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      <title>VELOCITY</title>
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      <div class="title_refTopic" id="xps10_pagetitle">VELOCITY </div>
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      <h4 class="refClassification">Velocity Output Request </h4>
      <p class="para_refTopic">Requests the form and type of velocity vector output. </p>
      <div class="title_refCategory">Format: </div>
      <div class="refCategoryContent">
         <p align="center"><img align="bottom" src="graphics/casecontrol4a-ufig83.gif"></p>
      </div>
      <div class="title_refCategory">Examples: </div>
      <div class="refCategoryContent"><pre class="indent">VELOCITY=5
VELOCITY(SORT2,PHASE,PUNCH)=ALL</pre></div>
      <div class="title_refCategory">Describers:</div>
      <div class="refCategoryContent">
         <table cellpadding="10" cellspacing="" width="100%" align="center">
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                  <th align="left" colspan="1" rowspan="1">
                     <p class="para_th"><b class="uiTerm">Describer </b></p>
                  </th>
                  <th align="left" colspan="1" rowspan="1">
                     <p class="para_th"><b class="uiTerm">Meaning </b></p>
                  </th>
               </tr>
            </thead>
            <tbody>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">SORT1 </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Output will be presented as a tabular listing of grid points for each load, frequency, eigenvalue, or time, depending on the solution sequence. </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">SORT2 </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Output will be presented as a tabular listing of frequency or time for each grid point. </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">PRINT </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">The printer will be the output medium. </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">PUNCH </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">The punch file will be the output medium. </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">PLOT </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Generates, but does not print, velocities. </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">REAL or IMAG </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Requests rectangular format (real and imaginary) of complex output.  Use of either REAL or IMAG yields the same output. </p>
                  </td>
               </tr>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">PHASE </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Requests polar format (magnitude and phase) of complex output.  Phase output is in degrees. </p>
                  </td>
               </tr>
               <tr>
                  <td colspan="1" rowspan="1" valign="top">
                     <p class="para_td">ABS</p>
                  </td>
                  <td colspan="1" rowspan="1" valign="top">
                     <p class="para_td">For enforced motion dynamic analysis, velocity results will be output as absolute velocity.</p>
                  </td>
               </tr>
               <tr>
                  <td colspan="1" rowspan="1" valign="top">
                     <p class="para_td">REL</p>
                  </td>
                  <td colspan="1" rowspan="1" valign="top">
                     <p class="para_td">For enforced motion dynamic analysis, velocity results will be output relative to the enforced motion input.</p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" height="47" rowspan="1" valign="top">
                     <p class="para_td">PSDF </p>
                  </td>
                  <td align="left" colspan="1" height="47" rowspan="1" valign="top">
                     <p class="para_td">Requests the power spectral density function be calculated for random analysis post-processing. The request must be made above the subcase level and RANDOM must be selected in the Case Control. See remark 7.</p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">ATOC </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Requests the autocorrelation function be calculated for random analysis post-processing. The request must be made above the subcase level and RANDOM must be selected in the Case Control. See remark 7.</p>
                  </td>
               </tr>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CRMS </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Requests the cumulative root mean square function be calculated for random analysis post-processing. Request must be made above the subcase level and RANDOM must be made in the Case Control. See remark 7.</p>
                  </td>
               </tr>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">RALL</p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Requests all of PSDF, ATOC, and CRMS be calculated for random analysis post-processing. The request must be made above the subcase level and RANDOM must be selected in the Case Control. See remark 7.</p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">RPRINT</p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Writes random analysis results to the print file. (Default) See remark 7.</p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">NORPRINT</p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Disables the writing of random analysis results to the print file. See remark 7.</p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">RPUNCH</p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Writes random analysis results to the punch file. See remark 7.</p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">ALL </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Velocity for all solution points will be output. </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">NONE </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Velocity for no solution points will be output. </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">n </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Set identification of a previously appearing SET command.  Only velocities of points with identification numbers that appear on this SET command will be output.  (Integer&gt;0) </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">Both PRINT and PUNCH may be requested. </p>
            </li>
            <li>
               <p class="para_item">Velocity output is only available for transient and frequency response problems. </p>
            </li>
            <li>
               <p class="para_item">See <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/05ref73192_40.html');return(false);">DISPLACEMENT</a> for a discussion of SORT1 and SORT2. 
               </p>
            </li>
            <li>
               <p class="para_item">VELOCITY=NONE overrides an overall output request. </p>
            </li>
            <li>
               <p class="para_item">The PLOT option is used when curve plots are desired in the magnitude/phase representation and no printer request is present for magnitude/phase representation. </p>
            </li>
            <li>
               <p class="para_item">Velocity results are output in the global coordinate system (see field CD on the GRID Bulk Data entry). </p>
            </li>
            <li>
               <p class="para_item">The option of PSDF, ATOC, CRMS, and RALL, or any combination of them can be selected for random analysis. The results can be either printed to the .f06 file, punched to the punch file, or output to both files using RPRINT and RPUNCH.</p>
            </li>
            <li>
               <p class="para_item">When doing enforced motion dynamic analysis and relative output is requested (using the REL describer), the output will be relative to the input as described by the equation:</p>
               <p class="para_item"><img align="bottom" src="graphics/relative_motion_eqn.gif" border="0"></p>
               <p class="para_item">where u<sub class="subscript">f</sub> = absolute displacement
               </p>
               <p class="para_item">y<sub class="subscript">f</sub> = relative displacement
               </p>
               <p class="para_item">u<sub class="subscript">s</sub> = enforced motion.
               </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">Output is restricted to REAL format. IMAG, PHASE, PSDF, ATOC and RALL are ignored. </p>
            </li>
            <li>
               <p class="para_item">Displacements, velocities and accelerations must be output for the same set of grid points if requested. Output requested for set n in this command will be combined with the sets requested in the DISPLACEMENT and ACCELERATION commands, and velocities will be output at the grid points of the combined set. </p>
            </li>
         </ol>
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