📄 airdata1.htm
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FDC help: Airdata1
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<h2>
Subsystem <i>Airdata1</i>
</h2>
<p><i>Airdata1</i> computes the speed
of sound <i>a</i>, the Mach number <i>M</i>, and the dynamic pressure
<i>qdyn</i>. The block <i>Airdata1</i> is contained in the subsystem <i><a
href="adgrp.htm">Airdata Group</a></i> of the <i><a href="beaver.htm">Beaver</a></i> model. Other airdata (-related) variables are
computed in the blocks <i><a href="atmosph.htm">Atmosph</a></i>, <i><a
href="airdata2.htm">Airdata2</a></i>, and <i><a href=
"airdata3.htm">Airdata3</a></i>, which also contained in the subsystem
<i>Airdata Group</i>. </p>
<h3>
Inputvectors: <i>x</i> and <i>yatm</i>
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<pre>
x = [V alpha beta p q r psi theta phi xe ye H]' (states)
yatm = [rho ps T mu g]' (atmospheric properties, computed in
the block <a href=
"atmosph.htm">Atmosph</a>)
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] }
rho : airdensity [kg/m^3]
{ps : static pressure [N/m^2] }
T : temperature [K]
{mu : dynamic viscosity [kg/(m*s)] }
{g : acceleration of gravity [m/s^2] }
</pre>
<p>The inputvariables which are not actually used by <i>Airdata1</i> have been
displayed between curly braces. </p>
<h3>
Outputvector: <i>yad1</i>
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<pre>
yad1 = [a M qdyn]'
a : speed of sound [m/s]
M : Mach number [-]
qdyn : dynamic pressure [N/m^2]
</pre>
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