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Communication Dans Un Congrès Année : 2018

Limits of perfect sound absorption in thinaluminum square plates

Résumé

Flexural waves are the main type of waves propagating in thin plates and play a relevant role in the eld of noise and vibration. In this work, the study of the conditions for the absorption of sound due to exural resonances is reported. Two systems composed of thin clamped aluminum square plates with an absorptive layer in contact are studied: (i) a plate backed by an air cavity ended by a rigid wall, and (ii) a plate in contact with an absorptive layer. Absorption in both systems is studied analytically and numerically by using the transfer matrix method and considering viscoelastic and viscothermal losses in the waveguide and in the plate, respectively. The Ross-Kerwin-Ungar (RKU) model is used to model the absorptive layer. For the case of the re ection problem (rigidly backed system), the analysis of the re ection coe cient in the complex frequency plane is used to identify the zeros and poles of this coe cient and to tune the overall losses of the system in order to establish the conditions for achieving critical coupling and, thus, perfect sound absorption. For the case of the transmission problem, the system is not rigidly backed, and losses are increased by adding an absorptive layer in contact with the plate, creating a composite that is analyzed as a single layer with e ective properties.
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Dates et versions

hal-02514167 , version 1 (21-03-2020)

Identifiants

  • HAL Id : hal-02514167 , version 1

Citer

Iván Herrero-Durá, Ruben Pico, Victor Sanchez-Morcillo, Lluis Miquel Garcia-Raffi, Vicente Romero-García. Limits of perfect sound absorption in thinaluminum square plates. Euronoise 2018, May 2018, Crete, Greece. ⟨hal-02514167⟩
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