To define a frequency curve:
- In the PropertyManager of a load or base excitation in a harmonic or random vibration study, under Variation with frequency, do one of the following:
- Click Linear to use the default linear curve of load versus frequency. If you select this option, go directly to step 7.
- Click Curve to specify your own variation of load versus frequency. If you select this option, continue with the next step.
- Click Edit.
The Frequency Curve dialog box opens.
- In the Curve information box, type a name for the curve.
- Set the Units for the X (rad/sec or Hz) column. The Y values are dimensionless multipliers to the quantity specified in the PropertyManager for the associated load or base excitation.
- Edit the curve data as desired. To get the curve from an external file, click Get curve.
The Function Curves dialog box opens.
The X-Y columns show the default values based on the selected shape. You can edit the values in the cells as desired. To add a row, double-click in any cell in the Points column. To delete selected rows, right-click the selection and select Delete.
- To save the curve for subsequent use, click Save Curve, specify a name and a destination folder for the curve file and click Save.
The program adds the extension .cwcur to the filename. The specified curve can be used in other documents.
- Click OK.
You will return to the Load/restraint PropertyManager.
- To view the actual values of the specified load/restraint, under Variation with frequency, click View.
- Close the graph window.