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/time².

You can define the acceleration for the following analyses types:

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.

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.

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 in the Mechanical APDL Theory Reference for more information.

This command is also valid in /PREP7.

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