Browse > Article
http://dx.doi.org/10.7782/JKSR.2016.19.5.629

Acoustic Performance Evaluation of Noise Barriers Installed Adjacent to Rails and Suggestion of Approximation Formula for the Prediction of Insertion Loss  

Yoon, Je Won (Unison technology Co., Ltd.)
Jang, Kang Seok (Unison technology Co., Ltd.)
Cho, Yong Thung (Department of Mechanical Engineering, Kongju National University)
Publication Information
Journal of the Korean Society for Railway / v.19, no.5, 2016 , pp. 629-637 More about this Journal
Abstract
In this paper, an investigation was conducted to evaluate the acoustic performance of low height noise barriers installed adjacent to rails; an easy-to-use approximation formula was suggested for the evaluation of insertion loss (IL), instead of using the boundary element method. At first, the acoustic performance of the low height noise barriers was measured in an anechoic chamber using a scaled down model; the overall IL according to the source location was analyzed with the equivalent IL contour line. Using the measurement results obtained from the scaled down model, an approximation formula was suggested for the IL of low height noise barriers having various shapes. Also, the prediction program was validated through a comparison between the actual measurement results in the anechoic chamber and the prediction results. Finally, using the prediction program, an approximation formula for IL was suggested for the low height noise absorption barriers. Considering the frequency characteristics of the noise sources of the train, the absorptive low height noise barriers have a 'ㄱ' type shape, a height of 1.0m, and a length of 0.5m when they are installed on the structure gauge for the train.
Keywords
Low height noise barriers installed adjacent to rail; Boundary element method (BEM); Insertion loss (IL); impedance;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 J.T. Kim, Y.H. Hong (2007) Installation effect on noise reducer for railway traffic noise, Journal of the Korean Society for railway, 10(3), pp. 278-283.
2 www.tuxbel.eu, www.zbloc-international.com, www.forster.at (Accessed 8 April 2016).
3 Alexandre Jolibois (2014) A study on the acoustic performance of tramway low height noise barriers : gradient-based numerical optimization and experimental approaches, PhD Thesis, Paris-EST University.
4 J.K. Lee (1993) Fundamentals and applications of Acoustic BEM, The Korean Society for Noise and Vibration Engineering, pp. 85-108.
5 www.openbem.dk (Accessed 2 April 2014).
6 KRNoise (2013) V1.4 Manual, Korea Rail Network Authority.
7 H. Utsuno, T. Tanaka, T. Fujikawa, A.F. Seybert (1989) Transfer function method for measuring characteristic impedance and propagation constant of porous materials, Journal of Acoustical Society of America, 86(2), pp. 637-643.   DOI
8 M.E. Delany, E.N. Bazley (1970) Acoustical properties of fibrous absorbent materials, Applied Acoustics, 3, pp. 105-116.   DOI
9 J.W. Yoon, K.S. Jang, Y.T. Cho (2016) Acoustic performance evaluation and prediction for low height noise barriers installed adjacent to rails using scale down model, Journal of the Korean Society for railway, 19(2), pp. 124-134.   DOI
10 M. Garai, F. Pompoli (2005) A simple empirical model of polyester fibre materials for acoustical application, Applied Acoustics, 66, pp. 1383-1398.   DOI
11 ISO 9613-2 (1996) Acoustics - Attenuation of sound during propagation outdoors - Part 2 : General method of calculation.
12 Ulrich J. Kurze (1974) Noise reduction by barrier, Journal of the Acoustical Society of America, 55(5), pp. 504-519.   DOI
13 Y. Ogata, K. Nagakura (2012) Noise reduction effect of low barriers installed adjacent to rails, QR of RTRI, 53(3), pp. 173-179.   DOI