You can apply a Response PSD Tool to any Random Vibration analysis (only) in order to control the frequency sampling of Response PSD probes.
Scoping and Result Types
When inserted, the Response PSD Tool automatically generates a Response PSD probe as its child object. You then properly scope both objects as desired.
Application
To define results using the Response PSD Tool:
Display the drop-down menu on the Solution Context tab and select or right-click the Solution object or in the Geometry window and select >>.
A Response PSD Tool object is placed under Solution object and includes a Response PSD probe. As needed, modify the following properties:
Include All Excitation Frequencies: Options include (default) and . Selecting includes all excitation frequencies in the sampling. The option includes minimum and maximum excitation frequencies in addition to the frequency samplings for natural frequencies.
Include User Defined Frequencies: Options include and (default). Selecting enables you to manually enter frequencies in the Tabular Data table (User Defined Frequency Steps).
Clustering Frequency Points: The minimum value for this property, and default, is
20. This property enables you to define the number of frequencies generated for both sides of the natural frequencies for response PSD result evaluations. If your response PSD curve contains a number of spikes, you can add more frequency points to obtain a more accurate RMS result, however: this increases evaluation time.
Properly scope the properties of the Response PSD probe.
Note: When a Response PSD probe is scoped to surface body, the application always reports the node result value using the smaller of the two values reported for the top and bottom layers.
For additional information, see the object reference page for the Response PSD Tool.