[Flightgear-devel] PID Controller Bug?

2005-09-24 Thread Jeff McBride
I have been playing around with the autopilot this evening, and noticed something that seems to me to be broken. I ran into a problem where I would see a really large change in output (delta_u_n) but the output would not change (yes, this probably also means my gains need some adjusting), e.g.:

Re: [Flightgear-devel] PID Controller Bug?

2005-09-27 Thread Jeff McBride
Ahh, yes. I see your point. Since the change in output is based on change in error (not current error), if the amount of output shift is altered but the last error (ep_n_1) is not the two will effectively become out of sync. In fact, the same thing must have been happening when delta_u_n was

Re: [Flightgear-devel] PID Controller Bug?

2005-09-28 Thread Jeff McBride
See below... On 9/28/05, Roy Vegard Ovesen [EMAIL PROTECTED] wrote: On Wednesday 28 September 2005 21:03, Hans-Georg Wunder wrote: The original problem is, when there is an input change from 0 to u_max/kp, the output value is zero. This is wrong. It has to be u_max. The fix from Erik was

Re: [Flightgear-devel] PID Controller Bug

2005-09-29 Thread Jeff McBride
The patch committed by Erik: http://cvs.flightgear.org/cgi-bin/viewcvs/viewcvs.cgi/source/src/Autopilot/xmlauto.cxx.diff?r1=1.19r2=1.20cvsroot=FlightGear-0.9 should fix this. This is what would happen when you set delta_u_n = u_max - u_n_1 : delta_u_n (u_max - u_n_1) 0.6 (0.5 - 0.0) :

Re: [Flightgear-devel] FlightGear as a real time synthetic view

2005-10-29 Thread Jeff McBride
On 10/29/05, Curtis L. Olson [EMAIL PROTECTED] wrote: There is a neat flightgear connection here which I've probably mentioned before, but would like to mention again (with pictures.) http://www.flightgear.org/~curt/Models/Special/Rascal110_2/ This is a manually flown UAV (also pictured on

[Flightgear-devel] PropertyList over network

2005-11-11 Thread Jeff McBride
Hello All, I am considering using a property tree similar to that in Flightgear for a UAV ground control application, and I have a question for the developers on the list. Has anyone ever looked into creating a system to share a common property tree between two computers over a network

Re: [Flightgear-devel] Re: OT: FYI, mac os x developers,

2005-11-12 Thread Jeff McBride
On 11/12/05, Arthur Wiebe [EMAIL PROTECTED] wrote: Yeah, oops what's wrong with topposting? ;) Ok, I'm sorry to extend a very off-topic discussion, but here I go anyway... This one is a little lost on me. I understand why quoting whole messages, and using HTML or various encoding schemes can