Analysis of the short and long wavelength coupling through original and scaled models

The coupling between long and short structural wavelengths is here investigated by using two different modelling techniques. The first is based on standard Finite Element Approach and used as a reference, while the second is built by scaling only the FEA model of the component carrying the shorter waves. The physical domain belonging to this one was scaled while the related original damping loss factor was artificially increased to recover the original energy content. This procedure is known as ASMA, Asymptotical Scaled Modal Analysis and it was defined for reducing the computational effort needed for the simulation of a given structural problem at increasing values of the modal overlap factors. Here, two configurations taken from the specific literature were investigated: the structural dynamic response of two in-line rods and a beam coupled with a plate. The present simulation results highlight the limits and the advantages of ASMA in analysing this specific coupling. This work is aimed to the definition of a hybrid approach between deterministic and energy methods.