RLOAD1

RLOAD1 – Frequency Response Dynamic Load, Form1

Defines a frequency-dependent dynamic load of the form $image\rload1new.gif$ for use in frequency response problems.

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
RLOAD1	SID	EXCITEID	DELAY	DPHASE	TC	TD	TYPE

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
RLOAD1	5	3			1

Field	Contents
SID	Set Identification number. No default (Integer > 0)
EXCITEID	Identification number of the DAREA or SPCD entry set that defines A. No default (Integer > 0)
DELAY	Identification number of the DELAY entry set that defines $image\tau.gif$ . Default = 0 (Integer > 0)
DPHASE	Identification number of the DPHASE entry set that defines $image\lowertheta.gif$ . Default = 0 (Integer > 0)
TC	Set identification number of the TABLED1, TABLED2, TABLED3 or TABLED4 entry that gives C( $image\hs.gif$ ). See comment 2 below. Default = 0 if TD is non-zero (Integer > 0)
TD	Set identification number of the TABLED1, TABLED2, TABLED3 or TABLED4 entry that gives D( $image\hs.gif$ ). See comment 2 below. Default = 0 if TC is non-zero (Integer > 0)
TYPE	Identifies the type of the dynamic excitation. Default = 0 (see comment 5)

Dynamic load sets must be selected in the I/O Options or Subcase Information sections with the command DLOAD = SID.
If any DELAY, DPHASE, TC, or TD fields are blank or zero, the corresponding $image\tau.gif$ , $image\lowertheta.gif$ , C( $image\hs.gif$ ), or D( $image\hs.gif$ ) will be zero. Either TC or TD may be blank or zero, but not both.
RLOAD1 loads may be combined with RLOAD2 loads only by specification on a DLOAD entry. This means that the SID on a RLOAD1 entry must not be the same as that on a RLOAD2 entry.
SID must be unique for all RLOAD1 and RLOAD2 entries.
The type field identifies the type of dynamic excitation. Valid entries for this field are listed alongside a description of the dynamic excitation with they invoke.

TYPE	Description
0, L, LO, LOA, LOAD	Applied load; EXCITEID references DAREA data.
1, D, DI, DIS, DISP	Enforced displacement; EXCITEID references SPCD data.
2, V, VE, VEL, VELO	Enforced velocity; EXCITEID references SPCD data.
3, A, AC, ACC, ACCE	Enforced acceleration; EXCITEID references SPCD data.

When EXCITEID refers to an SPCD entry, the modal space will be augmented with displacement vector(s) from linear static analysis with unit prescribed displacement at each of the SPCD degrees of freedom.

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