Transmission loss modelling plays a vital role in the design of acoustically efficient products. Whether in the aircraft, automotive or train industry, transmission loss measurements and simulation are used to improve the vibro-acoustic performance of components. Since fewer prototypes are built and therefore fewer tests can be made, the accurate prediction of transmission loss over the full frequency range of interest has become increasingly important. Modelling transmission loss of a complex structure involves the use of deterministic methods such as FEM (Finite Element Method) and BEM (Boundary Element Method) at lower frequencies and statistical methods such as SEA (Statistical Energy Analysis) at higher frequencies. Recently, a theoretical breakthrough in vibroacoustics provided the ability to rigorously couple FEM and SEA in a single model. This paper introduces the theoretical foundation of the “FE/SEA coupled” approach and compares transmission loss predictions with traditional methods (FEM, BEM, SEA) and with test. It also compares computation time and memory usage since “FE/SEA Coupled” reduces the DOFs of the linear system to be solved.
2009 – ICTCA, Dresden, Germany
Denis Blanchet (ESI Group, Germany)
Arnaud Caillet (ESI group, Germany)