> On Wednesday 10 Mar 2010, Stuart Buchanan wrote: > > On Wed, Mar 10, 2010 at 3:55 PM, leee wrote: > > > There is always a risk associated with changing default > > > behaviour and the bottom line is that there is no immediate > > > need to do so, nor any overhead incurred by not doing so. > > > > > > This just seems like a commonsense policy to me, and was one of > > > the factors that lead to me stopping work on FG. > > > > > > LeeE > > > > Would there be any value in searching the aircraft XML files in > > CVS to see how many are using the pi-simple-controller ? > > > > That might provide some idea of how much of an issue this is, > > though obviously doesn't address non-CVS aircraft. > > > > -Stuart > > This is exactly the sort of think I'd hope to see at the end of the > transition/notification period and just before the default > behaviour was changed, so that any outstanding occurrences could be > looked into. I just greped through the current CVS aircraft and found the following results:
51 Aircraft and the generic-autopilot uses the pi-simple-controller 49 of these aircraft and the generic-autopilot uses the pi-simple-controller with a Ki of zero aka P-only the remaining 2 Aircraft use a pi-simple-controller with Ki greater than zero and u_min/u_max set. These two are potential candidates for windup errors. These two aircraft and the respective controllers are * b1900d: Vertical speed hold, Descent FPM and IAS hold * Citation-Bravo: Altitude Hold Stage 1 Looking at the A/P configuration files, I assume that having antiwindup code enabled should do no harm but might stabilize these autopilots in case they run into a saturated condition. Torsten ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
