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FREQ2 |
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FREQ2 |
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»Click here to display Table of Contents«
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FREQ2 |
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FREQ2 |
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Bulk Data Entry
FREQ2 – Frequency List, Alternate Form 2
Description
Defines a set of frequencies to be used in the solution of frequency response problems by specification of a starting frequency, final frequency, and the number of logarithmic increments desired.
Format
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
FREQ2 |
SID |
F1 |
F2 |
NF |
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Field |
Contents |
SID |
Set identification number. No default (Integer > 0) |
F1 |
First frequency in set. No default (Real > 0.0) |
F2 |
Last frequency in set. No default (Real > 0.0, F2 > F1) |
NF |
Number of logarithmic intervals. Default = 1 (Integer > 0) |
Comments
| 1. | FREQ2 entries must be selected with the I/O Options or Subcase Information command FREQUENCY = SID. |
| 2. | The units for F1 and F2 are cycles per unit time. |
| 3. | The frequencies defined by this entry are given by  |
where, 
and i = 1, 2, …, (NF + 1).
| 4. | 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: |
where, DFREQ is a user parameter with a default of 10-5 * fMAX , and fMIN are the maximum and minimum excitation frequencies of the combined FREQi entries.
| 5. | This card is represented as a loadcollector in HyperMesh. |
See Also:
