期刊
APPLIED ACOUSTICS
卷 79, 期 -, 页码 47-57出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2013.12.009
关键词
Aircraft noise; Micro-perforated partitions; Absorption and transmission properties
类别
资金
- Carnot STAR Institute in France
- Spanish Council for Scientific Research (CSIC) in Spain
A method for evaluating the absorption and transmission performances of multi-layer micro-perforated structures whose facings are excited by different noise sources is described here. It is applied to determine if the acoustical performances of a number of Micro-Perforated Panels (MPPs), optimised both in absorption and transmission, exceed those of typical aircraft panels undergoing internal and external acoustic excitations. A fully-coupled modal formulation is presented that accounts for the effects of the sub-structure volumetric resonances on the acoustical properties of the partitions. It is validated against full-scale measurements performed with a pressure-velocity probe and a laser vibrometer to estimate the absorption and transmission coefficients of single- and double-layer micro-perforated partitions. The model is used to optimise the sound power dissipated by three layouts obtained from a typical aircraft partition by micro-perforating the trim panel (MPP-Porous-Panel), removing the fibreglass material (MPP-Cavity-Panel) and adding a second MPP inside the separating cavity (MPP-MPP-Panel). It is concluded that the MPP-Porous-Panel and MPP-MPP-Panel layouts provide excess interior noise reduction above 1.8 kHz and 1.2 kHz respectively, whereas the MPP-Cavity-Panel is not acoustically more efficient than a typical aircraft panel. (C) 2013 Elsevier Ltd. All rights reserved.
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