Application of the Wave Based Method for Mid-Frequency analysis on a Room Acoustics Case

This paper reports on the application of a recently developed deterministic prediction technique called the Wave Based Method (WBM) for the analysis of an interior room acoustics problem. The WBM has been developed as an alternative simulation technique for steady-state dynamic problems. It is based on a Trefftz approach in that exact solution functions of the governing differential equation are used as underlaying shape functions. Its superior convergence rate and lower computational load as compared to other deterministic methods such as the finite element method and the boundary element method, make it applicable also for mid-frequency analysis as has been reported already for various mechanical applications. In this paper, the WBM is applied for the acoustic analysis of an L-shaped room, and prediction results are compared with Fast Multipole BEM predictions, ray tracing results and measurements.