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- W1971567778 abstract "We present in this paper an active anechoidal termination composed of a porous material, whose absorbent properties are improved by a secondary source. A simple model of acoustic propagation in a porous medium leads to optimal absorption criteria, which are verified by absorption coefficient measurements under normal incidence at the end of a Kundt duct. A secondary source is placed at the backward interface of the material, and imposes zero pressure by destructive interferences, which is a necessary condition for the maximum absorption. Several control set-ups are tested and provide the anechoism for broadband excitations." @default.
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- W1971567778 date "1994-03-01" @default.
- W1971567778 modified "2023-09-27" @default.
- W1971567778 title "Active enhancement of the absorbent properties of a porous material" @default.
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- W1971567778 doi "https://doi.org/10.1088/0964-1726/3/1/004" @default.
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