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      <title>Check VDA-4955 Compliance Overview</title>
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      <div class="title_topic2" id="xps10_pagetitle">Check VDA-4955 Compliance Overview</div>
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               <p class="para_td">Check VDA-4955 Compliance Overview</p>
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               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('nx_analysis/vda_criteria.html');return(false);">Description of the Check Criteria</a></p>
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               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('nx_analysis/vda_interact.html');return(false);">Checker Process</a></p>
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               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('nx_analysis/vda_config.html');return(false);">Configuration File</a></p>
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               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('nx_analysis/vda_check_ov.html');return(false);">Check Criteria</a></p>
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               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('nx_analysis/vda_select.html');return(false);">Select Geometry Set</a></p>
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               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('nx_analysis/vda_topology.html');return(false);">Topological Information</a></p>
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               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('nx_analysis/vda_analysis.html');return(false);">Analysis Run</a></p>
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               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('nx_analysis/vda_results.html');return(false);">Results Viewing</a></p>
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               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('nx_analysis/vda_file_usage.html');return(false);">External File Usage</a></p>
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      </table><br><p class="para_topic"> <img align="bottom" src="../graphic_library/icons/toolbars/analysis/analysis/check_vda-4955_compliance.gif" border="0"> This option checks data quality according to the checking procedure based on recommendation 4955 (Edition 1, October 1993). Recommendation 4955 has been defined by the VDA working group &quot;Scope and quality of CAD/CAM data&quot; of the &quot;CAD/CAM&quot; council of the VDA (German Car Manufacturer Association).
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            <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
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                  <p class="para_note_body">  The Check VDA-4955 Compliance option is available with the appropriate license under the Analysis pull-down menu.</p>
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      <p class="para_topic">The VDA Checker checks the quality of curves, faces, solids and drawing data in a NX part file. VDA Checker is a NX command controlled through a forms-interface using entries you supply to define the checking environment. You use the command to ensure that your designs adhere to a specified geometrical or organizational quality. You can apply the command before or after you have exchanged data with a foreign system using a standard data exchange interface (such as IGES, VDAFS, or STEP) or during the design in NX.</p>
      <p class="para_topic">You can make the following entries:</p>
      <ul>
         <li>
            <p class="para_item">Criteria to be checked</p>
         </li>
         <li>
            <p class="para_item">Tolerances</p>
         </li>
         <li>
            <p class="para_item">Extent of entity selection</p>
         </li>
         <li>
            <p class="para_item">Extent of logging.</p>
         </li>
      </ul>
      <p class="para_topic">You can save the checking environment into a configuration file, and use it later for further interactive checking runs or for checking runs in batch mode. In accordance with VDA 4955, the following criteria are checked:</p>
      <div class="title_division">Geometrical Quality</div>
      <ul>
         <li>
            <p class="para_item">Maximum degree of curves and faces</p>
         </li>
         <li>
            <p class="para_item">Minimal curvature radius of faces</p>
         </li>
         <li>
            <p class="para_item">Curvature analysis and waviness of faces</p>
         </li>
         <li>
            <p class="para_item">Transition of continuity between curves and between faces (positional continuity, tangential or normal continuity, curvature continuity)</p>
         </li>
         <li>
            <p class="para_item">Waviness of planar curves</p>
         </li>
         <li>
            <p class="para_item">Orientation of the face normal in a face cluster</p>
         </li>
         <li>
            <p class="para_item">Minimal size of patches (these are segments in the NURBS representation)</p>
         </li>
         <li>
            <p class="para_item">Number of patches in one face</p>
         </li>
         <li>
            <p class="para_item">Geometrically identical elements</p>
         </li>
         <li>
            <p class="para_item">Minimal elements (elements of very small size)</p>
         </li>
         <li>
            <p class="para_item">Self-intersection of face boundaries</p>
         </li>
         <li>
            <p class="para_item">Unused patch rows (segments which completely lie outside the active area of underlying surface)</p>
         </li>
         <li>
            <p class="para_item">Identical elements (including embedded elements)</p>
         </li>
         <li>
            <p class="para_item">Self-intersection of curves </p>
         </li>
         <li>
            <p class="para_item">Multiple knots in bspline representation&nbsp; </p>
         </li>
         <li>
            <p class="para_item">Degenerated corners, flapping normals of underlying surfaces </p>
         </li>
         <li>
            <p class="para_item">Extended edge checking (reversed, fragmented, overused, knife shape) </p>
         </li>
         <li>
            <p class="para_item">Solid checking </p>
            <ul>
               <li>
                  <p class="para_item">Tiny </p>
               </li>
               <li>
                  <p class="para_item">Identical </p>
               </li>
               <li>
                  <p class="para_item">Gaps between vertex and face, vertex and edge </p>
               </li>
               <li>
                  <p class="para_item">Unintentional cavities </p>
               </li>
               <li>
                  <p class="para_item">Missing or unused history </p>
               </li>
               <li>
                  <p class="para_item">Multi-solid parts</p>
               </li>
            </ul>
         </li>
      </ul>
      <div class="title_division">Organizational Quality</div>
      <ul>
         <li>
            <p class="para_item">Admissible text fonts</p>
         </li>
         <li>
            <p class="para_item">Model organization</p>
         </li>
         <li>
            <p class="para_item">Documentation of the geometric representation</p>
         </li>
      </ul>
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            <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
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               <div class="para_note">
                  <p class="para_note_body">  The NX part file is not changed during the checking.</p>
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      <div class="title_division">Where do I find it?</div>
      <p class="para_division"><b class="uiTerm">Analysis</b>&rarr; <b class="uiTerm">Check VDA-4955 Compliance</b></p>
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