Time Signal Processing dialog box

If you are using this dialog box in Motion, see Transforming time-domain to frequency for more information.

Operation Name	Type a name for the time signal processing operation.
Input Range Selection
Lets you constrain the input values so you calculate the corresponding frequency domain values only for a selected part of the input time signal. You can use these ranges to filter out unwanted transient or divergent data.
Lower Limit Type****Upper Limit Type	Specifies the type of lower or upper time limit you want to use. You can use either one of the following time limit types:NoneApplies no constraints to the data.TimeConstrains the data to the specified time limits expressed in seconds.For more information, see Additional magnitude options.SamplesConstrains the data with respect to the number of samples. Samples is useful for time data from a motion results file that has results at different engine RPMs or when the results were printed at constant angle intervals.
Signal Repetition
Lets you specify repetition of the time signal before other operations, such as FFT. When you repeat a time signal, you increase the frequency resolution of the FFT.Note: You must ensure the continuity of the resulted time signal.You can either repeat a signal or perform a time segmentation, but you cannot request both.
Enable	Available when the Enable check box in the Time Segmentation group is cleared.Specifies repetitions of the time signal.
Number of Repetitions	Available when the Enable check box is selected.Sets the number of repetitions of the time signal.
Time Segmentation
Enable	Specifies time segmentation for the time signal.
Block Size	Available when the Enable Time Segmentation check box is selected.Sets the number of data values in the time signal that you want to consider over one averaging block. By default, 512 data values form an averaging block.
Overlap (%)	Available when the Enable Time Segmentation check box is selected.Sets the percentage of overlap between neighboring blocks so that the data values at the start and end of the signal are not lost by the FFT operation. By default, no overlap is used, indicated by a value of zero.
Fourier Transform
Enable	Lets you set the options required for processing the FFT operation.
Window Type	Available when the Enable check box is selected.Specifies the type of windowing function that you want to use with the selected input range to make it periodic.Your choice of window type depends on both the aim of the analysis and the type of signal (input time data) that you plan to use.RectangularUse only when the input signal is periodic within the chosen time segment, for example, when you are analyzing special sinusoids whose frequencies coincide with obtained frequencies of the analysis.HanningUse for general purposes.Kaiser-Bessel or BlackmanUse when you need to distinguish between distinct harmonic signals.Flat TopUse for calibration procedures and for those situations where the correct amplitude measurements are important.HammingUse for general purposes when the dynamic range is about 50 dB.
Correction Mode	Available when the Enable check box is selected.Specifies the mode of correction to apply on the windowed signal. Applying a window to a signal distorts it, and applying the correction factors compensates for the distortion. The correction factor that the software applies depends on the specified window type.Window TypeCorrection factorRectangular1Hanning2Hamming1.85Kaiser-Bessel2.49Blackman2.8Flat Top4.18	Window Type	Correction factor	Rectangular	1	Hanning	2	Hamming	1.85	Kaiser-Bessel	2.49	Blackman	2.8	Flat Top	4.18
Window Type	Correction factor
Rectangular	1
Hanning	2
Hamming	1.85
Kaiser-Bessel	2.49
Blackman	2.8
Flat Top	4.18
Advanced
Relative Tolerance (%)	Available when the Enable check box is selected.Lets you specify the relative tolerance to use for the FFT operation. The relative tolerance is useful when the signal contains deviations because it lets you define the limits of the deviations that the pre-solver accepts.
Enforce Frequency Resolution (by 0 padding)	Controls whether to append zero values (also known as zero-padding or post-padding) to the time signal until a specified frequency resolution is achieved. Zero-padding increases the frequency resolution of the FFT. The software executes the zero-padding after the time signal was windowed.
Frequency Resolution	Available when the Enable check box in the Signal Repetition group is cleared, and the Enable and Enforce Frequency Resolution (by 0 padding) check boxes are selected.Sets the frequency resolution.For more information, see Additional magnitude options.
Enable Pre-Padding	Available when the Enable check box in the Time Segmentation group is cleared and the Enable check box is selected.Controls whether to pre-pad (prefix) the time signal with an appropriate number of zeros equal to the first time sample value divided by the time step. If the software detects non-zero time delay, any FFT is prefixed by default. You can clear the Enable Pre-Padding check box to override the default behavior. When you clear the check box, the software moves the initial time step of the signal to 0 to perform the FFT.Note: Pre-padding can coexist with zero-padding (post-padding). When you request an enforced frequency resolution, the appropriate number of post-zero-pads take into account any existing pre-zero-pads.When you request Signal Repetition, the software applies pre-padding only to the repeated signal as a whole. It does not apply it to each instance of the signal individually.When you set a non-zero lower limit in the Input Range Selection group, the software does not prefix your specified limit (altered time delay).
Fourier Transform Output Post-processing
Lets you edit the frequency axis of the FFT results to limit the output of the results.
Lower Limit	Lets you specify the lower frequency limit to use for visualizing the result.For more information, see Additional magnitude options.
Upper Limit	Lets you specify the upper frequency limit to use for visualizing the result.For more information, see Additional magnitude options.
Average Spectra after Segmentation
Enable	Averages specified measurements to reduce random noise or reduce signal fluctuations.
Averaging Type	Available when the Enable check box is selected.Specifies the type of averaging to use.**Amplitude-Phase (Linear)**Computes the final values as an average of the data values present in the time signal.Use this option to reduce random noise.**Real-Imaginary (Linear)**Computes the final values as an average of the data values present in the time signal.Use this option to reduce random noise.**Maximum (Peak-Hold)**Keeps the root mean square peak levels of the averaged data values present in the time signal. Use this option to get the maximum frequency peaks for a transient time history, such as an engine in run-up conditions.**RMS (Energy)**Computes the final values as an average of energy or power of the data values present in the time signal.Use this option to reduce signal fluctuations but not the random noise.
Info	Opens an information window that:Lists for each data set the following quantities for the time and frequency domains: minimum, maximum, step, and block size.Warns about any values that exceed thresholds.

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Transforming time-domain to frequency

Processing Motion results for use in a vibro-acoustic response

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Time Signal Processing dialog box, Simcenter 3D 2021.1 Series

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