| 多带隙联合的声子晶体滤波梁弹性波传播特性 |
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| 引用本文： | 张鑫浩,赵才友,郑钧元,牛亚文,未娜超.多带隙联合的声子晶体滤波梁弹性波传播特性[J].机械科学与技术(西安),2023,42(3):338-344. |
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| 作者姓名： | 张鑫浩 赵才友 郑钧元 牛亚文 未娜超 |
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| 作者单位： | 1.西南交通大学 土木工程学院，成都 610031 |
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| 基金项目： | 国家自然科学基金面上项目（51978585）、高速铁路基础研究联合基金项目（U1734207）及四川省应用基础研究项目（2020YJ0214） |
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| 摘 要： | 提出了一种包含Bragg散射、整体局域共振和局部局域共振机理的多带隙联合声子晶体滤波梁，通过传递矩阵法与Bloch定理求得无限周期结构各阶带隙为0～170 Hz、180～262.6 Hz、552.3～597 Hz、974～1 563 Hz、1 903～2 667 Hz；并调节结构参数，得出带隙调制规律和带隙机理。同时，与其他3种工况声子晶体梁带隙特征进行对比分析，证明了声子晶体滤波梁在带隙宽度、丰富度以及弹性波衰减率方面均有着相对优势，具备更好的过滤或抑制结构中弹性波的性能。此外，求解近声子晶体滤波梁的振动传递系数，得出在各阶带隙范围内，弹性波的传播存在明显衰减，验证了带隙的存在。最后为探究弹性波在带隙/通带范围内的波动模式，分别提取位于带隙/通带范围梁体位移分布，发现在带隙频率范围内的弹性波沿波动方向快速衰减，表现出带隙特性；通带频率范围内的弹性波无明显变化或衰减，表现出通带特性。
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| 关 键 词： | 声子晶体滤波梁 弹性波 带隙联合 振动传递特性 传递矩阵法 |
| 收稿时间： | 2021-05-14 |
Elastic Wave Propagation Characteristics of a Combined Multi Band Gap Phononic Crystal Filter Beam |
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| Affiliation: | 1.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China2.The Ministry of Education Key Laboratory of High Speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China3.Tangshan Institute, Southwest Jiaotong University, Tangshan 063000, Hebei, China |
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| Abstract: | In this paper, a multi-band gap joint phononic crystal filter beam is proposed, which is includes Bragg Diffraction, entire local resonance and partial local resonance. By means of Transfer Matrix and Bloch theorem, it is found that the band gaps of infinite periodic structures are 0 ~ 170 Hz, 180 ~ 262.6 Hz, 552.3 ~ 597 Hz, 974 ~ 1 563 Hz and 1 903 ~ 2 667 Hz. And the modulating law and mechanism of band gap are obtained by changing the structural parameters. At the same time, compared with the band gap characteristics of the traditional three-component and other three working conditions, it is proved that the phononic crystal filter beam has relative advantages in band gap width, richness and elastic wave attenuation rate. That’ to say, phononic crystal filter beam has better performance of filtering and suppressing elastic waves in the structure. In addition, the vibration transfer coefficient of near-phononic crystal filter beam is calculated, and it is concluded that the elastic wave propagation attenuates obviously in the range of each band gap, which verifies the existence of the band gap. In the last part, in order to find out the wave modes of elastic wave in the band gap and in the passband range, the displacement distribution of the beam in band gap and passband range is extracted respectively.From the result, it is found that the elastic wave in band gap frequency range attenuates rapidly along the wave direction, showing the characteristics of band gap. While the elastic wave in the frequency range of passband has no obvious change or attenuation, showing the characteristics of passband. To sum up, this structure provides a new idea and theoretical support for the subsequent apply of phononic crystals to reduce vibration and noise of beam structures. |
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