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<a name = "hj-top"> </a><table class = "table1" id = "table11"><tr><td><table class = "DocHeader"><tr><td class = "DocHeader1" colspan = "2"><h1>Correcting the Error in the Analysis Model</h1></td></tr><tr><td class = "DocHeader4" colspan = "2"/></tr><tr><td class = "DocHeader3" colspan = "2"><table class = "DocThemeIntro" id = "table12"><tr><td class = "Intro1Only"><p class = "header"><p class = "abstract"><span class = "shortdesc">If the results file of the FE program has not been generated, the following
      error message appears: </span>

    <a class = "xref" href = "../TsoUserImages/trouble_err_analysis_mod.png">Error message</a>
    <p>Cause:</p>
    <ul class = "ul">
      <li class = "li"> Error in the analysis model </li>
    </ul>
  </p>
<p>This task shows you how to:
					</p><ul><li><a href = "#tso-t-usr-trouble-progAbFeAn-corrErrAnMod-locErr" id = "toc_rg" title = "">Locate the Error</a></li><li><a href = "#tso-t-usr-trouble-progAbFeAn-corrErrAnMod-corrErr" id = "toc_rg" title = "">Correct the Error</a></li></ul>
</p></td></tr></table></td></tr></table>
  

  

  <article class = "topic task nested1" aria-labelledby = "ariaid-title2" id = "tso-t-usr-trouble-progAbFeAn-corrErrAnMod-locErr">
    <h2 class = "title topictitle2">Locate the Error</h2>

    <div class = "body taskbody">
      <section><ol class = "ol steps"><li class = "li step">
          
            Validate the analysis model using a simple FE analysis (not using optimization-specific entries)
          
        </li><li class = "li step">
          Check if all necessary files for the optimization have been created (for example,
op2 file from <span class = "ph">MSC Nastran®</span>) and check the optimization-specific entries in
the analysis model. vol.2 chapter 11 gives a description of the required FE
program-specific settings.
          
        </li></ol></section>
    </div>

  </article>

<article class = "topic task nested1" aria-labelledby = "ariaid-title3" id = "tso-t-usr-trouble-progAbFeAn-corrErrAnMod-corrErr">
    <p><map name = "FPMap1"><area href = "#hj-top" title = "Back to Top" shape = "rect" coords = "416, 0, 435, 10"/></map><span class = "itemsprite"/></p><h2 class = "title topictitle2">Correct the Error</h2>

    <div class = "body taskbody">
      <section><div class = "li step p">
          
            Modify the analysis model.
          
        <p>
            <div class = "note collapse"><span class = "run-in.note">Note:
    		</span><span class = "notecontent"> In topology optimization in combination with <span class = "ph">MSC Nastran®</span>, the solver might stop due to problems with the pivot
              ratio of the stiffness matrices. <br/><img class = "image" src = "../TsoUserImages/trouble_err_analysis_mod_rem.png"/><br/>This could be solved (see <a class = "xref" href = "tso-c-usr-solver-mscNastran-files.htm#tso-c-usr-solver-mscNastran-files" title = "Within this section supported file formats are discussed.">Files and Formats</a>) by
              changing the MAXRATIO parameter in the bulk data section of the input file like, for
              example: <code class = "ph codeph">PARAM,MAXRATIO,10.E10</code></span></div>

          </p>
        </div></section>
    </div>

  </article>
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