📄 engmod.htm
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<TITLE>FDC help: Engmod (Beaver)</TITLE>
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<H2>Subsystem <I><FONT FACE="Arial","Helvetica","Sans Serif">Engmod (Beaver)</FONT></I></H2>
<I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Engmod (Beaver)</FONT></I> is a masked S<SMALL>IMULINK</SMALL> subsystem which computes the dimensionless force and moment coefficients due to operation of the powerplant, using the engine forces & moments model of the DHC-2 'Beaver' aircraft from <A HREF="#References">ref.[1]</A>. The block <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Engmod</FONT></I> is contained in the subsystem <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="enggrp.htm">Engine Group</A></FONT></I> of the system <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="beaver.htm">Beaver</A></FONT></I>. It uses the outputs from the block <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="power.htm">Power (Beaver)</A></FONT></I> and its outputs are sent to the block <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="fmdims.htm">FMdims</A></FONT></I>, which are both also contained in the subsystem <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Engine Group</FONT></I>.
<H3>Inputvectors: <I>x</I> and <I>ypow</I></H3>
<PRE> x = [V alpha beta p q r psi theta phi xe ye H]' (states)
ypow = [dpt P]' (dimensionless pressure increase across the
propeller and engine power, both computed
in the block <A HREF="power.htm">Power (Beaver)</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] }
dpt : dimensionless pressure increase across the propeller [-]
{P : engine power [Nm/s] }
</PRE>
The input variables which are not actually used by <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Engmod (Beaver)</FONT></I> have been displayed between brackets
<H3>Outputvector: <I>Cprop</I> (<I>prop</I> = 'propulsion')</H3>
<PRE> Cprop = [CXp CYp CZp Clp Cmp Cnp]'
CXp, CYp, CZp: force coefficients due to engine operation [-]
Clp, Cmp, Cnp: moment coefficients due to engine operation [-]
</PRE>
<H3>Parameters to be defined in the M<SMALL>ATLAB</SMALL> Workspace.</H3>
<UL>
<LI><I>EM</I>: matrix with stability and control derivatives of the 'Beaver', due to engine operation (valid only for engine forces & moments model of the DHC-2 'Beaver', see <A HREF="#References">ref.[1]</A>). The matrix <I>EM</I> can be loaded into the workspace from file by running the routine <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="loader.htm">LOADER</A></FONT></I>. Run <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="modbuild.htm">MODBUILD</A></FONT></I> first if the datafile does not yet exist.
</UL>
<H3><A NAME= "References">References</A></H3>
<OL>
<LI>R.T.H. Tjee and J.A. Mulder. <I>Stability and Control Derivatives of the De Havilland DHC-2 "Beaver" aircraft</I>. Report LR-556, Delft University of Technology, 1988.
</OL>
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