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

Rafique, Faisal; Wu, Jiu Hui; Naqvi, Syed Murawat Abbas; Ma, Fuyin

doi:10.1007/s40857-021-00252-3

Cited by 9 publications

(3 citation statements)

References 19 publications

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“…where R = Re(Z/ρ 0 c 0 ) and X = Im(Z/ρ 0 c 0 ) are the specific acoustic resistance and acoustic reactance. It has been confirmed that acoustic simulation using COMSOL Multi-physics finite element software can accurately and visually demonstrate the sound absorption mechanism [26][27][28][29]. First, we analyze the components of S6, which consists of a porous acoustic material layer, two air layers, and a shunt loudspeaker; the Pressure Acoustics, Frequency Domain Interface is chosen as the acoustic environment for the modeling of S6; and the profile of the three-dimensional model is shown in Figure 4b.…”

Section:  mentioning

confidence: 98%

Sound Absorption of the Absorber Composed of a Shunt Loudspeaker and Porous Materials in Tandem

Cao

et al. 2023

Polymers

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To investigate the sound absorption of the absorber composed of a shunt loudspeaker (SL) and porous materials (PM) in tandem, the normal absorption coefficients for six samples of different groups of parameters are measured using impedance tubes. It is shown that a composite structure consisting of a porous material, an air layer, a shunt loudspeaker, and an air layer arranged in sequence (PM + Air1 + SL + Air2) has the potential to achieve broadband sound absorption close to three octaves in the frequency range of 200–1600 Hz. To further explore the sound absorption mechanism of “PM + Air1 + SL + Air2”, a theoretical model based on the transfer matrix method is established, and a numerical model is built in the pressure acoustic module using COMSOL Multi-physics field software. The sound absorption coefficients and acoustic impedances predicted are in good agreement with those measured. The concerned “PM + Air1 + SL + Air2” with suitable parameters has two distinguishable sound absorption peaks in the low frequency domain and a well sound absorption spectrum similar to that of the porous material layer in the high-frequency domain. The reason for the superior sound absorption performance of “PM + Air1 + SL + Air2” lies in the fact that under the common action of the diaphragm’s mechanical vibration, the circuit’s damping loss, and the porous material’s viscous dissipation, the sound energy consumption is mainly dominated by SL in the low frequency domain and captured by PM in the high-frequency domain.

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Section:  mentioning

confidence: 98%

Sound Absorption of the Absorber Composed of a Shunt Loudspeaker and Porous Materials in Tandem

Cao

et al. 2023

Polymers

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“…1 mm, 0.7 mm, 0.8 mm, and 0.7 mm with perforation ratios of 1.04%, 2.59%, 1.56%, and 5.08%, respectively. 40 The spider-web designed cavities are divided into four main sections, with every section further partitioned into eight sub-sections of the same parameters. Each sub-section is separated with a thickness of 1 mm from its adjacent sub-section.…”

Section: Theoretical Considerationsmentioning

confidence: 99%

“…This work proposed an acoustic composite structure capable of high-efficiency sound absorption (>90%) within a 230 Hz to 470 Hz frequency range. The composite sound-absorbing structure consists of the parallel-arranged inhomogeneous microperforated panel (iMPP) [40][41][42][43] backed with spider-web designed cavities of different shapes, while the electrical equivalent circuit approach (ECM) is employed to examine its sound absorption properties and processes, it is also utilized to build a mathematical model and FEM-based simulation. The performance of the composite structure was validated by using an impedance tube for normal incidence.…”

Section: Introductionmentioning

confidence: 99%

Extremely effective broadband low-frequency sound absorption with inhomogeneous micro-perforated panel (iMPP) backed with spider-web designed cavities

Rafique

Naqvi

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Low-frequency wideband noise reduction has posed a significant problem to the scientific and technical communities in recent years. A single layer of a parallel-arranged inhomogeneous micro-perforated panel (iMPP) coupled with spider-web designed cavities is offered as a composite acoustic structure in this paper. Three different spider-web shapes have been designed and studied, i.e. circular, octagonal, and square. By controlling the different inhomogeneous patterns, perforation ratio, the thickness of iMPP, and back cavity depths, a broader multipeak low-frequency sound-absorbing performance equivalent to different resonant frequencies can be achieved. To anticipate the sound absorption coefficient of the new design, both theoretical analysis and finite-element method (FEM) simulation are executed. The predicted and FEM simulation sound absorption results of the new composite structure are verified in the experimental investigation using a square-designed sound impedance tube. By a subwavelength thickness of just 100 mm, a highly effective low-frequency broadband sound-absorbing composite structure is successfully attained by integrating many inhomogeneous MPP unit cells supported with spider-web-designed cavities. The average sound absorption coefficient is over 90% ( α = 0.94) within the bandgap of 230 Hz to 470 Hz. Compared to traditional sound-absorbing materials, the composite structure comprises inhomogeneous MPP coupled with spider-web-designed cavities, which may provide good absorption performance while maintaining a modest and robust construction for active low-frequency noise suppression.

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Sound absorption coefficient measurement and analysis for multisection perforation microperforated panel

Tan,

Wahab,

Mat

et al. 2024

J Mech Sci Technol

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

Cited by 9 publications

References 19 publications

Sound Absorption of the Absorber Composed of a Shunt Loudspeaker and Porous Materials in Tandem

Sound Absorption of the Absorber Composed of a Shunt Loudspeaker and Porous Materials in Tandem

Extremely effective broadband low-frequency sound absorption with inhomogeneous micro-perforated panel (iMPP) backed with spider-web designed cavities

Sound absorption coefficient measurement and analysis for multisection perforation microperforated panel

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