📄 ap_asymm.htm
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FDC help: Asymmetrical autopilot modes
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<h2>
Autopilot model, subsystem <i>Asymmetrical autopilot modes</i>
</h2>
<p>The subsystem <i>Asymmetrical autopilot modes</i>, which is part of 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> contains the following control modes
of the 'Beaver' autopilot: </p>
<ul>
<li>
Roll Attitude Hold (RAH), including turn coordination
</li>
<li>
Heading Hold / Heading Select (HH)
</li>
<li>
VOR-Navigation (NAV)
</li>
<li>
asymmetrical approach mode: Localizer (LOC)
</li>
</ul>
<p>The RAH mode is also used as inner-loop for HH, NAV, and LOC.</p>
<p>In Localizer mode, a switch criterion is used to switch from the
Localizer-Armed phase, in which the aircraft is usually flying under HH
control, to Localizer-Coupled. Note: for reasons of computing speed, LOC
has not been included in the system <i>APILOT1</i>.</p>
<p>The block <i>Select asymm. mode-controller signals</i> in the subsystem
<i>Asymmetrical autopilot modes</i> separates the mode-switch settings from
the inputvector <i>ymode</i> and reference signals from the inputvector
<i>yref</i> for the asymmetrical autopilot modes from the symmetrical
mode-switch settings and reference signals.</p>
<h3>
More information
</h3>
<p>See the explanation of the subsystems <i><a href="modectrl.htm">Mode
Controller</a></i> and <i><a href="refsgnls.htm">Reference Signals</a></i>
for more information about the inputvectors <i>ymode</i> and <i>yref</i>.
See also the <a href="colors.htm">color definition table</a> for the FDC
toolbox and the subsystem <i><a href="ap_symm.htm">Symmetrical autopilot
modes</a></i>. </p>
<h3>
<a name="References">References</a>
</h3>
<p>For a detailed description of the 'Beaver' autopilot, refer to the FDC user-manual. More information can be found in the following
references:</p>
<ol>
<li>
M.O. Rauw: <i>A Simulink environment for Flight Dynamics and Control
analysis - Application to the DHC-2 'Beaver'</i> (PART II).
MSc-thesis, Delft University of Technology, Faculty of Aerospace
Engineering, Delft, The Netherlands, 1993.
</li>
<li>
P.N.H. Wever: <i>Ontwerp en implementatie van de regelwetten van de De
Havilland DHC-2 'Beaver'</i> (in Dutch). MSc-thesis, Delft
University of Technology, Faculty of Aerospace Engineering, Delft, The
Netherlands, 1993.
</li>
</ol>
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