APPLICATION OF SEA AND ADVANCED SEA TO STRUCTURE -BORNE SOUND TRANSMISSION ON A RECTANGULAR BEAM FRAMEWORK

This paper concerns the prediction of vibration tra nsmission across networks of coupled beams using a bending wave only model and a bending and longitudinal wave model. Statistical Energy Analysis (SEA) is used with coupling l oss factors determined from wave theory and is compared with numerical experiments from Finite Element Methods (FEM) for simple beam junctions as well as a rectangular beam framework. The results show that SEA can accurately predict vibration transmission across an i solated L-junction of beams. However, for the rectangular beam framework there is only good a greement between SEA and FEM for beams that are physically connected. Discrepancies occur at mid- and high-frequencies for beams that are not physically connected to the sour ce beam with SEA overestimating the vibration levels for distant beam subsystems. However , Advanced SEA (ASEA) is shown to provide good agreement with FEM because it is able to account for propagation losses within a framework that includes unavailable modal energy.