Design of an acoustic metamaterial-based silencer |
کد مقاله : 1106-ISAV |
نویسندگان: |
Giovanni Spena *1، Marialuisa Napolitano2، Elio Di Giulio3، Sabato Di Filippo1، Raffaele Dragonetti3 1Z Lab S.r.l., Via Pisa 7, 37053, Cerea, Italy 2Department of Industrial Engineering, University of Naples Federico II, Naples, Italy, 3Department of Industrial Engineering, University of Naples Federico II, Naples, Italy |
چکیده مقاله: |
Dissipative silencers attenuate the sound by converting acoustic energy into heat due to the friction in the voids between the oscillating gas particles and porous or fibrous absorbent materials. However, they present some criticalities, related to the use of these materials: too high thicknesses necessary to obtain good performance at low frequencies and then increasing costs; problems related to air quality control (bacterial contamination and presence of fibers). In this paper an alternative solution is presented in order to overcome these criticalities. The idea is to realize a silencer based on parallel-assembled acoustic metamaterials, which are arranged in an optimized configuration. For this purpose a new metamaterial was designed, whose acoustic behaviour is analytically described by using the Transfer Matrix Method (TMM), while numerical modeling is performed with a Finite Element software (FEM). Experimental investigations were carried out on a sample of the previously designed metamaterial made by 3D printing. The experimental results in terms of the Transmission Loss (TL) show a good agreement with values of the analytical and numerical models. Furthermore, combining FEM and TMM models, a numerical-analytical hybrid model has been developed, which reduces the computational costs and time, simplifying the design of the silencer. Based on the above-mentioned silencer an example application is then finally provided, showing that it is possible to obtain excellent TL values in small spaces and in desired frequency range. |
کلیدواژه ها: |
Acoustics; Silencer; Metamaterials; Transmission Loss. |
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