engmod.hlp

MATLAB在飞行动力学和控制中应用的工具

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ENGMOD (Beaver) is a masked Simulink subsystem which computes the
dimensionless force and moment coefficients due to operation of
the powerplant, using the engine forces & moments model of the
DHC-2 'Beaver' aircraft from ref.[1]. The block ENGMOD is con-
tained in the subsystem 'Engine Group' of the system BEAVER. It
uses the outputs from the block POWER.

Inputvectors: x and ypow (the input variables which are not used
by ENGMOD are displayed between brackets).
================================================================
  x    = [V alpha beta p q r psi theta phi xe ye H]'     (states)

  ypow = [dpt P]'    (dimensionless pressure increase across the
                       propeller and engine power, both computed
                                              in the block POWER)
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]                           }

  dpt  : dimensionless pressure increase across the propeller [-]
 {P    : engine power [Nm/s]                                    }

Outputvector: Cprop (prop = 'propulsive')
=========================================
  Cprop = [CXp CYp CZp Clp Cmp Cnp]'

where:

  CXp, CYp, CZp: force coefficients due to engine operation [-]
  Clp, Cmp, Cnp: moment coefficients due to engine operation [-]

Parameters, which must be set in the Matlab Workspace.
======================================================
  EM = matrix with stability and control derivatives of the
       'Beaver', due to engine operation (valid only for engine
       forces & moments model of the DHC-2 'Beaver', see ref.[1]).
       The matrix EM can be loaded into the workspace from file
       by applying the routine LOADER.M. Run MODBUILD.M first if
       the datafile does not yet exist. Type HELP LOADER or HELP
       MODBUILD for more info.

References.
===========
[1]  R.T.H. Tjee and J.A. Mulder. Stability and Control Deriva-
     tives of the De Havilland DHC-2 "Beaver" aircraft. Report
     LR-556, Delft University of Technology, 1988.

More info.
==========
See POWER.HLP for more info about the determination of the engine
power and dimensionless pressure increase across the propeller.
The forces in [N] and moments in [Nm] will be derived in the
block FMDIMS which uses Ct as inputvector. See FMDIMS.HLP for more
details.

See ENGGRP.HLP for info about the subsystem 'Engine Group'.

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The FDC toolbox, Copyright Marc Rauw 1994-1998.