Parametric approaches for uncertainty propagation in SEA

A limit of statistical energy analysis (SEA) is that of providing only the mean values of the mechanical energy of a vibrating system. In this paper, the variability of SEA solution under uncertain SEA parameters (coupling loss factors, internal loss factors and injected powers) is investigated by comparing a sensitivity approach and a design of experiment (DoE) approach. Uncertainties of the SEA parameters depend on uncertainties in the physical properties of the considered mechanical system. Numerical results are derived using a benchmark structure made by three aluminum plates with a common junction and a launcher fairing. The analysis of the effect of uncertainties of SEA parameters can be used for design purposes, i.e. to identify which are the most effective areas to modify in order to control the energy level of a given subsystem.