Create a random event

1. In the Simulation Navigator, right-click the dynamic simulation node and choose Create Random Event.The Random Event dialog box is displayed.

2. On the Analysis Parameters tab, under PSD, Peak Evaluation, in the Lower Bound [Hz] box, enter the positive non-zero frequency value for the lower bound.

3. In the Upper Bound [Hz] box, enter the frequency value for the upper bound.The software performs the integration between these 2 bounds, using all selected modes.

4. Under Confidence Level, specify confidence level settings in one of these ways.To specify the value for the confidence level directly:Under Method, click User-Defined.In the Confidence Level (%) box, enter the value for the confidence level as a percentage.To compute the confidence level from the number of standard deviations:Under Method, click From Number of Standard Deviations.In the Number of Standard Deviations box, enter the number of standard deviations.The software automatically displays the corresponding confidence level value in the Confidence Level (%) box. It assumes a Gaussian distribution in order to transform the number of standard deviations into a confidence level.The software uses this confidence level to establish peak values for selected results, some of which do not follow Gaussian distributions, for example, Tsai-Wu failure indices or homogeneous Von Mises stresses.

5. Under Displacement, Velocity, Acceleration, specify whether the displacement, velocity, and acceleration results include the base excitation motion (absolute) or not (relative).

6. On the Excitation PSD tab, under Excitation Coordinate System, specify the excitation coordinate system.By default, the excitation coordinate system is the Nastran Basic coordinate system, which is this software's absolute coordinate system.

7. Under Excitation Axis, specify the X, Y, or Z-axis that represents the base movement direction.

8. Under PSD Curve, click Use Function .The XY Function Manager dialog box is displayed.

9. Select an existing PSD function from the AFU file list or create a new one.The function type must be power spectral density, and the ordinate type must be acceleration. Functions can be even or uneven. Because the software decides at which frequency points the evaluation is performed, independently of the function type, no user input is required.

10. Click OK.

11. On the Output Requests tab, select an existing Laminate Random Output Requests modeling object or click Create to create a new one.

12. Click OK.

How do I

Laminate Dynamics workflow

Create a dynamic simulation

Filter modes with small modal effective mass

Modify normal mode settings

Create a sine event

Solve the dynamic simulation

Learn more

Simcenter 3D Laminate Dynamics

Random Event

Sine Event

Look up more details

Simulation Navigator for Dynamic Simulation

Right-click commands for Dynamic Simulation

Laminate random results

Laminate sine results

Laminate Dynamics Details View subpanel (Simulation Navigator)

Supported elements

Damping definition

Modal truncation effects

Dynamic simulation output files

Confidence level in peak results computation

Supported failure theories

Running a Laminate Dynamics solution process from a command line

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

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Create a random event, Simcenter 3D 2021.1 Series

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