Abstract
The acoustic filter plate is a device giving a variable aperture, the diameter of which is proportional to the wavelength of the incident sound, thus producing a beamwidth for the transmitted sound that is independent of the wavelength. Previous experimental studies have demonstrated the effectiveness of the filter plate. However, it has been found that the performance of the device is seriously impaired at high frequencies and the purpose of this article is to provide an explanation for this high‐frequency failure. The approach is numerical: The Helmholtz equation describing the propagation of sound through and around the filter plate is solved using the boundary integral element (BIE) method. Good qualitative agreement with the experimental results are obtained at moderate frequencies where the filter plate is operating normally and the reason for the high‐frequency failure is demonstrated.
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