Frequency Excitation Set

Use a Frequency Excitation Set to define a frequency-dependent dynamic load for use in a frequency response analysis.

You can define the value of the excitation as a function of frequency, using any of the following:

• A complex expression

• A magnitude and phase expression

• A field

You can also define dynamic load phase leads and time delay in the Frequency Excitation Set dialog box.

Adding loads to a Frequency Excitation Set

You cannot add individual loads to a dynamic load set, but you can add a static load set, and add individual loads to that.

• You can add an Applied Load type of static load set only to a frequency excitation load set of type Applied Load.

• You can add an Enforced Motion type of static load set only to a frequency excitation load set of type Enforced Displacement, Enforced Velocity, or Enforced Acceleration. The type of motion created by an Enforced Motion Load is specified by the type of frequency excitation load set into which you place the static load.

• You can add an Enforced Acoustic Pressure type of static load set only to a frequency excitation load set of type Enforced Acoustic Pressure.

Adding a static load set to a Frequency Excitation Set

• When the Automatic Creation check box is selected, the software automatically creates an empty Load Set (General) and adds it to the Frequency Excitation Set.

• When the Automatic Creation check box is cleared, you can choose a static load set from the list, or choose None and create your own, empty Load Set (General).

Corresponding Nastran Syntax

The Frequency Excitation Set corresponds to the Simcenter Nastran RLOAD1 bulk entry.

The Label field in the Frequency Excitation Set dialog box assigns the SID or load set identification number for Simcenter Nastran.

Where do I find it?

Application	Pre/Post
Prerequisite	Simcenter Nastran, MSC Nastran, or Simcenter 3D Multiphysics as the specified solver
Simulation Navigator	Right-click Solver Sets→New→Frequency Excitation Set

How do I

Create a load set

Add a load to a load set

Learn more

Load sets

Load Set (General)

Acoustic Load Set

Acoustic Source Load Set (Legacy)

Transient Excitation Set

Bolt Load Set

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Frequency Excitation Set, Simcenter 3D 2021.1 Series

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