Research on the Sound Insulation Performance of Composite Rubber Reinforced with Hollow Glass Microsphere Based on Acoustic Finite Element Simulation

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The limited occupied space and various noise spectrum requires an adjustable sound absorber with a smart structure and tunable sound absorption performance. The hexagonal acoustic metamaterial cell of the multiple parallel-connection resonators with tunable perforating rate was proposed in this research, which consisted of six triangular cavities and six trapezium cavities, and the perforation rate of each cavity was adjustable by moving the sliding block along the slideway. The optimal geometric parameters were obtained by the joint optimization of the acoustic finite element simulation and cuckoo search algorithm, and the average sound absorption coefficients in the target frequency ranges of 650–1150 Hz, 700–1200 Hz and 700–1000 Hz were up to 0.8565, 0.8615 and 0.8807, respectively. The experimental sample was fabricated by the fused filament fabrication method, and its sound absorption coefficients were further detected by impedance tube detector. The consistency between simulation data and experimental data proved the accuracy of the acoustic finite element simulation model and the effectiveness of the joint optimization method. The tunable sound absorption performance, outstanding low-frequency noise reduction property, extensible outline structure and efficient space utilization were favorable to promote its practical applications in noise reduction.

Section: Sound Absorption Mechanismmentioning

confidence: 99%

Study on a Hexagonal Acoustic Metamaterial Cell of Multiple Parallel-Connection Resonators with Tunable Perforating Rate

Cheng,

Yang,

Shen

et al. 2023

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“…Thirdly, there have been many studies mainly investigating sound-insulation performance by numerical simulation without any experimental validations [ 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 ]. For example, a versatile and fully coupled technique based on the finite-element–boundary-element model was developed by Sahu et al [ 52 ], and the contributions of the individual components in transmitted energy were identified by numerical simulations.…”

Section: Resultsmentioning

confidence: 99%

“…It was presented by Fan et al [ 53 ] that theoretical analysis and finite element simulation demonstrated that an acoustic metamaterial based on membrane-coated perforated plates can effectively block acoustic waves over a wide low-frequency band regardless of incident angles. In the literature [ 54 ], composite rubber reinforced with hollow glass microspheres was considered a promising composite material for noise reduction, and its sound-insulation mechanism was studied based using an acoustic finite element simulation to obtain the appropriate parameters with certain constraint conditions. Kim [ 55 ] conducted a numerical simulation of sound-transmission loss for a double-panel structure with sonic crystal composed of distributed local resonators, and the results showed that the sound insulation could be significantly improved in the low-frequency range while reducing the total mass without increasing the thickness.…”

Section: Resultsmentioning

confidence: 99%

Study on Sound-Insulation Performance of an Acoustic Metamaterial of Air-Permeable Multiple-Parallel-Connection Folding Chambers by Acoustic Finite Element Simulation

Peng

Shen

et al. 2023

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In order to achieve a balance between sound insulation and ventilation, a novel acoustic metamaterial of air-permeable multiple-parallel-connection folding chambers was proposed in this study that was based on Fano-like interference, and its sound-insulation performance was investigated through acoustic finite element simulation. Each layer of the multiple-parallel-connection folding chambers consisted of a square front panel with many apertures and a corresponding chamber with many cavities, which were able to extend both in the thickness direction and in the plane direction. Parametric analysis was conducted for the number of layers nl and turns nt, the thickness of each layer L2, the inner side lengths of the helical chamber a1, and the interval s among the various cavities. With the parameters of nl = 10, nt = 1, L2 = 10 mm, a1 = 28 mm, and s = 1 mm, there were 21 sound-transmission-loss peaks in the frequency range 200–1600 Hz, and the sound-transmission loss reached 26.05 dB, 26.85 dB, 27.03 dB, and 33.6 dB at the low frequencies 468 Hz, 525 Hz, 560 Hz, and 580 Hz, respectively. Meanwhile, the corresponding open area for air passage reached 55.18%, which yielded a capacity for both efficient ventilation and high selective-sound-insulation performance.

“…Taking the distributions of the total sound energy density (TSED) around the effective sound absorption band for MCAM-MNCs-1 with the various depths of chamber T as the object, the sound absorption mechanism of MCAM-MNCs was revealed, which was obtained by the acoustic finite element simulation [44,45].…”

Section: Mechanism Investigationmentioning

confidence: 99%

“…Therefore, it further proved that the parameters of MCAM-MNCs should be reasonably selected for the expected sound absorption band, which included the diameter of aperture d, the depth of chamber T 0 , and the thickness of panel t 0 in this study. as the object, the sound absorption mechanism of MCAM-MNCs was revealed, which was obtained by the acoustic finite element simulation [44,45].…”

Section: T = 30 MMmentioning

confidence: 99%

An Investigation of Modular Composable Acoustic Metamaterials with Multiple Nonunique Chambers

Yang,

Shen,

et al. 2023

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To make the sound absorber easy to fabricate and convenient for practical application, a modular composable acoustic metamaterial with multiple nonunique chambers (MCAM–MNCs) was proposed and investigated, which was divided into a front panel with the same perforated apertures and a rear chamber with a nonunique grouped cavity. Through the acoustic finite element simulation, the parametric studies of the diameter of aperture d, depth of chamber T0, and thickness of panel t0 were conducted, which could tune the sound absorption performances of MCAM–MNCs–1 and MCAM–MNCs–2 for the expected noise reduction effect. The effective sound absorption band of MCAM–MNCs–1 was 556 Hz (773–1329 Hz), 456 Hz (646–1102 Hz), and 387 Hz (564–951 Hz) for T = 30 mm, T = 40 mm, and T = 50 mm, respectively, and the corresponding average sound absorption coefficient was 0.8696, 0.8854, and 0.8916, accordingly, which exhibited excellent noise attenuation performance. The sound absorption mechanism of MCAM–MNCs was investigated by the distributions of the total sound energy density (TSED). The components used to assemble the MCAM–MNCs sample were fabricated by additive manufacturing, and its actual sound absorption coefficients were tested according to the transfer matrix method, which demonstrated its feasibility and promoted its actual application.