Mechanical APDL Basic Analysis Guide - Ansys

Chapter 9: Selecting and Components
9.3.3. Selecting Entities by Component or Assembly
The main advantage of defining a component or an assembly is that you can conveniently select items that
belong to it using a combination of the CMSEL and ALLSEL commands. The CMSEL command selects all
entities belonging to a component or assembly by its name. You can then issue ALLSEL,BELOW to select
all attached lower entities. For example, you can select all elements belonging to the WINDINGS component,
apply a current density loading to all of them, and then select all nodes attached to those elements:
CMSEL,,WINDINGS
BFE,ALL,JS,,-1000
ALLSEL,BELOW,ELEM
You can also use the picker to select components. By choosing Utility Menu> Select> Comp/Assembly>
Pick Comp/Assembly, you can select a defined component and all of the items belonging to it. The item
is displayed in the prompt window during the select process.
For more information about the CMSEL, BFE and ALLSEL commands, and the CMEDIT, CMDELE, and CMLIST
commands mentioned below, see the Command Reference.
9.3.4. Adding or Removing Components
Issuing the CMEDIT command (Utility Menu> Select> Comp/Assembly> Edit Assembly) allows you to
add components to or remove components from an assembly. For example, the following command removes
AIRGAP from the assembly MOTOR:
CMEDIT,MOTOR,DELE,AIRGAP
You can delete a component or assembly definition, using the CMDELE command (Utility Menu> Select>
Comp/Assembly> Delete Comp/Assembly). You can list the entities that make up a particular component
with the CMLIST command (Utility Menu> Select> Comp/Assembly> List Comp/Assembly). You can use
CMLIST to generate expanded, detailed listings of the entities that make up specific components by using
it along with the CMSEL command.
The CMSEL command also allows you to use components to narrow your selection or increase your selection
criteria. Issuing CMSEL,ALL will select all defined components in addition to any items you already have
selected.
9.3.5. Modifying Components or Assemblies
You can modify the specification of a component with the CMMOD command.
If an entity is modified (e.g., via the KMODIF command), that entity may be deleted and then redefined.
The deletion may cause the entity to be removed from the component. If all of the entities are removed
from the component, the component will also be deleted.
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