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Motion simulator software control

  1. Aug 30, 2016 #1
    Hello Everyone. Thank you for reading this. :smile:

    I have a made a motion simulator pneumatically controlled. It is a bowl held by a stationary cradle with air cylinders tilting the bowl left,right, forwards and backwards. The software to control the cylinders is giving me fits. I am treating it with a simple linear function, ie;

    if distance from desired position to actual position >5 give cylinders some air
    if distance from desired position to actual position >50 give cylinders more air, etc.

    I get a lot of oscillations and overshoots. The air is compressible and I am moving weight either up or down a curve. (A model might be a pendulum with very high friction and the weight is a heavy sponge.) I think I must take into account starting position, inertia, lag, speed, etc. in a very high function equation. Any suggestions for me would be so appreciated, I do not know where to turn to learn more for this fun practical application.
     

    Attached Files:

  2. jcsd
  3. Aug 30, 2016 #2

    Nidum

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    Gold Member

    Feedback . PID control .

    Post a photograph of the set up .
     
    Last edited: Aug 30, 2016
  4. Aug 30, 2016 #3
    Will do when I get home. Pretty basic setup;string pot on air cylinders controlled by microcontroller and proportional valve.
     
  5. Sep 4, 2016 #4

    JBA

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    You may need to add more increments than just the two feed rates with a very small amount of feed as the bowl approaches the desired position and, a certain amount of deadband space (allowable out of position error band) is going to be required at the "desired position"; otherwise, the system will not be able to establish a stable point. If speed is important use a form of geometric progression on the feed rates as the distance from the desired position increases.
     
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