Application of the Wave Based Method for the Steady-state Acoustic Response Prediction of a Car Cavity in the Mid-frequency Range

The paper discusses the application of the Wave Based Method (WBM) for the steady-state acoustic response prediction of a car cavity up towards the mid-frequency range. After explaining the need for new prediction tools, the mathematical background of the WBM is given. The prediction results are compared with the results obtained by the Finite Element Method (FEM). For validation purposes, both a simple analytical benchmark problem is considered as well as the 3-dimensional problem of the Sound Brick, which is a test setup especially developed for validation experiments. It is demonstrated that the WBM is computationally more efficient than the FEM in both cases so that the practical frequency limitation for the WBM is much higher than for the FEM.