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Abstract To study the influence of sound barriers with different heights on the noise reduction effect, a noise reduction model of sound barrier for high-speed railway was established. Based on a certain section of Wuhan-Guangzhou high-speed railway, the noise reduction effects of the vertical noise barriers with different heights and conditions were simulated and analysed by the software ANSYS and SYSNOISE. Results showed that, the working efficiency of the sound barrier decreased with the increase of the train speed. And under the same speed, the noise reduction effect of the ground noise barrier is more satisfactory than the bridge barrier. Data according to MATLAB numerical calculation showed that the insertion loss of each observation point is a logarithmic formula of the height. The relationship between noise attenuation and the height of barrier was not a linear one, the growth rate of the insertion loss was smaller as the height increased on the same scale. According to the need of noise reduction and the economics, the suitable height of the subgrade sound barrier is 3.45~3.95m. And when the train runs at a high speed above 350km/h, the suitable height of the bridge sound barrier should be more than 3.15m.
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Received: 21 October 2014
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