> Hi Jon, > I think it makes sense to clamp the integrated value in any PID > regulator. Due to the fact, that for a PID-regulator the output is > clamped, the integrator should be clamped to a value, which is > sufficient for reaching the maximum allowed output (even if the D-part > is working against the I-Part). > the below mentioned change would reduce the problem, but due to the not > exactly 1G load for any runway in the world, the problem would still > occur after longer times on the runway. > > Maik
Yes, the real F-16 FCS clamps the integrator output. The controller for the actual F-16 pitch channel is a PI controller, but in this one we have a PID (the pilot commands alpha). Also, when on the runway, the integrator is driven to zero, which we don't do (at the moment). I can't recall where this F-16 control model came from - Erik did this one. I'd like to modify this model, but I can't really do that until I get FlightGear capability back to flight test the model. The pitch channel FCS for the F-16 consists of ~60-80 blocks with 10-20 switches and 10-20 scheduled gains. I'd love to implement the whole control system in JSBSim - and it's on my list - but due to current time constraints ... Anyhow, I do think that with a little work this model can be tweaked and made very enjoyable to fly; I'll be doing what I can to make that happen shortly. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
