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      FDC help: Example systems OLOOP1/2/3
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    <h2>
      Open-loop example systems
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    <p>The FDC toolbox contains three open-loop example systems, which demonstrate
    how the <i><a href="beaver.htm">Beaver</a></i> model can be used in
    practice: <i>OLOOP1</i>, <i>OLOOP2</i>, and <i>OLOOP3</i>. These systems have been included in the FDC directory  <small>EXAMPLES</small>; they can be opened by typing <code>oloop1</code>,  <code>oloop2</code>, or <code>oloop3</code> at the Matlab command line.</p> 
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    <h3><a name="oloop1/2" id="oloop1/2"><i>OLOOP1</i> and <i>OLOOP2</i></a></h3>
     <p><i>OLOOP1</i> and <i>OLOOP2</i> demonstrate how the system <i>Beaver</i>
    can be used in practice for non-linear, off-line, open-loop simulations of
    the &#39;Beaver&#39; aircraft. <i>OLOOP1</i> computes responses to
    control inputs to the elevator, ailerons, rudder, engine RPM, or
    manifold pressure of the engine, while <i>OLOOP2</i> computes non-linear
    aircraft responses to atmospheric turbulence.</p>
    <p>Before running a simulation, it is necessary to define the parameters for the aircraft model, by loading them into the workspace using <i><a href="datload.htm">DATLOAD</a></i>. In addition, it is necessary to load trimmed-flight initial conditions with <i><a href="triload.htm">TRILOAD</a></i>, or compute trimmed-flight conditions with the <i><a href="actrim.htm">ACTRIM</a></i> utility. These routines can all be started by double-clicking the initialization buttons on top of the <i>OLOOP1</i> or <i>OLOOP2</i> models.</p>
    <h3><a name="oloop3" id="oloop3"><i>OLOOP3</i></a></h3>
     <p><i>OLOOP3</i> demonstrates how to create open-loop simulations of aircraft
    responses to control inputs using a linearized aircraft model which is
    derived from the non-linear model <i>Beaver</i>.</p> 
    <p>The system matrices of the
    linear state-space model must be defined in the Matlab workspace before it
    is possible to start a simulation. These matrices can be determined for a
    user-specified operating point with the linearization routine <i><a href=
    "aclin.htm">ACLIN</a></i> (double-click the appropriate button-block in the
    block-diagram of <i>OLOOP3</i> to start this program). They can also be
    loaded from file (for instance a <small>*.LIN</small> file, created by
    <i>ACLIN</i>), which can be done conveniently with the utility <i><a href=
    "linload.htm">LINLOAD</a></i>. Both <i>ACLIN</i> and <i>LINLOAD</i> can be started by double-clicking the initialization buttons on top of the <i>OLOOP3</i> model.</p>
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