- Volume 18 Issue 6
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.
Noise protection roof;Noise barrier;Railway noise;Acoustic louver;Ray tracing method
- D.J. Kang, W.S. Lee, J.W. Lee, Y.C. Kim, et al. (2002) A study on the calculation of population exposed to transportation noise (II), Report of NIER. Korea, National Institute of Environmental Research, Vol.24, pp. 259-275.
- Ministry of environment, Achieved at www.noiseinfo.or.kr/index.jsp (Accessed 15 March 2015).
- Ministry of environment (2014) Guidelines on noise barrier performance and construction.
- H.S. Na, Y.G. Kim, T.R. Seong (1999) Reduction of traffic noise using soundproof tunnel, Proceedings of the Autumn Conference of the Korean Society for Noise and Vibration Engineering, pp. 75-80.
- B.S. Kim, T.K. Lee, S.I. Han, D.Y.Y, et al. (2010) Counter plan for reduction of Elevated Railway Bridge Noise, Proceedings of the Spring Conference of the Korean Society for Railway, pp. 6-12.
- B. Kotzen (2009) Environmental Noise Barriers: A Guide to Their Acoustic and Visual Design, Taylor & Francis, London, England, pp. 1-264.
- Raynoise revision 3.1 users manual, LMS International.
- Yooshin co., Ltd. (2014) Technology development for railway lightweight tunnel, Korea Railroad Research Institute.
- T.-M. Kim, J.-S. Kim (2014) Analysis of Aerodynamic Noise at Inter-coach Space of High Speed Trains, International Journal of Railway, 7(4), pp. 100-108. https://doi.org/10.7782/IJR.2014.7.4.100
- ADINA basic training (2014) ableMAX company.
- J.W. Yoon, Y.C. Kim, K.M. Kim, K.S. Jang et al. (2011) A Study on the development and application of air-passing soundproofing wall, Proceedings of the autumn Conference of the Korean Society for Noise and Vibration Engineering, pp. 658-663.
- Ministry of Land, Infrastructure and Transport (2014) Standard on building structure.
- S.J. Jeong (2012) A study on air pollution dispersion around single windbreak and combination of hill and windbreak using CFD model, Korean Journal of Odor Research and Engineering, 11(1), pp.15-23.
- ESI(2014) VA ONE users manual.
- An experimental analysis of the sound reduction characteristics of air transparent noise barriers vol.35, pp.6, 2016, https://doi.org/10.7776/ASK.2016.35.6.491
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