On the Interaction of Resonance And Bragg Scattering Effects for the Locally Resonant Phononic Crystal with Alternating Elastic and Fluid Matrices

• Autorzy: Yuan B. , Chen Y. , Jiang M. , Tang S. , He M. , Tu M.

Identyfikatory

DOI

10.1515/aoa-2017-0075

• Języki publikacji: EN

Abstrakty

EN

Three-dimensional (3D) locally resonant phononic crystals (LRPCs) are studied with the aim of optimising the sub-wavelength band gaps of such composites. By analysing their effective acoustic properties, it has been found that the effective acoustic speed of the composite will drop to zero when local resonance arise, and will increase monotonically when Bragg scattering effects occur. Moreover, if the matrix is a low-shear-speed medium, local resonators can significantly reduce the effective acoustic speed of the composite and, therefore, lower the frequency where Bragg scattering effects occur. Hence, a specific LRPC with alternating elastic and fluid matrices is proposed, whose resonance and Bragg gaps are already close in frequency. The fluid matrix behaves as a wave filter, which prevents the shear waves from propagating in the composite. By using the layer-multiple-scattering theory, the coupling behaviour of local resonance and Bragg scattering band gaps has been investigated. Both gaps are enhanced when they move closer to each other. Finally, a gap-coupled case is obtained that displays a broad sub-wavelength band gap. Such proposal excels at the application of underwater acoustic materials since the arrangement of structure can be handily adjusted for tuning the frequency of coupled gap.

Słowa kluczowe

EN

locally resonant phononic crystals; effective speed of sound; coupling band gaps; underwater acoustic materials

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2017
• Tom: Vol. 42, No. 4
• Strony: 725--733
• Opis fizyczny: Bibliogr. 21 poz., rys., wykr.

Twórcy

autor

Yuan B.

• Department of Machinery and Electrical Engineering, Army Logistics University of PLA, 401311, Chongqing, China

autor

Chen Y.

• College of Aerospace Science and Engineering, National University of Defense Technology, 410073, Changsha, China

autor

Jiang M.

• Department of Machinery and Electrical Engineering, Army Logistics University of PLA, 401311, Chongqing, China

autor

Tang S.

• Department of Machinery and Electrical Engineering, Army Logistics University of PLA, 401311, Chongqing, China

autor

He M.

• Department of Military Engineering Management, Army Logistics University of PLA, 401311, Chongqing, China

autor

Tu M.

• Department of Machinery and Electrical Engineering, Army Logistics University of PLA, 401311, Chongqing, China

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).