scholarly journals Sound transmission loss: Comparison of conventional techniques with sound intensity techniques

1985 ◽  
Vol 77 (6) ◽  
pp. 2094-2103 ◽  
Author(s):  
R. E. Halliwell ◽  
A. C. C. Warnock
Keyword(s):  
Transmission Loss ◽  
Sound Transmission ◽  
Sound Intensity ◽  
Sound Transmission Loss

Sound Transmission Loss of Thick Perforated Panels

2001 ◽  
Vol 8 (1) ◽  
pp. 41-56 ◽  
Author(s):  
K. T. Chen ◽  
S. H. Jan
Keyword(s):  
Theoretical Analysis ◽  
Critical Frequency ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Sound Intensity ◽  
Sound Transmission Loss ◽  
Coincidence Effect ◽  
Maximum Discrepancy

A study is reported of the sound transmission loss of perforated panels. The study includes a theoretical analysis and measurement by means of sound intensity. The predicted transmission loss is similar to that measured above 630 Hz. The maximum discrepancy is less than 2 dB. The perforation in a thick panel is found to reduce the coincidence effect at the critical frequency.

Acoustic Parts in Vehicle Sound Transmission Loss Test Method Research

2013 ◽  
Vol 380-384 ◽  
pp. 73-76
Author(s):  
Xiu Feng Wang ◽  
Jie Shi
Keyword(s):  
Sound Pressure ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Sound Intensity ◽  
Pressure Level ◽  
Test Method ◽  
Intensity Level ◽  
Sound Transmission Loss ◽  
Passenger Compartment ◽  
Exterior Panel

The sound transmission loss (STL) of the acoustic parts in the vehicle was proposed to be computed using the Sound Pressure Level measured at the several locations inside the vehicle and the transmitted Sound Intensity Level on the vehicles exterior panel, which the acoustic treated vehicle passenger compartment is assumed as a small reverberation room. The necessary parts retrofits and acoustic treatments for Sound transmission loss tests of the acoustic parts in the vehicle were listed. The values of the appropriate number and positions of the loud speakers, microphones and sound intensity probes for Sound transmission loss of the acoustic parts in the vehicle were recommended. The in vehicle sound transmission loss tests of the acoustic parts such as the doors, carpets, wheel house etc. were achieved in the semi-anechoic room. Based on the door system, the correlation work has been done among the methods of the proposed in vehicle STL test, the reverberation - semi-anechoic chamber buck STL test and SEA analysis.

Observations on the Systematic Deviations between Two Methods of Measuring Sound Transmission Loss

1996 ◽  
Vol 3 (1) ◽  
pp. 1-11 ◽  
Author(s):  
F. Jacobsen ◽  
H. Ding
Keyword(s):  
Measurement Errors ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Sound Field ◽  
Sound Intensity ◽  
Field Method ◽  
Sound Transmission Loss ◽  
Careful Measurement ◽  
Linear Decay ◽  
Comparable Size

The paper examines and discusses possible explanations of the systematic deviations between conventional and intensity-based sound transmission loss measurements frequently reported in the literature. Both the conventional diffuse-field method and the method based on the sound intensity technique are subject to several systematic errors of comparable size. The sources of error include non-linear decay functions, the absorption of the partition itself, and intensity measurement errors, which are aggravated by the fact that the sound field conditions are usually fairly difficult. It is concluded that with very careful measurement procedures there are no systematic deviations.

scholarly journals Investigation of Sound Transmission Loss Through Sandwich Panel with Foam Core

2018 ◽  
Vol 26 (6) ◽  
pp. 101-117 ◽  
Author(s):  
Hatem Hadi Obeid ◽  
Huda Nadhim Mohammed
Keyword(s):  
Transmission Loss ◽  
Sound Transmission ◽  
Sound Intensity ◽  
Sound Transmission Loss ◽  
Composite Sandwich ◽  
Acoustic Insulation ◽  
Noise Characteristics ◽  
Important Research Topic ◽  
Core Thickness ◽  
Important Design

In the past years, customer and consumer request are increased for performance sound. Where vibration and noise characteristics are made of important design criteria. The vibro- acoustic behavior is considered in the composite sandwich, important research topic to provide a suitable design with consumer requirements. The sound intensity method is widely using to measure the sound transmission loss between two rooms. This method are used with a composite materials, that are consist of two steel layers between them one layer for core. This paper provides a brief description of the sound intensity method and it is depended on ISO140[1]. Finite Element Method (FEM) are used to comparison with experimental results.The core of different thickness was used to study its effect on acoustic insulation. The experimental and theoretical results are shown, that the value of sound transmission loss are increased by rates of 6dB when the core thickness is doubled .

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