Peakout Frequencies Plots scenario

The Peakout Frequencies Plots scenario displays function plots (XY plots) with markers at the peakout frequencies, computed from user-defined criteria. You can add or delete markers and copy them to the clipboard.

You can also create a Forcing Frequencies modeling object from the data. A Forcing Frequencies modeling object specifies the list of forcing frequencies to be solved in frequency response problems (SOL 108 Direct Frequency Response and SOL 111 Modal Frequency Response).

For more information about using Forcing Frequencies modeling objects, see Specifying forcing frequencies for a frequency response analysis.

Data definitions

When you create a Peakout Frequencies Plots scenario, you can define a response function of vibrations or pressure.

• VibrationsIncludes displacement, velocity, acceleration, rotation, angular velocity, and angular acceleration.

• PressureIncludes dB or dBA.

You can also filter the results using a PEAKOUT Criteria modeling object or specify the filtering yourself. For more information about PEAKOUT Criteria modeling objects, see Limiting frequency response output to peak responses.

Defining and deleting markers

You can use the probing tools in Functions and Graphing to define additional markers indicating frequencies and delete the markers that the Peakout Frequencies Plots scenario created.

For more information about working with markers, see Probe data points on a curve.

Note:

If you plot another scenario, the markers you define are deleted.

Copying list of frequencies

You can also copy the frequencies of the markers in the Peakout Frequencies Plots scenario to the clipboard. For example, you can use the copied frequencies to create a Forcing Frequencies modeling object yourself.

• Right-click an axis on a plot created from a Peakout Frequencies Plots scenario, and choose Peakout Frequencies Plots→Copy Frequencies of Markers to Clipboard.

Creating a Forcing Frequencies modeling object from markers

You can create a Forcing Frequencies modeling object from the markers in the Peakout Frequencies Plots scenario. The Forcing Frequencies modeling object defines a set of frequencies to be used in the solution of frequency response problems using the Individual Frequencies (FREQ) type of Frequency List.

• Right-click an axis on a plot created from a Peakout Frequencies Plots scenario, and choose Peakout Frequencies Plots→Create Forcing Frequencies from Markers.The new Forcing Frequencies modeling object appears in the Modeling Objects container of the Simulation Navigator. It is named PEAKOUT X Frequencies1, where X is the number of frequencies. For example, if five frequencies exist, the name of the Forcing Frequencies modeling object is PEAKOUT 5 Frequencies1.

To use the Forcing Frequencies modeling object in a SOL 108 Direct Frequency Response or SOL 111 Modal Frequency Response solution, you could do the following:

1. Clone the current solution.

2. Remove the forcing frequencies.

3. Add the Forcing Frequencies modeling object you created from the Peakout Frequencies Plots scenario.

4. Solve the solution.

Parameters

The following table lists the parameters available for defining Peakout Frequencies Plots post-processing scenarios. They appear in the Parameters node of the Scenario Based Data-Visualization Navigator.

Parameter	Description
For Values Below: Use PEAKOUT Criteria Modeling Object	Uses a PEAKOUT Criteria modeling object to filter the results.If you clear this check box, you can specify the filters.
PEAKOUT Criteria Modeling Objects	Available when the For Values Below: Use PEAKOUT Criteria Modeling Object check box is selected.Specifies the PEAKOUT Criteria modeling object to use to filter the results.When you select this node in the Scenario Based Data-Visualization Navigator, a list of PEAKOUT Criteria modeling objects appears in the PEAKOUT Criteria Modeling Objects panel at the bottom of the navigator. Select the modeling object to use.For more information about PEAKOUT Criteria modeling objects, see Limiting frequency response output to peak responses.
The following options are available when the For Values Below: Use PEAKOUT Criteria Modeling Object check box is cleared. The values are the same values you use to specify a PEAKOUT Criteria modeling object.
Maximum Number of Peaks	Sets the number of peak responses to select from the resonances that remain after the Minimum Distance between Peaks, Maximum Distance between Peaks, Starting Frequency, and Ending Frequency criteria are applied to the frequency response results.
Minimum Distance between Peaks	Sets the minimum allowable frequency difference between adjacent peak responses.
Maximum Distance between Peaks	Sets the value that is used to create frequency ranges that are centered around each resonance that is retained after applying the Starting Frequency, Ending Frequency, Minimum Distance between Peaks, Maximum Number of Peaks, and minimum cutoffs for individual DOF criteria. The span of these frequency ranges is twice the value that you specify in the Maximum Distance between Peaks box. If a resonance was discarded because of the requested number of peaks criterion, but the discarded resonance lies outside these frequency ranges, it is recovered and added to the peak responses.For a detailed explanation of how the software applies this criterion, see the remarks for the FAR field in the PEAKOUT bulk entry.
Starting Frequency	Sets the frequency below which the frequency response results are excluded from the set of frequencies at which peak responses occur.
Ending Frequency	Sets the frequency above which the frequency response results are excluded from the set of frequencies at which peak responses occur.
Pressure Unit	Specifies the unit of measurement for the sound pressure level cutoff (dB, dBA, or Pressure Unit).
Minimum Cutoff Sound Pressure Level	Available when Pressure Unit is set to dB or dBA.Sets the sound pressure level below which resonances are excluded from the set of frequencies at which peak responses occur.
Minimum Cutoff Response Level	Available when Pressure Unit is set to Pressure Unit.Sets the sound pressure level below which resonances are excluded from the set of frequencies at which peak responses occur.

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Peakout Frequencies Plots scenario, Simcenter 3D 2021.1 Series

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