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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>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 = "Intro1"><p class = "header"><p class = "abstract">
    <span class = "shortdesc">Each optimization task is based on one or more finite element
analysis models. These models form the basis for the optimization, that is,
contain the nodes or elements to be changed and the loads and boundary
conditions for the calculation of important terms for the optimization. </span>

    <p>Further, node and element groups or coordinate systems in the analysis
files are available for further definitions in the optimization task.
Additional files might contain objects for the definition of constraints
or provide supplementary analysis results to be considered in the optimization.
 This chapter deals with requirements for optimizable models and discusses
the loading of models. Further, the definition of groups and coordinate
systems in your optimization environment is explained.</p>
  </p>

</p><hr class = "header"/></td></tr><tr><td class = "Intro2"><span class = "run-in">In this section:</span><br/><ul class = "ulthemes"><li><a title = "When defining a model for analyzing, the selection and definition of the loads and boundary conditions should be constructed with special consideration because an incorrectly defined or forgotten load or support might have a very pronounced effect on the result of the optimized structure." href = "tso-m-usr-model-opt-sb.htm">Models for Optimization</a></li><li><a title = "This section describes which element types are allowed for optimization with SIMULIA Tosca Structure." href = "tso-c-usr-model-elemTypes.htm">Optimizable Element Types</a></li><li><a title = "Preprocessing of a finite element analysis might be performed in various preprocessing systems. To be able to use Tosca Structure in a familiar environment, Tosca Structure offers several preprocessing interfaces." href = "tso-m-usr-model-preProcModel-sb.htm">About Preprocessing FE Models for Optimization</a></li><li><a title = "All FE models used for the optimization can be loaded using the FEM_INPUT command in Tosca Structure.gui." href = "tso-m-usr-model-dataLoad-sb.htm">About Loading FE Data</a></li><li><a title = "The parameter files can consist of several parts which can be encapsulated in separate files. These files are referenced in the actual parameter file (jobname.par) with the command INCLUDE." href = "tso-c-usr-model-fileInclude.htm">Include Files</a></li><li><a title = "The definition of groups is a very important function in SIMULIA Tosca Structure. For example, if one or more nodes should be assigned a specific attribute (for example, a restriction), the nodes are first assembled in an object node group. Then the attribute is assigned to the object node group." href = "tso-m-usr-model-groupDef-sb.htm">Group Definition (GROUP_DEF, GROUP_AUTO_DEF)</a></li><li><a title = "The command SELECT provides the user with powerful possibilities to select objects, in particular nodes and elements, without using graphical interaction. The SELECT command can be entered into the parameter file using a text editor or the text view in Tosca Structure.gui." href = "tso-c-usr-model-objSelec.htm">Selection of Objects in Tosca Structure.gui</a></li><li><a title = "In certain situations, the definition of solids and displacement directions requires the coordinate systems that differ from those defined in the FE model." href = "tso-m-usr-model-csDef-sb.htm">Coordinate Systems (CS_DEF)</a></li><li><a title = "In some applications, it is required that the nodes stay in a certain region, or, conversely, are not allowed to enter a certain region during the shape or bead optimization." href = "tso-t-usr-model-solid.htm">Defining Solids (Geometric Primitives)</a></li></ul></td></tr></table></td></tr></table>

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