Variability of highway noise barrier insertion loss in the atmosphere

This study is concerned with the theoretical solution to the problem of sound screening by simple hard barriers on the ground with special emphasis given to the type of wave incidence, namely a comparison between the use of either a spherical or a cylindrical sound source. For a receiver at the shadow of the noise source, the field may be assumed to be due to the edge wave and for this, exact solutions are used. Regarding the wave reflection on an impedance ground, exact formulations are also used, and finally, some calculations are made on the performance of a hard noise barrier on a two-impedance ground. As a conclusion, it is found that although the sound level at the receiver may show some small differences depending on the frequency and on the geometry of the problem, the overall insertion loss of the thin hard barrier is almost the same for the spherical and the line source, and the differences are found to amount to less than 1 dB for geometries of practical occurrence.

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A model for insertion loss degradation for parallel highway noise barriers

The Journal of the Acoustical Society of America ◽

10.1121/1.393909 ◽

1986 ◽

Vol 80 (3) ◽

pp. 855-868 ◽

Cited By ~ 15

Author(s):

William Bowlby ◽

Louis F. Cohn

Keyword(s):

Insertion Loss ◽

Noise Barriers ◽

Highway Noise

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STUDY ON EFFECTIVE NOISE BARRIER AT SENIOR HIGH SCHOOL (SMAN 02) CIBINONG

INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY ◽

10.25105/urbanenvirotech.v0i0.4360 ◽

2019 ◽

Vol 2 (2) ◽

pp. 181

Author(s):

Aulia Ramandha ◽

Wisnu Eka Yulyanto ◽

Sandra Madonna

Keyword(s):

High School ◽

Insertion Loss ◽

Noise Level ◽

Road Traffic ◽

Traffic Noise ◽

Road Traffic Noise ◽

Type Ii ◽

Noise Barrier ◽

Barrier Type ◽

The Difference

Aim: The aim of this study is to design noise barrier shapes and to investigate its effectiveness in reducing traffic noise at one public school in Indonesia. Methodology and Results: Two types of barriers were designed on a laboratory scale using plywood materials and the noise level was measured using Noise Analyzer Briiel and Kjaer Type 2250. Noise reduction was analyzed by using the Insertion Loss method based on the difference of the noise level before and after implementing the barrier. The results show that the barrier Type II with a length of 200 cm, a receiver height of 30 cm, and a curved shape of 45° angle (Type L) is more effective in reducing the noise than the other variation of barrier shape and length. Barrier Type L (Type II) can reduce the noise at high frequency between 1–8 kHz with an Insertion Loss value of 6.9–27.9 dB. Conclusion, significance and impact study: The noise barrier Type II, with specifications of 20 m length, 3 m height, and barrier material of reinforced concrete, is recommended to be used at the high school to reduce the road traffic noise.

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Full‐scale model investigations into insertion loss of highway noise barriers under different atmospheric conditions

The Journal of the Acoustical Society of America ◽

10.1121/1.421863 ◽

1998 ◽

Vol 103 (5) ◽

pp. 2801-2801

Author(s):

Scott D. Hansen ◽

Courtney B. Burroughs ◽

Kenneth E. Gilbert

Keyword(s):

Insertion Loss ◽

Full Scale ◽

Scale Model ◽

Atmospheric Conditions ◽

Noise Barriers ◽

Highway Noise

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Analysis on Traffic Noise Attenuation by Using Sound Barrier

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.584-586.776 ◽

2014 ◽

Vol 584-586 ◽

pp. 776-779

Author(s):

Xian Feng Huang ◽

Chen Hui Zhu ◽

Quan Shi

Keyword(s):

Sound Source ◽

Insertion Loss ◽

Traffic Noise ◽

Noise Attenuation ◽

Noise Barriers ◽

Sound Barrier ◽

Noise Barrier ◽

Significant Attenuation ◽

Infinite Line ◽

Insertion Losses

By applying noise insertion loss predicting model of the noise barriers, influencing factors on insertion loss of the sound barrier are investigated for achieving the significant attenuation effects. In term of the infinite line sound source and the finite length of the barriers, the sound insertion losses with varying parameters are calculated and compared. Finally, the meaningful results indicate that the economic and reasonable height and length of the noise barrier are gained to be beneficial for barrier design.

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