Simulation of noise barrier insertion loss using the boundary element method

2008 ◽  
Vol 123 (5) ◽  
pp. 3419-3419 ◽  
Author(s):  
Holger Waubke ◽  
Wolfgang Kreuzer ◽  
Zhensheng Chen
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Insertion Loss ◽  
Noise Barrier ◽  
Element Method

scholarly journals Sound field study of a building near a roadway via the boundary element method

2017 ◽  
Vol 37 (3) ◽  
pp. 519-533 ◽  
Author(s):  
Haibo Wang ◽  
Ming Cai ◽  
Shuqi Zhong ◽  
Feng Li
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Insertion Loss ◽  
Sound Field ◽  
Road Traffic Noise ◽  
Heavy Vehicles ◽  
Main Frequency ◽  
Aspect Ratios ◽  
Hankel Functions ◽  
Element Method

A two-dimensional boundary element method with a constant element type was adopted to study the sound field of a building near a roadway. First, a factor analysis of the computed results has been done, which include the element length, the Hankel functions’ calculation accuracy, and numerical integration accuracy. Then, boundary element method is applied to calculate building attenuation with different building aspect ratios and different frequencies with balconies, followed by drawing of the sound field distribution diagram. The calculation results revealed the following: (1) a wider building results in a more severe sound attenuation; (2) balconies on different floors produce a reduction of approximately 15 dB for broadband spectral characteristics of A-weight road traffic noise, and the maximum values appear at the bottoms of balconies; (3) for the points in the balconies, higher sound frequencies are correlated to larger insertion loss, with the insertion loss increasing from 3 dB to >10 dB when the sound frequency increases from 20 to 4000 Hz; (4) calculations of three typical frequencies indicate that the insertion loss of 500 Hz (main frequency of heavy vehicles) is 6 dB less than that of 800 Hz (main frequency of light vehicles), i.e. the flow control of heavy vehicles could conspicuously improve the ambient acoustic environment of buildings near a roadway.

Three-dimensional analysis of a noise barrier using a quasi-periodic boundary element method

2015 ◽  
Vol 137 (6) ◽  
pp. 3107-3114 ◽  
Author(s):  
Samaneh M. B. Fard ◽  
Herwig Peters ◽  
Nicole Kessissoglou ◽  
Steffen Marburg
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Dimensional Analysis ◽  
Periodic Boundary ◽  
Three Dimensional ◽  
Noise Barrier ◽  
Element Method

A Study on the Effect of Different Median Barrier Shapes in Presence of Single or Parallel Noise Screens

2011 ◽  
Vol 383-390 ◽  
pp. 5432-5437
Author(s):  
M.R. Monazzam ◽  
Samaneh M.B. Fard
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Insertion Loss ◽  
Noise Pollution ◽  
Noise Barriers ◽  
Negative Effect ◽  
Roadside Barrier ◽  
The Impact ◽  
Mega Cities ◽  
Element Method

In most mega cities roadside barriers are used to protect receivers from noise pollution during recent years. Median noise barriers, like roadside noise barriers, can be employed to reduce the impact of traffic on roadside communities. In this study, a 2D boundary element method (BEM) is used to predict the insertion loss of different barrier models. It was shown that the performance of a median barrier along with a roadside barrier is affected if another road side barrier will be erected. However, it is possible to apply some new barrier designs to decline the negative effect of the extra roadside barrier. The best shape for inclined median barriers when erected inside parallel barriers was seen to be the tilted designed with 10 degrees slope.

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