Frequency List, Alternate Form 1
Description: Defines a set of frequencies to be used in the solution of frequency response problems by specification of a starting frequency, frequency increment, and the number of increments desired.
Format:
Example:
| Field | Definition | Type | Default |
|---|---|---|---|
| SID | Set identification number. | Integer > 0 | Required |
| F1 | First frequency in set. | Real ≥ 0.0 | Required |
| DF | Frequency increment. | Real ≥ 0.0 | Required |
| NDF | Number of frequency increments. | Integer > 0 | Required |
Remarks:
- FREQi entries must be selected with the Case Control command FREQUENCY = SID.
- The units for F1 and DF are cycles per unit time.
- The frequencies defined by this entry are given by:
- The DFREQ model parameter specifies the threshold for the elimination of duplicate frequencies. Duplicate frequencies will be ignored if
where DFREQ is defaulted to 1.0x10-5 and
and
are the maximum and minimum solution frequencies of the combined FREQi entries. (See Section 5,
Parameters, for more information on
DFREQ.)