dimless.hlp

MATLAB在飞行动力学和控制中应用的工具

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DIMLESS is a masked Simulink subsystem, which computes dimension-
less rotational velocities pb/2V, qc/V, and rb/2V. Of course, the
computation itself is trivial if the elements of the state vector
x are known, but these variables may be needed more than once.
The block DIMLESS is contained in the subsystem 'Aerodynamics
Group' of the system BEAVER.

Inputvector: x (the inputvariables which are not needed by
DIMLESS are displayed between accolades).
=============================================================
  x = [V alpha beta p q r psi theta phi xe ye H]'        (states)

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]                           }

Outputvector: ydl.
==================
  ydl = [pb/2V qc/V rb/2V]' (dimensionless rotational velocities).

where:

  pb/2V: dimensionless roll-rate  (b = wing span)
  qc/V : dimensionless pitch-rate (c = cbar = mean aerodynamic
                                   chord)
  rb/2V: dimensionless yaw-rate   (b = wing span)

Parameters which must be loaded in the Matlab Workspace.
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  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 wing span b and the mean aerodynamic chord cbar
        are extracted from GM1. GM1 can be loaded into the work-
        space 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 details.

More info.
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The dimensionless rotational velocities are used by the aerodyna-
mic model of the 'Beaver', see AEROMOD.HLP. See also AEROGRP.HLP
for info about the subsystem 'Aerodynamics Group (Beaver)'.

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The FDC toolbox, Copyright Marc Rauw 1994-1998.