| 吸声型声屏障的频率特性对降噪的贡献研究 |
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| 引用本文： | 罗文俊,陈靖. 吸声型声屏障的频率特性对降噪的贡献研究[J]. 城市轨道交通研究, 2017, 20(8). DOI: 10.16037/j.1007-869x.2017.08.037 |
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| 作者姓名： | 罗文俊 陈靖 |
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| 作者单位： | 华东交通大学铁路环境振动与噪声教育部工程研究中心,330013,南昌 |
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| 基金项目： | 国家自然科学基金项目，江西省青年基金重点项目，江西省自然科学基金项目，江西省杰出青年人才资助计划项目 |
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| 摘 要： | 针对目前吸声型声屏障仅用平均吸声系数作为评价吸声性能指标的缺点,结合多种吸声材料,给出了两个不同路段的噪声频谱计算结果,分析了吸声型屏障各频程吸声系数对整体吸声降噪的贡献,得出了各频程吸声系数的改变对整体降噪的影响程度依赖于路段的噪声频谱分布情况的结论。
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| 关 键 词： | 铁道噪声 吸声屏障 吸声降噪量 吸声系数 频率特性 |
Contribution of Frequency Characteristics of Sound Ab-sorption Barrier to Noise Reduction |
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| LUO Wenjun,CHEN Jing. Contribution of Frequency Characteristics of Sound Ab-sorption Barrier to Noise Reduction[J]. Urban Mass Transit, 2017, 20(8). DOI: 10.16037/j.1007-869x.2017.08.037 |
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| Authors: | LUO Wenjun CHEN Jing |
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| Abstract: | So far the average sound absorption coefficient is taken as the only evaluation index for sound absorption bar-rier,in view of this problem,and combined with a variety of sound absorption materials,the results of noise spectrum cal-culation in two different line sections are given. On this ba-sis,the contribution of absorption coefficient at various fre-quencies to the overall sound absorption and noise reduction is analyzed,the distribution of noise spectrum in different line sections is detected as the main cause for the changes of absorption coefficient. |
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| Keywords: | railway noise sound absorption barrier noise reduction sound absorption coefficient frequency character-istics |
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