Defining Design Variables

Design variables for shape optimization are defined when assigning a node group to the design area.

This task shows you how to:

See Also
In Other Guides
DV_SHAPE

Define a Design Variable in Tosca Structure.gui

  1. Choose Command | DV_SHAPE in Tosca Structure.pre.
  2. In the DV_SHAPE dialog, select a node group and assign an ID_NAME for further reference to the definition.

Define a Design Variable in the SIMULIA Tosca Structure Parameter File

To define Design variables in the parameter file use the DV_SHAPE command.
Each DV_SHAPE definition has a name (ID_NAME parameter) and references a previously defined node group (ND_GROUP parameter). The name is required to subsequently activate the DV_SHAPE definition when specifying the optimization job (see OPTIMIZE command). The design area is specified by the node group. These two declarations are mandatory. Other declarations cannot be made.

A typical DV_SHAPE command appears as follows: 


DV_SHAPE
 ID_NAME        = design_variables
 ND_GROUP       = design_nodes
END_

DRESP
 ID_NAME        = DRESP_SIG
 DEF_TYPE       = SYSTEM
 TYPE           = SIG_MISES
 UPDATE         = EVER
 EL_GROUP       = ALL_ELEMENTS
 GROUP_OPER     = SUM
END_

DRESP
 ID_NAME        = DRESP_VOL
 DEF_TYPE       = SYSTEM
 TYPE           = VOLUME
 UPDATE         = EVER
 EL_GROUP       = ALL_ELEMENTS
 GROUP_OPER     = SUM
END_

OBJ_FUNC
 ID_NAME        = minimize_stress
 DRESP          = DRESP_SIG
 TARGET         = MIN
END_

CONSTRAINT
 ID_NAME        = volume_constraint
 DRESP          = DRESP_VOL
 MAGNITUDE      = REL
 EQ_VALUE       = 0.45
END_

OPTIMIZE
 ID_NAME        = topology_optimization
 DV             = design_variables
 OBJ_FUNC       = minimize_stress
 CONSTRAINT     = volume_constraint
 STRATEGY       = SHAPE_CONTROLLER
END_