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Noise Protection Roof: Partial Opening Effect for Noise Reduction
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 Title & Authors
Noise Protection Roof: Partial Opening Effect for Noise Reduction
Kim, Tae-Min; Kim, Jeung-Tae;
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 Abstract
In the present study, a tunnel type soundproof wall with partial opening is proposed to reduce the environmental noise caused by railway vehicles traveling on bridges, which affects residents of high-rise apartment buildings; the study also attempts to minimize load due to wind and the weight of the wall. Applying the principles of computational fluid dynamics and structural mechanics, and the ray tracing method, a reduction in noise as well as of the overall weight of the soundproof walls is estimated. Analysis results show that the proposed soundproof wall with a partial opening weighs less, while reducing the wind loading by up to 30%. To prevent direct propagation of sound through openings in the wall, an acoustic louver, which is a type of silencer, could be considered for the opening. In order to achieve a similar noise effect with existing insulation material, the fluid flow and the insulation effect of the acoustic louver are analyzed. As the considered opening is in the range of 30~40% of the total length of the soundproof wall, the noise effect and wind load are reduced by 10dB and 25% respectively. Consequently, opening some part of tunnel type soundproof walls and installing louvers on the wall openings can have the effects of weight-reduction and reduced wind load. If a partial opening is applied with proper sound material application, a gain of an additional 5~10dB of noise reduction can be achieved.
 Keywords
Noise protection roof;Noise barrier;Railway noise;Acoustic louver;Ray tracing method;
 Language
Korean
 Cited by
1.
통기형 방음벽의 음향감쇠 특성에 대한 실험적 분석,박찬재;지용수;임재현;한찬훈;

한국음향학회지, 2016. vol.35. 6, pp.491-500 crossref(new window)
1.
An experimental analysis of the sound reduction characteristics of air transparent noise barriers, The Journal of the Acoustical Society of Korea, 2016, 35, 6, 491  crossref(new windwow)
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