| 朱庆,白鸿柏,路纯红.金属片镶嵌微缝薄膜结构的吸声特性分析*[J].,2016,35(5):457-463 |
| 金属片镶嵌微缝薄膜结构的吸声特性分析* |
| Sound absorption property about the metal strip of distribution in microslit membrane |
| 投稿时间：2015-12-08 修订日期：2016-08-11 |
| 中文摘要: |
| 为了使声波在低声压级、低频带达到理想的吸收效果,提出了金属片镶嵌微缝薄膜结构理论模型,分析了该模型的吸声机理。把该结构的力学模型看作多自由度系统,构建振动微分方程,得到了金属片镶嵌薄膜的分布位置与每段薄膜弹性系数之间的关系。并在此基础上分析了激励频率与固有频率之间的关系,得出基频对该结构吸声效果的影响。利用有限元软件对该结构的模态振型和声阻抗率进行了分析,得到了镶嵌在微缝薄膜上的金属片与声波的耦合形式。最后通过试验对该结构的吸声特性验证。 |
| 英文摘要: |
| To realize the ideal absorption effect about low-decibel and low frequency band, the theory model about the metal strip of distribution in microslit membrane structure is established, the sound absorption mechanism of the model is analyzed. The force model of the structure regards as the system of multi degree-of-freedom, and the vibration differential equation is established, the relationship between the distribution location of the metal strip membrane and the part of membrane elasticity coefficient is obtained. The relationship between exciting frequency and natural frequency is analyzed, the influence of the structure absorption effect due to fundamental frequency is obtained. The modal shapes and acoustic impedance of the structure are analyzed by finite element method(FEM), the interaction relationship between the metal strip of distribution in microslit membrane and sound wave is obtained. The sound absorption property of the structure are tested by experiment. |
| DOI：10.11684/j.issn.1000-310X.2016.05.011 |
| 中文关键词: 金属片 微缝薄膜 吸声机理 多自由度 模态振型 吸声系数 |
| 英文关键词: metal strip microslit membrane sound absorption mechanism multi degree-of-freedom model shapes absorption coefficient |
| 基金项目:武器装备“十二五”预先研究项目 |
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