On Sunday 02 December 2007, John Denker wrote: > > The problem that I am addressing is the fact that an object can not move > > from one position to another in an instant. > > Why?
Simply because it's impossible, but if it can move faster than our simulator rate, then it does not matter. Or was this a rhetorical question. :-) > d) slew rate limiting in the hydraulic system ??? > That's something yet again, not mentioned until now. > > e) programmed slew rate limiting in the autopilot ??? > > Since very few of our users have force-feedback joysticks, there > is no realistic way to model (a), (b), or (c) ... and attempting > to model any of those with the suggested low-pass filter is a > bad idea ... worse than no filter at all. > > Item (d) makes more sense; it should be modeled by the FDM on > the few aircraft that actually exhibit a significant amount of > this behavior. This is readily possible in JSBSim. I was not aware of this when I posted my initial RFC. > Item (e) should be modeled within the autopilot. Real autopilots > are sure-as-shootin slew rate limited. ... and this is readily possible in the autopilot configuration using the noise spike filter, where you can set the max rate of change. > > To repeat: > > 1) In the overwhelming majority of aircraft, Asking the FDM to > low-pass filter the controls (to any significant degree) is > unrealistic. > > 2) In the few aircraft where there is a significant limitation > in the fly-by-wire system, sure, go ahead and model it. This > will require a lot more than a low-pass filter. > > 3) As the proverb says, pilots are judged on their smoothness, > not on their quickness. Smoothness is built into the pilots; > it is not usually built into the hardware. -- Roy Vegard Ovesen ------------------------------------------------------------------------- SF.Net email is sponsored by: The Future of Linux Business White Paper from Novell. From the desktop to the data center, Linux is going mainstream. Let it simplify your IT future. http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4 _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
