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蜂窝状声子晶体带隙特性及隔振性能
作者:贺子厚 赵静波   蒋娟娜     
单位:(空军工程大学 西安710051) 
关键词:声子晶体 局域共振 带隙机理 有限元法 隔振性能 
分类号:O734
出版年,卷(期):页码:2019,47(7):0-0
DOI:
摘要:

 设计了一种蜂窝结构声子晶体。用有限元法进行了分析,计算其能带结构图,分析几种振动模式,并阐明带隙机理;针对第一带隙和截止频率的振动模式分别建立等效模型;通过计算不同结构参数的晶体结构的能带图探讨了结构参数对带隙的影响,同时验证了等效模型的合理性,并给出了频率传递曲线。结果表明:该结构为局部共振声子晶体,在36.27~246.91 Hz频率范围内存在1个较宽的带隙。通过改变结构参数,可以进一步拓宽结构带隙,并且降低带隙频率。通过优化结构,当频率包含在间隙范围内时,可以实现121.86 dB的振动衰减。研究结果为声子晶体结构的设计提供了参考。

  A kind of honeycomb structure phononic crystal was designed, and analyzed by finite element method. Its band structure diagram was calculated, and several vibration modes were analyzed to elucidate the bandgaps mechanism. Equivalent models were established for the vibration modes of the first bandgap and the cut-off frequency, respectively. The effect of structural parameters on the bandgap was investigated though calculating the energy band diagrams of crystal structures with different structural parameters,and the rationality of the equivalent model was verified, and the frequency transmission curves were obtained. The result shows that the structure is a locally resonant phononic crystal, and there is a wide bandgap in a frequency range of 36.27?246.91 Hz. By changing the structure parameters, we can further widen the bandgap and bring down the bandgap frequency. The vibration attenuation of 121.86 dB can be achieved when the frequency is contained in the gap range for optimizing the structure. The results obtained could provide a reference for the design of phononic crystal structures.

 
基金项目:
国家自然科学基金项目(11504429)。
作者简介:
参考文献:

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