📄 atmosph.htm
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<TITLE>FDC help: Atmosph</TITLE>
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<H2>Subsystem <I><FONT FACE="Arial","Helvetica","Sans Serif">Atmosph</FONT></I></H2>
<I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Atmosph</FONT></I> is a masked S<SMALL>IMULINK</SMALL> subsystem, which computes some atmospheric properties, using the ICAO Standard Atmosphere model (see for instance <A HREF="#Standard Atmosphere">ref.[1]</A>). The block also computes the acceleration of gravity and the dynamic coefficient of viscosity. The block <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Atmosph</FONT></I> is contained in the subsystem <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="adgrp.htm">Airdata Group</A></FONT></I> of the system <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="beaver.htm">Beaver</A></FONT></I>. Other airdata
(-related) variables are computed in the blocks <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="airdata1.htm">Airdata1</A></FONT></I>, <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="airdata2.htm">Airdata2</A></FONT></I>, and <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="airdata3.htm">Airdata3</A></FONT></I>, which also contained in the subsystem <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Airdata Group</FONT></I></FONT></I>.
<H3>Inputvector: <I>x
</I></H3>
<PRE> x = [V alpha beta p q r psi theta phi xe ye H]' (states)
{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]
</PRE>
The variables which are not actually used by <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Atmosph</FONT></I> have been displayed between accolades.
<H3>Outputvector: <I>yatm</I>
</H3>
<PRE> yatm = [rho ps T mu g]', (atmospheric properties)
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>
<H3><A NAME= "Standard Atmosphere">References</A></H3>
<OL>
<LI>Ruijgrok, G.J.J. <EM>Elements of airplane performance</EM>. Delft University Press, Delft, The Netherlands, 1993.
</OL>
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