DV_SIZING

Definition of the design elements for sizing optimization.

This page discusses:

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Defining Design Variables (DV_SIZING)

ID_NAME

= <id_name_of_dv_sizing>

Name of the DV_SIZING definition.

EL_GROUP

= <name_of_element_group>

Name of the element group.

INITIAL_DV_FIELD

= <name_of_file>

Name of the file with the initial thicknesses distribution field to be used for the optimization.

Remarks

  1. All elements in the element group might be modified during optimization.
  2. Only certain types of elements (for more information see Solver Specific Features) are permitted to be optimization elements. Tosca Structure.sizing supports only single layered shells. All elements not permitted are removed from the group.
  3. The INITIAL_DV_FIELD option is available only for sensitivity-based optimization.
  4. The file applied at INITIAL_DV_FIELD that contains the initial thicknesses distribution field must be located in the start directory of the optimization job. The format of the file must be ONF (Optimization Neutral File). The initial thicknesses distribution field is extracted from the data block 740 with the title ELEMENT_THICKNESS.
  5. When using a thicknesses distribution of a previous optimization run for the new optimization, it is recommended that you rename the file SIZING_XXX.onf (for example, to INITIAL_MAT.onf). Otherwise name conflicts with the running optimization (with newly generated thicknesses distribution files SIZING_XXX.onf) might lead to confusion in the post-processing.
  6. INITIAL_DV_FIELD for sizing optimization means an initial thicknesses distribution.

Examples

DV_SIZING
  ID_NAME  = dv_sizing_name
  EL_GROUP = design_elem_grp
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