Design of Multiple Parallel-Arranged Perforated Panel Absorbers for Low Frequency Sound Absorption

Li, Xin; Wu, Qianqian; Kang, Ludi; Liu, Bilong

doi:10.3390/ma12132099

Cited by 26 publications

(5 citation statements)

References 16 publications

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“…Simulated annealing is an optimization algorithm based on Monte Carlo iteration. Because of its global optimization and strong robustness, it is widely used in the optimization of multi-objective parameters in acoustic materials and structures [26,[31][32][33][34]. In this paper, the inverse calculation of five non-acoustic parameters is transformed into the solution of a set of optimal values.…”

Section: Inversion Of Non-acoustic Parametersmentioning

confidence: 99%

An Investigation on the Sound Absorption Performance of Granular Molecular Sieves under Room Temperature and Pressure

Zhou

Zhang

et al. 2020

Materials

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The sound absorption of granular silica-aluminate molecular sieve pellets was investigated in this paper. The absorption coefficients of molecular sieve pellets with different pore sizes, pellet sizes, and layer thicknesses were measured through impedance tubes under room temperature and pressure conditions. The effects of pore size, pellet size, layer thickness were compared and explained. The comparisons show that at room temperature and pressure, the sound absorption of molecular sieve pellets is not a result of the crystalline structure, but rather it mainly changes with the pellet size and layer thickness. In addition, the five non-acoustical parameters of molecular sieve pellets were obtained by an inverse characterization method based on impedance tube measurements. The measurement by impedance tubes is in good agreement with the calculation of Johnson-Champoux-Allard (JCA) model, proving that the JCA model can be effectively used to predict the sound absorption of molecular sieve pellets.

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Section: Inversion Of Non-acoustic Parametersmentioning

confidence: 99%

An Investigation on the Sound Absorption Performance of Granular Molecular Sieves under Room Temperature and Pressure

Zhou

Zhang

et al. 2020

Materials

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“…Multilayer microperforated panel absorbers have been utilized to enlarge the sound-absorption bandwidth [ 13 , 14 , 15 , 16 , 17 ]. In order to overcome the shortcomings of single sound-absorbing materials and structures, composite sound-absorbing structures of porous materials and microperforated panels have been proposed [ 18 , 19 , 20 , 21 ]. In order to obtain better sound-absorption performance in the low-frequency range, many effective acoustic metamaterials have been developed, which can obtain excellent sound-absorption properties with a thickness of one in dozens of subwavelengths [ 22 , 23 , 24 , 25 ].…”

Section: Introductionmentioning

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

Materials

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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.

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“…Sakagami and colleagues [37] explored two parallel-arranged MPP resonators, including associated panels and cavities, with or without interior partitions, yielding good agreement between theory and measurement. The authors of [38][39][40] all studied the different potential parallel-arranged MPPs on the system's absorption coefficient. These studies show that the absorption bandwidth is expanded to lower frequencies due to the additional multi-resonance peaks.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Potential of Transparent Parallel-Arranged Micro-Perforated Panels (MPPs) as Sound Absorbers in Classrooms

Fasllija

Yılmazer

2023

IJERPH

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Acoustic deficiencies due to lack of absorption in indoor spaces may sometime render significant buildings unfit for their purpose, especially the ones used as speech auditoria. This study investigates the potential of designing wideband acoustic absorbers composed of parallel-arranged micro-perforated panels (MPPs), known as efficient absorbers that do not need any other fibrous/porous material to have a high absorptive performance. It aims to integrate architectural trends such as transparency and the use of raw materials with acoustical constraints to ensure optimal indoor acoustic conditions. It proposes a structure composed of four parallel-arranged MPPs, which have been theoretically modelled using the electrical Equivalent Circuit Model (ECM) and implemented on an acrylic prototype using recent techniques such as CNC machining tools. The resulting samples are experimentally analysed for their absorption efficiency through the ISO-10534-2 method in an impedance tube. The results show that the prediction model and the experimental data are in good agreement. Afterward, the investigation focuses on applying the most absorptive MPP structure in a classroom without acoustic treatment through numerical simulations in ODEON 16 Acoustics Software. When the proposed material is installed as a wall panel, the results show an improvement toward optimum values in Reverberation Time (RT30) and Speech Transmission Index (STI).

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Design of Multiple Parallel-Arranged Perforated Panel Absorbers for Low Frequency Sound Absorption

Cited by 26 publications

References 16 publications

An Investigation on the Sound Absorption Performance of Granular Molecular Sieves under Room Temperature and Pressure

An Investigation on the Sound Absorption Performance of Granular Molecular Sieves under Room Temperature and Pressure

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

Investigating the Potential of Transparent Parallel-Arranged Micro-Perforated Panels (MPPs) as Sound Absorbers in Classrooms

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