| 引用本文: | 侯九霄,朱海潮,毛荣富,等.柔性背腔鼓型消声器声学特性分析.[J].国防科技大学学报,2019,41(6):75-82.[点击复制] |
| HOU Jiuxiao,ZHU Haichao,MAO Rongfu,et al.Acoustic characteristic of drum-like silencer with flexible back cavity[J].Journal of National University of Defense Technology,2019,41(6):75-82[点击复制] |
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| 柔性背腔鼓型消声器声学特性分析 |
| 侯九霄,朱海潮,毛荣富,袁苏伟 |
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(海军工程大学 船舶振动噪声重点实验室, 湖北 武汉 430033)
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| 摘要: |
| 现有的鼓型消声器由具有刚性背腔的膨胀腔和张紧的薄膜构成,利用薄膜的振动辐射声场与原声场叠加作用,使得透射过消声器的声能减少,达到消声的目的。为使消声器兼具隔振作用,提出了新型柔性背腔鼓型消声器,基于Fourier-Galerkin方法建立其声学理论模型,将传递损失特性与现有的刚性背腔模型进行比较,进一步研究柔性背腔鼓形消声器的消声机理,并分析了背腔参数对性能的影响。计算结果表明,柔性背腔有效提高了消声器低频消声效果,较相同结构尺寸条件下的刚性背腔消声器,显著拓宽了有效消声带宽。 |
| 关键词: 柔性背腔 鼓型消声器 传递损失 Fourier-Galerkin方法 |
| DOI：10.11887/j.cn.201906012 |
| 投稿日期：2018-07-21 |
| 基金项目:国家自然科学基金资助项目(51675529) |
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| Acoustic characteristic of drum-like silencer with flexible back cavity |
| HOU Jiuxiao, ZHU Haichao, MAO Rongfu, YUAN Suwei |
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(National Key Laboratory on Ship Vibration & Noise, Naval University of Engineering, Wuhan 430033, China)
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| Abstract: |
| The existed drum-like silencer usually consists of expansion chamber with RBC (rigid back cavity) and tensioned membrane. With the effect of vibration radiation of the membrane, the transmitted acoustic energy can be reduced. In order to enable the silencer with ability of vibration isolation, a new type of silencer with FBC (flexible back cavity) was presented. The acoustic theoretical model was established using Fourier-Galerkin method. Then, the TL (transmission loss) characteristic was compared with the RBC model. Further, the silencing mechanism of the FBC silencer was studied, and the influence of the FBC parameters on the performance was also analyzed. Results indicate that the proposed FBC silencer has a better performance in low frequency. Compared with the RBC silencer having the same structural size, it can greatly improve the acoustic absorption band can be improved. |
| Keywords: flexible back cavity drum-like silencer transmission loss Fourier-Galerkin method |
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