Analysis on Multiple Perforated Plate Sound Absorber Made of Coir Fiber

Ayub, M.; Fouladi, Mohammad Hosseini; Ghassem, Masomeh; Nor, Mohd Jailani Mohd; Najafabadi, Hamidreza Soheili; Amin, Nowshad; Zulkifli, Rozli

doi:10.20855/ijav.2014.19.3354

Cited by 11 publications

(7 citation statements)

References 19 publications

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“…The result was that this material could be used in commercial automotive mufflers [19]. Similar to the MPP, multi layer absorbers supported by the Helmholtz resonator and compartment cavities were developed by Ayub et al and Kidner and Hansen [20,21]. The design of absorber is an approach that gives benefits not only in the absorption shift to a lower band, but also in improving MPP performance in the medium-high frequency range.…”

Section: Introductionmentioning

confidence: 99%

On the Role of Acoustical Improvement and Surface Morphology of Seashell Composite Panel for Interior Applications in Buildings

et al. 2019

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This manuscript focuses on the acoustical behaviors and surface morphology of seashell waste filler reinforced polyester (SFRP) coverings Anadara granosa Linn, Perna viridis Linn, and Placuna placenta Linn and applications in buildings. Their acoustical performances were observed using an impedance tube using a technique with two and four microphones based on ASTM E1050-98 and ASTM E2611-09. The improvements of acoustical performance were conducted by a coupled resonator inclusion with addition of a fibrous dacron layer and back cavity. The experimental results showed that the resonators and back cavity on the material structure were able to shift the absorption ability at low frequency. The promising wide broadband frequencies performance occurred when the 15 mm Placuna placenta FRP treated with front-tailed cavity without any additional fibrous layer and air gap started from 0.2 at 2.0 kHz. The combination of resonators and fibrous layer on the material structure was able to stabilize the sound transmission loss (STL) in 52–56 dB at a high frequency. On the observation of the simple surface morphology material, it was found that Placuna placenta Linn had the highest damping performances due to the smallest pores and the most carbon compound compared to the others. Therefore, this finding is very useful for building applications.

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Section: Introductionmentioning

confidence: 99%

On the Role of Acoustical Improvement and Surface Morphology of Seashell Composite Panel for Interior Applications in Buildings

et al. 2019

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“…It was found to be an effective filler in the fiber matrix composite, improving the mechanical properties of the materials. 15 Ayub et al 16 successfully evaluated the sound absorption coefficient of multiple perforated plate sound absorber made of coconut coir fiber. Their investigation confirmed that a decreased porosity promotes the sound absorption performance of a composite in the low-frequency region.…”

Section: Novel Implementation Of Natural Fibro-granular Materials As mentioning

confidence: 99%

Novel implementation of natural fibro-granular materials as acoustic absorbers

Mamtaz

Fouladi

Namasivayam

et al. 2018

Noise & Vibration Worldwide

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In this study, a new innovative fibro-granular composite was prepared as a natural acoustic material by combining fibrous and granular materials. Delany-Bazley model and Biot-Allard techniques were utilized to estimate the absorption coefficient of the developed composite material. The predicted values were validated through an analytical outcome employing Johnson-Champoux-Allard technique and an experimentally measured value which were conducted in an impedance tube. The outcomes showed the reflection of the good agreement between the analytical and experimental methods. The current research concluded that the introduction of granular materials provides significant contribution in enhancing the surface area within the composite, thereby achieving a promising acoustic absorption in the low-frequency region which is below 1 kHz. In addition, the current research also reports that, like Johnson-Champoux-Allard model, Delany-Bazley and Biot-Allard models are also two efficient analytical tools for predicting the significant low-frequency acoustic absorption performance of a fibro-granular composite.

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“…Current analytical models for the prediction of the sound absorption coefficient can provide accurate results over large operating ranges, but they are highly complex and require comprehensive experimental testing to determine many variables [1]. This is often not feasible to use in practical applications [2].…”

Section: Introductionmentioning

confidence: 99%

Development of an empirical model for the prediction of the sound absorption coefficient for thin and low-density fibrous materials

Dunne,

Desai,

Heyns

2024

J. vibroeng.

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Currently, FEA software such as ABAQUS uses empirical models to predict the sound absorption coefficient of poroelastic materials. However, based on a recent review of the literature it was found that the current sound absorption empirical models are inadequate for accurate prediction of thin (t < 20 mm), low-density materials (ρB < 50 kg/m3). Therefore, the predictions of the sound pressure levels in vehicle cabins, using such software, will be inaccurate since the trim materials are thin and have a low density. Thus, this research aimed to develop an empirical model that can accurately predict the sound absorption coefficient of these materials. Hence, polypropylene fibres consisting of four different diameters were manufactured and converted into nonwovens. Thereafter, airflow resistivity and impedance tube experimental testing were performed on the specimens. Subsequently, statistical analysis of the data was performed using SAS software. SAS was used to identify which independent variables should be included in the models to be developed. The empirical models were developed using the regression analysis toolbox in Microsoft Excel. Once the models were developed, various checks were performed to validate the assumptions of linear regression. The software NumXL was used to perform Cook’s distance tests. Thereafter, the models were validated against the validation dataset, where it was found that the developed exponential model performed best. Finally, the exponential model was compared to existing models using two data sets i.e. an internal dataset, and an external dataset derived from the literature. The developed model outperformed all the historic models on both datasets.

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Analysis on Multiple Perforated Plate Sound Absorber Made of Coir Fiber

Cited by 11 publications

References 19 publications

On the Role of Acoustical Improvement and Surface Morphology of Seashell Composite Panel for Interior Applications in Buildings

On the Role of Acoustical Improvement and Surface Morphology of Seashell Composite Panel for Interior Applications in Buildings

Novel implementation of natural fibro-granular materials as acoustic absorbers

Development of an empirical model for the prediction of the sound absorption coefficient for thin and low-density fibrous materials

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