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Acoustic properties of variable cross-section silencing pipe coupled with Helmholtz cavity structure |
WU Weiguo, BI Jianan, WEI Wei |
School of Civil and Mechanics Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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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.
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Received: 10 December 2021
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