| 许荣均,林太山,王瑜评,胡秀兰,王聪贵,胡佩仪,杨炽宗,刘法亲,吴阜龙.高速公路高架段桥下反射声识别及改善措施[J].声学技术,2017,36(3):276~280 |
| 高速公路高架段桥下反射声识别及改善措施 |
| Identification and improvement of reflected sound field under the elevated sections of a freeway |
| 投稿时间：2017-02-14 修订日期：2017-04-18 |
| DOI：10.16300/j.cnki.1000-3630.2017.03.014 |
| 中文关键词: 反射面 声源鉴别 反射声 吸声性能 |
| 英文关键词: reflection surface sound source identification reflecting sound absorbing performance |
| 基金项目: |
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| 中文摘要: |
| 台湾因为中山高速公路承载量逐年不足，拟通过兴建汐五高架来解决交通拥堵问题。该工程虽然有效地解决了交通拥堵问题，但高架桥的桥腹反而变成了平面路段交通噪声的反射面，使当地原有噪声问题更加严重。文章通过声源识别技术取得现场不同声源的贡献量，其中以反射声为环境噪声的主要增量来源。基于前述声源识别结果，针对桥底反射声设计了不同几何形状的桥底吸声装置（W型以及倒N型吸声装置），两种桥底吸声装置的声学检测结果显示，W型以及倒N型吸声装置的斜入射吸声性能较平面型吸声板好。另外依据实测成果可知，进行大型工程的噪声改善前，通过声源识别技术区分出主要和次要噪声源，并针对噪声源提出最佳的改善方案，可大幅提升改善工程的效益。 |
| 英文摘要: |
| In order to enhance the carrying capacity of Zhongshan freeway,Taiwan had construct elevated freeway sections from Xizhi to Wugu.Although the project effectively solved the traffic congestions,the bottom portion of the bridges became noise reflecting surfaces and resulted in a much more severe noise problem.In this paper,the sound source identification technology using acoustic camera has been used,and the contribution of different sources of sound has been identified.The result indicates that the reflecting portion of noise is the primary source of the traffic noise.Based on this result,this paper designed two sound-absorbing devices with different geometry (W and N type) for bridge bottom surface,and from the test results,it was confirmed that the absorption coefficients for oblique incidence of these two types of devices are better than the plane surface type.In addition,it is suggested that the sound source identification technique be used to locate primary noise sources before large-scale noise abatement projects initiates,and thus optimal noise reduction methods can be proposed,and therefore greatly enhance the benefit of noise abatement projects. |
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