Boundary conditions > Structural constraints > Nastran, Simcenter 3D Multiphysics, Abaqus, ANSYS, and LS-DYNA structural constraints > Enforced acceleration (Nastran)
Define an enforced acceleration constraint normal to the model
The Normal type lets you define an enforced acceleration constraint with a magnitude and a +/– direction normal to the selected geometry or element faces.
Choose Home tab→Loads and Conditions group→Enforced Acceleration .
In the Enforced Acceleration dialog box, select Normal from the Type list.
In the Model Objects group, click Select Object and select the geometry or FE entity to which the acceleration constraint will be applied.
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 an acceleration constraint magnitude that varies with frequency or time. For more information, see Using fields and expressions to define boundary conditions.
Click OK.The constraint is applied to the model.
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Enforced acceleration (Nastran)
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Define an enforced acceleration constraint normal to the model, Simcenter 3D 2021.1 Series
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Source: https://docs.sw.siemens.com/en-US/doc/289054037/PL20200601120302950.advanced/id623321 · retrieved 2026-07-17