannot make the legs move independently. The calculations for a 3DOF movement are much much simpler, the same as you would do with a 3 actuator design. Height = distance between 2 legs for each actuator, Roll = difference of 2 side actuators, Pitch = difference of front 2 actuators and back actuator.

    If you incorporate yaw sway and surge, the math gets a bit more complicated...
    Frakk, Oct 9, 2010
    #3
  4. adgun

    adgun Active Member

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    adgun, Oct 10, 2010
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  5. egoexpress

    egoexpress Active Member

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    The pdf shows platform forces for x,y,z,pitch,roll,yaw though...

    And there is an option for: Optional six DOF force/torque sensor which would not be needed in a scissor type actuator setup.

    ....weird.
    egoexpress, Oct 10, 2010
    #5
  6. Frakk

    Frakk Active Member

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    Because the movement matches the movement of a scissor type actuator, it doesn't mean anything.

    They are controlling 2 actuators that seem to be tied together on the same ball screw, but in reality they are controlled independently.
    This simplifies their geometrical calculations, but if they had the proper 6DOF algorithm the platform could accommodate that as well.
    Frakk, Oct 10, 2010
    #6