科研之友
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摘要
This work investigates the use of hybrid double-layer microperforated panel/porous systems as wideband absorbers for applications in the closing of the test area of wind tunnels. For such an application, the absorber should fulfil a twofold requirement: provide absorption in a frequency band ranging from 500 up to 14000 Hz, and the face in contact with the air vein must be free of porous material. The equations for calculating the absorption coefficient at normal incidence allows to predict the performance of such a system as a function of its constitutive parameters. A prototype providing average absorption of 94% in the frequency band (500, 14000) Hz is finally built and validated experimentally in both an impedance tube and a wind tunnel.
- 出版日期2010-10
