TLOAD1

Bulk Data Entry

TLOAD1 – Transient Response Dynamic Excitation or Nonlinear Static Loading Curve, Form 1

Description

Defines a time-dependent dynamic load or enforced motion of the form:

for use in transient response analysis. It can also be used to specify the user-defined static loading curve for Nonlinear Static Analysis

Where,

is the time-dependent dynamic load or enforced motion, 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.

is a user-defined function that defines the time-variant nature or loading scale factors for . It is specified by referencing a predefined TABLEDi entry in the TID field.

is the time delay defined in the DELAY field.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
TLOAD1	SID	EXCITEID	DELAY	TYPE	TID

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
TLOAD1	5	7		LOAD	13

Field	Contents
SID	Set identification number. (Integer > 0)
EXCITEID	Identification number of the DAREA, SPCD, FORCEx, MOMENTx, PLOADx, RFORCE, QVOL, QBDY1, ACCEL, ACCEL1, ACCEL2, or GRAV entry set that defines {A}. See comments 2 and 3. (Integer > 0)
DELAY	Defines time delay . If it is a non-zero integer, it represents the identification number of DELAY bulk data entry that defines . If it is real, then it directly defines the value of that will be used for all degrees-of-freedom that are excited by this dynamic load entry. If blank or zero, will be zero. (Integer > 0, real or blank)
TYPE	Defines the type of the dynamic excitation. See comments 2 and 3. Default = 0 (Integer, character or blank)
TID	TABLEDi entry identification number that gives . (Integer > 0)

Comments

1.	Dynamic excitation sets must be selected with the subcase information command DLOAD=SID.

2.	The type of dynamic excitation is specified by TYPE based on the following table:

TYPE		TYPE of Dynamic Excitation
Integer	Character	TYPE of Dynamic Excitation
0	L, LO, LOA, or LOAD	Applied load (force or moment) (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.

3.	The TYPE also determines the manner in which EXCITEID is used by the program as described below.

Excitation specified by TYPE is applied load. The EXCITEID must reference DAREA, FORCEx, MOMENTx, PLOAD, RFORCE, GRAV, QVOL, ACCEL, ACCEL1, ACCEL2 or QBDY1 entries.

Excitation specified by TYPE is enforced motion. The EXCITEID must reference SPC/SPCD 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.

4.	TLOAD1 loads may be combined with TLOAD2 loads only by specification on a DLOAD entry. That is, the SID on a TLOAD1 entry may not be the same as that on a TLOAD2 entry.

5.	SID must be unique for all TLOAD1, TLOAD2, RLOAD1, and RLOAD2 entries.

6.	If TLOAD1 entries are selected for Fourier analysis, then the time-dependent loads on the TLOAD1 entries are transformed to the frequency domain. Then the analysis is performed as a frequency response analysis, but the solution and the output are converted to and printed in the time domain.

7.	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. EXCITEID cannot reference the LOAD and LOADADD bulk data entries.

The DT and TTERM fields on the NLPARM Bulk Data Entry allow for an alternate method (instead of NINC) to define the loading curve for Nonlinear Static Analysis. The DLOAD Subcase Entry can be used in a NLSTAT subcase to reference TLOAD1 Bulk Data Entry. This allows for the specification of a user-defined loading curve via the TID field on the TLOAD1 entry. The TID field references the Time (X) vs Load Scale Factors (Y) that scales the loading specified on the EXCITEID field.

9.	This card is represented as a loadcollector in HyperMesh.