Re: [Jsbsim-devel] Flaps command not changing flaps position

[Martin H. <mar...@gm...>]

Am Di., 6. Aug. 2019 um 01:33 Uhr schrieb Ron Jensen <wi...@je...>:

> Caveat: I have never used the library, only standalone and flightgear
>
> On Monday 05 August 2019 02:29:29 pm Martin Hoffmann wrote:
> >       - ...
> >       - FCS->SetDfCmd(10.0d); // set flaps to 10 percent
> >       - ...
>
> Should this be in the range [0-1] with 1 being 100%?
>

API docs state that input is in percent, but no matter if I use [0-1] or
[0-100], the result is the same.


>


> in my tree:
> src/models/FGFCS.h:  double GetDfCmd(void) const { return DfCmd; }
> src/models/FGFCS.h:  void SetDfCmd(double cmd) { DfCmd = cmd; }
>

These are exactly the functions my code is using.


>
> src/models/FGFCS.cpp:  PropertyManager->Tie("fcs/flap-cmd-norm", this,
> &FGFCS::GetDfCmd, &FGFCS::SetDfCmd);
>
>
> >       - aircraftStatus.FlapsPos = FCS->GetDfPos();
>
> This call seems to take an argument from src/models/FGFCS.h
> typedef enum { ofRad=0, ofDeg, ofNorm, ofMag , NForms} OutputForm;
>

> try FCS->GetDfPos(ofNorm); ?
>

You can select multiple output formats, but it has no impact of my flaps
not reacting at all.


>
> > I'm using the C172p model for a first test
>
> Is that the JSBSim model or the FlightGear model? Make sure there is xml
> in
> the flightcontrol tag that creates fcs/flap-pos-deg and doesn't do any
> failure modes on you. I notice the latest c172p from FlightGear includes
> some
> electrical system logic...
>
>         <channel name="Flaps">
>             <kinematic name="Flaps Control">
>                 <input>fcs/flap-cmd-norm</input>
>                 <traverse>
>                     <setting>
>                         <position>0</position>
>                         <time>0</time>
>                     </setting>
>                     <setting>
>                         <position>10</position>
>                         <time>2</time>
>                     </setting>
>                     <setting>
>                         <position>20</position>
>                         <time>1</time>
>                     </setting>
>                     <setting>
>                         <position>30</position>
>                         <time>1</time>
>                     </setting>
>                 </traverse>
>                 <output>fcs/flap-pos-deg</output>
>             </kinematic>
>         </channel>
>
> And note the time in the xml is in seconds, so it takes 4 seconds to apply
> full flaps.
>

I checked that the Flaps section is available in the XML. As I am using the
JSBSim model, there should no electrical systems logic that has an
influence. My loop runs for one simulated minute, so flaps should have
plenty of time to reacht.

I also tried to track down flaps management in the debugger, but I was
unable to locate the place in code where flaps are managed. Maybe someone
can point me at the right location?

Thanks again!


>
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