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      <title>RANDPS</title>
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      <div class="title_refTopic" id="xps10_pagetitle">RANDPS </div>
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      <h4 class="refClassification">Power Spectral Density Specification </h4>
      <p class="para_refTopic">Defines load set power spectral density factors for use in random analysis having the frequency dependent form </p>
      <p class="para_refTopic"><img align="bottom" src="graphics/bulkqrs-equ06.gif" border="0"></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">8 </p>
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                     <p class="para_th">9 </p>
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                     <p class="para_th">10 </p>
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                     <p class="para_td">RANDPS </p>
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                     <p class="para_td">SID </p>
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                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">J </p>
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                     <p class="para_td">K </p>
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                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">X </p>
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                     <p class="para_td">Y </p>
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                     <p class="para_td">TID </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">Example: </div>
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                     <p class="para_td">RANDPS </p>
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                     <p class="para_td">5 </p>
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                     <p class="para_td">3 </p>
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                     <p class="para_td">7 </p>
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                     <p class="para_td">2.0 </p>
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                     <p class="para_td">2.5 </p>
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                     <p class="para_td">4 </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">SID </p>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Random analysis set identification number.  (Integer &gt; 0) </p>
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                     <p class="para_td">J </p>
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                     <p class="para_td">Subcase identification number of the excited load set.  (Integer &gt; 0) </p>
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                     <p class="para_td">K </p>
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                     <p class="para_td">Subcase identification number of the applied load set.  (Integer &ge; 0; K &ge; J) </p>
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                     <p class="para_td">X, Y </p>
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                     <p class="para_td">Components of the complex number.  (Real) </p>
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                     <p class="para_td">TID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Identification number of a TABRNDi entry that defines <em>G</em>(<em>F</em>).  (Integer &ge; 0) 
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      <div class="title_refCategory">Remarks: </div>
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         <ol type="1" start="1">
            <li>
               <p class="para_item">Set identification numbers must be selected with the Case Control command (RANDOM=SID). </p>
            </li>
            <li>
               <p class="para_item">For auto spectral density, J=K, X must be greater than zero and Y must be equal to zero. </p>
            </li>
            <li>
               <p class="para_item">For TID=0, <em>G</em>(<em>F</em>)=1.0. 
               </p>
            </li>
            <li>
               <p class="para_item">RANDPS may only reference subcases included within a single loop (a change in direct matrix input is not allowed). </p>
            </li>
            <li>
               <p class="para_item">See the <a class="links" href="javascript:void(0)" onclick="top.popUpPage('QRG/linkInter_target_not_resolved.html#adv_dyn:ref86112:-aux,-home','linkInter','menubar=yes,status=yes,resizable=yes,toolbar=yes,scrollbars=yes,location=no,directories=no');return(false);"> <em>NX Nastran Advanced Dynamic Analysis User&rsquo;s Guide</em></a> for a discussion of random analysis. 
               </p>
            </li>
            <li>
               <p class="para_item">In the case of cyclic symmetry Solution Sequence 118, J and K must refer to the coded subcase IDs.  See <a class="links" href="javascript:void(0)" onclick="top.popUpPage('User/index.html?goto=User/25ref23140c_21.html&vars=-aux,-home','linkInter','menubar=yes,status=yes,resizable=yes,toolbar=yes,scrollbars=yes,location=no,directories=no');return(false);">&ldquo;Using Cyclic Symmetry&rdquo; </a>in the <em>NX Nastran User&rsquo;s Guide</em> for the coding procedure. 
               </p>
            </li>
            <li>
               <p class="para_item">In superelement analysis, J and K must refer to the superelement subcases.  For example, if superelement 10 has SUBCASEs 1 and 2 and superelement 20 has SUBCASEs 3 and 4, then a separate RANDPS entry is required for each superelement, even though X, Y, and TID may be identical. </p>
            </li>
            <li>
               <p class="para_item">For uncoupled PSDF (no J &lt; K entries) only one J=K entry is allowed for unique value of J.  For coupled PSDF (some J &lt; K entries) any number of entries are allowed. </p>
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