Correlate two PSD excitations

After defining multiple PSD excitations in a random event, you can define relationships between pairs of them using the New Correlation dialog box.

1. Choose Response Dynamics tab→Response Dynamics group→Tools→Correlation Excitation .

2. In the New Correlation dialog box, in the From DOF list, select the first excitation to include in a correlated pair. The possible excitations with which you can define a correlation appear in the To DOF list. For example, if you have three excitations, and you select excitation 1 in the From DOF list, excitations 2 and 3 appear in the To DOF list.

3. In the To DOF list, select the excitation to correlate with the excitation you selected in step 1.Note: You can only define correlations between the same types of excitations. For example, you can define correlations between a distributed load and another distributed load, a nodal force and a nodal force, or an enforced motion and enforced motion.

4. Under Correlation Type, select the method (Phase Angle or Time Delay) with which to define the relationship. For example, if you have two random excitations to be applied 0.5 seconds apart, click Time Delay.If you chose Phase Angle, enter the phase angle by which to separate the two excitations in the Phase Angle(degree) box.If you chose Time Delay, enter the number of seconds by which to separate the two excitations in the Time Delay(seconds) box.

5. Click OK.

The software creates a CSD (cross-spectral density) excitation that includes the two correlated PSD functions. The CSD excitation appears in the Simulation Navigator under the Excitations node with the icon. You can select the excitation and see the two correlated functions in the Response Dynamics Details View.

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Correlate two PSD excitations, Simcenter 3D 2021.1 Series

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