On Wed, 2002-01-16 at 10:13, Andy Ross wrote: > Jon S. Berndt wrote: > > Alex wrote: > > > For starters, can the JSB filters (etc) stuff be used without > > > JSBSim? > > > > The base class of all JSBSim classes - including the FCS classes - is > > FGJSBBase. So, technically, no. > > This would be a good feature to look at breaking out of the FDM. At > its most reductionist, a FCS system compares (1) pilot control inputs > and (2) FDM output to produce control surface positions. None of that > requires access to the internals of the FDM. A well-designed FCS > would work with any conceivable FDM.
For 90% of what FG is used for this is probably true. For the general case, however, it depends on how much data you want to put into the property tree and/or on the bus. Even moderately sophisticated flight control systems can be dependent on quite a number of parameters. > > Here's a plausible black-box model: the FCS subsystem takes its > control inputs from the /controls/ property tree, and places its > output into the /fcs/ tree. So, we'd modify the FDM configurations to > look there instead, and no code change would be necessary. We could > (unsuccessfully) fly a C172 with a F-16 fly-by-wire system without > change. > > > The way I see it now (and it's just off the top of my head) is that > > *IF* the JSBSim config file specifies an autopilot for an aircraft, > > then that autopilot would be used instead of the one from the > > FlightGear side. This is because I'd also like the ability to run it > > with JSBSim standalone. > > I don't see why moving the FCS out of JSBSim precludes your ability to > run the thing standalone. You could maintain your own tree > independant of FlightGear as you do right now (or just keep it in the > JSB tree "next to" the FDM). Alternatively, you could place it in > SimGear, which is designed as a library already. There are lots of > options. Again, viable for 90% of what FG does, but not for the general case. Any FCS that incorporates stability augmentation, for example, will be very specific to that aircraft (and sometimes even sub-models). > > Andy > > -- > Andrew J. Ross NextBus Information Systems > Senior Software Engineer Emeryville, CA > [EMAIL PROTECTED] http://www.nextbus.com > "Men go crazy in conflagrations. They only get better one by one." > - Sting (misquoted) > > > _______________________________________________ > Flightgear-devel mailing list > [EMAIL PROTECTED] > http://mail.flightgear.org/mailman/listinfo/flightgear-devel -- Tony Peden [EMAIL PROTECTED] We all know Linux is great ... it does infinite loops in 5 seconds. -- attributed to Linus Torvalds _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
