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| Dual-channel broadband noise suppression method based on double-layer anti-symmetric damping phononic crystals |
| BAI Xiaotian1, XIAO Zhaoyang1, SHI Huaitao1, LUO Zhong2, ZHAO Jinbao1, HE Fengxia1 |
| 1.School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang 110168, China;
2.MOE Key Lab for Vibration and Control of Aero-Propulsion System, Northeastern University, Shenyang 110819, China |
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Abstract The paper proposes a solution to the problem of insufficient noise reduction bandwidth in both structural and air propagation pathways, which cannot be applied to existing engineering equipment with wide band sound radiation. A double-layer anti-symmetric damping phononic crystal is introduced in this paper, with the double-layer damping phononic crystals as the unit cell, and two identical unit cells are arranged in antisymmetric manner to achieve a weak coupling effect while controlling the transmission of forward and backward sound waves to improve noise reduction. The finite element method and force-sound analogy method are used to calculate the energy band diagram, transmission curve and sound absorption coefficient of this structure, and comparative analyses are carried out on the differences in sound absorption performance between the proposed structure and traditional structure. Then the results are validated through experiments. Results show that the double-layer anti-symmetric damping phononic crystal effectively controls structural noise, the noise reduction bandwidth is expanded to 3.3 times that of traditional structures, with the additional mass of only 53.3% compared to traditional phononic crystals while maintaining the same volume. For the noise transmission through the air, the anti-symmetric structure shows excellent noise reduction performance by achieving a high sound absorption coefficient. The results indicate that this model can realize dual channel noise control over a wide frequency range and has the advantage of lightweight, which effectively supplement the shortcomings in broadband noise control in existing models.
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Received: 07 October 2023
Published: 15 June 2024
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