Enforced acceleration constraint (ANSYS)

Use the Enforced Acceleration Constraint command to define translational accelerations to a model. For example, you can use the Enforced Acceleration Constraint command to simulate a gravitational load by applying a translational acceleration in the direction opposite to gravity. For each degree-of-freedom, you can define the acceleration as a constant value, or you can use a field to define an acceleration that varies with time or frequency. The options in the Acceleration dialog box correspond to the variables for the ANSYS CMACEL and CMDOMEGA commands.

Note:

When you define an enforced acceleration constraint on geometry, a local coordinate system is created and applied to the underlying nodes. If local coordinate systems already exist at these nodes, the constraint's coordinate system may overwrite them. For example, if you define a constraint on a location where spring elements are defined, the constraint's coordinate system may overwrite the spring element definitions.

Limitations

• Pre/Post only supports enforced acceleration constraints that are defined in the global coordinate system. If you import these constraints and they are defined in a different coordinate system, Pre/Post transforms them to the global system.

• Pre/Post supports the definition of the direction vector for the rotational axis (X1, Y1, Z1 and X2, Y2, Z2) for these constraints. During import, Pre/Post creates a new coordinate system that is parallel to the global coordinate system with its origin located at the X1, Y1, Z1 points defined in the input file for the constraint.

Where do I find it?

Application	Pre/Post
Prerequisite	A Simulation file as the work part and displayed partANSYS as the specified solverStructural as the analysis type and Linear Statics, Nonlinear Statics, Harmonic Full Method, Harmonic Mode Superposition, Transient Dynamic Full Method, or Transient Dynamic Mode Superposition as the solution type
Command Finder	Enforced Acceleration Constraint

Learn more

Contact interference (Abaqus)

Constrained keywords for rigid body creation (LS-DYNA)

Fixed and free boundary degrees of freedom (Nastran, ANSYS, and Abaqus)

Initial forces on beam element axes (LS-DYNA)

Initial stress (LS-DYNA)

Initial velocity (LS-DYNA)

Rigid wall definition (LS-DYNA)

Single point constraints for boundary nodes (LS-DYNA)

Enforced velocity constraint (ANSYS)

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Enforced acceleration constraint (ANSYS), Simcenter 3D 2021.1 Series

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