> Hi,
> Could anyone please tell me where can I obtain detailed
> explaination about the
> terms under the path /fdm/jsbsim/ inside FG Properties? Since I want to
> anaylse the aerodynamic of the aircraft, I need to know what the
> terms mean,
> and I also want to know what is meant by having a (double)
> indication next to
> the value.
>
> Thanks
Hi,
There isn't much formal documentation at the moment that is available for
the JSBSim properties. If you have some specific properties you'd like to
know about, post the queries here. For starters, here are the aerodynamic
properties (and definitions) of the Cessna 172:
********************
****** INPUTS ******
********************
Location of the aerodynamic reference point in the aircraft structural
frame, measured in inches:
/fdm/jsbsim/metrics/aero-rp-x-in
/fdm/jsbsim/metrics/aero-rp-y-in
/fdm/jsbsim/metrics/aero-rp-z-in
Maximum and minimum alpha (angle of attack) in degrees:
/fdm/jsbsim/aero/alpha-max-deg
/fdm/jsbsim/aero/alpha-min-deg
Wing span/(2*Velocity)
/fdm/jsbsim/aero/bi2vel
Wing chord/(2*Velocity)
/fdm/jsbsim/aero/ci2vel
*********************
****** OUTPUTS ******
*********************
Ground effect factors for lift and drag:
/fdm/jsbsim/aero/function/ground-effect-factor-lift
/fdm/jsbsim/aero/function/ground-effect-factor-drag
Runtime-created aerodynamic force and moment components from definitions in
the <aerodynamics> section of the configuration file (varies per-aircraft):
/fdm/jsbsim/aero/coefficient/CLwbh
/fdm/jsbsim/aero/coefficient/CLDf
/fdm/jsbsim/aero/coefficient/CLDe
/fdm/jsbsim/aero/coefficient/CLadot
/fdm/jsbsim/aero/coefficient/CLq
/fdm/jsbsim/aero/coefficient/CDo
/fdm/jsbsim/aero/coefficient/CDDf
/fdm/jsbsim/aero/coefficient/CDwbh
/fdm/jsbsim/aero/coefficient/CDDe
/fdm/jsbsim/aero/coefficient/CDbeta
/fdm/jsbsim/aero/coefficient/CYb
/fdm/jsbsim/aero/coefficient/CYda
/fdm/jsbsim/aero/coefficient/CYdr
/fdm/jsbsim/aero/coefficient/CYp
/fdm/jsbsim/aero/coefficient/CYr
/fdm/jsbsim/aero/coefficient/Clb
/fdm/jsbsim/aero/coefficient/Clp
/fdm/jsbsim/aero/coefficient/Clr
/fdm/jsbsim/aero/coefficient/Clda
/fdm/jsbsim/aero/coefficient/Cldr
/fdm/jsbsim/aero/coefficient/Cmalpha
/fdm/jsbsim/aero/coefficient/CmDf
/fdm/jsbsim/aero/coefficient/Cmq
/fdm/jsbsim/aero/coefficient/Cmadot
/fdm/jsbsim/aero/coefficient/Cmo
/fdm/jsbsim/aero/coefficient/Cmde
/fdm/jsbsim/aero/coefficient/Cnb
/fdm/jsbsim/aero/coefficient/Cnp
/fdm/jsbsim/aero/coefficient/Cnr
/fdm/jsbsim/aero/coefficient/Cnda
/fdm/jsbsim/aero/coefficient/Cndr
Alpha of the wing in radians (includes the angle of incidence of the wing,
if input):
/fdm/jsbsim/aero/alpha-wing-rad
Stall hysteresis, normalized:
/fdm/jsbsim/aero/stall-hyst-norm
Angles of attack and sideslip in radians and degrees (and the magnitudes):
/fdm/jsbsim/aero/alpha-rad
/fdm/jsbsim/aero/beta-rad
/fdm/jsbsim/aero/mag-beta-rad
/fdm/jsbsim/aero/alpha-deg
/fdm/jsbsim/aero/beta-deg
/fdm/jsbsim/aero/mag-beta-deg
Dynamic pressure in psf:
/fdm/jsbsim/aero/qbar-psf
Dynamic pressure in the body axis XZ plane:
/fdm/jsbsim/aero/qbarUW-psf
Dynamic pressure in the body axis XY plane:
/fdm/jsbsim/aero/qbarUV-psf
Time rate of change in alpha and sideslip in deg/sec and rad/sec:
/fdm/jsbsim/aero/alphadot-rad_sec
/fdm/jsbsim/aero/betadot-rad_sec
/fdm/jsbsim/aero/alphadot-deg_sec
/fdm/jsbsim/aero/betadot-deg_sec
Altitude of CG divided by wing span:
/fdm/jsbsim/aero/h_b-cg-ft
Altitude of MAC divided by wing span:
/fdm/jsbsim/aero/h_b-mac-ft
Aerodynamic rotational rates in rad/sec (includes wind effects, if any):
/fdm/jsbsim/velocities/p-aero-rad_sec
/fdm/jsbsim/velocities/q-aero-rad_sec
/fdm/jsbsim/velocities/r-aero-rad_sec
Aerodynamic velocities in ft/sec (includes wind effects, if any):
/fdm/jsbsim/velocities/u-aero-fps
/fdm/jsbsim/velocities/v-aero-fps
/fdm/jsbsim/velocities/w-aero-fps
The body axis aerodynamic force vector of the aircraft in lbs:
/fdm/jsbsim/forces/fbx-aero-lbs
/fdm/jsbsim/forces/fby-aero-lbs
/fdm/jsbsim/forces/fbz-aero-lbs
The stability axis aerodynamic force vector of the aircraft in lbs:
/fdm/jsbsim/forces/fwx-aero-lbs
/fdm/jsbsim/forces/fwy-aero-lbs
/fdm/jsbsim/forces/fwz-aero-lbs
The body axis aerodynamic moment vector of the aircraft in ft-lbs:
/fdm/jsbsim/moments/l-aero-lbsft
/fdm/jsbsim/moments/m-aero-lbsft
/fdm/jsbsim/moments/n-aero-lbsft
The lift coefficient squared:
/fdm/jsbsim/aero/cl-squared
Dynamic pressure times reference area:
/fdm/jsbsim/aero/qbar-area
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