LINK_TOPO

Definition of symmetry and link conditions for topology optimization.

This page discusses:

ID_NAME

= <id_name_of_link_topo>

Name of the link condition.

TYPE

Type of the link condition.

= POINT_SYM

Point symmetry referring to the origin of the coordinate system.

= PLANE_SYM, AXIS_1

= PLANE_SYM, AXIS_2

= PLANE_SYM, AXIS_3

Plane symmetry referring to the plane which lies perpendicular to the given axis of the coordinate system.

= ROTATION_SYM, AXIS_1

= ROTATION_SYM, AXIS_2

= ROTATION_SYM, AXIS_3

Rotational symmetry referring to the axis of the coordinate system. The angle for the repeating segments might be defined by the user.

= CYCLIC_SYM, AXIS_1

= CYCLIC_SYM, AXIS_2

= CYCLIC_SYM, AXIS_3

Cyclic symmetry definition.

= LINK_SYM

Coupling of single element groups.

CS

= <name_of_cs>

Name of the coordinate system that should be used for the link definitions.

IGNORE_FROZEN

= FALSE

= TRUE

The frozen elements might be excluded from the link definitions.

ANGLE

= <angle>

Angle for the segment repeating. Must be greater than 2°.

TRANSLATION

= <translation>

Translation amount for the segments.

GROUP_MAIN

= <name_of_element_group>

Name of the element group that defines the reference segment.

CS_CHILD

= <name_of_cs_child>

Name of the coordinate system that defines the position of the corresponding segment referring to the GROUP_MAIN element group. Multiple child coordinate systems might be defined. See also figure below.

MAIN

= AUTO

AUTO will switch to MAX for controller-based optimizations and to AVG for sensitivity-based optimizations.

= MAX

The maximum value of the equivalent elements defines the symmetry.

= AVG

The average value of the equivalent elements defines the symmetry.

= GROUP

The reference group overwrites the child groups.

The following figure shows the definition of CS_CHILD for TYPE=LINK_SYM:



Special items for CLIENT parameters

Not all entries are allowed for each parameter as shown in the following table:

POINT_SYM

PLANE_SYM

ROTATION_SYM

CYCLIC_SYM

LINK_SYM

ID_NAME

x

x

x

x

x

TYPE

x

x

x

x

x

CS

x

x

x

x

x

IGNORE_FROZEN

x

x

x

x

x

ANGLE

-

-

x

-

-

TRANSLATION

-

-

-

x

-

GROUP_MAIN

-

-

-

-

x

CS_CHILD

-

-

-

-

x

MAIN

-

-

-

-

x

Examples

LINK_TOPO
 ID_NAME  = PLANE_SYMMETRY
 TYPE = PLANE_SYM, AXIS_2
 CS = CS_0
END_
LINK_TOPO
 ID_NAME  = LINK_CONDITION
 TYPE = LINK_SYM
 CS = CS_0
 GROUP_MAIN = EL_MAIN
 CS_CHILD = CS_CHILD1
 CS_CHILD = CS_CHILD2
END_