FREQ1

Bulk Data Entry 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


(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
FREQ1	`SID`	`F1`	`DF`	`NDF`

Example


(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
FREQ1	6	2.9	0.5	13

Definitions


Field	Contents	SI Unit Example
`SID`	Set identification number. No default (Integer > 0)
`F1`	First frequency in set. No default (Real ≥ 0)
`DF`	Frequency increment. No default (Real > 0.0)
`NDF`	Number of frequency increments. Default = 1 (Integer > 0)

Comments

FREQ1 entries must be selected with the I/O Options or Subcase Information command FREQUENCY = SID.
The units for F1 and DF are cycles per unit time.
The frequencies defined by this entry are given by f_i = F1 + DF * (i -1)
where i = 1 to (NDF + 1).
All FREQi entries with the same set identification numbers will be used. Duplicate frequencies will be ignored. $f_{N}$ and $f_{N - 1}$ are considered duplicated if:
$| f_{N} - f_{N - 1} | < DFREQ * | f_{MAX} - f_{MIN} |$
Where,

DFREQ

User parameter with a default of 10^-5 * $f_{M A X}$

$f_{M I N}$

The maximum and minimum excitation frequencies of the combined FREQi entries
This card is represented as a load collector in HyperMesh.