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Journal articles on the topic 'Coefficient of Sound'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Kato, Taro, Takuya Kitamura, Fumiya Maehara, et al. "Calculation of 1/f Fluctuation from Sound Signal and Comfort Evaluation." Applied Sciences 12, no. 19 (2022): 9425. http://dx.doi.org/10.3390/app12199425.

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Providing a comfortable sound for users is an important factor for high-value products. Therefore, many studies have investigated pleasant sound levels for developing and manufacturing new products. Notably, sounds containing 1/f fluctuations provide a relaxing effect in humans. There are many studies on the influence of sound signals, including 1/f fluctuations; however, the verification of fluctuations, including sound signals, has not been performed. In this study on fluctuation, the discrete Fourier transform was used to directly calculate the time of the sound signal. We evaluated the dur

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Defrianto, Defrianto, Muhammad Ahlunnazah, Saktioto Saktioto, and Nuraina Fika Lubis. "Acoustic Absorption Coefficient of Oil Palm Midrib Composite." Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat 22, no. 1 (2025): 84. https://doi.org/10.20527/flux.v22i1.20339.

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Composite from oil palm midrib waste is one of the natural fiber materials that can reduce noise. Its material sample composite with gypsum was placed inside an impedance tube, which fitted with the mass of palm midrib mill, i.e., 0.1 kg, 0.15 kg, and 0.2 kg. Next, sound absorption coefficients were measured based on the two farthest ranges of the sound-receiving microphone, i.e., range A, which was 45 cm from the sample, and range B, which was 55 cm from the sample. Sound source frequencies were used, i.e., 125 Hz, 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz. This research found that the link betwee

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Szamel, Grzegorz, and Elijah Flenner. "Microscopic analysis of sound attenuation in low-temperature amorphous solids reveals quantitative importance of non-affine effects." Journal of Chemical Physics 156, no. 14 (2022): 144502. http://dx.doi.org/10.1063/5.0085199.

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Sound attenuation in low-temperature amorphous solids originates from their disordered structure. However, its detailed mechanism is still being debated. Here, we analyze sound attenuation starting directly from the microscopic equations of motion. We derive an exact expression for the zero-temperature sound damping coefficient. We verify that the sound damping coefficients calculated from our expression agree very well with results from independent simulations of sound attenuation. Small wavevector analysis of our expression shows that sound attenuation is primarily determined by the non-affi

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4

Laukaitis, Antanas, and Vytautas Lasauskas. "AKYTOJO BETONO GARSO ABSORBCIJOS TYRIMAI/POROUS CONCRETE SOUND ABSORPTION INVESTIGATION." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 2, no. 8 (1996): 67–72. http://dx.doi.org/10.3846/13921525.1996.10590174.

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Low-density porous concrete can be used as a sound absorbing material. This paper generalizes porous concrete sound absorption investigations. Porous concrete relative wave resistance modulus is longer than air wave resistance W=1 and that is why this material can be ascribed to materials with a high resistance to air flows, i.e. materials with a satisfactory sound absorption. Various thickness porous concrete sample sound absorption coefficients can be calculated according to equations (1), (2), (3), when wave parameter values are determinated (Table 1). Normal sound absorption coefficient me

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Sakamoto, Shuichi, Kodai Sato, and Gaku Muroi. "Improvement of Sound-Absorbing Wool Material by Laminating Permeable Nonwoven Fabric Sheet and Nonpermeable Membrane." Technologies 12, no. 10 (2024): 195. http://dx.doi.org/10.3390/technologies12100195.

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Thin sound-absorbing materials are particularly desired in space-constrained applications, such as in the automotive industry. In this study, we theoretically analyzed the structure of relatively thin glass wool or polyester wool laminated with a nonpermeable polyethylene membrane and a permeable nonwoven fabric sheet. We also measured and compared the sound-absorption coefficients of these samples between experimental and theoretical values. The sound-absorption coefficient was derived using the transfer matrix method. The Rayleigh model was applied to describe the acoustic behavior of glass

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Jayamani, Elammaran, Pushparaj Ezhumalai, Sinin Hamdan, and M. Rezaur Rahman. "Investigation on Sound Absorption Coefficients of Betel Nut Fiber Reinforced Polymer Matrix Composites." Applied Mechanics and Materials 465-466 (December 2013): 901–5. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.901.

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This research investigates the sound absorption coefficients of betel nut fibers (Areca Fibers) reinforced with thermoplastic (Polypropylene) and thermoset (Unsaturated polyester) matrix composites with different fiber loadings and frequencies. In this research we used 5%, 10%, 15%, and 20% of betel nut fibers in the polymer matrix and the test frequencies are from 400 Hz to 1800 Hz. There are two standardized methods used for measuring the normal incidence sound absorption coefficient of composites namely, standing wave method (ISO 10534-1) and two fixed microphone method (ISO 10534-2). From

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Tomiku, Reiji, Noriko Okamoto, Toru Otsuru, Shun Iwamoto, and Shoma Suzuki. "Finite element sound field analysis on measurement of absorption coefficient in a reverberation room -Relationships between inclination of walls and measurement results-." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (2021): 5571–77. http://dx.doi.org/10.3397/in-2021-3158.

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The absorption coefficients in a reverberation room are most representative measure for evaluating absorption performance of architectural materials. However, it is well known that measurement results of the coefficient vary according to a room shape of the measurement and area of the specimen. Numerical analyses based on wave acoustics are effective tools to investigate these factors on absorption coefficient measurement in reverberation room. In this study, sound fields for the measurement of absorption coefficient in reverberation room are analyzed by time domain finite element method (TDFE

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IM, Seung Uk, Cheong Ah Lee, Changsoo Kim, and Dong-guk Paeng. "A study on the prediction model of water column sound absorption coefficients considering the characteristics of the East Sea of South Korea." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A134. http://dx.doi.org/10.1121/10.0023032.

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East Sea of Korea has the deepest water depth among Korean seas, and the water column changes are distinct in space and time, resulting in a wide range of water column sound absorption coefficients. In this study, we calculate and analysis the spatiotemporal variation of water column sound absorption coefficient in the East Sea of Korea, which has unique oceanographic characteristics. Using extensive CTD data from the Korea Oceanographic Data Centre (KODC) from 1991 to 2021, we calculate the sound absorption coefficient using the widely applied Francois–Garrison model and reveal the unique abs

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9

Kang, Chun-Won, Kazuharu Hashitsume, and Eun-Suk Jang. "Investigation of the sound-absorbing performances of pure coffee grounds." BioResources 18, no. 2 (2023): 3308–18. http://dx.doi.org/10.15376/biores.18.2.3308-3318.

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Various natural sound-absorbing materials such as rice by-products, coir fiber, date palm fiber, peanut husks, hardwood cross-sections, and forest by-products have been introduced to replace petroleum-based sound-absorbing materials in previous studies, and their sound-absorbing performance was significant. This study investigated the sound-absorbing performance of pure coffee grounds as an eco-friendly sound-absorbing material. After inserting coffee grounds into cylindrical holders with lengths of 20, 30, and 40 mm, the density of the coffee grounds was adjusted from 0.2 to 0.5 g/cm3. Then,

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Satoh, Takamasa, Shuichi Sakamoto, Shunsuke Unai, et al. "Sound-absorption coefficient of a pin-holder structure for sound waves incident in the direction perpendicular to the cylinder's axis." Noise Control Engineering Journal 70, no. 2 (2022): 136–49. http://dx.doi.org/10.3397/1/377012.

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In this study, the sound-absorption coefficients of a pin-holder structure consisting of a group of cylinders were estimated and compared with the experimental values for the case where sound waves are incident in the direction perpendicular to the cylinder's axis. To estimate the sound-absorption coefficient, the gap in the pinholder structure is divided into elements and approximated as being between two parallel planes, taking the exact shape of the divided elements into account. The characteristic impedance and propagation constant of the approximated clearances were calculated and treated

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11

Sa'adon, Shafizah, and Anika Zafiah M. Rus. "Utilization of Treated Red Meranti Wood Dust as Polymer Foam Composite for Acoustic Study." Key Engineering Materials 594-595 (December 2013): 760–64. http://dx.doi.org/10.4028/www.scientific.net/kem.594-595.760.

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A Red Meranti Wood Dust (RMD) act as a filler for polymer foam composite has been investigated and proved to have ability to absorb sound. In this study, treatment of wood dust with and without acid hydrolysis named as WDB and WDA respectively was use as filler. This study was developed to compare the ability of sound absorption based on treated filler and particle size of wood dust. By choosing the size of 355 μm, three different percentage has been selected which is 10%, 15% and 20% for both conditions. These samples has been tested by using Impedance Tube test according to ASTM E-1050 for s

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12

Tiuc, Ancuta Elena, Ovidiu Vasile, Horatiu Vermesan, and Platon Mihai Andrei. "Sound Absorbing Insulating Composites Based on Polyurethane Foam and Waste Materials." Materiale Plastice 55, no. 3 (2018): 419–22. http://dx.doi.org/10.37358/mp.18.3.5041.

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The acoustic comfort includes the protection against noise and it is closely related to the sound absorption concept. This paper presents an experimental study on sound absorption coefficients, for some composite materials: waste materials (rubber crumbs, textile, flax fibers) mixed with rigid polyurethane foam as binder. The composite materials were characterized both acoustically (sound absorption coefficient) and also in terms of heat transfer (thermal conductivity). The acoustic absorption coefficient was determined using the impedance tube and the influence of structure of these materials

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13

Okamoto, Noriko, Toru Otsru, Reiji Tomiku, Masahiro Masuda, and Arisa Tabaru. "Calculation of statistical absorption coefficient using ensemble averaged surface normal impedance of material." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (2021): 5578–83. http://dx.doi.org/10.3397/in-2021-3163.

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To predict and control the indoor sound field, it is important to comprehend sound absorption characteristics of building materials. In the previous studies, the authors have proposed an in-situ sound absorption measurement method of materials using ensemble averaging technique, namely EA method. The method yields a simple and efficient in-situ measurement of surface normal impedance of materials at random-incidence. In this paper, the authors calculate the statistical absorption coefficient using the surface normal impedance of material by the EA method to obtain random incidence absorption c

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MT, Yusrizal, Muhammad Ali, Nuzuli Fitriadi, Irwansyah Syam, Balkhaya, and Hardi Susanto. "Marble Powder Blended Utilization Polyurethane as Soundproof Materials." Jurnal Inotera 6, no. 1 (2021): 30–36. http://dx.doi.org/10.31572/inotera.vol6.iss1.2021.id131.

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As technology advances, the development of equipment used by humans is increasing and most of the equipment produces unwanted sounds that cause noise. To overcome this, an alternative material for soundproofing is needed which is relatively cheap and easily available in the community by using marble powder as a polyurethane mixture in soundproof panels. The purpose of this study was to determine the effect of the sound absorption coefficient value and to determine the relationship between the frequency of the sound source and the sound absorption coefficient of acoustic materials using marble

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15

He, Liyan, Chenxi Li, Ying Hu, Haitao Wang, Qing Ran, and Haiquan Wu. "Sound absorption of a thick micro-perforated panel with tapered sections." Noise Control Engineering Journal 69, no. 4 (2021): 331–40. http://dx.doi.org/10.3397/1/376930.

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This article aims to investigate the sound absorbing properties of a thick microperforated panel (MPP) with tapered sections with finite element analysis (FEA) models. The FEA model was validated by using the measured sound absorption coefficients of a classic MPP sample and a proposed MPP sample. The FEA simulation and the experiments indicate that the tapered section can enhance the sound absorption coefficient. Moreover, the FEA model shows that the structural parameters of the tapered section can be optimized. The resonance frequency of the sound absorption coefficient moves to the high-fr

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16

Satwiko, Prasasto, Verza Dillano Gharata, Herybert Setyabudi, and Fefen Suhedi. "Enhancing egg cartons’ sound absorption coefficient with recycled materials." Building Acoustics 24, no. 2 (2017): 115–31. http://dx.doi.org/10.1177/1351010x17709986.

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Egg cartons have popularly been used as sound absorbers because they are inexpensive, easy to install and easily available. However, acoustic experts have demonstrated that egg cartons are bad sound absorbers. This study developed Enhanced Egg Carton – Dry and Enhanced Egg Carton – Wet using additional recycled materials (shredded rice straw paper, textile waste, 2-cm cut rice straws) to improve the cartons’ sound absorption coefficient while retaining their original advantages. Enhanced Egg Carton – Dry and Enhanced Egg Carton – Wet were tested based on the ASTM C423-02 method of sound absorp

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17

Chen, Jin Jing, and Zheng Guo. "The Acoustic Insulation Property of a New Non-Woven Material." Advanced Materials Research 194-196 (February 2011): 471–75. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.471.

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The acoustic insulation and hydrophobic properties of a new non-woven material were analyzed and discussed in this paper. The new non-woven material absorbs sound energy to transfer into heat energy by friction between viscosity of air near fiber and fiber. The acoustic insulation properties of the new non-woven material, polyurethane foam and felt were measured. With the same thickness and half weight of felt, the sound absorption coefficient of non-woven was 20~30% higher than felt. Further more, with the same weight of felt, the sound absorption coefficient of non-woven was50~60% higher tha

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18

Yu, Xingchen, and Xiaowei Li. "Sound Recognition Method of Coal Mine Gas and Coal Dust Explosion Based on GoogLeNet." Entropy 25, no. 3 (2023): 412. http://dx.doi.org/10.3390/e25030412.

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To solve the problems of backward means of coal mine gas and coal dust explosion monitoring, late reporting, and low leakage rate, a sound recognition method of coal mine gas and coal dust explosion based on GoogLeNet was proposed. After installing mining pickups in key monitoring areas of coal mines to collect the sounds of the working equipment and the environment, the collected sound was analyzed by continuous wavelet to obtain its scale coefficient map. This was then imported into GoogLeNet to obtain the recognition model of coal mine gas and coal dust explosions. The test sound was obtain

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Murzinov, Valery, Pavel Murzinov, Sergey Popov, and Julia Taratinova. "SOUND ABSORPTION OF SOUND SUPRESSING LIGHTWEIGHT STRUCTURED PANELS." Akustika 34 (November 1, 2019): 40–43. http://dx.doi.org/10.36336/akustika20193440.

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Description of the effective soundproofing panel is presented. For this panel, the ratio of acoustic characteristics and surface density exceeds many modern sound insulation and sound absorbing materials and structures. This article is devoted to modeling the sound absorption coefficient of the soundproof panel. The article presents formulas for determining the coefficient of sound absorption. Construction of a sound suppressed lightweight structured panel (SSLSP) developed by the authors is shown. Comparison of the effectiveness of the SSLSP panel and modern sound-proof materials is shown.

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20

Suhaemi, Thamrin, Seni H. J. Tongkukut, and As'ari . "Koefisien Serap Bunyi Papan Partikel Dari Bahan Serbuk Kayu Kelapa." Jurnal MIPA 2, no. 1 (2013): 56. http://dx.doi.org/10.35799/jm.2.1.2013.961.

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Telah dilakukan penelitian untuk mengetahui karakteristik koefisien serap bunyi papan partikel dari bahan dasar serbuk kayu kelapa. Papan partikel dibuat dengan mencampur serbuk kayu kelapa dengan tepung kanji, dicetak, dan dikeringkan. Sampel berbentuk silinder, dibuat sebanyak 4 buah dengan tebal : (1,15 cm), (1,95 cm), (2,95 cm) dan (4,05 cm). Nilai koefisien serap bunyi sampel diukur menggunakan alat ukur koefisien serap bunyi. Hasil penelitian menunjukkan, ketebalan sampel mempengaruhi nilai koefisien serap bunyi (α) yaitu pada frekuensi 600 Hz. Koefisien serap bunyi (α) semakin menurun d

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LE, Liang, Yu HUANG, Weikang JIANG, Ke NI, and Haijun WU. "Whistle or squeal? Distinguish and evaluate two typical abnormal sounds of collaborative robots." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 7 (2024): 4379–88. http://dx.doi.org/10.3397/in_2024_3452.

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The whistle and squeal are two typical abnormal sounds among the radiated noise of running collaborative robots, indicating potential faults and causing discomfort through auditory perception. This study investigated whether psychoacoustic parameters for sound quality could distinguish the whistle and squeal and evaluate their discomfort. A total of 20 abnormal sound stimuli, including 6 whistles and 14 squeals, were obtained from various collaborative robots. The cepstrum characteristics and sound quality metrics (i.e., roughness, sharpness, fluctuation strength and tonality) of all stimuli w

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Widayani, A. Noeriman, T. D. K. Wungu, and D. R. Adhika. "Sound Absorption Characterisation of Layered Arrangements of Pineapple Leaf Fiber-Epoxy Composite prepared by a Simple Mixing – Hot Pressing Process." Journal of Physics: Conference Series 2243, no. 1 (2022): 012047. http://dx.doi.org/10.1088/1742-6596/2243/1/012047.

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Abstract As with other natural fiber-based composites, pineapple leaf fiber-epoxy composites could be potentially used as sound absorber materials. Sound absorption coefficient of a material depends on several factors, such as thickness and sound frequency. Layered arrangement is usually used to increase thickness. In this research, sound absorption characteristic of one-, two- and three-layer arrangement of the Pineapple leaf fiber-epoxy composite containing 11 and 17% (w/w) of epoxy concentration have been studied. The composites were prepared by a simple mixing followed by hot pressing proc

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Kang, Chun-Won, Nam-Ho Lee, Sang-Sik Jang, and Ho-Yang Kang. "Sound Absorption Coefficient and Sound Transmission Loss of Rice Hull Mat." Journal of the Korean Wood Science and Technology 47, no. 3 (2019): 290–98. http://dx.doi.org/10.5658/wood.2019.47.3.290.

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Mania, Przemysław, Artur Flach, and Marta Pilarska. "Sound Wave Absorption Coefficient and Sound Velocity in Thermally Modified Wood." Applied Sciences 13, no. 14 (2023): 8136. http://dx.doi.org/10.3390/app13148136.

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The present work analyses the absorption coefficient of sound waves and the speed of sound propagation in thermally modified wood. The high resistance to weathering, fungi, and better dimensional stability, and therefore the broad physical properties of this material, are well known. However, the literature lacks numerous analyses of its acoustic characteristics. During the study, high-density species, such as oak, red oak, and beech were used, in contrast to pine. Pine wood during this test was characterised by a most rapid increase in the sound absorption coefficient value, in the range of 1

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Aleshkin, Vasily, Christofor Schirjetsky, and Anton Subbotkin. "ESTIMATING SOUND ABSORPTION IN COEFFICIENT OF PRAYERS IN MOSCQUES." Akustika 32 (March 1, 2019): 227–30. http://dx.doi.org/10.36336/akustika201932227.

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The article deals with analysing sound absorption of prayers in big congregational mosques. Peculiarity of sound absorption measurement in prayer halls is linked with the capability of mosque worshipers to pray in different poses with diverse arrangements as opposed to the traditional halls where people usually sit in chairs. This factor has a strong influence over the sound absorption coefficient which should be taken into account in acoustical design of such buildings. Within the framework of this study sound absorption coefficients (SAC) were measured using reverberation room method for peo

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Brodin, G., and L. Stenflo. "Nonlinear wave interactions of kinetic sound waves." Annales Geophysicae 33, no. 8 (2015): 1007–10. http://dx.doi.org/10.5194/angeo-33-1007-2015.

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Abstract. We reconsider the nonlinear resonant interaction between three electrostatic waves in a magnetized plasma. The general coupling coefficients derived from kinetic theory are reduced here to the low-frequency limit. The main contribution to the coupling coefficient we find in this way agrees with the coefficient recently presented in Annales Geophysicae. But we also deduce another contribution which sometimes can be important, and which qualitatively agrees with that of an even more recent paper. We have thus demonstrated how results derived from fluid theory can be improved and genera

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Heimes, Anne, and Michael Vorlaender. "A new approach for auralization of scattering in urban spaces." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A183. http://dx.doi.org/10.1121/10.0018594.

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Absorption and scattering coefficients of surfaces are crucial for acoustic propagation simulations. The scattering coefficient according to ISO 17497-1, however, is the most uncertain standard metric applied in geometrical acoustics. In outdoor sound propagation simulation, the amount of scattered energy is crucial for the sound immission at the receiver. Standard random-incidence scattering coefficients are in use but with uncertain results. In contrast, specific reflection patterns are neither available nor implemented in simulation algorithms. In this paper, the scattering coefficient conc

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Sandi, Sandi, Kumalasari Kumalasari, Jefri Akbar, Rospita Sari, and Fitri Afriani. "Pengukuran Koefisien Serapan Bunyi Spons dan Styrofoam dengan Menggunakan Smartphone." Jurnal Riset Fisika Indonesia 1, no. 1 (2020): 13–16. http://dx.doi.org/10.33019/jrfi.v1i1.2011.

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In this study, we analyzed the characteristics of samples sound absorption coefficient from sponge and styrofoam using a smartphone. The sound absorption coefficient is measured using a sound level meter and a frequency generator installed on a smartphone to determine the sound absorption coefficient. Samples were formed in circles with different thickness variations ranging from 1.5 cm to 15 cm. Through the tests that have been done, it can be seen that styrofoam has a higher sound absorption coefficient value than sponges. This research provides an alternative solution for measuring the soun

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Sakamoto, Shuichi, Kentaro Toda, Shotaro Seino, Kohta Hoshiyama, and Takamasa Satoh. "Theoretical and Experimental Analyses on the Sound Absorption Coefficient of Rice and Buckwheat Husks Based on Micro-CT Scan Data." Materials 16, no. 16 (2023): 5671. http://dx.doi.org/10.3390/ma16165671.

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In this study, the sound absorption coefficients of rice and buckwheat husks were estimated. Computed tomography (CT) images were processed to determine the circumference and surface area of voids in the granular material, and the normal incident sound absorption coefficients were derived. In addition, the tortuosity, which expresses the complexity of the sound wave propagation through the structure, was measured for each material. The theoretical sound absorption coefficients were then compared to the measured sound absorption coefficients with and without consideration of the tortuosity. A c

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Dupont, Samuel, Maryna Sanalatii, Manuel Melon, Olivier Robin, Alain Berry, and Jean-Christophe Le Roux. "Measurement of the diffuse field sound absorption using a sound field synthesis method." Acta Acustica 7 (2023): 26. http://dx.doi.org/10.1051/aacus/2023021.

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A method for measuring the diffuse field sound absorption coefficient of a material using sound field synthesis is proposed. A planar loudspeaker array is first used to generate acoustic plane waves with variable incidence angle on the surface of a material under test. Using a two-microphone probe positioned closely to the sample’s surface, the angle-dependent sound absorption coefficients are then estimated. Finally, the diffuse field absorption coefficient is computed following Paris formula. Numerical simulations are used to evaluate the respective effects of the maximum incidence angle val

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Li, Xiaolong, Junfeng Gao, Hui Du, Jingpeng Jia, Xiaojie Zhao, and Tianqing Ling. "Relationship between the Void and Sound Absorption Characteristics of Epoxy Porous Asphalt Mixture Based on CT." Coatings 12, no. 3 (2022): 328. http://dx.doi.org/10.3390/coatings12030328.

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This study investigates the relationship between the void characteristics and sound absorption characteristics of an epoxy porous asphalt mixture. The specimens are scanned and reconstructed under different void fractions using X-ray computed tomography (CT) technology and digital image processing, and the sound absorption coefficients at different frequencies are obtained using an acoustic impedance tube. The relationship between void characteristics and sound absorption characteristics is analyzed using gray correlation. The test results exhibited a good correlation between the void characte

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32

Yang, Yan, Xian Feng Huang, and Jun Liu. "Discussion on the Sound Radiation Coefficient of Building Materials." Advanced Materials Research 446-449 (January 2012): 1325–28. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1325.

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According to the definition of the sound radiation, a theoretical model is developed for acoustic radiation from a plate into air space. Then, the calculation for acoustic radiation coefficient at different frequencies and critical frequency of building members are carried out, also the radiation coefficient curves varied with frequency are gained. Comparison with the results of the radiation coefficient with different thicknesses and materials, the results show that: the sound radiation coefficient is so low to be neglected below the critical frequency; while it tends to a constant value of 1

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Khrystoslavenko, Olga, and Raimondas Grubliauskas. "Experimental Studies of the Sound Scattering Coefficient of the Diffuser in the Reverberation Chamber." Environmental and Climate Technologies 27, no. 1 (2023): 464–75. http://dx.doi.org/10.2478/rtuect-2023-0034.

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Abstract Wood charcoal is a sustainable, renewable, and environmentally friendly material with the use that the acoustic device can produce. Charcoal made of wood waste materials allows for improving indoor acoustical quality. Therefore, this objective of the article is to investigate the sound scattering coefficients of QRD with the perforation ratio of oak wood charcoal elements. Sound scattering coefficient calculated with the measurement of the reverberation time in the reverberation chamber. The calculation results of the scattering coefficient show the growth of scattering in the frequen

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Astrauskas, Tomas, Tomas Januševičius, and Raimondas Grubliauskas. "Acoustic Panels Made of Paper Sludge and Clay Composites." Sustainability 13, no. 2 (2021): 637. http://dx.doi.org/10.3390/su13020637.

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Studies on recycled materials emerged during recent years. This paper investigates samples’ sound absorption properties for panels fabricated of a mixture of paper sludge (PS) and clay mixture. PS was the core material. The sound absorption was measured. We also consider the influence of an air gap between panels and rigid backing. Different air gaps (50, 100, 150, 200 mm) simulate existing acoustic panel systems. Finally, the PS and clay composite panel sound absorption coefficients are compared to those for a typical commercial absorptive ceiling panel. The average sound absorption coefficie

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Astrauskas, Tomas, Tomas Januševičius, and Raimondas Grubliauskas. "Acoustic Panels Made of Paper Sludge and Clay Composites." Sustainability 13, no. 2 (2021): 637. http://dx.doi.org/10.3390/su13020637.

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Studies on recycled materials emerged during recent years. This paper investigates samples’ sound absorption properties for panels fabricated of a mixture of paper sludge (PS) and clay mixture. PS was the core material. The sound absorption was measured. We also consider the influence of an air gap between panels and rigid backing. Different air gaps (50, 100, 150, 200 mm) simulate existing acoustic panel systems. Finally, the PS and clay composite panel sound absorption coefficients are compared to those for a typical commercial absorptive ceiling panel. The average sound absorption coefficie

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Zhou, Yuhao, Si Chen, Haiyan Fu, Sarah Mohrmann, and Zheng Wang. "Sound absorption performance of light-frame timber construction wall based on Helmholtz resonator." BioResources 17, no. 2 (2022): 2652–66. http://dx.doi.org/10.15376/biores.17.2.2652-2666.

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In order to improve the sound absorption performance of the light-frame timber construction wall, this paper combined the aperture embedded wall unit structure with the actual building wall structure based on the Helmholtz resonance structure principle to design and fabricate two sets of wall structures: a new aperture embedded Helmholtz resonance structure (experimental group) and a conventional structure (control group). The sound absorption coefficients of the two wall structures were measured by the reverberation chamber test, and related analysis was carried out. The results showed that t

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Bimara, Billy Cessar, Aulia Rahma Azizah, Tri Anita Wulansari, Upik Nurbaiti, and Fianti Fianti. "ANALISIS MATERIAL SERAT ALAM TEBU SEBAGAI BAHAN PEREDAM SUARA." Jurnal Fisika : Fisika Sains dan Aplikasinya 6, no. 2 (2021): 97–100. http://dx.doi.org/10.35508/fisa.v6i2.6839.

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Abstract  Material Sugarcane natural fiber material can be used as a sound absorber material. In measuring the value of the sound absorption coefficient of the cane natural fiber silencer using the sound level meter application on the smartphone to measure the intensity of sound (dB) and the frequency generator application connected to the speaker as a sound source (Hz). The test uses an acoustic box as a miniature room that will be tested for its sound absorption coefficient values coated with sugarcane natural fibers. The purpose of this study is to find out the influence of sugarcane

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Oh, Yang Ki, and Min Woo Kang. "Sound absorption coefficient measurement for various building elements." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A311—A312. http://dx.doi.org/10.1121/10.0023636.

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The current sound absorption coefficient testing measurement method, ISO 354, primarily focuses on materials used for surface coverings or equivalent sound absorption objects. However, there are other building elements such as lightweight partition walls and windows that do not have solid structures behind them. These elements may allow sound to transmit to adjacent interior spaces or escape to the outside. On the other hand, the transmitted sound is expected to be rebounded into the measurement room when the test material is placed on a hard and thick surface as described in ISO 354. The test

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Di, Nayan, Muhammad Zahid Sharif, Zongwen Hu, Renjie Xue, and Baizhong Yu. "Applicability of VGGish embedding in bee colony monitoring: comparison with MFCC in colony sound classification." PeerJ 11 (January 26, 2023): e14696. http://dx.doi.org/10.7717/peerj.14696.

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Background Bee colony sound is a continuous, low-frequency buzzing sound that varies with the environment or the colony’s behavior and is considered meaningful. Bees use sounds to communicate within the hive, and bee colony sounds investigation can reveal helpful information about the circumstances in the colony. Therefore, one crucial step in analyzing bee colony sounds is to extract appropriate acoustic feature. Methods This article uses VGGish (a visual geometry group—like audio classification model) embedding and Mel-frequency Cepstral Coefficient (MFCC) generated from three bee colony sou

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Arai, Hiroto, Gen Sato, and Yusuke Ikeda. "Data-driven estimation of sound absorption coefficients considering the positions of microphones." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 1 (2023): 7050–55. http://dx.doi.org/10.3397/in_2023_1054.

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The sound absorption coefficient of walls is important to simulate the sound reflections in a room. However, measuring the sound absorption coefficients in detail requires many measurement points along the wall surface. Recently, machine-learning-based estimation methods have been proposed for the sound absorption coefficients using the room impulse responses as training data. In this study, to obtain the sound absorption coefficients of each wall surface with free microphone placement, we proposed the machine learning-based estimation with the room transfer functions and its measurement posit

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Isihara, A. "Attenuation coefficient of first sound in liquidHe4." Physical Review B 40, no. 1 (1989): 698–99. http://dx.doi.org/10.1103/physrevb.40.698.

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Azad, Hassan, and Gary W. Siebein. "On the prediction of sound diffusion coefficient." Journal of the Acoustical Society of America 143, no. 3 (2018): 1896. http://dx.doi.org/10.1121/1.5036168.

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Izewska, Anna. "Measurement uncertainty of the sound absorption coefficient." Journal of the Acoustical Society of America 123, no. 5 (2008): 3501. http://dx.doi.org/10.1121/1.2934375.

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Bucciarelli, F., and M. Meo. "Broadening sound absorption coefficient with hybrid resonances." Applied Acoustics 160 (March 2020): 107136. http://dx.doi.org/10.1016/j.apacoust.2019.107136.

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Kan, Guangming, Junjie Lu, Xiangmei Meng, et al. "Prediction Model of the Sound Speed of Seafloor Sediments on the Continental Shelf of the East China Sea Based on Empirical Equations." Journal of Marine Science and Engineering 12, no. 1 (2023): 27. http://dx.doi.org/10.3390/jmse12010027.

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Based on the data of the acoustic and physical properties of seafloor sediments obtained on the continental shelf area of the East China Sea (ECS), prediction equations of the sediment sound speed based on single and dual parameters were established, and the correlation of the sound speed with physical parameters was discussed. The results show that the sediment sound speed (c) is strongly correlated with water content (w), density (ρ), void ratio (e), mean grain size (Mz) and median grain size (Md), and the coefficient of determination R2 of the empirical regression equation is generally grea

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Liang, Li Si, Xiao Lei Wu, Na Ni Ma, Jin Jing Du, and Man Bo Liu. "The Sound Absorption Properties Comparison of Metal Foams and Flexible Cellular Materials." Materials Science Forum 933 (October 2018): 357–66. http://dx.doi.org/10.4028/www.scientific.net/msf.933.357.

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The third octave sound absorption coefficient testing is conducted to compare the sound absorption properties metal foam and flexible cellular materials, by using sound absorption tester with the method of trasfer function sound absorption tester with the method of trasfer function. The sound absorption mechanisms are discussed by changing the parameters of sound absorption structure, such as the thickness of matrix materials and the thickness of cavity. The results show that pearl wool and glass wool exhibited excellent sound absorption properties. The peak value of sound absorption coefficie

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Dlhý, Dušan, and Alena Pernišová. "The Dispersion of Acoustic Energy in the Dissemination from the Source." Advanced Materials Research 899 (February 2014): 513–16. http://dx.doi.org/10.4028/www.scientific.net/amr.899.513.

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Methodology of the way of supposed sound levels calculations in closed objects areas from the sound sources is based on assumptions, that the propagation of sound is dominant. In many cases the acoustic properties of space of sound propagation have great importance. We have to take in the consideration - the size and cross-section areas of dispersion bodies, their sound absorption coefficient; - shape of area and boundary areas absorption; - position of concerning point in relation to the source position in space; - noise of technological equipment and relatively other coefficients that may ef

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Ismail, Ismail, Zakiul Fuady, Fauzi Fauzi, and Zulfian Zulfian. "Acoustic properties of gypsum-palm panel and foam concrete-palm panel." Journal of Aceh Physics Society 14, no. 1 (2025): 1–8. https://doi.org/10.24815/jacps.v14i1.40062.

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This study aims to determine the acoustic properties of gypsum panel, gypsum-ijuk panel, ijuk-gypsum panel, foam concrete panel, and foam concrete-ijuk panel. The size of panel was 1 m x 1 m with a thickness of 0.02 - 0.03 m. The measurement of the sound absorption coefficient was carried out using the reverberation chamber method (ISO 354-1985) for the frequency range of 125 – 4000 Hz. The results showed that the sound absorption coefficient fluctuated with frequency. Gypsum panel has the highest sound absorption coefficient of 0.42 at 125 Hz and the lowest 0.05 at 400 Hz. Ijuk panel has the

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Tudor, Eugenia Mariana, Anna Dettendorfer, Günther Kain, Marius Catalin Barbu, Roman Réh, and Ľuboš Krišťák. "Sound-Absorption Coefficient of Bark-Based Insulation Panels." Polymers 12, no. 5 (2020): 1012. http://dx.doi.org/10.3390/polym12051012.

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The objective of this study was to investigate the sound absorption coefficient of bark-based insulation panels made of softwood barks Spruce (Picea abies (L.) H. Karst.) and Larch (Larix decidua Mill.) by means of impedance tube, with a frequency range between 125 and 4000 Hz. The highest efficiency of sound absorption was recorded for spruce bark-based insulation boards bonded with urea-formaldehyde resin, at a level of 1000 and 2000 Hz. The potential of noise reduction of larch bark-based panels glued with tannin-based adhesive covers the same frequency interval. The experimental results sh

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Farid, Mohammad, Agung Purniawan, Diah Susanti, Amaliya Rasyida, Henry Yulianto, and Mavindra Ramadani. "Effect of Nanocellulose on Acoustical and Thermal Insulation Properties of Silicone Rubber Composite." Materials Science Forum 964 (July 2019): 156–60. http://dx.doi.org/10.4028/www.scientific.net/msf.964.156.

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Nanocellulose composites are very potential to be applied as automotive component materials.The purpose of this research is to analyze the influence of nanocellulose fraction of the silicon rubber composite material to morphology, sound absorption coefficient, density, thermal stability, and thermal conductivity. The nanocellulose of the composites were isolated from oil palm empty fruit bunch, while the matrix was silicone rubber. Tests conducted in this research included sound absorption coefficient, SEM, TGA, density, and thermal conductivity. Sound absorption coefficient had a value betwee

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