scholarly journals A study on the insertion loss of a noise barrier for a directional sound source.

1999 ◽  
Vol 20 (4) ◽  
pp. 325-328 ◽  
Author(s):  
Gensei Matsumoto ◽  
Kyoji Fujiwara ◽  
Akira Omoto
Keyword(s):  
Sound Source ◽  
Insertion Loss ◽  
Noise Barrier

NOISE SHIELDING BY SIMPLE BARRIERS: COMPARISON BETWEEN THE PERFORMANCE OF SPHERICAL AND LINE SOUND SOURCES

2000 ◽  
Vol 08 (03) ◽  
pp. 495-502 ◽  
Author(s):  
D. OUIS
Keyword(s):  
Sound Source ◽  
Insertion Loss ◽  
Line Source ◽  
Wave Reflection ◽  
Noise Source ◽  
Sound Level ◽  
Sound Sources ◽  
Noise Shielding ◽  
Noise Barrier ◽  
Wave Incidence

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.

Analysis on Traffic Noise Attenuation by Using Sound Barrier

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.

scholarly journals Investigation for insertion loss of noise barrier for sound source moving at high speed

2003 ◽  
Vol 24 (3) ◽  
pp. 148-150 ◽  
Author(s):  
Seigo Ogata ◽  
Hideo Tsuru ◽  
Hirofumi Nakajima ◽  
Kyoji Fujiwara
Keyword(s):  
Sound Source ◽  
Insertion Loss ◽  
High Speed ◽  
Noise Barrier

Variability of highway noise barrier insertion loss in the atmosphere

1998 ◽  
Vol 104 (3) ◽  
pp. 1750-1750
Author(s):  
Scott D. Hansen ◽  
Courtney B. Burroughs
Keyword(s):  
Insertion Loss ◽  
Noise Barrier ◽  
Highway Noise

scholarly journals Prediction of insertion loss of detached houses against road traffic noise using a point sound source model

2015 ◽  
Vol 36 (2) ◽  
pp. 109-119 ◽  
Author(s):  
Kazutoshi Fujimoto ◽  
Kyosuke Tsuji ◽  
Toru Tominaga ◽  
Kengo Morita
Keyword(s):  
Sound Source ◽  
Insertion Loss ◽  
Road Traffic ◽  
Traffic Noise ◽  
Source Model ◽  
Road Traffic Noise

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

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

<strong>Aim:</strong> 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. <strong>Methodology and Results:</strong> 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. <strong>Conclusion, significance and impact study:</strong> 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.

Review of New City Viaduct Noise Barrier

2014 ◽  
Vol 1044-1045 ◽  
pp. 532-535
Author(s):  
J.L. Zhou ◽  
Shu Qian Wu ◽  
G.Q. Wu
Keyword(s):  
Sound Source ◽  
Local Area ◽  
Acoustic Environment ◽  
Sound Barrier ◽  
Noise Barrier ◽  
Dissemination Process ◽  
New City ◽  
Further Development ◽  
Research Situation

Noise not only makes people worry, sleep disturbance, hinder learning to work and rest, affect human health, and it is difficult to completely eliminate. Sound barrier is located in the sound source and the sound receiving point between the structure with shielding enough surface density of sound, built finite noise barrier of sound source by both local area can make the operation noise source in the dissemination process has a significant additional attenuation, which weakens the noise influence in certain areas where the recipient within, to improve the quality of acoustic environment of the surrounding environment. The present research situation of new sound barrier and the research content of new sound barrier are summarized. The theoretical reference for the further development of new sound barrier is provided.

scholarly journals Possibilities of Evaluating the Effectiveness of Noise Barriers in Slovakia

2021 ◽  
Vol 11 (21) ◽  
pp. 10206
Author(s):  
Alžbeta Pultznerová ◽  
Ján Šimo ◽  
Juraj Grenčík
Keyword(s):  
Insertion Loss ◽  
Urban Areas ◽  
Indirect Method ◽  
Material Design ◽  
Sound Insulation ◽  
Noise Barriers ◽  
Advantages And Disadvantages ◽  
Airborne Sound ◽  
A Value ◽  
Noise Barrier

This paper presents environmental acute problems from increasing noise levels caused by automobile and rail transport. Noise barriers are considered to be an effective element in reducing noise in densely populated urban areas. However, do these barriers have the correct height, shape, material design, and construction? In the materials and methods, the basic characteristics of noise barrier, sound absorption, and sound insulation are described. Further, measurement methods of the insertion loss of outdoor noise barriers of all types using the direct and indirect method according to standard ISO 10847 and the Adrienne method according to standards EN 1793-5 and EN 1793-6 are presented. The measurement results of insertion loss of the selected noise barrier obtained by the indirect method showed a value of 19.1 dB(A) of insertion loss. This result was compared with simulation by our own software based on the CNOSSOS methodology, giving value of 19.6 dB(A), which is a good correlation. The Adrienne method was used for determination of the airborne sound insulation index of another noise barrier, giving a value of the single-number rating of the sound insulation of the barrier of 28 dB. In discussion, according to EN 1793-2, this value assigns an insulation index of category D3, which means that the barrier is high quality and has satisfactory airborne sound insulation. The advantages and disadvantages of both methods according to STN ISO 10847 and STN EN 1793-6 were discussed. We concluded that the main advantage of the method Adrienne—TN EN 1793-6 is that it can be used in situ under direct sound field conditions and can directly evaluate the sound insulation index of the whole barrier structure.

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