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

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

Bill,

Thanks for your suggestion. I tried to replicate your parameters, but the
result is still the same - the model does not react on flaps input. I set
the flaps to a non-zero state at the beginning using
FCS->SetDfPos(JSBSim::ofDeg, 30.0). Using this command, the flaps are set
accordingly, but they still don't react on the flaps command
FCS->SetDfCmd(10.0d) in the main loop.

Martin

Am Mo., 5. Aug. 2019 um 22:35 Uhr schrieb Bill Galbraith <
bil...@gm...>:

> Martin,
>
>
>
> I do all of my testing with scripts in JSBSim, but the concepts and
> parameters should be the same. From a Flaps-Up test:
>
>
>
>     <!-- Specify the initial conditions -->
>
>     <property value="7629.0"> ic/h-sl-ft </property>
>
>     <property value="118.0">  ic/vc-kts  </property>
>
>     <property value="0.375"> fcs/flap-cmd-norm </property>
>
>     <property value="15.0"> fcs/flap-pos-deg </property>
>
>     <property value="0.0"> gear/gear-cmd-norm </property>
>
>     <property value="0.0"> gear/gear-pos-norm </property>
>
>
>
>     <!-- Set the engines running and trim the aircraft. -->
>
>     <event name="Trim">
>
>       <condition> simulation/sim-time-sec ge 0.0 </condition>
>
>       <set name="propulsion/set-running"    value="-1"/>
>
>       <set name="simulation/do_simple_trim" value="1"/>
>
>     </event>
>
>
>
>     <!-- After 4 seconds, move the flap control in 0.25 seconds. -->
>
>     <event>
>
>       <condition> simulation/sim-time-sec ge 4.0 </condition>
>
>       <set name="fcs/flap-cmd-norm" value="0.0" action="FG_RAMP"
> tc="0.25"/>
>
>     </event>
>
>
>
> Hope this helps,
>
> Bill
>
>
>
> *From:* Martin Hoffmann [mailto:mar...@gm...]
> *Sent:* Monday, August 05, 2019 4:29 PM
> *To:* jsb...@li...
> *Subject:* [Jsbsim-devel] Flaps command not changing flaps position
>
>
>
> Hi all,
>
>
>
> I am trying to get JSBSim running as the flight model for a project using
> the Unity Game Engine. To get there, I built a DLL wrapper around JSBSim
> that makes it available to Unity as a third party component. Marshalling C#
> data to and from JSBSim works without any problems, and I have a running
> sim loop in Unity. I'm using the C172p model for a first test. So far, I
> set the engine controls in Unity, marshal them to JSB and receive engine
> data back in Unity. Engine behavior looks as expected with RPM increasing
> at the beginning and stabilizing after a few seconds into the sim loop.
>
>
>
> Next step would be setting the flaps according to the user's input, and
> this is where I got stuck. I am setting the flaps command, but the flaps
> don't react - flap position is always zero.
>
>
> This is the sequence I am using (following roughly the FlightGear
> implementation):
>
>
>
>    - Load aircraft model
>    - Set initial conditions:
>
>
>    - ...
>       - FCS->SetDfCmd(10.0d); // set flaps to 10 percent
>       - ...
>
>
>    - fdmex->RunIC();
>    - fdmex->DoTrim(JSBSim::tGround);
>    - Start the sim loop with with a frequency of 120 iterations per second
>
>
>    - fdmex->Setdt(120.0d);
>       - FCS->SetDfCmd(10.0d);
>       - fdmex->Run();
>       - aircraftStatus.FlapsPos = FCS->GetDfPos();
>
> No matter what DfCmd is set to, the result of GetDfPos() is always zero. I
> tested this with multilple single prop models. and the behavior is always
> the same. As already mentioned, other FDM parameters react as expected.
>
>
>
> Side note: The above test is running outside Unity, so Unity does not have
> an influence on the behavior.
>
>
>
> Any suggestions are highly appreciated!
>
>
>
> Cheers,
> Martin
>
>
>
>
>
>
>
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-- 
Dr. Martin Hoffmann
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67141 Neuhofen
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E-Mail: mar...@gm...