You can add the Gravity node to create the load caused by gravity. This gives load contribution from all the nodes in the physics interface that have density or mass, such as Linear Elastic Material, Added Mass, or Point Mass.

In the following, the mass density ρ should be considered to be generalized. It can represent mass per unit volume, mass per unit area, mass per unit length, or mass itself, depending on the dimensionality of the object giving the contribution. The gravity acts in a fixed spatial direction eg. The intensity in the corotating frame is:

where g is the acceleration of gravity. The action of gravity can also be presented as the linearly accelerated frame of reference. Thus, it can be accounted for as a contribution into the effective acceleration via the frame acceleration term given by:

Due to the presence of the transformation matrix R, which is time dependent, gravity in the Solid Rotor interface is only meaningful in a dynamic analysis. However, for a stationary analysis, the component of gravity that acts along the axis of the rotor is still considered, since it is independent of the rotation. For an eigenfrequency analysis, gravity has no effect. Since a gravity load in a corotating frame is a rotating load, it can be applied as described in Rotating Load in Frequency Domain for frequency-domain analyses.