Frequency Response Dynamic Load, Form 2
Description: Defines a frequency-dependent dynamic load of the form
for use in frequency response problems.
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 | |
| DPHASE | DPHASE set identification number that defines
 .
|
Integer > 0 or blank | |
| TB | TABLEDi set identification number that defines B(f). | Integer > 0 or blank | |
| TP | TABLEDi set identification number that defines ϕ(f). | Integer > 0 or blank | |
| TYPE | Defines the nature of the dynamic excitation. See Remark 2. | 0 ≤ Integer ≤ 3 or character | 0 |
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 2, V, or VELO Enforced velocity using SPCD 3, A, or ACCE Enforced acceleration using SPCD - 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 there is a LOADSET request in the Case Control, then the model will reference SPCD entries specified by the LID field in the selected LSEQ entries corresponding to the EXCITEID.
- Excitation specified by TYPE is an applied load
- If any of DELAY, DPHASE, or TP fields are blank, the corresponding
,
,
ϕ(f) will be zero.