Description
The TLOAD1 entry defines a time-varying load or time varying kinematic boundary conditions of the following form:
P(t) = A*F(t – τ)
for use in transient response analysis. For example, in the above equation, if F represents a force at a point G, then P(t) represents the time history of the force at that grid point G.
Format
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| TLOAD1 | SID | EXCITEID | TYPE | TID |
Example
| TLOAD1 | 10 | 100 | 205 |
| Field | Definition | Type | Default |
|---|---|---|---|
| SID | Set identification number. | Integer > 0 | Required |
| EXCITEID | DAREA, SPCD, or SPCRD set identification number that defines A. | Integer > 0 | Required |
| 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
- Dynamic load sets must be selected with the Case Control command DLOAD = SID.
- 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 SPCD or SPCR 2, V, or VELO Enforced velocity using SPCD or SPCR 3, A, or ACCE Enforced acceleration using SPCD or SPCR - 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 load set entries.
- If there is a LOADSET request in the Case Control then the model will reference 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 and SPCRD entries. If these entries indicate null enforced motion, AUTODESK Explicit will then assume that the excitation is enforced motion will reference DAREA and 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 and SPCRD entries specified by the LID field in the selected LSEQ entries corresponding to the EXCITEID. If these entries indicate null enforced motion, AUTODESK Explicit will then assume that the excitation is enforced and will reference load set entries corresponding to the DAREA entry in the selected LSEQ entries, just as in the case of applied load excitation.
- Excitation specified by TYPE is an applied load