Converting frequency data to time domain

For digital signal processing, you can convert data with the Inverse FFT operation. This data processing operation performs an inverse Fast Fourier Transform (FFT) on any frequency-dependent data and converts it to time domain. The inverse FFT operation assumes that the provided frequency spectra is single sided and corrected with a scaling factor 2 / N, where N is the number of samples of the original time signal.

Additionally, the Inverse FFT dialog box lets you:

• Limit the input frequency spectrum and the resulting time signal.

• Specify a relative tolerance parameter that the software uses to test the equidistance of the frequency range.

Process overview

To invert and convert data with Model and Load Pre-processing:

1. Specify an input file that contains both load and mesh data or separate files that contain the data to process the external result data.

2. Run the data processing operation Inverse FFT to invert the frequency-dependent data and convert it to time domain.

3. (Optional) Run other various data processing operations.

4. Run the Model and Load Pre-processing pre-solver that writes out files in different formats, including an .sc_h5 file.

5. Visualize the results with a preconfigured post-processing view before you extract the loads stored in the .sc_h5 file and use them in another solution.

How do I

Define acoustic properties of fluids with CFD results

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Model and Load Pre-processing solution process

Solving the solution process

Remote solving workflow (Linux)

Steady state fluid velocity in an acoustic solution workflow

Transforming time-domain to frequency

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Model and Load Pre-processing in the Simulation Navigator

Files created during the solve

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Command reference

Pre/Post video examples

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Related Topics

Mean velocity flow mapping in an acoustic solution

Converting frequency data to time domain, Simcenter 3D 2021.1 Series

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