Numerical study of the acoustic properties of micro-perforated panels with tapered hole

Qian, Yang; Cui, Kai; Liu, S.M.; Li, Z.B.; Kong, Deyan; Sun, Shulei

doi:10.3397/1/376216

Cited by 15 publications

(2 citation statements)

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“…Qian et al used the finite element model (FEM) analysis and found that the maximum sound absorption coefficient of the tapered hole MPP increased with the decrease of the hole entrance diameter or the increase of the hole exit diameter on the panel. 50 Ren et al performed numerical simulations on MPPs with periodically arranged circular micropores, as shown in Fig. 2(a) and (b) , and found that the sound absorption performance was significantly affected by the shape of the pores through modification of the velocity field and the viscous dissipation.…”

Section: Acoustic Metamaterialsmentioning

confidence: 99%

Progress of low-frequency sound absorption research utilizing intelligent materials and acoustic metamaterials

et al. 2021

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Section: Acoustic Metamaterialsmentioning

confidence: 99%

Progress of low-frequency sound absorption research utilizing intelligent materials and acoustic metamaterials

et al. 2021

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“…The works of Sun et al and Yang et al led to that the shear region around per pore was lower and each pore was had a less attached mass than widely separated pores. In the work of Qian et al, it was illustrated that the nonlinear regime, which was mainly dependent on perforates on the incident velocity level, occurred above ∼130 dB for the pores with submillimeter sizes of 22% and 7.5% porosity. It is also reported that the influence of micropore interaction was hidden in the flow coefficient.…”

Section: Introductionmentioning

confidence: 99%

Effect of hole on sound absorption coefficient of micro‐perforated panels investigated by Melling computing

Wang

Xiong

2018

Concurrency and Computation

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Microperforated board is one of the important ways to absorb noise. However, the mechanism is still not well understood of the interaction between micropores, and the influence of the distance between the micropores on the sound absorption performance of microperforated plates is still not clarified. Professor Merlin introduced the influence of micropore interaction on the sound absorption performance of microperforated plates. Based on Maa and Melling theory, this paper proposed an absorption coefficient that considers the effect of perforation interactions. In addition, the formula was used to calculate the absorption coefficient and the resonance frequency and, subsequently, was tested by the conducted experiments. The results show that the structure parameters of the micro-perforated panel affect its absorption coefficient, and the model can search the absorption coefficient more efficiently, with the calculated result close to the experimental value. KEYWORDS cavity on the back, micro-perforated panel (MPP), nonlinear, sound absorption coefficient INTRODUCTIONFor decades, the use of micro-perforated panel (MPP), a sound absorbing material placed in front of a rigid wall, has been highly regarded, and a schematic diagram of the structure is shown in Figure 1. As the Figure shown, there exists a gap/cavity between the sound absorbing material and the wall, with many holes on the MPP sheet. MPP provides a high sound absorption coefficient in low frequency ranges and a wider absorption bandwidth, having many advantages such as low cost, light weight, small size solution, and simple structure. Compared with traditional porous materials, MPP can be used not only in outdoor environments but also in indoor surroundings. Moreover, MPP does not cause air pollution but can withstand noise in any environment such as washing, wind, and freezing. Therefore, MPP can be used in the field of noise control and is considered to be a potential absorbing material with ideal effect in the future. For example, the microperforated board with polymer material is an innovative material for absorption noise.The sound absorption principle of the MPP absorber was analyzed by an equivalent circuit model, regarded as one of the more valuable theories.The basic principle was following the Helmholtz resonator, 1 with the parameters such as aperture size, aperture distance, and backing volume. Wan et al, 2 Duval et al, 3 and Mejdi and Atalla 4 established the MPP noise absorption formula based on classical plate equations and acoustic equations, which can explain the vibration effects of acoustic perforation boards. Maury et al 5 also indicated that the MPP structure can be used to amplify the acoustic absorption range, if it was considered as a modal response. Also, the experimental values had a good consistency with model calculated results by combining the characteristics of the rectangular MPP with the tension effect, modeling the air flow resistance. 6 Generally speaking, structural vibrations improve the precision of the model, which i...

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Enhanced wideband low-frequency sound absorption of a single-layer multiple parallel-arranged inhomogeneous microperforated panel absorber

Rafique

Naqvi

et al. 2021

Acoust Aust

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Numerical study of the acoustic properties of micro-perforated panels with tapered hole

Cited by 15 publications

References 0 publications

Progress of low-frequency sound absorption research utilizing intelligent materials and acoustic metamaterials

Progress of low-frequency sound absorption research utilizing intelligent materials and acoustic metamaterials

Effect of hole on sound absorption coefficient of micro‐perforated panels investigated by Melling computing

Enhanced wideband low-frequency sound absorption of a single-layer multiple parallel-arranged inhomogeneous microperforated panel absorber

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