噪声与振动控制Issue(4)：44-47,61,5.DOI:10.3969/j.issn.1006-1335.2014.04.010
V型声屏障隔声性能测试及降噪效果预测
Experimental Study on the Sound Insulation Performance and Noise Reduction Effect Prediction of V-type Noise Barriers
摘要
Abstract
To evaluating the noise reduction effect of the V-shaped noise barriers, their sound insulation performance is studied by combining experiment method with numerical prediction. First of all, the insulation of V-type noise barrier is measured in the lab. The result shows that the weighted sound insulation of the V-type barrier is 23.8 dB smaller than that of the vertical sound barrier, which means that its performance is poor. But high-speed trains have their own source intensity distribution characteristics. In order to predict the actual in-situ noise reduction effect of the V-shaped noise barrier, the spatial distribution characteristic of the sound sources of the traveling high speed train is identified by measurement. On this basis the model for prediction is established. The sound insulation effect of the barrier is predicted and analyzed. The results show that the V-type sound barrier can effectively reduce the exterior noise of the high-speed train, it can approximately reduce the noise by 1 dB(A) in comparison with the vertical barrier. For the sound sources in the wheel-rail area, the V-shaped noise barrier can reduce the noise by 4 dB. And the noise reduction effect is very good at 500 Hz, 1 250 Hz and 2 000 Hz frequencies.关键词
声学/声屏障/隔声测试/预测/降噪效果Key words
acoustics/noise barriers/sound insulation testing/prediction/noise reduction effect分类
数理科学引用本文复制引用
周强,肖新标,何宾,屈磊,金学松..V型声屏障隔声性能测试及降噪效果预测[J].噪声与振动控制,2014,(4):44-47,61,5.基金项目
2012博士创新基金A0920502051214）；国家863计划(2011AA11A103-4-2)；教育部创新团队(IRT1178) （2011AA11A103-4-2）
