【摘要】 基于局域共振理论与管道消声理论，设计了一种变截面消声管道耦合Helmholtz谐振腔的声学超材料结构，并运用COMSOL软件进行仿真研究.在此基础上，探讨了变截面声学超材料结构的几何参数对吸声系数峰值的影响，运用声学试验测试了该声学超材料结构的声学性能.结果表明：该变截面声学超材料结构在低频范围(200～600 Hz)内可实现良好的吸声效果；通过改变管道小孔的截面半径，可以实现声学超材料结构固有频率的定向调节；与普通Helmholtz腔相比，该声学超材料结构的吸声系数峰可在一定低频范围内移动，提高了结构在低频范围内的吸声效果，拓宽了吸声系数峰值对应频率的范围；声学超材料结构的几何参数得到了优化，具有良好的吸声效果.更多还原

【Abstract】 Based on the local resonance and pipe silencing theories, an acoustic metamaterial structure with variable cross-section Helmholtz cavity was designed. The acoustic properties of the metamaterials were investigated by COMSOL simulation software. The effect of the geometric parameters of the acoustic metamaterial with variable cross-section on the coefficient peak was discussed, and the acoustic properties were determined by acoustic experiments. The results show that the acoustic structure with variable cross-section structure can realize satisfactory sound absorption effect in the low frequency range of 200-600 Hz. Changing the cross-sectional gradient of pipe holes can realize the directional adjustment of the natural frequency of acoustic structure. Compared with ordinary Helmholtz resonator, the sound absorption coefficient peak of the proposed acoustic structure can move within a certain low frequency range, and the sound absorption effect is improved in the low frequency range with widened frequency range corresponding to the sound absorption coefficient. The geometric parameters of the acoustic metamaterial structure are optimized with good sound absorption effect.更多还原