scholarly journals Noise barrier using hybrid ANC system (Supression of the noise enhancement caused by the waterbed effect and investigation of the noise attenuation performace under various sound field configurations)

2015 ◽  
Vol 81 (827) ◽  
pp. 15-00064-15-00064 ◽  
Author(s):  
Xun WANG ◽  
Yosuke KOBA ◽  
Satoshi ISHIKAWA ◽  
Shinya KIJIMOTO
Keyword(s):  
Sound Field ◽  
Noise Attenuation ◽  
Noise Barrier

343 Sound Field Analysis for the Design and Development of Environmentally-Conscious Noise Barrier

2007 ◽  
Vol 2007 (0) ◽  
pp. _343-1_-_343-6_
Author(s):  
Noritoshi NAKAGAWA ◽  
Akihiko HIGASHI ◽  
Toshihiro OKAMOTO ◽  
Kazufumi IWAI
Keyword(s):  
Sound Field ◽  
Field Analysis ◽  
Design And Development ◽  
Environmentally Conscious ◽  
Noise Barrier

scholarly journals Recent Developments of Noise Attenuation Using Acoustic Barriers for a Specific Edge Geometry

Computation ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 129
Author(s):  
Mihai Bugaru ◽  
Ovidiu Vasile ◽  
Marian Neagoe
Keyword(s):  
Prediction Method ◽  
Diffraction Theory ◽  
New Method ◽  
Noise Attenuation ◽  
Atmospheric Absorption ◽  
Edge Geometry ◽  
Recent Developments ◽  
Noise Barrier ◽  
Specific Geometry ◽  
Meteorological Effect

The aim of this research is to provide a better prediction for noise attenuation using thin rigid barriers. In particular, the paper presents an analysis on four methods of computing the noise attenuation using acoustic barriers: Maekawa-Tatge formulation, Kurze and Anderson algorithm, Menounou formulation, and the general prediction method (GPM-ISO 9613). Accordingly, to improve the GPM, the prediction computation of noise attenuation was optimized for an acoustic barrier by considering new effects, such as attenuation due to geometrical divergence, ground absorption-reflections, and atmospheric absorption. The new method, modified GPM (MGPM), was tested for the optimization of an y-shape edge geometry of the noise barrier and a closed agreement with the experimental data was found in the published literature. The specific y-shape edge geometry of the noise barrier contributes to the attenuation due to the diffraction phenomena. This aspect is based on the Kirchhoff diffraction theory that contains the Huygens-Fresnel theory, which is applied to a semi-infinite acoustic barrier. The new method MGPM of predicting the noise attenuation using acoustic barriers takes into consideration the next phenomena: The effect of the relative position of the receiver, the effect of the proximity of the source or receiver to the midplane of the barrier, the effect of the proximity of the receiver to the shadow boundary, the effect of ground absorption-reflections, the effect of atmospheric absorption, and the meteorological effect due to downwind. The conclusion of the paper reveals the optimization of the method for computing the noise attenuation using acoustic barriers, including the necessary corrections for ISO-9613 and the Sound PLAN software, as well as the optimization on a case study of a specific geometry of the edge barrier.

SOPRANOISE - update and analysis of noise barrier database including new current results

2021 ◽  
Vol 263 (3) ◽  
pp. 3073-3084
Author(s):  
Marco Conter ◽  
Andreas Fuchs ◽  
Paul Reiter
Keyword(s):  
Sound Field ◽  
Research Programme ◽  
Field Conditions ◽  
Background Information ◽  
Noise Barriers ◽  
Field Methods ◽  
Acoustic Performance ◽  
Measurement Results ◽  
Noise Barrier ◽  
Single Number

In the frame of the SOPRANOISE project (funded by CEDR in the Transnational Road Research Programme 2018) work package 2 focused first on providing theoretical and practical background information on measurement of the acoustic performance of noise barriers due to a state-of-the-art regarding correlations and possible trends between diffuse (EN 1793-1, EN 1793-2) and direct sound field methods (EN 1793-5, EN 1793-6). After that, the objective of this research was to extend and update the database of the European noise barrier market developed during the QUIESST project, including more detailed analyses on single-number ratings as well as third-octave band measurement results. The data collected and the analysis performed show relevant facts and figures about acoustic performances of noise barriers measured under diffuse and direct sound field conditions, together with a better understanding of the respective significance, similarities and differences of these standardized methods, improving data analysis and correlations between these methods. This paper gives a general overview of the data collected, summarising the main results of the statistical analyses performed. Overall results and comparisons between results of measurements performed under diffuse and under direct sound field conditions are shown. Finally, conclusions and possible outlook of the research are presented.

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.

Applications of noise barriers with a slanted flat-tip jagged cantilever for noise attenuation on a construction site

2017 ◽  
Vol 24 (22) ◽  
pp. 5225-5232 ◽  
Author(s):  
Wang Zhaomeng ◽  
Lim Kian Meng ◽  
Prachee Priyadarshinee ◽  
Lee Heow Pueh
Keyword(s):  
Noise Pollution ◽  
Comfort Level ◽  
Destructive Interference ◽  
Noise Attenuation ◽  
Construction Site ◽  
Cross Sectional ◽  
Sound Fields ◽  
Noise Barrier ◽  
Sectional Profile ◽  
Level Of Living

Construction noise is one of the main sources of noise pollution in many cities, and degrades the comfort level of living spaces. It was previously reported that a noise barrier with a wide “cross-sectional profile” (e.g., T- or Y-shaped) could enhance the noise attenuation performance, and the jagged edge “longitudinal profile” on the top edge of the noise barrier could generate destructive interference sound fields behind the noise barrier, which could further reduce the noise levels. The present paper attempts to study the noise attenuation performances of jagged edge profiles applied on the edge of a cantilever, which was mounted at the top of a commercial passive noise barrier. In addition to the numerical simulations, the full-sized prototypes were also experimentally tested on a construction site with noise generated by a boring machine. Both numerical simulation and experimental results showed that this barrier with slanted flat-tip jagged cantilever would perform better than the traditional barrier having a Straight edge cantilever of same height, with a maximum additional attenuation of 5.0 dBA obtained experimentally. The barrier with a slanted flat-tip jagged cantilever could also extend the shadow zone behind the barrier to higher levels.

EVALUATION OF NOISE ATTENUATION OF BARRIERS WITH GREENERY IN THE CZECH REPUBLIC

Akustika ◽  
2021 ◽  
pp. 8-17
Author(s):  
Petra Marková ◽  
Vítězslav Křivánek ◽  
Blanka Hablovičová ◽  
Jindřich Frič
Keyword(s):  
Czech Republic ◽  
Growing Season ◽  
Noise Attenuation ◽  
Short Term ◽  
Noise Barriers ◽  
The Czech Republic ◽  
Measurement Results ◽  
Different Types ◽  
Noise Barrier

The article is focused on the measurements of different types of “environmental” built noise barriers (semi-vegetation, green belt, barriers with vegetation) which were measured in the different places in the Czech Republic. In situ measuring was carried out in accordance with the standard ISO 1996. Short-term synchronous measurements were carried out in front of and behind the noise barrier and the effectiveness of noise barriers was determined. The measurement results show a slight increase in acute attenuation in anti-noise elements using vegetation. During the growing season, when greening occurs, a more pronounced acoustic attenuation compared to dormancy has been clearly demonstrated. This research was supported by the Ministry of Transport of the Czech Republic.

scholarly journals Noise Reduction Using Concrete Barriers: A Case Study

2021 ◽  
Vol 1197 (1) ◽  
pp. 012010
Author(s):  
A. K. Dasarathy ◽  
M. Tamil selvi
Keyword(s):  
Noise Reduction ◽  
Noise Pollution ◽  
Noise Attenuation ◽  
Noise Barriers ◽  
Innovative Design ◽  
Attenuation Effect ◽  
Traffic Conditions ◽  
Sound Barriers ◽  
Noise Barrier

Abstract Noise pollution is becoming more and more acute, and hence many researchers are studying the noise attenuation effect and prevention of noise. In this study an attempt has been made to find the reduction in noise levels at National Highway 45 near peerkankaranai in Chennai. Two sensitive places were selected along NH 45 by examining attenuation of noise by providing noise barriers in the form of concrete structures. The primary goal of this project was to identify innovative design of noise barrier that has the potential to be implemented in NH 45, Chennai. Based on the research and evaluation conducted for this study, it was recommended that two innovative barrier designs be implemented in Chennai. First, a noise prediction is made at the specified location on the highway under certain traffic conditions in order to determine the noise level by measurement and decide on the barrier requirement. The installation of sound barriers is feasible enough to cause a significant decrease in noise pollution at the roads. Considerable noise attenuation is achieved by providing concrete noise barrier. The paper provides Leq at the time of traffic data recorded was 105.1 dBA at NH45 and 91.108 dBA at NH5 during the time of observation at installation of barrier the values are 70.09 dBA 79.11 dBA, respectively. Noise reduction is possible and noise reduction is predominantly reduced by providing barrier.

Sign in / Sign up

Export Citation Format

Share Document