M. To calculate the structure frequency
To calculate the frequency of the structure for a load case, use the following procedure.
Frequency calculation is made for a specific load case, so you must have at least one primary load case added to the input file.
This can be done by either the Rayleigh method or the eigenvalue extraction method. The latter can consider missing mass mode.
Tip: This will add the load item to the currently selected load group selected in the program status bar.
- Select either:
- (Optional) For Modal Calculation, check the Consider Missing Mass option to include the missing mass procedure for steady state or harmonic analysis.
- Click Add. The frequency calculation is added to the load case.