Forcing Frequencies dialog box (Noise and Vibration)

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.Number of StepsLets you set values for First Frequency, Step Value, and Number of Steps.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 exports only the two frequencies: Start Frequency and Start Frequency + Step Value.
Linear Sweep by RPM Defined by	Appears when Frequency List Form is set to Linear Sweep by RPM.Specifies the forcing frequencies for an order-cut solution step or subcase from an RPM sweep. Each order-cut subcase may have different forcing frequencies. The software extracts the order number from the solution step name and uses the order number to find the RPMs and their related frequencies.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 RPM in the RPM list.For example, if Start RPM is 100,End RPM After is 200, and RPM Step Value is 75, the software uses 100, 175, and the next valid RPM, which is 250, to find related forcing frequencies.If the Step Value is greater than the difference of Start RPM and End RPM After, the software searches for frequencies at only the two RPMs: 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.IntervalLets you set values for First Frequency, Last Frequency, and Number of Logarithmic Intervals.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.
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.Use Frequencies from All Loads combines all the frequencies defined for the solution and all subcases. When the same forcing frequencies exist at the subcase levels and solution level, the subcase setting takes priority over the solution. You can have multiple combinations of forcing frequencies on the subcase level. The software then creates a union of the defined frequencies.Enter values in the From and To boxes to limit the range of the forcing frequencies.
AdvancedAppears when Frequency List Form is set to Linear Sweep by RPM.
Frequency Tolerance	The software uses the frequency tolerance value to discard forcing frequencies that fall within the tolerance.For example, if the frequency tolerance value is set to 1 Hz and the software finds 200 Hz and 200.9 Hz forcing frequencies, the software filters out the second frequency.

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Forcing Frequencies dialog box (Noise and Vibration), Simcenter 3D 2021.1 Series

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