cmacel#

Inertia.cmacel(cm_name='', cmacel_x='', cmacel_y='', cmacel_z='', **kwargs)#

Specifies the translational acceleration of an element component

Mechanical APDL Command: CMACEL

Parameters:
cm_namestr

The name of the element component.

cmacel_xstr

Acceleration of the element component CM_NAME in the global Cartesian X, Y, and Z axis directions, respectively.

cmacel_ystr

Acceleration of the element component CM_NAME in the global Cartesian X, Y, and Z axis directions, respectively.

cmacel_zstr

Acceleration of the element component CM_NAME in the global Cartesian X, Y, and Z axis directions, respectively.

Notes

The cmacel command specifies the translational acceleration of the element component in each of the global Cartesian (X, Y, and Z) axis directions.

Components for which you want to specify acceleration 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.

To simulate gravity (by using inertial effects), accelerate the structure in the direction opposite to gravity. For example, apply a positive CMACELY to simulate gravity acting in the negative Y direction. Units are length/time 2.

You can define the acceleration for the following analyses types:

  • Static ( antype,STATIC)

  • Harmonic ( antype,HARMIC), full, VT [ CMACEL_FN_VT_KRY ], Krylov [ CMACEL_FN_VT_KRY ], or mode-superposition [ CMACEL_mode-sup_LVSCALE ] method

  • Transient ( antype,TRANS), full or mode-superposition [ CMACEL_mode-sup_LVSCALE ] method

  • Substructure ( antype,SUBSTR)

Loads for VT and Krylov methods are supported as long as they are not:

  • complex tabulated loads (constant or trapezoidal loads in tabulated form are supported)

  • used in conjunction with Rotordynamics ( coriolis,on).

In a mode-superposition 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 file, which you can apply via the lvscale command.

Accelerations are combined with the element mass matrices to form a body-force load vector term. Units of acceleration and mass must be consistent to give a product of force units.

The cmacel command supports tabular boundary conditions (TABNAME_X, TABNAME_Y, and TABNAME_Z) for CMACEL_X, CMACEL_Y, and CMACEL_Z input values ( dim ) as a function of both time and frequency for full transient and harmonic analyses.

Related commands for inertia loads are acel, cgloc, cgomga, dcgomg, domega, omega, cmomega, and cmdomega.

See Analysis Tools

This command is also valid in prep7.