“…Furthermore, the use of crosses makes a more effective excitation of the rotational DOFs possible, enabling us to obtain a reliable six DOF characterization of these substructures and, hence a twelve DOF characterization of assemblies A and B. A similar testing campaign and procedure to compute the interface accelerations and loads was reported in [28] and [18]. Indeed, the eigenfrequency of the first flexible mode is 5187 Hz for the aluminum cross and 5950 Hz for the steel cross.…”