Interpolation Constraint Element
Description: Defines the motion at a reference grid point as the weighted average of the motions at a set of other grid points.
Format:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| RBE3 | EID | REFGRID | REFC | WT | G1 | G2 | |||
| G3 | G4 | ... | |||||||
Example:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| RBE3 | EID | REFGRID | REFC | WT | G1 | G2 | |||
| G3 | G4 | ... | |||||||
| Field | Definition | Type | Default |
|---|---|---|---|
| EID | Element identification number. | Integer > 0 | Required |
| REFGRID | Reference grid point identification number. | Integer > 0 | Required |
| REFC | Component numbers at the reference grid point. (Up to six unique digits may be placed in the field with no embedded blanks.) | 1 ≤ Integers ≤ 6 | Required |
| WT | Weighting factor for components of motion at grid points Gi. | Real | Required |
| Gi | Grid points have weighting factor WT in the averaging equations. | Integer > 0 | Required |
Remarks:
- Components REFC at grid points Gi must be able to react rigid body motion resulting from REFC.
- Blank spaces may be left at the end of a Gi sequence.
- By default, a dependent degree of freedom assigned by one element cannot be assigned dependent by another rigid element and cannot be additionally constrained (e.g., single-point constraint).
- Degrees of freedom declared to be independent by one rigid body element can be made dependent by another rigid body element or by a multipoint constraint.
- Rigid elements, unlike MPCs, are not selected through the Case Control Section.