📄 accel.htm
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<TITLE>FDC help: Accel</TITLE>
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<H2>Subsystem <I><FONT FACE="Arial","Helvetica","Sans Serif">Accel</FONT></I>
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<I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Accel</FONT></I> is a masked S<SMALL>IMULINK</SMALL> subsystem, used to compute the specific forces and accelerations of the aircraft, as measured in the aircraft's centre of gravity. The block <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Accel</FONT></I> is contained in the subsystem <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="moreouts.htm">Additional Outputs</A></FONT></I> of the system <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="beaver.htm">Beaver</A></FONT></I>. The outputs from <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Accel</FONT></I> are not needed to solve the state equations. Hence, <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Accel</FONT></I> can be removed from the system <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Beaver</FONT></I> without affecting the solution of the state equations.
<H3>Inputvectors: <I>Ftot</I> and <I>Fgrav</I>
</H3>
<PRE> Ftot = [Fx Fy Fz]' (total body-axes forces, coming from <A HREF="fmsort.htm">FMsort</A>)
Fgrav= [Xgr Ygr Zgr]' (body-axes forces due to gravity, coming
from the block <A HREF="gravity.htm">Gravity</A>)
Fx, Fy, Fz : total forces along the aircraft's body-axes [N]
Xgr, Ygr, Zgr: gravity forces along the aircraft's body-axes [N]
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<H3>Outputvector: <I>yacc
</I></H3>
<PRE> yacc = [Ax Ay Az axk ayk azk]'
Ax, Ay, Az : specific forces (= outputs of accelerometers) in
the centre of gravity of the aircraft [m/s^2]
axk, ayk, azk: components of the accelerations of the c.g. along
the body-axes [m/s^2]
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<H3>Parameters which must be defined in the M<SMALL>ATLAB</SMALL> Workspace
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<LI><I>GM1</I>: vector with some important geometrical properties of the 'Beaver' aircraft, and the mass of the aircraft (which is assumed to be constant during the motions of interest). Here, the mass <I>m</I> is extracted from the vector <I>GM1</I>. The vector <I>GM1</I> can be loaded from file by calling <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="loader.htm">LOADER</A></FONT></I>. If the datafile does not yet exist, run <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="MODBUILD.htm">modbuild</A></FONT></I> first.
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