FREQ1

Bulk Data Entry

FREQ1 – 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

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

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

Field	Contents
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. 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.