The Added Mass node adds the equations for the inertial effects of components that are not explicitly modeled in the rotor system. It is assumed that these components are mounted on the rotor and therefore rotate with it. Inertial properties in the
Added Mass node are thus assumed to be specified in the rotating frame. Also, the flexibility of these components is much smaller than that in the rotor. Therefore, these components can be treated as rigid bodies. Added mass can exist on domains and boundaries. The inertia force in Solid Rotor due to added mass in the corotating frame can, by using
Equation 3-4, be written as
where M is the mass distribution matrix. For added mass on a boundary, the contribution to the virtual work is
