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Boundary conditions > Structural constraints > Nastran, Simcenter 3D Multiphysics, Abaqus, ANSYS, and LS-DYNA structural constraints > Enforced acceleration (Nastran)

Define an enforced acceleration constraint using magnitude and a single direction

The Magnitude and Direction type lets you define an acceleration constraint with a magnitude and a single direction.

  1. Choose Home tab→Loads and Conditions group→Enforced Acceleration .

  2. In the Enforced Acceleration dialog box, select Magnitude and Direction from the Type list.

  3. In the Model Objects group, click Select Object and select the geometry or FE entity to which the acceleration constraint will be applied.

  4. In the Direction group, select a vector that specifies the direction of the acceleration constraint. See Vector dialog box for more information.

  5. In the Magnitude group, define the acceleration constraint magnitude in one of these ways:Select Expression to use a constant value or expression to define the magnitude. For more information, see Expressions. Select Field to define acceleration constraint magnitude that varies with frequency or time. For more information, see Using fields and expressions to define boundary conditions.

  6. Click OK.The constraint is applied to the model.

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Define an enforced acceleration constraint using magnitude and a single direction, Simcenter 3D 2021.1 Series

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Source: https://docs.sw.siemens.com/en-US/doc/289054037/PL20200601120302950.advanced/id623316 · retrieved 2026-07-17