RLOAD1

Bulk Data Entry Defines a frequency-dependent dynamic load of the form: P( f )=A( C( f )+iD( f ) ) e i( θ−2πfτ ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaebbnrfifHhDYfgasaacH8srps0l bbf9q8WrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbba9q8WqFfea0=yr0R Yxir=Jbba9q8aq0=yq=He9q8qqQ8frFve9Fve9Ff0dmeaabaqaciGa caGaaeqabaqaaeaadaaakeaacaWGqbWaaeWaaeaacaWGMbaacaGLOa GaayzkaaGaeyypa0JaamyqamaabmaabaGaam4qamaabmaabaGaamOz aaGaayjkaiaawMcaaiabgUcaRiaadMgacaWGebWaaeWaaeaacaWGMb aacaGLOaGaayzkaaaacaGLOaGaayzkaaGaamyzamaaCaaaleqabaGa amyAamaabmaabaGaeqiUdeNaeyOeI0IaaGOmaiabec8aWjaadAgacq aHepaDaiaawIcacaGLPaaaaaaaaa@4BFB@ for use in frequency response problems.

RLOAD1 (Form 1) can be used when the frequency-dependent dynamic load input is available in real/imaginary number format.

Format

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

Example

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

Definitions

Field Contents SI Unit Example
SID Set identification number. Must be unique for all RLOAD1 and RLOAD2 entries.

No default (Integer > 0)
EXCITEID Identification number of the DAREA, SPCD, FORCEx, MOMENTx, PLOADx, RFORCE, ACCEL, ACCEL1, ACCEL2 or GRAV entry set that defines A.

No default (Integer > 0)
DELAY Defines time delay τ . If it is a non-zero integer, it represents the identification number of a DELAY Bulk Data Entry that defines τ . If it is Real, then it directly defines the value of τ that will be used for all degrees-of-freedom that are excited by this dynamic load entry.

Default = 0 (Integer ≥ 0, or Real)
DPHASE Defines phase θ in degrees. If it is a non-zero integer, it represents the identification number of a DPHASE Bulk Data Entry that defines θ . If it is Real, then it directly defines the value of θ that will be used for all degrees-of-freedom that are excited by this dynamic load entry.

Default = 0 (Integer ≥ 0, or Real)
TC
Integer ≥ 0
Set identification number of the TABLED1, TABLED2, TABLED3, TABLED4 or TABLEG entry that gives C ( f ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaebbnrfifHhDYfgasaacH8srps0l bbf9q8WrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbba9q8WqFfea0=yr0R Yxir=Jbba9q8aq0=yq=He9q8qqQ8frFve9Fve9Ff0dmeaabaqaciGa caGaaeqabaqaaeaadaaakeaacaWGdbWaaeWaaeaacaWGMbaacaGLOa Gaayzkaaaaaa@34F6@ .
Real
This real value is used for C ( f ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaebbnrfifHhDYfgasaacH8srps0l bbf9q8WrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbba9q8WqFfea0=yr0R Yxir=Jbba9q8aq0=yq=He9q8qqQ8frFve9Fve9Ff0dmeaabaqaciGa caGaaeqabaqaaeaadaaakeaacaWGdbWaaeWaaeaacaWGMbaacaGLOa Gaayzkaaaaaa@34F6@ for all frequencies.2
Blank

Default = 0 if TD is non-zero.
TD
Integer ≥ 0
Set identification number of the TABLED1, TABLED2, TABLED3, TABLED4 or TABLEG entry that gives D ( f ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaebbnrfifHhDYfgasaacH8srps0l bbf9q8WrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbba9q8WqFfea0=yr0R Yxir=Jbba9q8aq0=yq=He9q8qqQ8frFve9Fve9Ff0dmeaabaqaciGa caGaaeqabaqaaeaadaaakeaacaWGebWaaeWaaeaacaWGMbaacaGLOa Gaayzkaaaaaa@34F7@ .
Real
This real value is used for D ( f ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaebbnrfifHhDYfgasaacH8srps0l bbf9q8WrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbba9q8WqFfea0=yr0R Yxir=Jbba9q8aq0=yq=He9q8qqQ8frFve9Fve9Ff0dmeaabaqaciGa caGaaeqabaqaaeaadaaakeaacaWGebWaaeWaaeaacaWGMbaacaGLOa Gaayzkaaaaaa@34F7@ for all frequencies. 2
Blank

Default = 0 if TC is non-zero.
TYPE Identifies the type of the dynamic excitation.

Default = 0 (See Comment 4)

Comments

  1. Dynamic load sets must be selected in the I/O Options or Subcase Information sections with the command DLOAD=SID.
  2. If any DELAY, DPHASE, TC, or TD fields are blank or zero, the corresponding τ , θ , C ( f ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaebbnrfifHhDYfgasaacH8srps0l bbf9q8WrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbba9q8WqFfea0=yr0R Yxir=Jbba9q8aq0=yq=He9q8qqQ8frFve9Fve9Ff0dmeaabaqaciGa caGaaeqabaqaaeaadaaakeaacaWGdbWaaeWaaeaacaWGMbaacaGLOa Gaayzkaaaaaa@34F6@ , or D ( f ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaebbnrfifHhDYfgasaacH8srps0l bbf9q8WrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbba9q8WqFfea0=yr0R Yxir=Jbba9q8aq0=yq=He9q8qqQ8frFve9Fve9Ff0dmeaabaqaciGa caGaaeqabaqaaeaadaaakeaacaWGebWaaeWaaeaacaWGMbaacaGLOa Gaayzkaaaaaa@34F7@ will be zero. Either TC or TD may be blank or zero, but not both.
  3. 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.
  4. Valid entries for the TYPE field are listed alongside a description of the dynamic excitation which 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.
  5. 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.
  6. All static structural loads can be referenced by EXCITEID by referring to the SID on the structural load. The structural loads are FORCE, FORCE1, FORCE2, MOMENT, MOMENT1, MOMENT2, PLOAD, PLOAD1, PLOAD2, PLOAD4, RFORCE, ACCEL, ACCEL1, ACCEL2 and GRAV. EXCITEID cannot reference the LOAD and LOADADD Bulk Data Entries.
  7. This card is represented as a load collector in HyperMesh.