Re: A little help

On Saturday 13 October 2012 19:22:11 Leandro Santos de Lima wrote:
> Hi, good evening!
>
> I am studing some features of JSBsim and I need to get some flight and
> simutation properties. Many of them I have no trouble but some have been
> hard to get. They are:
>
>
>    - Drag force;
>    - Lift force;
>    - Inside force;
>    - Traction force;
>    - Roll moment;
>    - Yaw moment and
>    - Pitch moment.
>
> I have used a property-list protocol like this:
>
> <PropertyList>
>
> >   <generic>
> >     <output>
> >       <binary_mode>false</binary_mode>
> >       <var_separator>\t</var_separator>
> >       <line_separator>\r\n</line_separator>
> >       <preamble>t\t VT\t alfa\t beta\t phi\t theta\t psi\t P\t Q\t R\t
> > H\t deltaA\t deltaE\t deltaR\t D\t L\t Y\t T\t \bar{L} M\t N\t</preamble>
> > <postamble></postamble>
> >
> >   <chunk>
> >         <node>/fdm/jsbsim/sim-time-sec</node>
> >         <type>float</type>
> >         <format>%.4f</format>
> >       </chunk>
> >
> >   <chunk>
> >         <node>/velocities/airspeed-kt</node>
> >         <type>float</type>
> >         <format>%.4f</format>
> >       </chunk>
>
> but I have no idea of the property node to get those properties.
>
>
> Could someone help me?
>
> All the best,
> Leandro Lima

Assuming you're using FlightGear, look in /fdm/jsbsim, you'll find these 
folders:

    accelerations - output accelerations
    aero - working folder for aerodynamics
    atmosphere - output on what the atmosphere is locally
    attitude - yaw pitch roll
    fcs - working folder for the flight control system
*   forces - forces acting on the model in various frames 
    gear - working folder for contact points
    ic - initial conditions
    inertia - vehicle mass and cg
    inertial - navigation stuff
    metrics - data on vehicle lengths and areas
*   moments - moments acting on the model in various frames
    position - output position
    propulsion - working folder for engines and thrusters
    simulation - simulation control stuff
    systems - model systems, fuel control or other things
    velocities - output velocities

It sounds like you're looking for:
(the w in fwx is for wind frame)
    forces/fwx-aero-lbs == drag
    forces/fwy-aero-lbs == side 
    forces/fwz-aero-lbs == lift
(the b in fbx is for body frame)
    forces/fbx-prop-lbs == thrust (longitudinal) 
    forces/fby-prop-lbs == side component of thrust
    forces/fbz-prop-lbs == vertical component of thrust

    moments/l-total-lbsft == roll moment
    moments/m-total-lbsft == pitch moment
    moments/n-total-lbsft == yaw moment

Hope that helped,

Ron

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