📄 fwind.htm

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      FDC help: Fwind
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    <h2>
      Subsystem <i>Fwind</i>
    </h2>
    <p><i>Fwind</i> computes the
    contributions to the external forces along the body-axes in non-steady
    atmosphere (i.e., forces due to non-constant wind and/or atmospheric
    turbulence). See the descriptions of <i><a href="cwind.htm">Cwind</a></i>,
    <i><a href="blwind.htm">BLwind</a></i>, <i><a href=
    "turb1.htm">Turb1</a></i>, and <i><a href="turb2.htm">Turb2</a></i> for
    more information about the generation of the wind and turbulence velocities
    and their time-derivatives. The outputs from <i>Fwind</i> are sent to the block
    <i><a href="fmsort.htm">FMsort</a></i>.</p> 
    <h3>
      Inputvectors: <i>x</i> and <i>uwind</i>
    </h3>
<pre>
  x     = [V alpha beta p q r psi theta phi xe ye H]&#39;    (states)
  uwind = [uw vw ww uwdot vwdot wwdot]&#39; (wind + turbulence velo-
                                        cities and accelerations)

 {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 &#39;&#39;     &#39;&#39;          &#39;&#39;      &#39;&#39;  [m]        }
 {H    : altitude above sea-level [m]                           }

  uw   : wind + turbulence velocity along the XB-axis [m/s]
  vw   : wind + turbulence velocity along the YB-axis [m/s]
  ww   : wind + turbulence velocity along the ZB-axis [m/s]
  uwdot: d(uw)/dt [m/s^2]
  vwdot: d(vw)/dt [m/s^2]
  wwdot: d(ww)/dt [m/s^2]
</pre>
    The variables which are not actually needed by <i>Fwind</i> have been
    displayed between curly braces. 
    <h3>
      Outputvector: <i>Fwind</i>
    </h3>
<pre>
  Fwind = [Xw Yw Zw]&#39;.

where:

  Xw, Yw, Zw: forces due to non-steady atmosphere, measured along
              the aircraft&#39;s body-axes [N]
</pre>
    <h3>
      Parameters to be defined in the Matlab workspace
    </h3>
    <p><i>GM1</i>: vector with some important geometrical properties of the
    &#39;Beaver&#39; aircraft, and its mass (which is assumed to be constant
    during the motions of interest). Here, the mass <i>m</i> is extracted from
    <i>GM1</i>. <i>GM1</i> can be loaded from file by running the utility <i><a
    href="datload.htm">DATLOAD</a></i>. Run <i><a href=
    "modbuild.htm">MODBUILD</a></i> first if the datafile does not yet exist.</p>
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