Enforced motion loads from external files

Use the Enforced Motion from External File command to apply a large number of frequency-dependent enforced motion loads on structural nodes. For the enforced motion loads, you can use either of the following:

• Displacement, velocity, or acceleration results (translational, rotational, or both) from a Simcenter HDF5 file

• Displacement results from a Simcenter Nastran OP2 file that was generated from a previous frequency response analysis.

The nodal displacement coordinate systems of the nodes in the referenced HDF5 or OP2 file and the nodes in your current model must be identical, and the subcases in the referenced HDF5 or OP2 file and solution steps in the current solution must match.

Typically, enforced motion is used when motion is specified instead of, or in conjunction with, applied loads.

In the Enforced Motion from External File dialog box, you enter the path to the HDF5 or OP2 file, choose the geometry or FE entities on which the load will be applied, and specify the subcase ID.

The options in the Enforced Motion from External File dialog box correspond to the fields on the Simcenter Nastran SPCF bulk entry.

Where do I find it?

Application	Pre/Post
Prerequisite	A Simulation file as the work part and displayed partSimcenter Nastran as the specified solverStructural or Vibro-Acoustic as the specified analysis typeIf the Simulation file contains a solution, one of the following as the specified solution type:SOL 108 Direct Frequency Response (Subcase - Direct Frequency)SOL 111 Modal Frequency Response (Subcase - Modal Frequency)
Command Finder	Enforced Motion from External File
Simulation Navigator	Right-click Load Container→New Load→Enforced Motion from External File

Learn more

Static acceleration load

Enforced axial deformations for 1D elements (Nastran)

Distributed Force load

Enforced motion load

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

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Enforced motion loads from external files, Simcenter 3D 2021.1 Series

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