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MOESER, M. Improvement of sound barriers using headpieces with acoustical impedance: theory and experimental results. In: CONGRESSO IBEROAMERICANO DE ACÚSTICA, SIMPÓSIO DE METROLOGIA E NORMALIZAÇÃO EM ACÚSTICA E VIBRAÇÕES DO MERCOSUL, 1998, Florianópolis. Anais... Florianópolis, 1998.
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Abstract

The paper deals with the reduction of the sound field in the shadow region behind barriers by means of an attached body at the edge of the screen. The reflecting attributes of the barrier's headpiece, are described by a locally reacting impedance. The considerations start with a repetition on the diffraction at ideal soft and hard bodies to demonstrate the goveming principie of tangential power transport parallel to their surface: the impedance must be chosen in such a way, that the tangential intensity near the edge is lowered, such turning the incoming power to "undangerous" directions. Subsequently, the differences due to finite impedances are discussed. The physical principies are demonstrated in a computer animation of the sound fields for the different cases. Theoretical computations give consíderable improvement of the leve] reduction in the shadow zone for not too small angels of diffraction. They are compared with measurement results, practical applications are discussed.
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