Measurement of the Acoustic Absorption Coefficient by Impedance Tube

Labašová, Eva; Ďuriš, Rastislav

doi:10.2478/rput-2019-0031

Cited by 6 publications

(3 citation statements)

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“…The representative AAMMs with different adjustment states analyzed in the theoretical and numerical simulation were measured in the AIHUA AWA8551(T) impedance tube with an internal diameter of 100 mm, using the standard two-microphone method (as shown in figure 16) [33,34], and the experimental verification results were shown in figure 17(a)-(e). The results show that the theoretical and numerical simulation models agree with the experimental results, verifying the feasibility of the derived theory and simulation method.…”

Section: Experimental Validation 41 Acoustic Experimentsmentioning

confidence: 99%

A mechanically adjustable acoustic metamaterial for low- frequency sound absorption with load-bearing and fire resistance

Wang,

Hu,

Mao

et al. 2023

Phys. Scr.

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Broadband sound absorption is limited to discrete noise with abrupt peaks in the spectrum. Here, we proposed a mechanically adjustable acoustical metamaterials (AAMM) for low-frequency sound absorption with deep-subwavelength (0.025), which integrates Helmholtz resonators and Fabry-Perot (FP) tubes by precise modular design. The calculation results based on the theoretical model demonstrate that the broad low frequency (from 100 Hz to 500 Hz) tunability of the composite adjustable sound absorbing materials. The adjustable design scheme is further verified by numerical simulation. Then a multi-impedance adjustment method is proposed to improve the local optimal defect and make it have quasi-perfect sound absorption effect in the range of 120Hz-348Hz. The sound absorbing material sample can withstand 2.7 tons of dynamic load and 1300° high temperature, presenting superior compression and fire resistance compared to conventional porous sound absorbing materials and membrane acoustic metamaterials. This research on assembled machine-adjustable sound absorption material enriches the conventional acoustic metamaterial design scheme, further improves the space utilization rate, and provides an effective solution for dealing with low-frequency complex variable noise.

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Section: Experimental Validation 41 Acoustic Experimentsmentioning

confidence: 99%

A mechanically adjustable acoustic metamaterial for low- frequency sound absorption with load-bearing and fire resistance

Wang,

Hu,

Mao

et al. 2023

Phys. Scr.

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“…Akiwate D. et al (2019) [26] examined the acoustic properties of porous materials produced by 3D printing. Labašová E. and Ďuriša R. (2019) [27] evaluated the sound absorption coefficient for various single-layer and two-layer materials (cork, felt, polyethylene). Gumanová V. et al [28] and Moravec M. et al [29,30] also devoted themselves to similar research.…”

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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“…Methods of measuring the acoustic properties of materials including impedance tube were discussed by Lumnitzer et al [8]. Experimental measurement of the absorption coefficient of cork, polyethylene foam EVA and polyethylene LDPE (felt), using a two-microphone method on own constructed impedance tube was performed by Labašová and Ďuriš [9]. The measuring of sound absorption characteristics of the natural fibrous material from coconut coir, oil palm fruit bunches, and pineapple leaf using impedance tube a two-microphone method was realized by Rusli et al [10].…”

Section: Introductionmentioning

confidence: 99%

Impedance Tube as a Tool for Evaluating Acoustic Noise Descriptors - The Experimental Measurement of Acoustic Parameters

Gumanova¹,

Dzunova²,

Sobotova³

et al. 2020

AMS

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Against the background of severe problems related to environmental noise, there has been a significant increase in the demand for its controlling. It has led to an increase in research efforts to develop the correct ways of measuring acoustic descriptors with the closely related research of soundproof and highly sound absorptive building materials. The sound insulation capacity of a barrier is indicated by two acoustic parameters-sound absorption and transmission loss. The contribution describes the principle, methods, and process of measurement of acoustics parameters using an impedance tube, explains the notion of sound absorption and transmission loss, and demonstrates this knowledge in the experimental measurement of acoustic parameters of selected materials (textiles from the automobile, polyurethane foam and absorbent cotton).

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Measurement of the Acoustic Absorption Coefficient by Impedance Tube

Cited by 6 publications

References 0 publications

A mechanically adjustable acoustic metamaterial for low- frequency sound absorption with load-bearing and fire resistance

A mechanically adjustable acoustic metamaterial for low- frequency sound absorption with load-bearing and fire resistance

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

Impedance Tube as a Tool for Evaluating Acoustic Noise Descriptors - The Experimental Measurement of Acoustic Parameters

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