Hi,
On Dienstag 27 September 2005 13:18, Gerard ROBIN wrote:
> I have found an autopilot in a "pre pre CVS" FA-18 Model , which is very
> good.
> It solve some bad reactions on high speed Aircrafts. mainly with the
> stand-alone JSBsim FDM F15 (from Erik)
> Mathias being the Author could answer better than i can.
Well, there is some generic flightgear autoliplot. I believe that I copied
that from just an other model. That autopilot is not very sophisticated or
well tuned.
The more important stuff is the flight control system of the f-18.
Usually the aerodynamic forces get bigger on higher speeds. As a result,
controlers can get unstable on high speeds.
The basic trick in the f-18 is that the controler gains will be smaller at
higher speeds, compensating that effect somehow.
Also the pitch control in that bird includes a g limiter for high speeds
together with a angle of attack controler for slow speeds. That is, the
actuators are controled in a way that pitch command is effectively a angle of
attack command. Especially that angle of attack pitch control improoves
flying qualities *very* much.
That is somehow like the f-14 demo included in matlabs aeroblock toolbox.
Greetings
Mathias
--
Mathias Fröhlich, email: [EMAIL PROTECTED]
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