A simplified energy method for acoustic sources identification

Abstract eng:
This paper deals with the behavior of acoustic cavities in the mid-high frequency range. An energy method called Simplified Energy Method (MES) has already been proposed to predict energy level in acoustic cavities. MES can also be applied to structures to determine energy densities. This paper proposes to use this energy method to solve inverse problems (structural and acoustics). Internal and boundary acoustic sources are detected thanks to the inverse formulation of the method (IMES). An example concerning a 3D acoustic cavity is proposed. The issue of determining the right input power is then discussed. MES is based on the superposition of direct and reverberated fields, and the lack of accuracy of the method comes from the bad evaluation of the directivity of the direct field. A mixed BEM / Energy method is proposed to improve the calculation of the direct field. This approach is called HMES (Hybrid Simplified Energy Method).

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