Nonlinear sound absorption of Helmholtz resonators with serrated necks under high-amplitude sound wave excitation

Zhu, Junzhe; Qu, Yegao; Gao, Hao; Meng, Guang

doi:10.1016/j.jsv.2022.117197

Cited by 14 publications

(3 citation statements)

References 39 publications

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“…In practice, coupled Helmholtz resonators are applicable to broaden the effective noise damping range. 126,130 In this work, we conduct a brief overview of the design and the evolution of coupled Helmholtz resonators. Helmholtz resonator design and optimization can be achieved by two typical approaches.…”

Section: Discussionmentioning

confidence: 99%

Case studies on aeroacoustics damping performances of Coupled Helmholtz Resonators over low frequency ranges

Zhang

Win

2022

Journal of Low Frequency Noise, Vibration and Active Control

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Helmholtz resonators are widely applied in industries to reduce the transmission of unwanted noise and passively attenuate tonal noise in pipes/ducts. For example, internal combustion engines take advantage of Helmholtz resonators by combining air box, subwoofers and perforated pipes/plates to reduce engine noise emission nowadays. However, the main drawback of the conventional Helmholtz resonators includes a very narrow bandwidth. To broaden the effective noise damping frequency range of Helmholtz resonators, a number of different improved designs are reported and tested recently in the literature such as applying an array of separated resonators or implementing mechanical-coupled Helmholtz resonators. In this work, we conduct a brief review on the aeroacoustics damping performance of coupled Helmholtz resonators over low frequency range. The noise damping performances could be characterized and quantified in terms of transmission loss and sound absorption coefficient. Both definitions are discussed. Comparison is then made between the separately working resonators and the mechanical-coupled ones. This is achieved by replacing the sharable flexible sidewall with a rigid sidewall. The effect of the mean grazing flow is also discussed and examined on the noise damping performances. An experimental case study of the present authors is included. Additionally, to improve the noise damping performance further, an overview of the resonators neck with different noise damping materials inserted is conducted. Finally, 3D numerical approaches in simulating the aeroacoustics damping performances of coupled Helmholtz resonators are reviewed. This case study and brief overview provides a guidance on improving the design of coupled Helmholtz resonators and an array of Helmholtz resonators.

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Section: Discussionmentioning

confidence: 99%

Case studies on aeroacoustics damping performances of Coupled Helmholtz Resonators over low frequency ranges

Zhang

Win

2022

Journal of Low Frequency Noise, Vibration and Active Control

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“…1(b) can be expressed by Eqs. (10), (11), (12). Where p N , u N and p neck , u neck are the acoustic pressures and particle velocities at the input and output end of the additional neck, respectively.…”

Section: Theoretical Model For the Hr With Sbh Neckmentioning

confidence: 99%

“…Huang et al 9 further demonstrated that a HR with an extended neck in a cavity can obtain perfect absorption performance. Zhu et al 10 showed that the HR with a serrated neck can obtain a better sound absorption performance than that of the traditional HR under a high-intensity sound excitation. Selamet et al 11 investigated the physical parameters of fibrous materials in the HR cavity effect on the resonance frequencies and the transmission loss properties of the HR.…”

Section: Introductionmentioning

confidence: 99%

Helmholtz Resonator with Sonic Black Hole Neck

Peng,

Mao

2023

The International Journal of Acoustics and Vibration

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The acoustic performance of a Helmholtz resonator (HR) with a sonic black hole (SBH) neck is investigated in this study both theoretically and experimentally. The proposed SBH neck for a HR consists of a cylindrical tube with a set of rigid thin rings. When the inner radius of the ring is linearly decaying, the SBH effect can be obtained. The sound absorption performance of the proposed HR is then derived based on the transfer matrix method (TMM). Finally, the proposed HRs under different sizes are fabricated by a 3D printing apparatus. The analytical acoustic absorption results are compared to the experimental data obtained from an impedance tube setup. The absorption coefficients from TMM and experiments show a reasonable agreement. When compared to the traditional HR, he main advantage of the proposed HR with a SBH neck is that the broadband sound absorption in a non-HR-resonance frequency range can be achieved.

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Ultra-Low-Frequency Broadband Sound Absorption Characteristics of an Acoustic Metasurface with Pie-Sliced Unit Cells

et al. 2023

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Nonlinear sound absorption of Helmholtz resonators with serrated necks under high-amplitude sound wave excitation

Cited by 14 publications

References 39 publications

Case studies on aeroacoustics damping performances of Coupled Helmholtz Resonators over low frequency ranges

Case studies on aeroacoustics damping performances of Coupled Helmholtz Resonators over low frequency ranges

Helmholtz Resonator with Sonic Black Hole Neck

Ultra-Low-Frequency Broadband Sound Absorption Characteristics of an Acoustic Metasurface with Pie-Sliced Unit Cells

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