FREQ
Bulk Data Entry Defines a set of frequencies to be used in the solution of frequency response problems.
Format
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| FREQ | SID | F1 | F2 | F3 | F4 | F5 | F6 | F7 | |
| F8 | etc | etc | etc | etc | etc | etc | etc |
Alternate Format
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| FREQ | SID | ||||||||
| F1 | |||||||||
| F2 | |||||||||
| F3 | |||||||||
| F4 | |||||||||
| etc |
Example
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| FREQ | 3 | 7.0 | 12.56 | 13.99 | 23.4 | 23.34 |
Example (Alternate Format)
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| FREQ | 3 | ||||||||
| 7.0 | |||||||||
| 12.56 | |||||||||
| 13.99 | |||||||||
| 23.4 |
Definitions
| Field | Contents | SI Unit Example |
|---|---|---|
| SID | Identification
number. No default (Integer > 0) |
|
| F# | Frequency value. The
units for F# are cycles per unit time. No default (Real ≥ 0.0) |
Comments
- FREQ entries must be selected with the I/O Options or Subcase Information command FREQUENCY = SID.
- All FREQi entries
with the same set identification numbers will be used. Duplicate frequencies
will be ignored.
fN
and
fN−1
are considered duplicated if: |fN−fN−1|<DFREQ*|fMAX−fMIN|Where,
- DFREQ
- User parameter with a default of 10-5 * fMAX
- fMIN
- The maximum and minimum excitation frequencies of the combined FREQi entries
- This card is represented as a load collector in HyperMesh.