Measurement of Sound Transmission Loss Properties in Single & amp; Multi-layered Systems - A Comparative Study between Two-room and Standing Wave Tube Techniques

2011 ◽  
Vol 4 (2) ◽  
pp. 1231-1240 ◽  
Author(s):  
Kent K.H. Fung ◽  
Xiaochuan Li ◽  
Wei Huang ◽  
Richard E. Wentzel ◽  
Keda zhu
Keyword(s):  
Comparative Study ◽  
Standing Wave ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Sound Transmission Loss ◽  
Wave Tube ◽  
Layered Systems ◽  
Standing Wave Tube

Sound Transmission Loss of Adhesively Bonded Sandwich Panels with Pyramidal Truss Core: Theory and Experiment

2015 ◽  
Vol 07 (01) ◽  
pp. 1550013 ◽  
Author(s):  
C. Shen ◽  
Q. C. Zhang ◽  
S. Q. Chen ◽  
H. Y. Xia ◽  
F. Jin
Keyword(s):  
Adhesive Bonding ◽  
Transmission Loss ◽  
Sandwich Panels ◽  
Sound Transmission ◽  
Homogenization Theory ◽  
Sound Insulation ◽  
Sound Transmission Loss ◽  
Adhesively Bonded ◽  
Effective Elastic Constant ◽  
Standing Wave Tube

In this paper, an analytical model is developed to investigate sound transmission loss characteristic of adhesively bonded metal sandwich panels with pyramidal lattice truss cores based on 3D elasticity theory. Meanwhile, practical specimen is fabricated to conduct corresponding sound insulation experiment test via a standing wave tube method. The effective elastic constant of truss cores is derived using one homogenization theory on account of equivalent strain energy. It is found that satisfactory agreement is achieved between theoretical solutions and experiment results, and damping effect of adhesive bonding interface between facesheets and core has a great impact on transmission loss. Further parameter investigations demonstrate the significant effect of the elevation and azimuth angles of the pyramidal cores, which can be conveniently changed to tailor the acoustic performance of the sandwich panels in the whole frequency range.

Errors in the measurement of transmission loss in a standing wave tube

2017 ◽  
Vol 65 (3) ◽  
pp. 174-182 ◽  
Author(s):  
Lang Dong ◽  
Yansong Wang ◽  
Hui Guo ◽  
Ningning Liu
Keyword(s):  
Standing Wave ◽  
Transmission Loss ◽  
Wave Tube ◽  
Standing Wave Tube

scholarly journals Analysis of the transmission loss of double-leaf panels with an equivalent spring–mass model for studs

2020 ◽  
Vol 37 ◽  
pp. 126-133
Author(s):  
Yuan-Wei Li ◽  
Chao-Nan Wang
Keyword(s):  
Distribution Curve ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Experimental Results ◽  
Sound Insulation ◽  
Sound Transmission Loss ◽  
Mass Model ◽  
Steel Stud ◽  
Panel Thickness ◽  
Stiffness Distribution

Abstract The purpose of this study was to investigate the sound insulation of double-leaf panels. In practice, double-leaf panels require a stud between two surface panels. To simplify the analysis, a stud was modeled as a spring and mass. Studies have indicated that the stiffness of the equivalent spring is not a constant and varies with the frequency of sound. Therefore, a frequency-dependent stiffness curve was used to model the effect of the stud to analyze the sound insulation of a double-leaf panel. First, the sound transmission loss of a panel reported by Halliwell was used to fit the results of this study to determine the stiffness of the distribution curve. With this stiffness distribution of steel stud, some previous proposed panels are also analyzed and are compared to the experimental results in the literature. The agreement is good. Finally, the effects of parameters, such as the thickness and density of the panel, thickness of the stud and spacing of the stud, on the sound insulation of double-leaf panels were analyzed.

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