次级源近场和管壁弹性对充液管路有源消声性能的影响  

Influence of the near field of secondary source and the elasticity of pipe wall on active noise control performance of liquid-filled pipe

作　　者：郭格格 孙红灵[1,2] 孙陆阳 曹晟楠 杨军 GUO Gege;SUN Hongling;SUN Luyang;CAO Shengnan;YANG Jun(Key Laboratory of Noise and Vibration,Institute of Acoustics,Chinese Academy of Sciences, Beijing 100190;University of Chinese Academy of Sciences ,Beijing 100049)

机构地区：[1]中国科学院噪声与振动重点实验室(声学研究所),北京100190 [2]中国科学院大学,北京100049

出　　处：《声学学报》2022年第6期727-738,共12页Acta Acustica

基　　金：国家自然科学基金项目(12004412)资助。

摘　　要：建立了含次级源结构的充液直管有源消声系统数值模型,重点分析了声激励下次级源近场和管壁弹性对有源消声性能的影响。结果表明:次级源近场为非均匀声场,误差点位于该区域时部分频点控制效果较差甚至放大,而处于声场均匀区域时可使降噪量提高10 dB以上,增加误差点数量可使绝大多数频点的降噪量提高5 dB以上;管壁弹性使次级源与管壁间的耦合较强,非对称分布的次级源容易激起管壁振动,导致降噪谷值的出现,采用对称分布的次级源可显著提升控制效果;增加次级源数量能够提高系统的有源无源复合控制效果,但使得管内声场变得复杂,多次级源模型的有源消声效果随频率升高而有所降低。The numerical models of liquid-filled straight pipe system with active silencers are established.The influence of the near field of secondary source in active silencers and the elasticity of pipe wall on active noise control performance under sound excitation is analyzed.The results show that the near field of secondary source is non-uniform,and the active control effect of some frequencies is poor or even the sound pressure level will increase when the error points are located in this region.The noise reduction can be increased by more than 10 dB when the error points are in the region of uniform sound field.The noise reduction of most frequencies can be increased by more than 5 dB by increasing the number of error points.The coupling between secondary source and pipe wall is strong because of the elasticity of pipe wall.Asymmetrically distributed secondary sources tend to excite the pipe wall vibration,which causes the troughs of control effect.The symmetrically distributed secondary sources can significantly improve the control effect.Increasing the number of secondary sources can improve the active-passive hybrid control effect of the system.However,it makes the sound field in the pipe more complex,and the active silencing effect of the models with multiple secondary sources decreases with increasing frequency.

关 键 词：有源消声 非对称分布 复合控制 降噪量 近场 声激励 声场 频点控制 

分 类 号：TB535.2[理学—物理]