Uncertainty propagation in SEA using sensitivity analysis and Design of Experiments

A limit of Statistical Energy Analysis (SEA) is that of providing only the mean values of the mechanical energy of a vibrating system. In the proposed paper, the variability of SEA solution under uncertain SEA parameters (coupling loss factors and internal loss factors) 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 (Young modulus, material density, geometry, ...). Numerical results are derived using a benchmark structure made by three aluminum plates with a common junction.