Bulk Data Entry Defines a time-dependent dynamic excitation or enforced motion.

## Description

Defines a time-dependent dynamic excitation or enforced motion of the form:(1)
$\mathbf{f}\left(t\right)=\left\{\begin{array}{lll}0\hfill & \text{for}\hfill & t<\left({T}_{1}+\tau \right) \text{or} t>\left({T}_{2}+\tau \right)\hfill \\ A{\stackrel{˜}{t}}^{B}{e}^{C\stackrel{¨}{t}} \text{cos}\left(2\pi \overline{f}\stackrel{˜}{t}+\varphi \right)\hfill & \text{for}\hfill & \left({T}_{1}+\tau \right)\le t\le \left({T}_{2}+\tau \right)\hfill \end{array}$

For use in a transient response analysis and transient heat transfer analysis, where $\stackrel{˜}{t}=t-{T}_{1}-\tau$ and ${T}_{2}>{T}_{1}$ . It can also be used to specify the user-defined static loading curve for Nonlinear Static Analysis.

Where,

$f\left(t\right)$ is the time-dependent dynamic load or enforced motion, multiplier for transient heat transfer convection coefficient or user-defined loading curve.

$A$ defines the amplitude of the dynamic excitation in transient response analysis, or base-load in Nonlinear Static Analysis and is referenced by the EXCITEID field.

$\tau$ is the time delay defined in the DELAY field.

${T}_{1}$ and ${T}_{2}$ are time constants defined in the T1 and T2 fields.

B, C, $f$ and $\phi$ are the growth coefficient, exponential coefficient, frequency and phase angle respectively and are defined in the corresponding B, C, F and P fields.

## Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
TLOAD2 SID EXCITEID DELAY TYPE T1 T2 F P
C B
"EXTN" TSTIME

## Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
TLOAD2 4 10     2.1 4.7 12.0
2.0

## Definitions

Field Contents SI Unit Example
SID Set identification number.

(Integer > 0)

EXCITEID Identification number of the DAREA, SPCD, FORCEx, MOMENTx, PLOADx, PLOADSF, PRSPENE, RFORCE, QVOL, QBDY1, ACCEL, ACCEL1, ACCEL2, GRAV, TEMP, or TEMPD entry set that defines $A$ . 2 3

When TYPE = 5, J, JO, JOU, or JOUL, this entry refers to the subcase identification number of a steady-state electrical analysis (SSEC).

(Integer > 0)

DELAY Defines time delay $\tau$ . If it is a non-zero integer, it represents the identification number of DELAY Bulk Data Entry that defines $\tau$ . If it is real, then it directly defines the value of $\tau$ that will be used for all degrees-of-freedom that are excited by this dynamic load entry.

If blank or zero, $\tau$ will be zero.

(Integer ≥ 0, real or blank

TYPE Defines the type of the dynamic excitation. 2 3

Default = 0 (Integer, character or blank)

T1 Time constant.

(Real ≥ 0.0)

T2 Time constant.

(Real; T2 > T1)

F Frequency in cycles per unit time.

Default = 0.0 (Real ≥ 0.0)

P Phase angle in degrees.

Default = 0.0 (Real)

C Exponential coefficient.

Default = 0.0 (Real)

B Growth coefficient.

Default = 0.0 (Real)

"EXTN" Extended options indicator.
TSTIME String to indicate Total/Subcase time switch. Only supported for Nonlinear subcases. 10
TOT or 0
Uses total time to look up table data for current TLOAD2.
SUB or 1
Uses subcase time to look up table data for current TLOAD2.
blank

Default = TOT

1. Dynamic excitation sets must be selected with the Subcase Information command with DLOAD=SID.
2. The type of dynamic excitation is specified by TYPE (field 5) based on the following table:
TYPE TYPE of Dynamic Excitation
Integer Character
0 L, LO, LOA, or LOAD Applied load (force, moment or pressure).

(Default)

1 D, DI, DIS, or DISP Enforced displacement or temperature; EXCITEID references SPC/SPCD data.
2 V, VE, VEL, or VELO Enforced velocity; EXCITEID references SPC/SPCD data.
3 A, AC, ACC, or ACCE Enforced acceleration; EXCITEID references SPC/SPCD data.
4 T, TE, TEM, or TEMP Enforced temperature; EXCITEID references TEMP/TEMPD data.
5 J, JO, JOU, or JOUL Enforced Joule loss density; EXCITEID references ID of a steady-state electrical subcase, from which the Joule loss density will be applied in the transient heat transfer subcase.
3. The TYPE also determines the manner in which EXCITEID is used by the program as described below.
• If the type of dynamic excitation specified by TYPE is applied load, the EXCITEID must reference DAREA, FORCEx, MOMENTx, PLOADx, PLOADSF, PRSPENE, RFORCE, GRAV, QVOL, ACCEL, ACCEL1, ACCEL2 or QBDY1 entries.
• If the type of dynamic excitation specified by TYPE is enforced motion (TYPE=1, 2, or 3), the EXCITEID must reference SPC/SPCD entries.
• If the excitation specified by TYPE is enforced temperature (TYPE=4), the EXCITEID must reference TEMP/TEMPD entries.
• TYPE=1 must be specified if the EXCITEID field references SPCD data used in transient heat transfer analysis to define time-dependent thermal boundary conditions. This also applies when using SPCD to identify a time-dependent heat transfer convection coefficient.