Study on Band Gap and Sound Insulation Characteristics of an Adjustable Helmholtz Resonator

Han, Dong-Hai; Zhang, Guangjun; Zhao, Jing-Bo; Ye, Hong; Liu, Hong

doi:10.3390/app12094512

Cited by 9 publications

(3 citation statements)

References 23 publications

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“…In order to obtain the desired sound absorption performance, it is essential to adjust structural parameters of the acoustic metamaterial [ 15 , 16 , 17 , 18 , 19 ]. Li et al [ 15 ] had proposed the composite structure composed of porous-material layer mosaicked with a perforated resonator and its structural parameters were optimized to enhance the low-frequency sound absorption of the porous layer.…”

Section: Introductionmentioning

confidence: 99%

“…Ciaburro et al [ 17 ] proposed a novel layered membrane metamaterial based on three layers of the reused PVC membranes and a reused metal washer, and different configurations were analyzed by changing the number of masses attached to each layer and the geometry of their position. A Helmholtz-type phononic crystal with adjustable cavity structure and labyrinth tubes was designed by Han et al [ 18 ], and multiple resonant band gaps could be connected by adjusting the structural layout of the cavity through the telescopic screw, so as to achieve the purpose of widening the band gap and the active control of environmental noise. Wang et al [ 19 ] had developed an acoustic metamaterial absorber of parallel-connection square Helmholtz resonators, and the average actual sound absorption coefficients of these three optimized metamaterial cells were 0.9271 in the [700 Hz, 1000 Hz] with a total size of 30 mm, 0.9157 in the [600 Hz, 900 Hz] with a total size of 40 mm, and 0.9259 in the [500 Hz, 800 Hz] with a total size of 50 mm, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Development of Adjustable Parallel Helmholtz Acoustic Metamaterial for Broad Low-Frequency Sound Absorption Band

Yang

Shen

et al. 2022

Materials

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For the common difficulties of noise control in a low frequency region, an adjustable parallel Helmholtz acoustic metamaterial (APH-AM) was developed to gain broad sound absorption band by introducing multiple resonant chambers to enlarge the absorption bandwidth and tuning length of rear cavity for each chamber. Based on the coupling analysis of double resonators, the generation mechanism of broad sound absorption by adjusting the structural parameters was analyzed, which provided a foundation for the development of APH-AM with tunable chambers. Different from other optimization designs by theoretical modeling or finite element simulation, the adjustment of sound absorption performance for the proposed APH-AM could be directly conducted in transfer function tube measurement by changing the length of rear cavity for each chamber. According to optimization process of APH-AM, The target for all sound absorption coefficients above 0.9 was achieved in 602–1287 Hz with normal incidence and that for all sound absorption coefficients above 0.85 was obtained in 618–1482 Hz. The distributions of sound pressure for peak absorption frequency points were obtained in the finite element simulation, which could exhibit its sound absorption mechanism. Meanwhile, the sound absorption performance of the APH-AM with larger length of the aperture and that with smaller diameter of the aperture were discussed by finite element simulation, which could further show the potential of APH-AM in the low-frequency sound absorption. The proposed APH-AM could improve efficiency and accuracy in adjusting sound absorption performance purposefully, which would promote its practical application in low-frequency noise control.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of Adjustable Parallel Helmholtz Acoustic Metamaterial for Broad Low-Frequency Sound Absorption Band

Yang

Shen

et al. 2022

Materials

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“…[ 19,20 ] The phonon crystals obtained by the above principle are characterized by a wide bandgap, but it is difficult to produce a bandgap at lower frequencies, which is a common feature of phonon crystals designed by the Bragg scattering theory. [ 21 ] It was not until Liu et al [ 22 ] used a soft elastic material wrapped around a lead mass block to form a 3D local resonant phonon crystal that the control of large wavelengths by a small size structure was truly achieved, providing a completely new idea for low‐frequency wave control and interference. The proposal of two types of phononic crystals has led to a broader design idea and wider application field of structures, and gradually a number of acoustic metamaterials with multifunctional features have enthusiastically emerged: Helmholtz resonant metamaterials, [ 23 ] membrane‐type metamaterials, [ 24,25 ] quasi‐zero rigidity metamaterials, [ 26–28 ] etc.…”

Section: Introductionmentioning

confidence: 99%

Low‐Frequency Vibration and Noise Reduction and Wave Propagation Properties of Hexagonal Hybrid Metamaterials with Local Resonance Strips

Cao

Yang

et al. 2023

Physica Status Solidi (b)

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Based on the idea of local resonance, a class of hybrid acoustic metamaterials with interposed resonant strips is proposed in this article, and the bandgap characteristics and transmission properties are calculated by combining Bloch's theorem and lattice theory. The new structure is verified to have low‐frequency damping and noise reduction capability through the analysis of the stress cloud diagram at specific frequencies in the bandgap range. A comprehensive analysis of vibration modes, phase constant surfaces, group velocity, phase velocity, and wave propagation direction diagram is used to explore the wave propagation and bandgap opening mechanism, providing technical support and theoretical basis for subsequent bandgap optimization and structural improvement. The results show that this structure can open multiple bandgaps in the low‐frequency range below 500 Hz, and the stepped design of the single‐cell structure and the introduction of resonant strips provide a new design idea for low‐frequency vibration and noise reduction.

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Low-frequency bandgap and vibration suppression mechanism of a novel square hierarchical honeycomb metamaterial

Dong,

Wang,

Wang

et al. 2024

Appl. Math. Mech.-Engl. Ed.

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The suppression of low-frequency vibration and noise has always been an important issue in a wide range of engineering applications. To address this concern, a novel square hierarchical honeycomb metamaterial capable of reducing low-frequency noise has been developed. By combining Bloch’s theorem with the finite element method, the band structure is calculated. Numerical results indicate that this metamaterial can produce multiple low-frequency bandgaps within 500 Hz, with a bandgap ratio exceeding 50%. The first bandgap spans from 169.57 Hz to 216.42 Hz. To reveal the formation mechanism of the bandgap, a vibrational mode analysis is performed. Numerical analysis demonstrates that the bandgap is attributed to the suppression of elastic wave propagation by the vibrations of the structure’s two protruding corners and overall expansion vibrations. Additionally, detailed parametric analyses are conducted to investigate the effect of θ, i.e., the angle between the protruding corner of the structure and the horizontal direction, on the band structures and the total effective bandgap width. It is found that reducing θ is conducive to obtaining lower frequency bandgaps. The propagation characteristics of elastic waves in the structure are explored by the group velocity, phase velocity, and wave propagation direction. Finally, the transmission characteristics of a finite periodic structure are investigated experimentally. The results indicate significant acceleration amplitude attenuation within the bandgap range, confirming the structure’s excellent low-frequency vibration suppression capability.

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Study on Band Gap and Sound Insulation Characteristics of an Adjustable Helmholtz Resonator

Cited by 9 publications

References 23 publications

Development of Adjustable Parallel Helmholtz Acoustic Metamaterial for Broad Low-Frequency Sound Absorption Band

Development of Adjustable Parallel Helmholtz Acoustic Metamaterial for Broad Low-Frequency Sound Absorption Band

Low‐Frequency Vibration and Noise Reduction and Wave Propagation Properties of Hexagonal Hybrid Metamaterials with Local Resonance Strips

Low-frequency bandgap and vibration suppression mechanism of a novel square hierarchical honeycomb metamaterial

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