STRUCTURE-BORNE SOUND TRANSMISSION ACROSS PERIODIC BOX-LIKE STRUCTURES AFFECTED BY SPATIAL FILTERING

Repeating box-like structures formed from many connected plates can be found in many engineering structures such as buildings or ships. This paper concerns bending wave transmission across such structures in the audio-frequency range. Using an idealised building as an example, ray tracing is used to demonstrate that the angular distribution of power incident on the plate junctions differs significantly from the diffuse field assumption that is commonly made in SEA. Therefore to tackle the prediction of bending wave transmission, computationally efficient ray tracing has been developed for inclusion in Advanced SEA (ASEA) models to account for the spatial filtering that occurs across successive junctions of coupled plates. Comparison of ASEA with finite element models shows that ASEA can give significant improvements over SEA when there are large numbers of structural junctions between the source and receiver plates.