On the Acoustic Absorption of Porous Materials With Different Surface Shapes and Perforated Plates

Chen, Wen‐Hwa; Lee, Fan-Ching; Chiang, Dar-Ming

doi:10.1006/jsvi.2000.3029

Cited by 66 publications

(41 citation statements)

References 15 publications

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“…In general, to ensure the acoustic absorption of the multi-layer absorbers, selecting appropriate absorbing materials [1][2][3][4] is the primary concern. Several recent literatures [5][6][7] depicted that the surface shapes of absorbing materials also control the performance of the acoustic absorption. However, there are still seldom investigations on the influence of the inner structures employed in the multi-layer absorbers.…”

Section: Introductionmentioning

confidence: 99%

On the Acoustic Absorption of Multi-Layer Absorbers With Different Inner Structures

Lee

Chen

2003

Journal of Sound and Vibration

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Section: Introductionmentioning

confidence: 99%

On the Acoustic Absorption of Multi-Layer Absorbers With Different Inner Structures

Lee

Chen

2003

Journal of Sound and Vibration

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“…The components of the system mainly include the following. [9] (1) The impedance tube, which contains two pieces of 1/2 microphones (B&k 4133 type) and a speaker. The acoustic absorber sample is set up inside the impedance tube.…”

Section: Methodsmentioning

confidence: 99%

“…p and p are, respectively, the sound pressures measured by the "rst and second microphones. The experimental acoustic absorption coe$cient of the acoustic absorber sample can then be calculated by [9] …”

Section: Methodsmentioning

confidence: 99%

Acoustic Transmission Analysis of Multi-Layer Absorbers

Lee¹,

Chen²

2001

Journal of Sound and Vibration

117

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“…The fibrous material with triangle, semicircle, or convex shapes had better sound absorption than those with a plate shape. 10 In their further work on multilayer absorbers with different inner structures, they showed that the inner structures influenced the sound absorption at some frequency bands significantly. 11 The quantity of the porous material in front of the outmost layer of PP controlled the absorption at high frequencies.…”

Section: Introductionmentioning

confidence: 99%

Analysis on Multiple Perforated Plate Sound Absorber Made of Coir Fiber

Ayub¹,

Fouladi²,

Ghassem³

et al. 2014

IJAV

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Current studies are aiming to improve the sound absorption of coir fiber by implementing combinations of Perforated Plates (PPs) and air gaps. The Atalla and Sgrad model along with Johnson-Allard model and Acoustic Transmission Analysis (ATA) approach are used to estimate the absorption coefficient of the combination. Measurements are conducted in impedance tube to validate the analytical results. Outcomes show that the absorption coefficient of the panel is governed by the porosities of the implemented PPs. Reduction in the porosity of the face PP causes the incident sound to reflect back whereas higher porosity encourages the sound to enter and be absorbed gradually in the inner compartments. For the case of multilayer panels with two PPs, the best result is obtained when the inner PP has low porosity and is backed with an air gap. Absorption in high and low frequency bands are enhanced by having highly porous material and a thick layer of air gap in front of and behind the inner PP, respectively. This study shows that the high-frequency absorption is enhanced further in panels that include three PP layers. The study suggests fabricating panels containing two or three PPs with gradual reduction of porosity from the face PP to the inner ones, while the inner most PP has low porosity and is backed with air gap.

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On the Acoustic Absorption of Porous Materials With Different Surface Shapes and Perforated Plates

Cited by 66 publications

References 15 publications

On the Acoustic Absorption of Multi-Layer Absorbers With Different Inner Structures

On the Acoustic Absorption of Multi-Layer Absorbers With Different Inner Structures

Acoustic Transmission Analysis of Multi-Layer Absorbers

Analysis on Multiple Perforated Plate Sound Absorber Made of Coir Fiber

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