apilot.hlp

MATLAB在飞行动力学和控制中应用的工具

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 Beaver autopilot
 ================
 The S-functions APILOT1, APILOT2, and APILOT3 contain the simu-
 lation models of the 'Beaver' autopilot, coupled to the non-
 linear model of the 'Beaver' itself (S-function BEAVER). The
 three versions of the autopilot simulation systems differ in
 their complexity and computation speed.

 APILOT1
 =======
 This S-function contains the basic autopilot modes:

 *  Pitch Attitude Hold
 *  Altitude Hold
 *  Altitude Select
 *  Roll Attitude Hold
 *  Heading Hold / Heading select

 For reasons of computing speed, it does NOT contain:

 * approach and navigation modes
 * mode-switching loops for approach and navigation modes
 * ILS and VOR blocks
 * any noisy disturbances (sensors, atmospheric turbulence)
 * Moving Average filter for Altitude Hold mode

 APILOT1 can be used for fast evaluation of the basic autopilot
 results, using the integrators ADAMS/GEAR, which are quite
 efficient for systems with relatively smooth signals (i.e.,
 without MANY discontinuities). In that case, the simulations
 will be very fast, and the number of timesteps will be limited.

 APILOT2
 =======
 This S-function contains all control laws:

 *  Pitch Attitude Hold
 *  Altitude Hold
 *  Altitude Select
 *  Roll Attitude Hold
 *  Heading Hold / Heading Select
 *  longitudinal and lateral approach modes
 *  VOR-navigation mode

 Due to the inclusion of the approach and navigation modes, it
 also contains:

 *  mode-switching loops for approach and NAV (call M-files with
    mode-switching criteria, which slows down simulations)
 *  ILS and VOR blocks

 However, for reasons of computing speed, APILOT2 does NOT con-
 tain:

 *  any noisy disturbances (sensors, ILS noise, turbulence)
 *  Moving Average filter for Altitude Hold mode

 In order to cope with the additional blocks, the integrator
 RK45 had to be applied in stead of ADAMS/GEAR. Therefore, the
 number of time-steps is larger than for APILOT1, and simula-
 tions will be slower!

 APILOT3
 =======
 This S-function is equal to APILOT2, but it also inserts:

 *  ILS noise in the block ILS
 *  a Moving Average filter for Altitude Hold
 *  atmospheric turbulence

 Due to the noisy signals, the time steps are all equal to their
 minimum value, which means very slow simulations (unless you
 have a very fast PC or workstation).

 More info
 =========
 See the .HLP files ACTUATR, AP_SYMM, AP_ASYMM, and MODECTRL for
 more information about the blocks Actuator and cable dynamics,
 Symmetrical Autopilot modes, Asymmetrical Autopilot modes, and
 Mode Controller. See ILS.HLP and VOR.HLP for information about
 the radio-navigation blocks.

 See also COLORS.HLP for info on color definitions.

 References
 ==========
 For a detailed description of the 'Beaver' autopilot, the fol-
 lowing references should be consulted:

 [1]  M.O. Rauw, A SIMULINK environment for Flight Dynamics and
      Control analysis - Application to the DHC-2 'Beaver',
      PART II! Graduate's thesis, Delft University of Technology,
      Faculty of Aerospace Engineering, Delft, 1993.

 [2]  P.N.H. Wever, Ontwerp en implementatie van de regelwetten
      van de De Havilland DHC-2 'Beaver' (in Dutch). Graduate's
      thesis, Delft University of Technology, Faculty of Aero-
      space Engineering, Delft, 1993.

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The FDC toolbox, Copyright Marc Rauw 1994-1998.