Forcing Frequencies dialog box (Acoustics BEM)

This modeling object lets you specify forcing frequencies for a frequency response analysis.

Modeling Object
Name	Defines the modeling object name.
Label	Specifies a unique numerical identifier for the modeling object.
Properties
Description	Lets you enter a brief description. Click to open a text editor where you can enter a longer description.
Frequency List
Frequency List Form	Specifies the form to use in frequency response solutions.
Frequency List	Appears when Frequency List Form is set to Individual Frequencies.Specifies the frequency unit. Hz is the default.
Frequency List box	Appears when Frequency List Form is set to Individual Frequencies.Lets you specify as many frequencies as you need.Enter the frequencies to include. Separate them by commas or spaces.You can also Cut, Copy, and Paste the frequencies.
Linear Sweep Defined by	Appears when Frequency List Form is set to Linear Sweep.Specifies the frequency range.Step ValueLets you set values for Start Frequency, End Frequency After, and Step Value.Note: When the End Frequency After value does not fit into the sweep definition, the software includes the next valid frequency in the frequency list. For example, if Start Frequency is 100,End Frequency After is 200, and Step Value is 75, the software exports 100, 175, and the next valid frequency, which is 250.If the Step Value is greater than the difference of Start Frequency and End Frequency After, the software will create two solution frequencies: Start Frequency and Start Frequency + Step Value. Number of StepsLets you set values for First Frequency, Step Value, and Number of Steps.RPMDefines the forcing frequencies by RPM.Number of StepsLets you set values for First RPM, RPM Step Value, and Number of Steps.Step ValueLets you set values for Start RPM, End RPM After, and RPM Step Value.Note: When the End RPM After value does not fit into the sweep definition, the software includes the next valid frequency in the frequency list. For example, if Start RPM is 1000,End RPM After is 1250, and Step Value is 150, the software exports 1000, 1150, and the next valid frequency, which is 1300.If the Step Value is greater than the difference of Start RPM and End RPM After, the software will create two solution frequencies: Start RPM and Start RPM + Step Value.
Logarithmic Sweep Defined by	Appears when Frequency List Form is set to Logarithmic Sweep.Specifies the frequency range.BaseLets you set values for Start Frequency, End Frequency After, and Base of Logarithm.Note: When the End Frequency After value does not fit into the sweep definition, the software includes the next valid frequency in the frequency list. For example, if Start Frequency is 100,End Frequency After is 200, and Base of Logarithm is 75, the software exports 100, 175, and the next valid frequency, which is 250.When the End Frequency After value is greater than Start Frequency, the software generates one interval.IntervalLets you set values for First Frequency, Last Frequency, and Number of Logarithmic Intervals.
Lower Center Frequency	Appears when Frequency List Form is set to Octave, 1/3 Octave, or 1/12 Octave.Lets you enter the lower center frequency value of the frequency range.
Upper Center Frequency	Appears when Frequency List Form is set to Octave, 1/3 Octave, or 1/12 Octave.Lets you enter the upper center frequency value of the frequency range.
Limit Frequency Range	Appears when Frequency List Form is set to Use Frequencies from All Loads.Uses the frequency-dependent loads defined in Frequency Excitation Set(s) to extract forcing frequencies from all the subcases.Enter values in the From and To boxes to limit the range of the forcing frequencies.For more information about Frequency Excitation Set, see Frequency Excitation Set.
Advanced
Frequency Tolerance	The Frequency Tolerance is a filter for duplicate RPMs or orders.The software uses the frequency tolerance value to discard forcing frequencies that are inside the tolerance. For example, if the frequency tolerance value is set to 1 Hz and the software finds the 20.1 Hz and 20.8 Hz forcing frequencies, the software will filter out the 2nd frequency.

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Forcing Frequencies dialog box (Acoustics BEM), 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 } });