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      <title>CONM2</title>
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      <div class="title_refTopic" id="xps10_pagetitle">CONM2 </div>
      <hr noshade="true">
      <h4 class="refClassification">Concentrated Mass Element Connection, Rigid Body Form </h4>
      <p class="para_refTopic">Defines a concentrated mass at a grid point. </p>
      <div class="title_refCategory">Format: </div>
      <div class="refCategoryContent">
         <table border="1" width="100%" align="center">
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                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">1 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">2 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">3 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">4 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">5 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">6 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">7 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">8 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">9 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">10 </p>
                  </th>
               </tr>
            </thead>
            <tbody>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CONM2 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">EID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">CID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">M </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">X1 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">X2 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">X3 </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">I11 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">I21 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">I22 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">I31 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">I32 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">I33 </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
            </tbody>
         </table><br></div>
      <div class="title_refCategory">Example: </div>
      <div class="refCategoryContent">
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                     <p class="para_td">CONM2 </p>
                  </td>
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                     <p class="para_td">2 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">15 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">6 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">49.7 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
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                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">16.2 </p>
                  </td>
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                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">16.2 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">7.8 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
            </tbody>
         </table><br></div>
      <div class="title_refCategory">Fields:</div>
      <div class="refCategoryContent">
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                     <p class="para_th"><b class="uiTerm">Field </b></p>
                  </th>
                  <th align="left" colspan="1" rowspan="1">
                     <p class="para_th"><b class="uiTerm">Contents </b></p>
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            <tbody>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">EID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Element identification number.  (Integer &gt; 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">G </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Grid point identification number.  (Integer &gt; 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Coordinate system identification number. For CID of -1 see X1, X2, X3 below.  (Integer &ge; -1; Default = 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">M </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Mass value.  (Real) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">X1, X2, X3 </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Offset distances from the grid point to the center of gravity of the mass in the coordinate system defined in field 4, unless CID = -1, in which case X1, X2, X3 are the coordinates, not offsets, of the center of gravity of the mass in the basic coordinate system.  (Real) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">lij </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Mass moments of inertia measured at the mass center of gravity in the coordinate system defined by field 4.  If CID = -1, the basic coordinate system is implied.  (For I11, I22, and I33; Real &ge; 0.0; for I21, I31, and I32; Real) </p>
                  </td>
               </tr>
            </tbody>
         </table><br></div>
      <div class="title_refCategory">Remarks: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li>
               <p class="para_item">Element identification numbers should be unique with respect to all other element identification numbers. </p>
            </li>
            <li>
               <p class="para_item">For a more general means of defining concentrated mass at grid points, see the CONM1 entry description. </p>
            </li>
            <li>
               <p class="para_item">The continuation is optional. </p>
            </li>
            <li>
               <p class="para_item">If CID = -1, offsets are internally computed as the difference between the grid point location and X1, X2, X3.  The grid point locations may be defined in a nonbasic coordinate system.  In this case, the values of Iij must be in a coordinate system that parallels the basic coordinate system. </p>
            </li>
            <li>
               <p class="para_item">The form of the inertia matrix about its center of gravity is taken as: </p>
               <p class="para_item"><img align="bottom" src="graphics/bulkc2-equ01.gif" border="0"></p>
               <p class="para_item">where </p>
               <table cellpadding="8" width="100%" align="center">
                  <colgroup span="1">
                     <col span="1" width="14.81*">
                     <col span="1" width="12.35*">
                     <col span="1" width="72.84*">
                  </colgroup>
                  <tbody>
                     <tr>
                        <td align="right" colspan="1" rowspan="1">
                           <p class="para_td">M </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">= </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">∫&rho;<em>dV</em></p>
                        </td>
                     </tr>
                     <tr>
                        <td align="right" colspan="1" rowspan="1">
                           <p class="para_td">I11 </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">= </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">∫&rho;(<em>x</em><sub class="subscript">2</sub><sup class="superscript">2</sup> + <em>x</em><sub class="subscript">3</sub><sup class="superscript">2</sup>)<em>dV</em></p>
                        </td>
                     </tr>
                     <tr>
                        <td align="right" colspan="1" rowspan="1">
                           <p class="para_td">I22 </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">= </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">∫&rho;(<em>x</em><sub class="subscript">1</sub><sup class="superscript">2</sup> + <em>x</em><sub class="subscript">3</sub><sup class="superscript">2</sup>)<em>dV</em></p>
                        </td>
                     </tr>
                     <tr>
                        <td align="right" colspan="1" rowspan="1">
                           <p class="para_td">I33 </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">= </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">∫&rho;(<em>x</em><sub class="subscript">1</sub><sup class="superscript">2</sup> + <em>x</em><sub class="subscript">2</sub><sup class="superscript">2</sup>)<em>dV</em></p>
                        </td>
                     </tr>
                     <tr>
                        <td align="right" colspan="1" rowspan="1">
                           <p class="para_td">I21 </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">= </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">∫&rho;(<em>x</em><sub class="subscript">1</sub><em>x</em><sub class="subscript">2</sub>)<em>dV</em></p>
                        </td>
                     </tr>
                     <tr>
                        <td align="right" colspan="1" rowspan="1">
                           <p class="para_td">I31 </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">= </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">∫&rho;(<em>x</em><sub class="subscript">1</sub><em>x</em><sub class="subscript">3</sub>)<em>dV</em></p>
                        </td>
                     </tr>
                     <tr>
                        <td align="right" colspan="1" rowspan="1">
                           <p class="para_td">I32 </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">= </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">∫&rho;(<em>x</em><sub class="subscript">2</sub><em>x</em><sub class="subscript">3</sub>)<em>dV</em></p>
                        </td>
                     </tr>
                  </tbody>
               </table><br><p class="para_item">and </p>
               <p class="para_item"><em>x</em><sub class="subscript">1</sub>, <em>x</em><sub class="subscript">2</sub>, <em>x</em><sub class="subscript">3</sub> are components of distance from the center of gravity in the coordinate system defined in field 4. 
               </p>
               <p class="para_item">The negative signs for the off-diagonal terms are supplied automatically.  A warning message is issued if the inertia matrix is nonpositive definite, since this may cause fatal errors in dynamic analysis modules. </p>
            </li>
            <li>
               <p class="para_item">If CID &ge; 0, then X1, X2, and X3 are defined by a local Cartesian system, even if CID references a spherical or cylindrical coordinate system.  This is similar to the manner in which displacement coordinate systems are defined. </p>
            </li>
            <li>
               <p class="para_item">See <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; </a>in the <em>NX Nastran User&rsquo;s Guide</em> for a definition of coordinate system terminology. 
               </p>
            </li>
         </ol>
      </div>
      <div class="title_refCategory">Remarks related to SOLs 601 and 701: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li>
               <p class="para_item">X1, X2, and X3 are ignored, i.e., the center of gravity of the mass is assumed to be at the grid point. </p>
            </li>
            <li>
               <p class="para_item">CID is ignored, i.e., mass moments of inertia components Iii (1 &le; i &le; 3) are assumed to be in the displacement coordinate system of grid point G. </p>
            </li>
            <li>
               <p class="para_item">I21, I31, and I32 are ignored. The displacement coordinate system for grid point G should coincide with the principal axes of the concentrated mass. </p>
            </li>
         </ol>
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