fwind.hlp

来自「MATLAB在飞行动力学和控制中应用的工具」· HLP 代码 · 共 62 行

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FWIND is a Simulink subsystem, used to compute the contributions
to the external forces along the body-axes in non-steady atmos-
phere (i.e., forces due to non-constant wind and/or atmospheric
turbulence).

Inputvectors: x and uwind (variables which are not needed by
FWIND are displayed between accolades).
============================================================
  x     = [V alpha beta p q r psi theta phi xe ye H]'    (states)
  uwind = [uw vw ww uwdot vwdot wwdot]' (wind + turbulence velo-
                                        cities and accelerations)
where:

 {V    : airspeed [m/s]                                         }
 {alpha: angle of attack [rad]                                  }
 {beta : sideslip angle [rad]                                   }
  p    : roll rate [rad/s]
  q    : pitch rate [rad/s]
  r    : yaw rate [rad/s]
 {psi  : yaw angle [rad]                                        }
 {theta: pitch angle [rad]                                      }
 {phi  : roll angle [rad]                                       }
 {xe   : x-coordinate in Earth-fixed reference frame [m]        }
 {ye   : y-coordinate ''     ''          ''      ''  [m]        }
 {H    : altitude above sea-level [m]                           }

  uw   : wind + turbulence velocity along the XB-axis [m/s]
  vw   : wind + turbulence velocity along the YB-axis [m/s]
  ww   : wind + turbulence velocity along the ZB-axis [m/s]
  uwdot: d(uw)/dt [m/s^2]
  vwdot: d(vw)/dt [m/s^2]
  wwdot: d(ww)/dt [m/s^2]

Outputvector: Fwind.
====================
  Fwind = [Xw Yw Zw]'.

where:

  Xw, Yw, Zw: forces due to non-steady atmosphere, measured along
              the aircraft's body-axes [N]

Parameters which must be loaded in the Matlab Workspace.
========================================================
  GM1 = vector with some important geometrical properties of the
        'Beaver' aircraft, and the mass of the aircraft (which is
        assumed to be constant during the motions of interest).
        Here, the mass m is extracted from GM1. GM1 can be loaded
        from file by calling the M-file LOADER.M. Run MODBUILD.M
        first if the datafile does not yet exist. Type HELP
        LOADER or HELP MODBUILD for more info.

More info.
==========
See the .HLP files CWIND, BLWIND, TURB1, and TURB2 for more info
about the generation of the signals uw, vw, ww, uwdot, vwdot, and
wwdot. See also FMSORT.HLP.

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The FDC toolbox, Copyright Marc Rauw 1994-1998.