TLOAD1

Transient Response Dynamic Load, Form 1

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

for use in transient response analysis.

Format:

Example:

Field	Definition	Type	Default
SID	Set identification number.	Integer > 0	Required
EXCITEID	DAREA or SPCD entry set identification number that defines A.	Integer > 0	Required
DELAY	DELAY set identification number that defines .	Integer > 0 or blank
TYPE	Defines the nature of the dynamic excitation. See Remark 2.	0 ≤ Integer ≤ 3 or character	0
TID	TABLEDi set identification number that defines F(t).	Integer > 0	Required

Remarks:

1. Dynamic load sets must be selected with the Case Control command DLOAD = SID.
2. The nature of the dynamic excitation is defined in the following table:

   TYPE	Type of Dynamic Excitation
   0, L, or LOAD	Applied load (force or moment) (default)
   1, D, or DISP	Enforced displacement using large mass or SPCD
   2, V, or VELO	Enforced velocity using large mass or SPCD
   3, A, or ACCE	Enforced acceleration using large mass or SPCD

3. The TYPE field determines the manner in which the EXCITEID field is used as described below:
   • Excitation specified by TYPE is an applied load
     • If there is no LOADSET request in the Case Control, then EXCITEID may directly reference DAREA, static, and thermal load set entries.
     • If there is a LOADSET request in the Case Control, then the model will reference static and thermal load set entries specified by the LID or TID field in the selected LSEQ entries corresponding to the EXCITEID.
   • Excitation specified by TYPE is an enforced motion
     • If there is no LOADSET request in the Case Control, then EXCITEID will reference SPCD entries. If these entries indicate null enforced motion, Autodesk Nastran will then assume that the excitation is enforced motion using large mass and will reference DAREA and static and thermal load set entries just as in the case of applied load excitation.
     • If there is a LOADSET request in Case Control, then the model will reference SPCD entries specified by the LID field in the selected LSEQ entries corresponding to the EXCITEID. If these entries indicate null enforced motion, Autodesk Nastran will then assume that the excitation is enforced motion using large mass and will reference static and thermal load set entries corresponding to the DAREA entry in the selected LSEQ entries, just as in the case of applied load excitation.
4. EXCITEID may reference sets containing QHBDY, QBDYi, and QVOL entries in heat transfer analysis.
5. If DELAY is blank or zero, will be set to zero.