cmdomega

Mapdl.cmdomega(cm_name='', domegax='', domegay='', domegaz='', x1='', y1='', z1='', x2='', y2='', z2='', **kwargs)

Specifies the rotational acceleration of an element component about a

APDL Command: CMDOMEGA user-defined rotational axis.

Parameters
cm_name,

The name of the element component.

domegax, domegay, domegaz

If the X2, Y2, Z2 fields are not defined, DOMEGAX, DOMEGAY, and DOMEGAZ specify the components of the rotational acceleration vector in the global Cartesian X, Y, Z directions.

x1, y1, z1

If the X2, Y2, Z2 fields are defined, X1, Y1, and Z1 define the coordinates of the beginning point of the rotational axis vector. Otherwise, X1, Y1, and Z1 are the coordinates of a point through which the rotational axis passes.

x2, y2, z2

The coordinates of the end point of the rotational axis vector.

Notes

Specifies the rotational acceleration components DOMEGAX, DOMEGAY, and DOMEGAZ of an element component CM_NAME about a user-defined rotational axis. The rotational axis can be defined either as a vector passing through a single point, or a vector connecting two points.

You can define the rotational acceleration and rotational axis with the CMDOMEGA command for STATIC, HARMIC, TRANS, and SUBSTR analyses. Rotational velocities are combined with the element mass matrices to form a body force load vector term. Units are radians/time2.

The CMDOMEGA command supports tabular boundary conditions (%TABNAME_X%, %TABNAME_Y%, and %TABNAME_Z%) for CMDOMEGA_X, CMDOMEGA_Y, and CMDOMEGA_Z input values (*DIM) for full transient and harmonic analyses.

Related commands are ACEL, CGLOC, CGLOC, OMEGA, CMOMEGA, DCGOMG, DOMEGA.

See Analysis Tools in the Mechanical APDL Theory Reference for more information.

You can use the CMDOMEGA command in conjunction with any one of the following two groups of commands, but not with both groups simultaneously:

Components for which you want to specify rotational loading must consist of elements only. The elements you use cannot be part of more than one component, and elements that share nodes cannot exist in different element components. You cannot apply the loading to an assembly of element components.

In a modal harmonic or transient analysis, you must apply the load in the modal portion of the analysis. Mechanical APDL calculates a load vector and writes it to the mode shape file, which you can apply via the LVSCALE command.

See Acceleration Effect in the Mechanical APDL Theory Reference for more information.

This command is also valid in PREP7.