📄 airdata3.htm

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      FDC help: Airdata3
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    <h2>
      Subsystem <i>Airdata3</i>
    </h2>
    <i>Airdata3</i> computes the total
    temperature <i>T<sub>t</sub></i> and Reynolds numbers <i>R<sub>e</sub></i>
    and <i>R<sub>c</sub></i>. Actually, the Reynolds numbers are no
    &#39;airdata variables&#39;, but they are closely related. Also, they are
    very important in aerospace engineering, in particular for the evaluation
    of windtunnel experiments. The block <i>Airdata3</i> is contained in the
    subsystem <i><a href="adgrp.htm">Airdata Group</a></i> of the system <i><a
    href="beaver.htm">Beaver</a></i>. Other airdata (-related) variables are
    computed in the blocks <i><a href="atmosph.htm">Atmosph</a></i>, <i><a
    href="airdata1.htm">Airdata1</a></i>, and <i><a href=
    "airdata2.htm">Airdata2</a></i>, which also contained in the subsystem
    <i>Airdata Group</i>. 
    <h3>
      Inputvectors: <i>x</i>, <i>yatm</i>, and <i>yad1</i>
    </h3>
<pre>
  x    = [V alpha beta p q r psi theta phi xe ye H]&#39;     (states)
  yatm = [rho ps T mu g]&#39;   (atmospheric properties, computed in
                                               the block <a href=
"atmosph.htm">Atmosph</a>)
  yad1 = [a M qdyn]&#39;    (airdata variables, computed in <a href=
"airdata1.htm">Airdata1</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 &#39;&#39;     &#39;&#39;          &#39;&#39;      &#39;&#39;  [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]                        }

 {a    : speed of sound [m/s]                                   }
  M    : Mach number [-]
 {qdyn : dynamic pressure [N/m^2]                               }
</pre>
    The inputvariables which are not actually used by <i>Airdata3</i> have been
    displayed between curly braces. 
    <h3>
      Outputvector: <i>yad3</i>
    </h3>
<pre>
  yad3 = [Tt Re Rc]&#39;,

  Tt   : total temperature [K]
  Re   : Reynolds number per m [1/m]
  Rc   : Reynolds number (using the mean aerodynamic chord as
         characteristic length) [-]
</pre>
    <h3>
      Parameters to be defined in the Matlab workspace
    </h3>
    <ul>
      <li>
        <i>GM1</i>: vector with some important geometrical properties of the
        &#39;Beaver&#39; aircraft, and the mass of the aircraft (which is
        assumed to be constant during the motions of interest). Here, the mean
        aerodynamic chord is needed, in order to find the Reynolds number
        <i>R<sub>c</sub></i>. <i>GM1</i> can be loaded into the workspace 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.
      </li>
    </ul>
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