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ISSN: 2165-784X

Journal of Civil & Environmental Engineering
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Research Article

Reduction Effects of Shaped Noise Barrier for Reflected Sound

Lee J1, Kim J1, Park T2, Chang S3 and Kim I1*
1Korea Institute of Civil Engineering and Building Technology (KICT), Goyangdae-Ro, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do, 411-712, Republic of Korea
2Department of Energy and Environmental System Engineering, University of Seoul, 163, Seoulsiripdae-Ro, Dongdaemun-Gu, Seoul, 130-743, Republic of Korea
3Department of Environmental Engineering, University of Seoul, 163, Seoulsiripdae-Ro, Dongdaemun-Gu, Seoul, 130-743, Republic of Korea
Corresponding Author : Kim I
Korea Institute of Civil Engineering and Building Technology (KICT)
283, Goyangdae-Ro, Ilsanseo-Gu
Goyang-Si, Gyeonggi-Do
411-712, Republic of Korea
Tel: +82-31-9100-649
E-mail: [email protected]
Received March 11, 2015; Accepted March 28, 2015; Published April 08, 2015
Citation: Lee J, Kim J, Park T, Chang S, Kim I (2015) Reduction Effects of Shaped Noise Barrier for Reflected Sound. J Civil Environ Eng 5:171. doi:10.4172/2165-784X.1000171
Copyright: © 2015 Lee J, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Noise Barriers are widely installed to control the propagation of vehicle noise from highway. However, the installation may result in a secondary noise caused by reflection, especially, if there exists a residential area on the opposite side. Hence, to effectively use noise barrier, it is mandatory to first predict the noise sources taking place on the roadsides and to apply the findings afterwards. In this study, by evaluating the reduction effects of reflection noise according to different panel shapes including wing, zigzag and curved type, the optimal soundproof panel shape and design factor that can minimize the reflection noise are suggested. The sound reduction was modeled by general linear model for the case of zigzag and curved shape with nominal variances. To simulate the effects of each shape, Nord 2000 with sound traveling model was used. As a result, all panel types have shown reduction effects on reflected sound, with maximum of 2.2 dB for zigzag and 1.2 dB for curved shapes. The designing factors had impact on the density of zigzag type and on the degree of bending in the curved shape. Specifically, for first noise level (up to 5 story building), reduction effect is improved for smaller size of wing type, wider angle between zigzag type panels and gentle slope of curved type. Overall, curved noise barrier labeled as C-9 is found to be the best in diminishing reflection noise. This type of barrier can be effectively used to control damages caused by reflection noise at downtown region, where extent of traffic is increasing from day to day.

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