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• W2791561051 abstract "Acoustic metamaterials hold great potential for attenuation of low frequency acoustic emissions. However, a fundamental challenge is achieving high transmission loss over a broad frequency range. In this work, we report a double negative acoustic metastructure for absorption of low frequency acoustic emissions in an aircraft. This is achieved by utilizing a periodic array of hexagonal cells interconnected with a neck and mounted with an elastic membrane on both ends. An average transmission loss of 56 dB under 500 Hz and an overall absorption of over 48% have been realized experimentally. The negative mass density is derived from the dipolar resonances created as a result of the in-phase movement of the membranes. Further, the negative bulk modulus is ascribed to the combined effect of out-of-phase acceleration of the membranes and the Helmholtz resonator. The proposed metastructure enables absorption of low frequency acoustic emissions with improved functionality that is highly desirable for varied applications." @default.
• W2791561051 created "2018-03-29" @default.
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• W2791561051 date "2018-03-05" @default.
• W2791561051 modified "2023-10-01" @default.
• W2791561051 title "Double negative acoustic metastructure for attenuation of acoustic emissions" @default.
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• W2791561051 doi "https://doi.org/10.1063/1.5022602" @default.
• W2791561051 hasPublicationYear "2018" @default.
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