RFORCE

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:

1. 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

2. Load sets must be selected in the Case Control Section (LOAD = SID).
3. G = 0 indicates that the rotation vector acts through the origin of the basic coordinate system.
4. A CID of zero references the basic coordinate system.
5. The continuation entry is optional.