Analysis of a Geometrical-Stiffening Membrane Acoustic Metamaterial with Individually Tunable Multi-Frequencies

• Autorzy: Zhao Junjuan , Li Xianhui , Thompson David , Wang Yueyue , Wang Wenjiang , Zhu Liying , Liu Yunan

Identyfikatory

DOI

10.24425/aoa.2021.136563

• Języki publikacji: EN

Abstrakty

EN

To realize a structure which can be conveniently tuned to multiple and wideband frequency ranges, a geometrical-stiffening membrane acoustic metamaterial (MAM) with individually tunable multiple frequencies is presented. The MAM is realized by a stacked arrangement of two membrane-magnet elements, each of which has a membrane with a small piece of steel attached in the centre. It can be tuned individually by adjusting the position of its compact magnet. The normal incidence sound transmission loss of the MAM is investigated in detail by measurements in an impedance tube. The test sample results demonstrate that this structure can easily achieve a transmission loss with two peaks which can be shifted individually in a wide low-frequency range. A theoretical consideration is analysed, the analysis shows that the magnetic effect related to this distance leads to a nonlinear attractive force and, consequently, nonlinear geometrical stiffening in each membrane-magnet element, which allows the peaks to be shifted. A reasonable design can make the structure have a good application prospect for low-frequency noise insulation where there is a need to adjust the transmission loss according to the spectrum of the noise source.

Słowa kluczowe

EN

membrane acoustic metamaterial; nonlinear geometric stiffening; low frequency tuning; sound transmission

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2021
• Tom: Vol. 46, No. 1
• Strony: 87--93
• Opis fizyczny: Bibliogr. 23 poz., rys., wykr.

Twórcy

autor

Zhao Junjuan

• Beijing Key Lab of Environmental Noise and Vibration, Beijing Municipal Institute of Labor Protection, Beijing, China, 100054

autor

Li Xianhui

• Beijing Key Lab of Environmental Noise and Vibration, Beijing Municipal Institute of Labor Protection, Beijing, China, 100054

autor

Thompson David

• Institute of Sound and Vibration Research, University of Southampton, Southampton, UK, SO171BJ

autor

Wang Yueyue

• Beijing Key Lab of Environmental Noise and Vibration, Beijing Municipal Institute of Labor Protection, Beijing, China, 100054

autor

Wang Wenjiang

• Beijing Key Lab of Environmental Noise and Vibration, Beijing Municipal Institute of Labor Protection, Beijing, China, 100054

autor

Zhu Liying

• Beijing Key Lab of Environmental Noise and Vibration, Beijing Municipal Institute of Labor Protection, Beijing, China, 100054

autor

Liu Yunan

• Beijing Key Lab of Environmental Noise and Vibration, Beijing Municipal Institute of Labor Protection, Beijing, China, 100054

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).