I haven't looked at these autopilot configurations (at least not for a long
time) but off the top of my head, I think this can all be fixed by tuning
the autopilot.
For instance, lowering the max aileron deflection from (-1 ... 1) down to
maybe (-0.1 ... 0.1) might be an interesting thing to start with. These are
normalized values so +/-1 represents full deflection and 0.1 represents
1/10th of full deflection. If the autopilot is hitting you with full
instantaneous aileron deflection that might be part of the issue.
The other thing to look at is tuning the actual PID gains. These are
obscured a bit given that we are using a slightly different form of the PID
algorithm compared to what you might see in a Control Theory-101 class. I
believe there is an autopilot tuning README and it just takes some fiddling
around to see what changing the different values will accomplish. There's
an art (maybe part science) to tuning autopilots ... I've yet to meet an
expert in that area, but they must exist ... they are probably locked in the
basement of Airbus and Boeing and various UAV companies and not allowed to
leave their cells. :-)
Curt.
On Sat, Oct 10, 2009 at 1:56 PM, Pete Morgan <ac...@daffodil.uk.com> wrote:
> I'm working on my motion sim for xmas. Its powered by a vacum cleaner
> atmo..
> One BIG BIG problem - am basicng the cockpit on Bravo and 787
>
> The autopilot heading bug is very violent and JERKS to direction..
>
> How can we solve that problem please because on my motion platform, I
> cant keep up with the drastric movements. Actually I can, but this is
> where there is a problem..
>
> the behaviour of bank is performing well with the Ardiono/pneumatics
> card firing off the valves,
>
> however the violent values from the autopilot when auto pilot is engaged
> is causing a problem..
>
> I've damped it down in my arduino/python middle man code,
>
> But I think this problem is an actual flightgear problem..
>
> Any one offer me some advice which area of code to look at please...
>
> eg I could damp it in nasal script ?
>
> pete
>
>
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--
Curtis Olson: http://baron.flightgear.org/~curt/
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