Alan Teeder wrote: > Do you really expect much help after that "stuff you lot" remark? > Sorry.. guess it my frustration... > As a former autopilot designer I would suggest that what is needed is a rate > limit on roll angle demand within the autopilot. You could also try to add > some roll damping within the autopilot. It is possible that the FDM for your > aircraft is making the simulated aircraft over-sensitive to aileron. > Precisely the problem,. I;m readinga property tree and aparently all aircraft with new heading can Immeseatley "tip" to that bank angle,, u can so that with live controls. dot period . > How this should be implemented within Flightgear I am not in a position to > tell you as I am not familiar with the code, sorry. > > Who I'd like to engage is someone who is familiar witht eh "code", albeit c_++, py or indeed nasal..
This is a problem across the whole system and a mega fault. pete > -----Original Message----- > From: Pete Morgan [mailto:ac...@daffodil.uk.com] > Sent: 10 October 2009 20:18 > To: FlightGear developers discussions > Subject: Re: [Flightgear-devel] Autopilot and violent roll > > Actually my motion platform is at the momnet I am taking it one step at > a time.. ie so far its banking left to right by around 10 degree's which > kinda exagarrated the sim and is useful.. > > Anyone as a pilot at the moment can tip the aircfaft to lbank.. However > this jerk needs solving.. SO what you are saying is .. stuff FlightGear > and its your problem.. > > pete > > > Curtis Olson wrote: > >> 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 >> <mailto: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 >> >> >> > ---------------------------------------------------------------------------- > -- > >> Come build with us! The BlackBerry(R) Developer Conference in SF, CA >> is the only developer event you need to attend this year. >> Jumpstart your >> developing skills, take BlackBerry mobile applications to market >> and stay >> ahead of the curve. Join us from November 9 - 12, 2009. Register now! >> http://p.sf.net/sfu/devconference >> _______________________________________________ >> Flightgear-devel mailing list >> Flightgear-devel@lists.sourceforge.net >> <mailto:Flightgear-devel@lists.sourceforge.net> >> https://lists.sourceforge.net/lists/listinfo/flightgear-devel >> >> >> >> >> -- >> Curtis Olson: http://baron.flightgear.org/~curt/ >> <http://baron.flightgear.org/%7Ecurt/> >> ------------------------------------------------------------------------ >> >> >> > ---------------------------------------------------------------------------- > -- > >> Come build with us! The BlackBerry(R) Developer Conference in SF, CA >> is the only developer event you need to attend this year. Jumpstart your >> developing skills, take BlackBerry mobile applications to market and stay >> ahead of the curve. Join us from November 9 - 12, 2009. Register now! >> http://p.sf.net/sfu/devconference >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> Flightgear-devel mailing list >> Flightgear-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/flightgear-devel >> >> > > > ---------------------------------------------------------------------------- > -- > Come build with us! The BlackBerry(R) Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart your > developing skills, take BlackBerry mobile applications to market and stay > ahead of the curve. Join us from November 9 - 12, 2009. Register now! > http://p.sf.net/sfu/devconference > _______________________________________________ > Flightgear-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel > > > ------------------------------------------------------------------------------ > Come build with us! The BlackBerry(R) Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart your > developing skills, take BlackBerry mobile applications to market and stay > ahead of the curve. Join us from November 9 - 12, 2009. Register now! > http://p.sf.net/sfu/devconference > _______________________________________________ > Flightgear-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel > ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
