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      <title>CORD1C</title>
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      <div class="title_refTopic" id="xps10_pagetitle">CORD1C </div>
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      <h4 class="refClassification">Cylindrical Coordinate System Definition, Form 1 </h4>
      <p class="para_refTopic">Defines a cylindrical coordinate system using three grid points. </p>
      <div class="title_refCategory">Format: </div>
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                     <p class="para_th">1 </p>
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                     <p class="para_th">2 </p>
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                     <p class="para_th">3 </p>
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                     <p class="para_th">4 </p>
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                     <p class="para_th">5 </p>
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                     <p class="para_th">6 </p>
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                     <p class="para_th">7 </p>
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                     <p class="para_th">8 </p>
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                     <p class="para_th">9 </p>
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                     <p class="para_td">CORD1C </p>
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                     <p class="para_td">CIDA </p>
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                     <p class="para_td">G1A </p>
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                     <p class="para_td">G2A </p>
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                     <p class="para_td">G3A </p>
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                     <p class="para_td">CIDB </p>
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                     <p class="para_td">G1B </p>
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                     <p class="para_td">G2B </p>
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                     <p class="para_td">G3B </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">CORD1C </p>
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                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">3 </p>
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                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">16 </p>
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                     <p class="para_td">32 </p>
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                     <p class="para_td">19 </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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      <div class="title_refCategory">Fields:</div>
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                     <p class="para_th"><b class="uiTerm">Field </b></p>
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                     <p class="para_th"><b class="uiTerm">Contents </b></p>
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                     <p class="para_td">CIDA, CIDB </p>
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                     <p class="para_td">Coordinate system identification number.  (Integer &gt; 0) </p>
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                     <p class="para_td">GiA, GiB </p>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Grid point identification numbers.  (Integer &gt; 0; G1A &ne; G2A &ne; G3A; G1B &ne; G2B &ne; G3B;) </p>
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         </table><br><a name="ref75847"></a><div class="figure">
            <p align="center"><img align="bottom" src="graphics/bulkc2-fig02.gif"></p>
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         <div class="title_figure">Figure. CORD1C Definition </div>
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      <div class="title_refCategory">Remarks: </div>
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            <li>
               <p class="para_item">Coordinate system identification numbers on all CORD1R, CORD1C, CORD1S, CORD2R, CORD2C, CORD2S and CORD3G entries must be unique. </p>
            </li>
            <li>
               <p class="para_item">One or two coordinate systems may be defined on a single entry. </p>
            </li>
            <li>
               <p class="para_item">GiA and GiB must be defined in coordinate systems with definitions that do not involve the coordinate system being defined.  The first point is the origin, the second lies on the z-axis, and the third lies in the plane of the azimuthal origin.  The three grid points GiA (or GiB) must be non-colinear and not coincident. </p>
            </li>
            <li>
               <p class="para_item">The location of a grid point (P in <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/14topic_7.html#ref75847');return(false);">Figure 13-</a>) in this coordinate system is given by (R, &theta;, Z) where &theta; is measured in degrees. 
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            </li>
            <li>
               <p class="para_item">The displacement coordinate directions at P are dependent on the location of P as shown above by (<em>u<sub class="subscript">r</sub></em>, <em>u</em><sub class="subscript">&theta;</sub>, <em>u<sub class="subscript">z</sub></em>). 
               </p>
            </li>
            <li>
               <p class="para_item">It is recommended that points on the z-axis not have their displacement directions defined in this coordinate system.  See the discussion of cylindrical coordinate systems in <a class="links" href="javascript:void(0)" onclick="top.popUpPage('QRG/linkInter_target_not_resolved.html#User:ref17864:-aux,-home','linkInter','menubar=yes,status=yes,resizable=yes,toolbar=yes,scrollbars=yes,location=no,directories=no');return(false);">&ldquo;Overview of Coordinate Systems in NX Nastran&rdquo; in the <em>NX Nastran User&rsquo;s Guide</em></a>. 
               </p>
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