PREDICTION OF FLEXURAL WAVE TRANSMISSION USING ADVANCED SEA FOR THREE COUPLED PLATES INCORPORATING A PERIODIC RIBBED PLATE

This paper considers the transmission of flexural waves across systems of coupled plates formed from a periodic ribbed plate and homogeneous isotropic plates. Previous work by the authors has shown that compared to classical SEA, Advanced SEA (ASEA) can significantly improve the accuracy of predictions of vibration transmission for an L-junction comprising a homogeneous isotropic plate and a periodic ribbed plate. The main reason for this is that ASEA can effectively account for coupling between physically unconnected subsystems due to tunneling mechanisms. This paper extends the validation of ASEA to larger plate structures by incorporating a third plate (homogeneous, isotropic plate) to form an in-line periodic structure as well as three plates connected to form a corner that effectively introduces flanking transmission. ASEA results are compared with numerical models using Finite Element Method (FEM) and classical SEA using coupling loss factors from wave theory. In both cases, ASEA shows significant improvements to SEA for high-frequency vibration transmission in plate structures.