声传播与膜式穿孔管结构耦合分析
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1.中北大学机械工程学院 太原 030051;2.中北大学软件学院 太原&3.amp;4.#160;5.030051

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O429

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Coupling analysis between sound propagation and membrane perforated tube structure
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North University of China

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    摘要:

    针对低频宽带噪声所设计的消声器结构尺寸较大且消声效果较差的问题,膜结构对低频噪声具有良好的消声性能,以及穿孔管的宽带消声特性,结合两者的优点,提出了穿孔管与超材料薄膜耦合结构。首先搭建膜式穿孔管结构并通过理论分析膜片的振动方程,进一步探究了关键参数对耦合结构的传递损失幅值和频率的影响规律,结果表明:管内声波和膜片谐振系统的耦合强度越高,膜片的振动响应越剧烈,声波反射的程度越大,流入下游管道的声能量越少,同时声传递损失尖峰对应频率与超材料薄膜密切相关。最后设计了螺旋型耦合结构,通过仿真与实验测试该结构的消声特性,结果吻合较好,为低频宽带噪声控制领域提供理论依据。

    Abstract:

    In order to solve the problem that the muffler designed for low frequency wideband noise has a large size and poor sound attenuation effect, the membrane structure has a good noise attenuation performance for low frequency noise, and the perforated pipe has a wide band noise attenuation characteristic.First set up film type perforated pipe structure and through the theoretical analysis of the vibration equation of the diaphragm, further explores the key parameters on the coupling structure of transmission loss law of the influence of amplitude and frequency, the results showed that tube waves and resonance system of diaphragm coupling strength is higher, the vibration response of the diaphragm, the more intense, the greater the degree of acoustic reflection, the less sound energy flow into the downstream piping, at the same time sound transmission loss peak corresponds to the frequency and ultra thin film materials are closely related.Finally, the helical coupling structure is designed, and the noise reduction characteristics of the structure are tested by simulation and experiment.

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陈龙虎†,郭俊娜. 声传播与膜式穿孔管结构耦合分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2020-07-01
  • 最后修改日期:2020-08-10
  • 录用日期:2020-08-10
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