Frequency Excitation Set (Simcenter Samcef)

Use a Frequency Excitation Set to define a frequency-dependent dynamic load or enforced motion load for use in a Linear Harmonic Response Analysis.

Specifically, a Frequency Excitation Set lets you define the frequency-based excitation law, which is a unitless function P(f) of the loading frequency f:

F(f) = load × P(f)

where:

• F(f) is the complete frequency-dependent loading

• P(f) is the excitation law

• load is the constant coefficient

Each constant load is multiplied by P(f) to create the frequency-dependent loading function F(f)=load× P(f), which has the same measurement unit as the constant load. Thus, all loading functions F(f) = load × P(f) that belong to an excitation set are characterized by the same frequency dependence P(f).

To create and use a Frequency Excitation Set, you must do the following:

• Define the value of the excitation as a function of frequency using any of the following:A constant or complex expressionA constant or magnitude and phase expressionA fieldNote: You can also define a function for use in cyclic symmetry analyses. The function describes the tangential evolution of the load. The X-axis is defined in degrees from 0 to 360, and the function is exported as a table. For more information, see the FSC parameter of the Samcef .SOD command.

• Assign a load set to the excitation set to ensure that the static and enforced loads are applied according to the excitation function.You can assign only one load set to an excitation set. To give you flexibility in applying loads to your dynamic response analysis, you can reuse a load set in different excitation sets.

• Add the Frequency Excitation Set to a subcase in the Linear Harmonic Response Analysis.

Corresponding Simcenter Samcef syntax

The Frequency Excitation Set corresponds to the Simcenter Samcef .SOL / .SOD commands. For more information, see the Samcef .SOD command or the .SOL command.

Where do I find it?

Application	Pre/Post
Prerequisite	Simcenter Samcef as the specified solverStructural as the analysis typeLinear Harmonic Response Analysis as the solution type
Simulation Navigator	Right-click Solver Sets→New→Frequency Excitation Set

How do I

Create an excitation set for a dynamic response analysis (Simcenter Samcef)

Learn more

Load Set (General) (Simcenter Samcef)

Transient Excitation Set (Simcenter Samcef)

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 Samcef), Simcenter 3D 2021.1 Series

© 2020 Siemens

window.mainLanguage="en_US"

window.delivId=""

window.projectId=""

MathJax.Hub.Config({ TeX: { extensions: ["autoload-all.js"] }, tex2jax: { displayMath: [ ] }, "SVG": { scale: 125 } });