Rotational Force
Description: Defines static loading resulting from angular velocity and/or acceleration.
Format:
Example:
| Field | Definition | Type | Default |
|---|---|---|---|
| SID | Load set identification number. | Integer > 0 | Required |
| G | Grid point identification number. | Integer ≥ 0 or blank | 0 |
| CID | Coordinate system identification number. | Integer ≥ 0 or blank | 0 |
| A | Scale factor of the angular velocity in revolutions per unit time. | Real | Required |
| R1, R2, R3 | Rectangular component of rotation vector
 . The vector defined will pass through point G.
|
Real | Required; must have at least one nonzero component |
| RACC | Scale factor of the angular acceleration in revolutions per unit time squared. | Real | 0.0 |
Remarks:
- The force vector at grid point Gi in Figure 1, is given by:
where,
angular velocity is given by
(radians/unit time)
angular acceleration is given by
(radians/unit time squared)
is the translational mass matrix at grid point Gi
Figure 1. RFORCE Vector at Grid Point Gi
- Load sets must be selected in the Case Control Section (LOAD = SID).
- G = 0 indicates that the rotation vector acts through the origin of the basic coordinate system.
- A CID of zero references the basic coordinate system.
- The continuation entry is optional.