Enforced motion load

Use the Enforced Motion Load command to create a known displacement to geometry or FE entities in a static or dynamic analysis.

• The Components type lets you define the displacement by the six degrees of freedom relative to a selected coordinate system.

• The Magnitude and Direction type lets you define the magnitude of the displacement in a single direction.

• The Normal type lets you define the constraint by specifying a displacement magnitude and a +/– direction that is normal to the selected geometry or element faces.

Using enforced motions in dynamic analysis

In a dynamic analysis, use the Enforced Motion Load command to also define a known velocity or acceleration.

In Nastran, you use the SPCD bulk data entry to define the enforced motion load. You use the TLOAD1 or TLOAD2 bulk data entries to define a transient response excitation with a reference to the SPCD entries. You define the enforced motion load as a displacement, velocity, or acceleration with the TYPE field in the TLOAD1 or TLOAD2 bulk data entries.

In Pre/Post, you create an Enforced Displacement, Enforced Velocity, or Enforced Acceleration type of Transient Excitation Load Set. You add the enforced motion load to the load set to define the type of motion used.

In Nastran, you use the RLOAD1 or RLOAD2 bulk data entries to define a frequency response excitation with a reference to the SPCD entries. You define the enforced motion load as a displacement, velocity, or acceleration with the TYPE field in the RLOAD1 or RLOAD2 bulk data entries.

In Pre/Post, you create an Enforced Displacement, Enforced Velocity, or Enforced Acceleration type of Frequency Excitation Load Set. You add the enforced motion load to the load set to define the type of motion used.

Where do I find it?

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed part and an active solutionSimcenter Nastran or MSC Nastran as the specified solver
Command finder	Enforced Motion Load

Learn more

Static acceleration load

Enforced axial deformations for 1D elements (Nastran)

Distributed Force load

Enforced motion loads from external files

Fluid Penetration Pressure

Force or moment loads from an external file

Nodal pressure loads (Nastran and ANSYS)

Non-Structural Mass (Nastran)

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

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Enforced motion load, Simcenter 3D 2021.1 Series

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