Propeller modeling
Torsional rotor dynamics - Distribution of inertia and stiffness

Because of the type of modeling we've chosen, we can't take any blade vibrations into account. The propeller is therefore assumed to be dimensionally stable.

The inertia of a propeller is represented by an inertia disk I_h. It takes into account the inertia of the material making up the propeller plus 25% in the case of a marine propeller, to account for water displacement.

The propeller is discretized into a succession of d m elements whose mass is located at a constant distance r from the axis of rotation (figure 42). The elementary inertia of each element is therefore r²dm. The inertia of the propeller is calculated by summing the...