Development of an Indigenous Impedance Tube

Tan, Wei; Ahmad, Rosmaini; Zunaidi, N H; Daud, Ruslizam; Cheng, Ee Meng

doi:10.4028/www.scientific.net/amm.786.149

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…It must be noted that the tube methods have been refined over the past several decades and the schematic shown here is a very generic setup. The most recent designs in compliance with ISO standards can be referred to the works [45,46]. The work by Niresh et al [47] provides insights into recent developments on error corrections.…”

Section: Two Microphone Methods (Smm)mentioning

confidence: 99%

An Overview of Acoustic Impedance Measurement Techniques and Future Prospects

et al. 2021

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In order to progress in the area of aeroacoustics, experimental measurements are necessary. Not only are they required for engineering applications in acoustics and noise engineering, but also they are necessary for developing models of acoustic phenomenon around us. One measurement of particular importance is acoustic impedance. Acoustic Impedance is the measure of opposition of acoustical flow due to the acoustic pressure. It indicates how much sound pressure is generated by the vibration of molecules of a particular acoustic medium at a given frequency and can be a characteristic of the medium.The aim of the present paper is to give a synthetic overview of the literature on impedance measurements and to discuss the advantage and disadvantage of each measurement technique. In this work, we investigate the three main categories of impedance measurement techniques, namely reverberation chamber techniques, impedance tube techniques, and far-field techniques. Theoretical principles for each technique are provided along with a discussion on historical development and recent advancements for each technique.

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Section: Two Microphone Methods (Smm)mentioning

confidence: 99%

An Overview of Acoustic Impedance Measurement Techniques and Future Prospects

et al. 2021

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“…To overcome this limitation, many works of literature focus on the physical design which discusses the appropriate dimension and vibroacoustic response of the impedance tube [20][21][22][23][24]. Although extensive research has been carried out on developing custom-built setups for measuring the absorption coefficient of acoustic materials, no single study, to the best of our knowledge, exists which applies to flexible textiles only.…”

Section: Introductionmentioning

confidence: 99%

Design of an improved impedance tube to measure sound absorption coefficients of flexible textile materials

Li,

Dai,

Yao

et al. 2024

Eng. Res. Express

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Abstract： Textile materials have demonstrated significant potential in sound noise reduction due to their porous, lightweight, and easily processed nature. However, the current experimental setup for measuring the sound absorption of small-sized samples is expensive. Additionally, there is a lack of suitable equipment for measuring the sound absorption of flexible textiles as it is challenging to mount flexible samples into an impedance tube. This paper presents the design, fabrication, and testing of impedance tubes specifically designed for measuring the sound absorption coefficients of textile materials. The impedance tubes were designed based on the transfer function and two-microphone methods, with diameters of 100 mm and 30 mm. These tubes covered frequency ranges from 200-1600 Hz and 500-6400 Hz, respectively. Furthermore, improved sample holders were developed to mount flexible textile materials without altering the acoustic impedance characteristics of the front surface of the test sample. Validation experiments were conducted on melamine foams, and the results were compared with those obtained from the commercial B&K 4206 setup. The results obtained from the designed setup showed good agreement with those from the B&K 4206 system. The maximum error observed was 8% at 2800 Hz for the 30 mm diameter tube and 8.3% at 1600 Hz for the 100 mm diameter tube. Finally, the designed system was used to measure the sound absorption coefficients of textile materials with varying densities. The results obtained were consistent with the material properties, demonstrating the effectiveness of the designed setup.

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“…Pierre J. et al (2013) [34], Koruk H. (2014) [35], Tan W.H. et al (2015) [36], and Neto B.N. et al (2018) [37] all carried out experimental analyses of the variation in the sound absorption coefficient for measurements on the impedance tube.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Research on the Use of Bulk Recycled Materials for Sound Insulation Applications

et al. 2022

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The application of recycled materials from the automotive industry in the field of the construction industry is a suitable alternative application for these materials and the use of their acoustic and thermal insulation properties. The output of recycling is granular, or chopped materials that can be used as a substitute for conventional materials. One of the important features of building materials is their acoustic properties. The measurement and evaluation of acoustic properties is carried out using an impedance tube as equipment. Measuring compact materials is quite simple and requires the preparation of a sample. Measuring the acoustic properties of granular bulk materials is more complicated and requires the development and production of a special test cartridge. Recycled bulk materials from the automotive industry such as rubber granules and chopped textiles can be applied as fillings for dividing structures. The aim of this paper was to assess the acoustic properties of different fractions of recycled rubber granules and textile chopped material and to compare acoustic properties with compact rubber and textile panels. To evaluate and compare sound absorption coefficient (α) and sound transmission loss (R) parameters, we used basic statistical methods and hypothesis testing methods. The production of compact panels is quite expensive since it is necessary to use special synthetic binders in production, and the content of these substances can also have negative effects on the environment. Based on the results of measuring the acoustic properties of bulk recycled materials and comparing them with compact materials, we can conclude that bulk recycled rubber and textile materials have very good values for their acoustic properties, which enables them to be used in several areas of industry.

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Development of an Indigenous Impedance Tube

Cited by 5 publications

References 5 publications

An Overview of Acoustic Impedance Measurement Techniques and Future Prospects

An Overview of Acoustic Impedance Measurement Techniques and Future Prospects

Design of an improved impedance tube to measure sound absorption coefficients of flexible textile materials

Analysis and Research on the Use of Bulk Recycled Materials for Sound Insulation Applications

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