为了探究反射体对U型梁贴附式吸声材料插入损失的影响，根据车厢轮廓建立模拟反射体进行实验研究。利用声线理论分析了当反射体存在时，由于中高频噪声经过反射体与吸声材料表面间的多次反射逐渐消耗能量，使插入损失比没有反射体时增大；实验结果表明，对于U型梁外侧的噪声敏感区，反射体存在时的插入损失值明显大于没有反射体时；各测点的1/3倍频程插入损失曲线表明，反射体的存在对中高频段噪声的影响较大，对低频段噪声影响较小。本实验为评价某新研发的贴附式吸声材料在U型梁腹板内侧使用时的实际降噪效果提供参考。
Abstract
In order to investigate effects of reflector on insertion loss of a U-beam’s adhesive sound-absorbing material, an analog reflector was constructed for tests based on the outline of a train car. The test results were analyzed using the sound line theory. It was shown that when a reflector exists, noise within medium and high frequency ranges after repeated reflections between reflector and a U-beam’s adhesive sound-absorbing material gradually dissipates energy, the insertion loss increases; in the noise sensitive area outside the U-beam, the insertion loss during reflector existing is significantly larger than that be during absence of reflector; the 1/3 octave insertion loss curve for each measured point reveals the existence of reflector has a larger influence on noise within medium and high frequency ranges but a less influence on noise within a lower frequency range. This study provided a reference for evaluating the actual noise reduction effect of a certain newly developed adhesive sound-absorbing material used at the inner side of a U-beam’s web.
关键词
U型梁 /
插入损失 /
吸声材料 /
声线法 /
反射体
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Key words
U-beam /
insertion loss /
sound absorbing material /
sound line method /
reflector
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参考文献
[1]王奕然.城市轨道交通高架线U型梁降噪理论与测试.都市快轨交通,2013,26(3):41-44.
Wang Y R. Noise reduction theory and test of viaduct U-beam in urban rail transit. Urban Rapid Rail Transit, 2013, 26(3):41-44.
[2]杨秀仁.城市轨道交通U型梁高架系统关键技术研究及创新.都市快轨交通,2015,28(5):27-30.
Yang X R. Research and innovation on key technologies of U-beam elevated system in urban rail transit. Urban Rapid Rail Transit, 2015, 28(5):27-30.
[3]尹航.U型梁结构噪声及梁体对轮轨噪声的遮蔽效应研究.硕士学位论文.成都：西南交通大学,2011.
Yin H. Studies on U-shaped beam structure noise and shadowing effect on wheel-rail noise .Master Thesis. Chengdu: Southwest Jiao tong University, 2011.
[4]Mellet C, Letourneaux F, Poisson F. High speed train noise emission: latest investigation of the aerodynamic/rolling noise contribution. Journal of Sound and Vibration, 2006, 293:535-546.
[5] Chew C. Directivity of train noise in the vertical plane. Building Acoustics, 1998, 55(3):243-250.
[6] 周信.高速铁路声屏障降噪效果预测及新型声屏障设计.硕士学位论文.成都:西南交通大学,2013.
Zhou X. Noise reduction prediction and design of new type of noise barrier for high-speed Train. Master Thesis. Chengdu: SouthwestJiaotongUniversity, 2013.
[7] 姜长英.城市轻轨车辆车内噪声分布规律及降噪措施研究.硕士学位论文.大连:大连交通大学,2011.
Jiang C J. Noise distributed regular and noise reduction measure research on interior noise of urban light rail vehicles. Dalian: DalianJiaotongUniversity, 2011.
[8] 占智华.地铁车轮振动与声辐射特性研究.硕士学位论文.北京:北京交通大学,2012.
Zhan Z H. Research on the vibration and sound radiation characteristics of the metro wheels, Beijing, BeijingJiaotongUniversity, 2012.
[9] 韩江龙,吴定俊,李奇.城市轨道交通槽型梁结构噪声计算与分析.工程力学,2013,30(2):190-195.
Hang J L, Wu D J, Li Q. Calculation and analysis of structure-borne noise from urban rail transit trough girders. Engineering Mechanics, 2013, 30(2):190-195.
[10] 汤峰.城市轨道交通噪声特性测量分析与治理对策的研究.硕士学位论文.上海:同济大学, 2003.
Tang F. The investigation, Analysis and Study of countermeasures of urban rail traffic noise, Shanghai, TongjiUniversity, 2003.
[11] Thompson D J. A review of the modeling of wheel/rail noise generation. Journal of Sound and Vibration, 2000, 231(3):519-536.
[12] 杜功焕,朱哲民,龚秀芬.声学基础(第三版).南京：南京大学出版社,2012,124-130.
[13] 中华人民共和国国家标准.声学各种户外声屏障插入损失的现场测定.GB/T 19884 - 2005.
State Standard of the People's Republic of China. Acoustic - In-situ determination of insertion loss of outdoor noise barriers of all types.GB/T 19884 - 2005.
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