General Parameters

Parameters that are valid for both controller and sensitivity-based optimization are explained.

This page discusses:

See Also
In Other Guides
OPT_PARAM

Each command has a unique name (ID_NAME parameter) and references a previously defined optimization job (OPTIMIZE parameter). The specified parameters only relate to the given optimization task. A typical command appears as follows:


OPT_PARAM
 ID_NAME  = param_for_bead_optimization
 OPTIMIZE = bead_optimization
 ...
END_

The following parameters might be set in bead optimization:

BEAD_CONTROLLER

  • Direction of the optimization displacement
  • Update of normal vectors (optimization displacement vector)
  • Influence on bead width
  • Number of iterations
  • Minimum stress for an optimized area
  • Maximum membrane stress for an optimized area
  • Mesh enhancing parameters

BEAD_SENSITIVITY

  • Filtering of sensitivities
  • Move limit
  • CSA asymptote update
  • Sensitivity calculation

Important:
  1. The parameters for controller are ignored for the sensitivity-based algorithm and vice versa.
  2. The command is also used in shape and topology optimization. However, the optimization parameters that can be set depend on the given type of optimization. The only parameters that can be set here are those allowable for bead optimization. Topology and shape optimization parameters cannot be used.
  3. BEAD_WIDTH and BEAD_ITER have no effect in sensitivity-based optimization. Therefore, always define a STOP-command; ITER_MAX = 20 is recommended.

Realization in Tosca Structure.gui

This example shows a BEAD_CONTROLLER Example of setting the SCALE parameter for controller-based bead optimization:

Select Command > OPT_PARAM:

Example of setting the FILTER_RADIUS parameter for sensitivity-based bead optimization: