期刊
APPLIED ACOUSTICS
卷 70, 期 1, 页码 165-171出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2007.12.002
关键词
Noise control; Multiple-layered panels; Transmission loss; Impedance tube
类别
Sound insulation of triple-layered panels consisting of two impervious layers with the middle layer being a Newtonian fluid is studied here both theoretically and experimentally. The progressive impedance model is used to predict the transmission loss (TL) provided by the panel in a normal incidence field. Corrections are then made to obtain the TL values of such panels in random incidence field. A modified B&K impedance tube was constructed for experimental evaluation. Results are presented for a Pyrex glass cylindrical tube containing motor oil, a ferromagnetic nanoparticles fluid (in the absence of a magnetic field) and air. Good agreement is obtained between the measured and analytical results for a wide range of frequeucies. Also, a significant difference in TL values, particularly at low frequencies (f <= 4 kHz), is observed once the air is replaced by the fluid layer. (C) 2007 Elsevier Ltd. All rights reserved.
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