Abstract
Under severe acoustic environments such as rocket launching sites, we need to pay particular attention to sound pressure field. However, no numerical method is currently available enough for accurate mapping of sound pressure level especially in case of large sound field due to unclear location and distribution of sound sources. It is then desired to develop new methods to realize accurate estimation of sound pressure field. In this paper the authors propose a new estimation method for the technical desire. The method is basically built up based on the boundary element method and a new equivalent sound source identification for modeling actual sound sources. Furthermore, since the number of the velocity parameters to be determined is more than that of sound pressure measurement points in practice, the singular value decomposition method is used in the solution process of the inverse problem in the identification. Experiment is also carried out for verification using sound of 300Hz and 600Hz in a semi-anechoic camber. As a result, it is proved that the estimation method has enough potential ability to estimate acoustic fields with a practical accuracy.
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