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Monday, July 8 • 11:00 - 13:30
ANALYSIS OF SOUND ABSORPTION CHARACTERISTICS OF DAMPING PLATE EMBEDDED WITH MULTI-SCALE CAVITIES

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Starting from the application of Alberich anechoic layers, the cavity structure has been widely stud-ied and applied in the field of underwater sound absorption. The sound absorption performance of the structure is closely related to structural parameters such as cavity radius and height. The struc-ture with large cavity radius has good low-frequency performance but narrow frequency band, and performs poorly in high-frequency band; and the structure with small cavity radius is just opposite. This makes it difficult to combine low-frequency and broadband sound absorption performance simultaneously with a single-scale cavity structure. To solve this problem, a multi-scale cavity structure was designed based on the sound absorption characteristics and mechanism of cylindrical cavity. For cavities with different radius, the sound absorption bands are different. Designed with appropriate structure and parameters, different cavities could be combined together to achieve high-efficiency sound absorption in a wide frequency band. The finite element method was used to cal-culate theoretically and simulate the structure. With parallel models of multi-scale cavities con-structed, the influence of the spatial arrangement of the cavities and the structural parameters on the sound absorption performance were studied. The results show that the multi-scale cavity model de-signed in this paper owns broader band compared with single cylindrical cavity structure.


Monday July 8, 2019 11:00 - 13:30 EDT
St-Laurent 3, Board 11-B
  T08 Mat. for noise & vibr. cntrl., SS01 Pasv snd absorb & insul mtrl