Performance Testing for Sound Absorption Coefficient by Using Impedance Tube

J, Niresh; Neelakrishnan, S.; Subharani, S; Prabhakaran, R.

doi:10.19026/rjaset.11.1706

Cited by 7 publications

(5 citation statements)

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“…Consequently, it simplifies the three-dimensional wave equations to one-dimensional wave equation. The sample size is small compared to reverberation method [38].…”

Section: Measurement Of Acoustic Absorption Characteristics By Impedamentioning

confidence: 99%

Investigation of Sound Absorption Characteristics of Textile Materials Produced from Recycled Fibers

Özdіl¹,

Kayseri²,

Mengüç³

2020

Waste in Textile and Leather Sectors

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Excessive sound causes growing public well-being problems and significant environmental contamination in our daily life. Generally, most of the noise problems are difficult to be treated at source, and the reduction of noise emission is usually achieved through the use of noise isolation processes. In recent times, nonwovens as one of the most common textile products have become valuable sound absorption materials. These materials are used as sound absorbers, sound diffusers, noise barriers, and sound reflectors. For sustainable development of the textile industry, solutions for both decreasing waste and reducing noise have been searched for years. Due to the good sound absorbing properties, recycled materials are becoming an attractive option to traditional materials for practical purposes. In this study, the measurement methods of acoustic characteristics of textile materials are explained, and the sound absorption features of nonwoven fabrics made from both pure and recycled polyester and polypropylene fibers are compared.

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“…Consequently, it simplifies the three-dimensional wave equations to one-dimensional wave equation. The sample size is small compared to reverberation method [38].…”

Section: Measurement Of Acoustic Absorption Characteristics By Impedamentioning

confidence: 99%

Investigation of Sound Absorption Characteristics of Textile Materials Produced from Recycled Fibers

Özdіl¹,

Kayseri²,

Mengüç³

2020

Waste in Textile and Leather Sectors

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“…The dynamic properties of composites can be studied by free vibration tests in fixed boundary conditions, which is economical as well as effective. This process was used in order to determine the modulus of elasticity under dynamic conditions, and results were obtained for the damping properties of three normal wood-made composite materials, namely highdensity fiberboard, plywood, oriented strand board, and others [16][17][18]. The present study focused on developing sound-absorbing and vibration-isolating structural materials for automotive applications.…”

Section: Introductionmentioning

confidence: 99%

Influence of fiber length and moisture content on sound and vibration characteristics of hemp/epoxy composites

Singh,

Nayak,

Hegde

et al. 2023

J Appl Eng Science

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Bio-composites have become increasingly popular as a substitute for synthetic fibers over the last decade due to their eco-friendly nature. To utilize them effectively in engineering applications, particularly in the automotive industry, a thorough understanding of the material properties is necessary. This experimental investigation focuses on exploring the vibration-damping and acoustic properties of fiber composites made from hemp natural fiber and epoxy resin. The study involved the preparation of composite specimens using both short and long fibers through a hand layup process. The natural frequency and damping ratio of the specimen were computed from time-domain experimental data. The sound absorption coefficient of fiber specimens was determined in the frequency range of 63 Hz to 6300 Hz by using the impedance tube technique. The analysis revealed that the pre-treatment of fiber and the use of long fiber rather than short fiber enhances the damping properties of hemp fiber composites. Immersion of specimens in water resulted in the degradation of damping properties. Acoustic tests clearly showed that the ageing process affected short-treated fiber composites more significantly when compared to long-treated fiber composites.

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“…The sound absorption coefficient of twelve bamboo twigs was measured using a two-microphone impedance tube. Impedance tubes are used not only because they are costeffective [14] but also because they only use material with diameter 100 mm. In this study, the frequency used is 100-1600 Hz with standardization ISO 10534-2:1998 [15].…”

Section: Methodsmentioning

confidence: 99%

Investigation of Depth Variations of the Bamboo Twigs for its Acoustical Performance

Kurniawan

Kusno

Mulyadi

2023

MSF

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This study aims to determine the relationship between variations in the depth of bamboo twigs with the sound absorption coefficient. The sample consisted of 12 bamboo twigs made up of three types of depth variations. Measurement of sound absorption of bamboo twigs using two microphone impedance tubes and B & K Lab shop software version 16. Standardization ISO 10534-2:1998 [1] was used to test parameters between 100 and 1600 Hz. This type of research is a comparative quantitative approach, data processing using Pulse Lab shop version 16 and visualized into a curve graph using Microsoft Excel. The results showed that the bamboo twig material with a depth of 50 mm was better than 25 mm with an absorption coefficient (α) of 0,68 at a frequency of 1600 Hz. While the material with a thickness of 75 mm only absorbs at a frequency of 1100 Hz with a maximum absorption coefficient of 0,57. According to ISO 11654 [2], it shows that bamboo twigs have the potential to be used as sound-absorbing materials. The sound absorption coefficient value of bamboo twigs rises from low to high frequency with increasing twig depth.

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Performance Testing for Sound Absorption Coefficient by Using Impedance Tube

Cited by 7 publications

References 0 publications

Investigation of Sound Absorption Characteristics of Textile Materials Produced from Recycled Fibers

Investigation of Sound Absorption Characteristics of Textile Materials Produced from Recycled Fibers

Influence of fiber length and moisture content on sound and vibration characteristics of hemp/epoxy composites

Investigation of Depth Variations of the Bamboo Twigs for its Acoustical Performance

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