Assessment of normal incidence absorption performance of sound absorbing materials

Forouharmajd, Farhad; Mohammadi, Zahra

doi:10.4103/2277-9183.184224

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…This technique (Normal Incidence Technique) [4,7,127] is based on normal incident sound energy and requires a tube (Figure 3) where its diameter is smaller than the wavelength. The absorption coefficient can be measured in impedance tube as per ASTM E 1050-12 and ISO 10534-2: 1998 standards [128,129].…”

Section: Impedance Tube Methodsmentioning

confidence: 99%

Textiles for Noise Control

Datta¹,

Das²,

Nath³

2021

Textiles for Functional Applications

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This chapter includes the mechanism of sound absorption and the classes of sound absorbing material to control the noise. The basic phenomena related to the reduction of sound by allowing it to soak in and dissipate also were introduced first, which, can be realised by viscous effects, heat conduction effects, and internal molecular energy interchanges. Porous absorbers are materials where sound propagates through an interconnected pore network resulting in sound energy dissipation. They are only effective at the mid-to-high frequency range, which is most sensitive to the human ear. The applications of different textile fibres and their various forms were identified later in the chapter. Finally, specific discussions are given to sound parameters, noise absorption coefficient, and its measurement technique. The chapter also deals with various factors influencing sound absorption.

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Section: Impedance Tube Methodsmentioning

confidence: 99%

Textiles for Noise Control

Datta¹,

Das²,

Nath³

2021

Textiles for Functional Applications

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“…High-porosity structures (>90%) attenuate sound energy by increasing the effective friction between air and pore walls [4] and are currently the mainstay of sound-absorbing materials. Among them, porous bodies produced by petroleum-based polymers and rock-and slagbased fibres are dominant due to their low prices [5][6][7][8]. However, these synthetic porous materials rely on non-renewable resources and generate pollutants (such as SOx and NOx) during the manufacturing process [9,10], thereby emitting large amounts of greenhouse gases [7,11,12].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Acoustic Performance of Porous Aerogel Composites of Graphene Oxide and Cellulose

Shao,

Lv,

Xue

et al. 2024

Coatings

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In this study, sound insulation materials with a high sound absorption coefficient were prepared. In this paper, using cellulose (CEL) and graphene oxide (GO) as the main raw materials and epichlorohydrin as the cross-linker, the CEL-GO composite aerogels were prepared via lyophilisation. The structure, molecular bonding, and acoustic absorption mechanisms of the composite aerogel were characterised and analysed using SEM, FTIR, XRD, BET, and Raman. In addition, corresponding molecular structure models were constructed. The acoustic attenuation of the CEL-GO composite aerogel was measured using a standing wave tube acoustic attenuation tester. The results show that the chemical bond between the GO and CEL composite is established, and the addition of graphene makes the pores of the composite more advanced, which is more favorable for sound absorption, and the acoustic absorption coefficient can reach up to 0.87.

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Rice straw stems reveal higher sound absorption coefficient than crushed rice straw: a sustainable approach to the recycling of rice straw

Kolya,

Kang

2023

Clean Techn Environ Policy

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Assessment of normal incidence absorption performance of sound absorbing materials

Cited by 7 publications

References 3 publications

Textiles for Noise Control

Textiles for Noise Control

Preparation and Acoustic Performance of Porous Aerogel Composites of Graphene Oxide and Cellulose

Rice straw stems reveal higher sound absorption coefficient than crushed rice straw: a sustainable approach to the recycling of rice straw

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