Creo Simulate > Reference Links > Frequency Range
  
Frequency Range
Specify the minimum and maximum frequencies of excitation for the range over which you want Creo Simulate to report results for dynamic frequency and dynamic random analyses.
The minimum frequency must be greater than or equal to 0.
The default maximum frequency is Automatic, which is 1.5 times the highest natural frequency calculated.
If you select User-defined, you can type a value for the maximum frequency.
Return to Output Steps or To Select Output Options for a Dynamic Frequency Analysis or To Select Output Options for a Dynamic Random Analysis.