NLOAD1

Bulk Data Entry Defines a time-dependent load or enforced motion for use in explicit dynamic analysis.

(1)
f(t)=A⋅C⋅F(t/B) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOzaiaacI cacaWG0bGaaiykaiabg2da9iaadgeacqGHflY1caWGdbGaeyyXICTa amOraiaacIcacaWG0bGaai4laiaadkeacaGGPaaaaa@44F2@

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
NLOAD1 SID EXCITEID SENSID TYPE TID B C CID  
  T TEND              

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
NLOAD1 5 7   LOAD 13        

Definitions

Field Contents SI Unit Example
SID Load set identification number.

(Integer > 0)

  
EXCITEID SID number of DAREA, SPCD, GRAV or static load set data entry that defines A. 2 3 5

(Integer > 0)

  
SENSID Sensor identification number. Load application is activated once the referenced sensor is activated.

(Integer > 0)

  
TYPE Defines the dynamic excitation type. 2 3

Default = 0 (Integer, character or blank)

  
TID TABLEDi entry identification number defining the load history F(t).

(Integer > 0)

  
B Scale factor of the time in f(t).

Default = 1.0 (Real > 0)

  
C Scale factor for the function value in f(t).

Default = 1.0 (Real)

  
CID Coordinate system identification number defining a frame in which the imposed velocity is defined. Applies only for TYPE = 2, V, VE, VEL, or VELO. Only CORD1R and CORD2R systems are allowed.

(Integer > 0 or blank)

  
T Start time. 4

Default = 0.0 (Real ≥ 0.0)

  
TEND End time.

Default = 1030 (Real > T)

  

Comments

  1. Time-dependent load sets must be selected with the Subcase Information command NLOAD = SID. It can only be selected in Explicit Dynamic Analysis subcases which are defined by an ANALYSIS = EXPDYN Subcase Informaton Entry.
  2. The type of the dynamic excitation is specified by TYPE according to:
    TYPE
    TYPE of Dynamic Excitation
    0, L, LO, LOA, or LOAD
    Applied load (force, moment, pressure, GRAV).
    (Default)
    1, D, DI, DIS, or DISP
    Enforced displacement using SPC/SPCD data.
    2, V, VE, VEL, or VELO
    Enforced velocity using SPC/SPCD data.
    3, A, AC, ACC, or ACCE
    Enforced acceleration using SPC/SPCD data.
  3. The TYPE also determines the manner in which EXCITEID is used by the program as:
    • Excitation specified by TYPE is applied load. The EXCITEID may reference DAREA, or (and) static load set entries. If EXCITEID references both DAREA and static load set, the two loads will be super-imposed.
    • Excitation specified by TYPE is enforced motion. The EXCITEID must reference SPCD entries.
  4. T and TEND are only considered for enforced displacement, velocity, and acceleration. The continuation line is optional.
  5. If a GRAV Bulk Data Entry is referenced in the EXCITEID field, the TYPE field should be set to LOAD.
  6. This card is represented as a load collector in HyperMesh.