An investigation into the acoustic insulation of triple-layered panels containing Newtonian fluids: Theory and experiment

被引:25
作者
Mahjoob, M. J. [1 ]
Mohammadi, N. [1 ]
Malakooti, S. [1 ]
机构
[1] Univ Tehran, Sch Mech Engn, NVA Res Ctr, Tehran, Iran
关键词
Noise control; Multiple-layered panels; Transmission loss; Impedance tube; TRANSMISSION LOSS; SOUND-TRANSMISSION; PREDICTION; PARTITIONS; IMPEDANCE; SINGLE;
D O I
10.1016/j.apacoust.2007.12.002
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
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.
引用
收藏
页码:165 / 171
页数:7
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