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      <title>TLOAD1</title>
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      <div class="title_refTopic" id="xps10_pagetitle">TLOAD1 </div>
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      <h4 class="refClassification">Transient Response Dynamic Excitation, Form 1 </h4>
      <p class="para_refTopic">Defines a time-dependent dynamic load or enforced motion of the form </p>
      <p class="para_refTopic"><img align="bottom" src="graphics/bulktuv-equ41.gif" border="0"></p>
      <p class="para_refTopic">for use in transient response analysis. </p>
      <div class="title_refCategory">Format: </div>
      <div class="refCategoryContent">
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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">TLOAD1 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">SID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">EXCITEID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">DELAY </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">TYPE </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">TID </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>
                  <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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               <col span="1" width="10*">
            </colgroup>
            <tbody>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">TLOAD1 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">5 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">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">LOAD </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">13 </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>
            </tbody>
         </table><br></div>
      <div class="title_refCategory">Fields:</div>
      <div class="refCategoryContent">
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                  <th align="left" colspan="1" rowspan="1">
                     <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>
                  </th>
               </tr>
            </thead>
            <tbody>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">SID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Set identification number.  (Integer &gt; 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">EXCITEID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Identification number of DAREA or SPCD entry set or a thermal load set (in heat transfer analysis) that defines <em>A</em>.  See Remarks <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/20topic_26.html#ref13571');return(false);">31-2</a> and <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/20topic_26.html#ref60019');return(false);">31-3. </a> (Integer &gt; 0) 
                     </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">DELAY </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Identification number of DELAY entry set that defines &tau;.  (Integer &ge; 0 or blank) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">TYPE </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Defines the type of the dynamic excitation.  See Remarks <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/20topic_26.html#ref13571');return(false);">31-2</a> and <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/20topic_26.html#ref60019');return(false);">31-3. </a> (Integer, character or blank; Default=0) 
                     </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">TID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Identification number of TABLEDi entry that gives <em>F</em>(<em>t</em>).  (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">Dynamic excitation sets must be selected with the Case Control command DLOAD=SID. </p>
            </li>
            <li><a name="ref13571"></a><p class="para_item">The type of the dynamic excitation is specified by TYPE (field 5) according to the following table: </p>
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                     <tr>
                        <th align="center" colspan="1" rowspan="1">
                           <p class="para_th"><b class="uiTerm">TYPE </b></p>
                        </th>
                        <th align="center" colspan="1" rowspan="1">
                           <p class="para_th"><b class="uiTerm">TYPE of Dynamic Excitation </b></p>
                        </th>
                     </tr>
                  </thead>
                  <tbody>
                     <tr>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">0, L, LO, LOA or LOAD </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">Applied load (force or moment) (Default) </p>
                        </td>
                     </tr>
                     <tr>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">1, D, DI, DIS, or DISP </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">Enforced displacement using large mass or SPC/SPCD data </p>
                        </td>
                     </tr>
                     <tr>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">2, V, VE, VEL or VELO </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">Enforced velocity using large mass or SPC/SPCD data </p>
                        </td>
                     </tr>
                     <tr>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">3, A, AC, ACC or ACCE </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">Enforced acceleration using large mass or SPC/SPCD data </p>
                        </td>
                     </tr>
                  </tbody>
               </table><br></li>
            <li><a name="ref60019"></a><p class="para_item">TYPE (field 5) also determines the manner in which EXCITEID (field 3) is used by the program as described below </p>
               <p class="para_item">Excitation specified by TYPE is applied load </p>
               <ul>
                  <li>
                     <p class="para_item">There is no LOADSET request in Case Control </p>
                     <p class="para_item">EXCITEID may also reference DAREA, static, and thermal load set entries </p>
                  </li>
                  <li>
                     <p class="para_item">There is a LOADSET request in Case Control </p>
                     <p class="para_item">The program may also reference static and thermal load set entries specified by the LID or TID field in the selected LSEQ entries corresponding to the EXCITEID. </p>
                  </li>
               </ul>
               <p class="para_item">Excitation specified by TYPE is enforced motion </p>
               <ul>
                  <li>
                     <p class="para_item">There is no LOADSET request in Case Control </p>
                     <p class="para_item">EXCITEID will reference SPCD entries. If such entries indicate null enforced motion, the program will then assume that the excitation is enforced motion using large mass and will reference DAREA and static and thermal load set entries just as in the case of applied load excitation. </p>
                  </li>
                  <li>
                     <p class="para_item">There is a LOADSET request in Case Control </p>
                     <p class="para_item">The program will reference SPCD entries specified by the LID field in the selected LSEQ entries corresponding to the EXCITEID. If such entries indicate null enforced motion, the program will then assume that the excitation is enforced motion using large mass and will reference static and thermal load set entries corresponding to the DAREA entry in the selected LSEQ entries, just as in the case of applied load excitation. </p>
                  </li>
               </ul>
            </li>
            <li>
               <p class="para_item">EXCITEID may reference sets containing QHBDY, QBDYi, QVECT, and QVOL entries when using the heat transfer option. </p>
            </li>
            <li>
               <p class="para_item">TLOAD1 loads may be combined with TLOAD2 loads only by specification on a DLOAD entry.  That is, the SID on a TLOAD1 entry may not be the same as that on a TLOAD2 entry. </p>
            </li>
            <li>
               <p class="para_item">SID must be unique for all TLOAD1, TLOAD2, RLOAD1, RLOAD2, and ACSRCE entries. </p>
            </li>
            <li>
               <p class="para_item">If the heat transfer option is used, the referenced QVECT entry may also contain references to functions of time, and therefore A may be a function of time. </p>
            </li>
            <li>
               <p class="para_item">If TLOADi entries are selected in SOL 111 or 146 then a Fourier analysis is used to transform the time-dependent loads on the TLOADi entries to the frequency domain and then combine them with loads from RLOADi entries.  Then the analysis is performed as a frequency response analysis but the solution and the output are converted to and printed in the time domain. Please refer to <a class="links" href="javascript:void(0)" onclick="top.popUpPage('QRG/linkInter_target_not_resolved.html#adv_dyn:ref22295:-aux,-home','linkInter','menubar=yes,status=yes,resizable=yes,toolbar=yes,scrollbars=yes,location=no,directories=no');return(false);">&ldquo;Fourier Transform&rdquo;</a> in the <em>NX Nastran Advanced Dynamic Analysis User&rsquo;s Guide</em>. 
               </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">TLOAD1 may be used in a static or transient analysis to specify time-dependent loads. In a nonlinear static analysis, TLOAD1 is frequently used with TSTEP to apply incremental loads to achieve better convergence in the solution. </p>
            </li>
            <li>
               <p class="para_item">SID may be selected directly with the Case Control command DLOAD=SID, or be combined with other TLOAD1 entries in a DLOAD entry. For the latter case, the SID in the DLOAD entry is then selected by the Case Control command DLOAD. </p>
            </li>
            <li>
               <p class="para_item">Only TYPE=0 or 1 is supported. </p>
            </li>
            <li>
               <p class="para_item">For TYPE=0, EXCITEID may reference the SID in a FORCE, FORCE1, FORCE2, MOMENT, MOMENT1, MOMENT2, PLOAD, PLOAD1, PLOAD2, PLOAD4, PLOADX1, GRAV, RFORCE, TEMP, or TEMPD entry. </p>
            </li>
            <li>
               <p class="para_item">For TYPE=1, EXCITED must reference the SID in an SPCD entry. </p>
            </li>
            <li>
               <p class="para_item">Delay is ignored. </p>
            </li>
         </ol>
      </div>
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