The geometrical shapes of sound barriers have an effect on high-speed railway external noise. In order to make clear the noise reduction mechanism and effect of the sound barrier with different geometric head shape, the two-dimension(2D) boundary element method(BEM) is used to develop a noise prediction model for railway noise barrier. Using the model，the structure parameters of the different sound barriers are investigated and their noise reduction performance is analyzed. With taking into account the influence of train speed, sound sources distribution and their frequency characteristics on insertion loss(IL), the sound source model of high-speed railway is developed according to the external noise source identification results. A BEM calculation model is developed on through sufficient considering the multiple reflections among train body, track and sound barrier. The noise reduction effects of sound barriers with sloping top, T-shaped top, multiple diffraction edges, Y-shaped top and cylinder-shaped top are surveyed. In the discussion, the changes of IL, frequency spectrum of field points and sound field are given. It’s shown that the noise reduction effect of Y-shaped sound barrier is the best and the average IL is improved 3.4 dB(A), secondly is the cylinder-shaped sound barrier.
HE Bin
,
XIAO Xinbiao
,
ZHOU Xin
,
WEN Zefeng
,
JIN Xuesong
. Numerical Study on Acoustic Performance of High-speed Railway Noise Barriers with Different Geometric Shape[J]. Journal of Mechanical Engineering, 2016
, 52(2)
: 99
-107
.
DOI: 10.3901/JME.2016.02.099
[1] THOMPSON D J. Railway noise and vibration [M]. New York：Elsevier，2009.
[2] 周信，肖新标，何宾，等. 高速铁路声屏障降噪效果预测及其验证[J]. 机械工程学报，2013，49(10)：14-19. ZHOU Xin，XIAO Xinbiao，HE Bin，et al. Numerical model for predicting the noise reduction of noise barrier of high speed railway and its test validation[J]. Journal of Mechanical Engineering，2013，49(10)：14-19.
[3] EKICI I，BOUGDAH H. A review of research on environmental noise barriers[J]. Building Acoustics，2003，10 (4)：289-323.
[4] CROMBIE D H，HOTHERSALL D C，CHANDLER W S N. Multiple-edge noise barriers[J]. Applied Acoustics，1995，44(4)：353-367.
[5] DUHAMEL D. Efficient calculation of the three-dimensional sound pressure field around a noise barrier[J]. Journal of Sound and Vibration，1996，197(5)：547-571.
[6] WATTS G R，MORGAN P A. Acoustic performance of an interference-type noise-barrier profile[J]. Applied Acoustics，1996，49(1)：1-16.
[7] ISHIZUKA T，FUJIWARA K. Performance of noise barriers with variable edge shape and acoustical conditions[J]. Applied Acoustics，2004，65：125-141.
[8] MALCOLM J C. Handbook of noise and vibration control[M]. New Jersey：John Wiley & Sons，Inc.，2007.
[9] HE Bin，XIAO Xinbiao，ZHOU Qiang，et al. Investigation into external noise of a high-speed train at different speeds[J]. Journal of Zhejiang University-SCIENCE A(Applied Physics & Engineering)，2014，15(12)：1019-1033.
[10] MORGAN P A，HOTHERSALL D C. Influence of shape and absorbing surface—a numerical study of railway noise barriers[J]. Journal of Sound and Vibration，1998，217(3)：405-417.
[11] BELINGARD P，POISSON F，BELLAJ S. Experimental study of noise barriers for high-speed trains[C]//Proceedings of the 9th International Workshop on Railway Noise. Munich：Springer，2007：495-503.
[12] MURATA K，NAGAKURA K，KITAGAWA T，et al. Noise reduction effect of noise barrier for Shinkansen based on Y-shaped structure[J]. Quarterly Report of RTR1，2006，47(3)：162-168.
[13] MELLETA C，LETOURNEAU F，POISSON F，et al. High speed train noise emission：Latest investigation of the aerodynamic/rolling noise contribution[J]. Journal of Sound and Vibration，2006，293(3)：535-546.
[14] HEMSWORTH B. Prediction of train noise[M]. London：Butterworth，1987.
[15] FELDMANN J. The noise behaviour of the wheel/rail system-some supplementary results[J]. Journal of Sound and Vibration，1983，87(3)：179-187.
[16] ÖAL-RICHTLINIE. Calculation of the sound emission from rail traffic[R]. Vienna：VTI，1990.
[17] HOTHERSALL D C，CHANDLER-WILDE S N，HAJMIRZAE M N. Efficiency of single noise barriers[J]. Journal of Sound and Vibration，1991，115(4)：303-322.
[18] OKUBO T，FUJIWARA K. Efficiency of a noise barrier on the ground with an acoustically soft cylindrical edge[J]. Journal of Sound and Vibration，1998，216(5)：771-790.
