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FDC help: Actuator & cable dynamics
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The autopilot subsystem <i>Actuator & cable dynamics</i>
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<p>The autopilot subsystem <i>Actuator & cable dynamics</i> contains the
dynamics of the actuators and cables for the ailerons, elevator, and rudder
channels. It is used by the systems <i><a href=
"apilot.htm#APILOT1">APILOT1</a></i>, <i><a href=
"apilot.htm#APILOT2">APILOT2</a></i>, and <i><a href=
"apilot.htm#APILOT3">APILOT3</a></i> and by the systems <i><a href="apilot.htm#PAHRAH">PAH</a></i>, <i><a href="apilot.htm#PAHRAH">RAH</a></i>, and <i><a href="apilot.htm#PAHRAH">PAHRAH</a></i>.</p>
<p>In the case of the 'Beaver'
aircraft, these dynamics have been modeled as linear state-space blocks
with state matrices <i>Aail</i>, <i>Bail</i>, <i>Cail</i>, <i>Dail</i>,
<i>Aelv</i>, <i>Belv</i>, <i>Celv</i>, <i>Delv</i>, and <i>Arud</i>,
<i>Brud</i>, <i>Crud</i>, and <i>Drud</i>. These matrices must be loaded
into the Matlab workspace before starting a simulation of the autopilot
models.</p>
The initialization utilities <i><a href=
"apinit.htm">APINIT</a></i>, and <i><a href="prahinit.htm">PRAHINIT</a></i> contain a menu option to load these matrices into the workspace (both utilities use the subroutine <i>ACTRLOAD</i>
when the user presses the button 'Load state-space actuator/cable
models'). The model-data will then be extracted from the files
<small>FCS35.DAT</small>, <small>FCS45.DAT</small>, or
<small>FCS55.DAT</small>. The three datafiles contain state matrices for
the airspeeds <i>V = 35 m/s</i>, <i>V = 45 m/s</i>, and <i>V = 55 m/s</i>,
respectively. Choose the set which best fits your desired flight-condition;
in general the data for <i>V = 45 m/s</i> (<small>FCS45.DAT</small>) will
yield good results.<br>
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Note that all signals between the control laws and the block <i>Actuator
and cable dynamics</i> have been expressed in Volts, whereas the
<i>outputs</i> of the block <i>Actuator and cable dynamics</i> represent
changes in elevator-deflection, aileron-deflection, and rudder-deflection,
respectively. Consequently, the latter signals have been measured in [rad].
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