Reduced-Order Modeling of Turbine Bladed Discs by 1D Elements

The dynamic behavior of turbine bladed discs is deeply influenced by blades geometry, which is determined as a compromise between fluid-dynamic and mechanical needs. One of the most important issue from the mechanical side is the tailoring of the dynamic characteristics to allow a sufficient separation between the natural frequencies and the harmonics of the rotational speed. The most common approach to predict the natural frequencies of bladed discs involves the realization of 3D FE models using solid elements. This approach is highly demanding in terms of time for the realization of the models as well as for the computation, even when only one blade if explicitly modeled and a cyclic symmetry constraint is employed.