Abstract
In this project, an algorithm for the determination of the positions and the strengths of sound sources in closed combustion chambers by the evaluation of wall-flush-mounted microphones is presented. The theoretical background of the reconstruction of sound sources is the nearfield acoustic holography. In the theory of nearfield acoustic holography, evanescent modes of the sound pressure field have to be taken into consideration. The choice of these modes is described in detail. Since the problem is ill-conditioned, different regularization methods are used for the solution of the inverse acoustic problem. The algorithm is applied to optimize the arrangement of a sensor array with 48 microphones and the dependence on contaminating noise is investigated. The focus of this project is the localization of real sound sources not exactly located on the assumed source distribution. For this case, a scanning technique is introduced and its applicability is investigated.
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Pfeifer, C., Moeck, J.P., Paschereit, C.O., Enghardt, L. (2009). Localization of Sound Sources in Combustion Chambers. In: Schwarz, A., Janicka, J. (eds) Combustion Noise. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02038-4_10
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DOI: https://doi.org/10.1007/978-3-642-02038-4_10
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