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

  1. FREQ1 entries must be selected with the I/O Options or Subcase Information command FREQUENCY = SID.
  2. The units for F1 and DF are cycles per unit time.
  3. The frequencies defined by this entry are given by fi = F1 + DF * (i -1)

    where i = 1 to (NDF + 1).

  4. 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:(1)
    | 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
  5. This card is represented as a load collector in HyperMesh.