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Journal articles on the topic 'Acoustic absorber'

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Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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1

Herlina Sari, Nasmi, and Jauhar Fajrin. "Acoustic Properties of Sound Absorber from Modified Polyester with Filler Sodium Bicarbonate." Oriental Journal of Chemistry 34, no. 4 (August 25, 2018): 2187–91. http://dx.doi.org/10.13005/ojc/3404061.

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The combination of low price, ease of manufacturing and waterproofing characteristics has placed polyester resin as a potential sound absorbent material. Previous studies showed that adding filler material to the blending may increase the acoustics properties of a sound absorbent material. This study aims to investigate the potential of sodium bicarbonate (NaHCO3) to be employed as a filler to improve the acoustic properties of the sound absorber made of polyester resin. Two important acoustic parameters were carefully assessed; absorption coefficient and acoustic impedance. The results showed that the sound absorption performance increased significantly at low and medium frequencies in the presence of NaHCO3 filler in polyester resin. Meanwhile, the use of a back cavity on the absorbent material reduced the sound absorption performance of materials at low and medium frequencies. This suggests that sound absorber made of polyester with sodium bicarbonate filler may be used as an alternative for sound absorber materials.
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2

Xu, Weikai, Yingchun Tang, Meng Zhang, Wuchao Qi, and Wei Wang. "Arbitrary shaped acoustic omnidirectional absorber based on transformation theory." International Journal of Modern Physics B 34, no. 11 (April 30, 2020): 2050111. http://dx.doi.org/10.1142/s0217979220501118.

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In this study, an arbitrary shaped acoustic omnidirectional absorber (AOA) is achieved for absorbing incoming acoustic/elastic waves in the ambient environment. Using the transformation acoustics theory, we present a theoretical framework for two-dimensional acoustic path guidance around arbitrary shapes for which the material parameters in the transformed space can be obtained analytically. Results indicate that the transformed space is distorted rather than compressed; numerical simulations confirm that these absorbers exhibit a remarkably large absorption and that the proposed method can control acoustic absorption for arbitrary geometries of interest. This method can potentially be applied to sound absorption and noise control.
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3

Putra, Azma, D. Hafizah, M. Y. Yaakob, and Mohd Jailani Mohd Nor. "Study on the Use of Micro-Perforated Panel to Improve Acoustic Performance in Mosque." Applied Mechanics and Materials 393 (September 2013): 971–75. http://dx.doi.org/10.4028/www.scientific.net/amm.393.971.

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Most activities in mosque such as Friday prayer and the sermon by an Imam require clarity of speech. Unfortunately, this speech intelligibility performance is often poor due to initial design of a mosque. This paper presents assessment of the indoor acoustics of a mosque. Acoustical properties such as reverberation time, clarity and early decay time are obtained from simulation data using CATT indoor acoustic software. The study started with an empty mosque with no acoustic treatment. Acoustic green absorbers using micro-perforated panel (MPP) are then introduced to improve the acoustic performance. The application of MPP is still rare for mosque and is expected to replace the typical porous absorber. The effect of the panel size, location and frequency range of sound absorption are simulated and the results are discussed.
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4

Halama, Jakub, Milan Klapka, and Ivan Mazůrek. "Experimental Methodology for Acoustic Diagnostics of Shock Absorbers." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 66, no. 5 (2018): 1119–25. http://dx.doi.org/10.11118/actaun201866051119.

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The application of acoustic measurements brings about a new diagnostic method for evaluating the conditions of shock absorbers. In shock absorber diagnostics, it is advantageous to observe and understand what phenomena occur during the working cycle in the inner tube. Using a non‑destructive and non‑contact method can avoid dismantling whole device. For the research of this new acoustic method, a classic sound meter, an automotive and a train shock absorber were used. FFT analysis and concurrent filtration were applied for the measurement evaluation of obtained data. It has been proven that applying acoustic methods can lead to diagnostics of aeration in the shock absorbers. A defective shock absorber changes its damping characteristics as well as noise radiation compared with the properly functioning one; these differences in noise are measurable and quantifiable. The results show that characteristics of acoustic radiation of the aerated shock absorbers relate to the shock construction type.
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5

Liu, Xingxing, Xiang Li, and Zhiying Ren. "Miniaturized Spiral Metamaterial Array for a Ventilated Broadband Acoustic Absorber." Shock and Vibration 2020 (November 2, 2020): 1–6. http://dx.doi.org/10.1155/2020/8887571.

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The high-efficiency and broadband acoustic reduction performance in a miniaturized free-flow structure remains challenging in acoustic engineering applications due to the contradiction of ventilation and acoustic reduction performance. Traditional acoustic absorbers can sufficiently attenuate acoustic wave, but meanwhile, block fluid flow due to the longitudinal nature of acoustic waves that can transmit among any small holes. Although different types of ventilated metamaterial absorbers (VMAs) with proper reduction and ventilation performance have been demonstrated recently, their insufficiencies lie in small open-area ratios, not efficient-enough reduction performance, bulky structure, and narrow working band. To further solve existing defects, a ventilated broadband absorber with the miniaturized metamaterial structure has been proposed. The designed absorber consists of miniaturized Archimedean spiral units, which can be easily stacked to achieve broadband and ventilated performance. This work opens up possibilities for practical acoustic applications where both noise control and ventilation are required, especially in a small space.
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6

Lerner, Lawrence, and Stephen P. Diskin. "Portable adjustable acoustic absorber." Journal of the Acoustical Society of America 83, no. 2 (February 1988): 845–46. http://dx.doi.org/10.1121/1.396070.

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7

Naify, Christina J., Theodore P. Martin, Christopher N. Layman, Michael Nicholas, Abel L. Thangawng, David C. Calvo, and Gregory J. Orris. "Underwater acoustic omnidirectional absorber." Applied Physics Letters 104, no. 7 (February 17, 2014): 073505. http://dx.doi.org/10.1063/1.4865480.

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8

Wang, Heng, and Qibo Mao. "Development and Investigation of Fully Ventilated Deep Subwavelength Absorbers." Symmetry 13, no. 10 (October 1, 2021): 1835. http://dx.doi.org/10.3390/sym13101835.

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A new type of deep subwavelength acoustic metamaterial (AMM) absorber with 100% ventilation is presented in this study. The proposed ventilation absorber consists of coiled-up half-wave resonators (HWRs) and quarter-wave resonators (QWRs). First, the sound absorption and sound transmission performances for absorbers were analyzed considering the thermal viscosity dissipation. Then, the prototype with ten HWRs and three QWRs composed of acrylic plates was manufactured based on the theoretical model. The acoustic performance of the absorber was tested in an air-filled acoustic impedance tube to determine the sound absorption and transmission loss performances. Good agreement was found between the measured and theoretically predicted results. The experimental results show that the proposed ventilation AMM absorber is able to achieve sound absorption in a range between 330 Hz and 460 Hz with a thickness of only 32 mm (about 3% of the wavelength in the air). Furthermore, the sound transmission loss can achieve 17 dB from 330 Hz to 460 Hz. The main advantage of the proposed absorber is that it can be completely ventilated in duct noise control.
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9

El-Raheb, M., and P. Wagner. "Damped Response of Shells by a Constrained Viscoelastic Layer." Journal of Applied Mechanics 53, no. 4 (December 1, 1986): 902–8. http://dx.doi.org/10.1115/1.3171879.

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Vibration absorbers are introduced into an asymmetric configuration of thin cylinders and tori enclosing an acoustic medium. The absorbers consist of thin axial strips bonded to the cylinder with a thin viscoelastic layer. The constrained layer dissipates the energy of relative motions between strip and cylinder. The absorber is most effective on response modes with two or more circumferential waves. The use of transfer matrices is extended to the coupled cylinder-absorber system.
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10

Ng, C. F., and Qin Hao-Ming. "Double Perforated Honeycomb Panel as a Low Frequency Acoustic Absorber." Building Acoustics 4, no. 1 (March 1997): 21–37. http://dx.doi.org/10.1177/1351010x9700400102.

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This report deals with a theoretical and experimental study of the low frequency sound absorption characteristics of perforated honeycomb sandwich panels. The derivations of formulae for absorption in terms of double perforation ratio and air gap are presented. Results show that the honeycomb absorber, with double perforated sheets, can be an effective low frequency absorber for frequencies down to 63 Hz. In addition, honeycomb panels have advantages over other low frequency absorbers in that they are light weight and strong.
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11

Neil, Thomas R., Zhiyuan Shen, Daniel Robert, Bruce W. Drinkwater, and Marc W. Holderied. "Moth wings are acoustic metamaterials." Proceedings of the National Academy of Sciences 117, no. 49 (November 23, 2020): 31134–41. http://dx.doi.org/10.1073/pnas.2014531117.

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Metamaterials assemble multiple subwavelength elements to create structures with extraordinary physical properties (1–4). Optical metamaterials are rare in nature and no natural acoustic metamaterials are known. Here, we reveal that the intricate scale layer on moth wings forms a metamaterial ultrasound absorber (peak absorption = 72% of sound intensity at 78 kHz) that is 111 times thinner than the longest absorbed wavelength. Individual scales act as resonant (5) unit cells that are linked via a shared wing membrane to form this metamaterial, and collectively they generate hard-to-attain broadband deep-subwavelength absorption. Their collective absorption exceeds the sum of their individual contributions. This sound absorber provides moth wings with acoustic camouflage (6) against echolocating bats. It combines broadband absorption of all frequencies used by bats with light and ultrathin structures that meet aerodynamic constraints on wing weight and thickness. The morphological implementation seen in this evolved acoustic metamaterial reveals enticing ways to design high-performance noise mitigation devices.
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12

Liu, Le, Long-Xiang Xie, Weichun Huang, Xiu Juan Zhang, Ming-Hui Lu, and Yan-Feng Chen. "Broadband acoustic absorbing metamaterial via deep learning approach." Applied Physics Letters 120, no. 25 (June 20, 2022): 251701. http://dx.doi.org/10.1063/5.0097696.

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Sound absorption is important for room acoustics and remediation of noise. Acoustic metamaterials have recently emerged as one of the most promising platforms for sound absorption. However, the working bandwidth is severely limited because of the strong dispersion in the spectrum caused by local resonance. Utilizing the coupling effect among resonators can improve the absorbers' performance, but the requirement of collecting coupling effects among all resonators, not only the nearest-neighbor coupling, makes the system too complex to explore analytically. This Letter describes deep learning based acoustic metamaterials for achieving broadband sound absorption with no visible oscillation in a targeted frequency band. We numerically and experimentally achieve an average absorption coefficient larger than 97% within the ultra-broadband extending from 860 to 8000 Hz, proving the validity of the deep learning based acoustic metamaterials. The excellent ultra-broadband and near-perfect absorption performance allows the absorber for versatile applications in noise-control engineering and room acoustics. Our work also reveals the significance of modulating coupling effects among resonators, and the deep learning approach may blaze a trail in the design strategy of acoustic functional devices.
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13

Liu, Xiang, Chunqi Wang, Lixi Huang, and Keming Wu. "Experimental study of smart sound absorber using multimode electromechanical coupling control in the low-frequency range." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 3 (August 1, 2021): 3800–3810. http://dx.doi.org/10.3397/in-2021-2529.

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To construct a smart sound absorber in the low-frequency range with a wide control band, a piezoelectric ceramic (PZT) shunted with multiple resonance circuit is attached onto a micro-perforated panel (MPP) to perform as a smart sound absorber. The absorption can be controlled by the shunt circuit parameters conveniently. This smart micro-perforated panel (MPP) is investigated experimentally to explore the feasibility and design procedure in practical use. Based on the coupling among the acoustical, electrical, and mechanical fields, the proposed broadband sound absorber can achieve good acoustic performance on subwavelength scales. The electrical response of the shunt circuit is tested with a Network Analyzer. The acoustic performance of the smart sound absorber is measured in an impedance tube with the two-microphone transfer function method. The experimental results validate that the shunt circuit can resonate with the PZT patch at multiple frequencies, and hence improve the sound absorption of the smart absorber at these frequencies.
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14

Zhu, Yifan, and Badreddine Assouar. "Nonlocal acoustic metasurface absorber for ultra-broadband sound absorption." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (August 1, 2021): 5409–14. http://dx.doi.org/10.3397/in-2021-3086.

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Classical designs of acoustic meta-absorber usually have a trade-off between bandwidth, efficiency and thickness. Here, we introduce the concept of nonlocal acoustic metasurface absorber by using a bridge structure connecting resonating unit cells to improve the performances of the meta-absorber. By utilizing the coupling effect between the adjacent unit cells, ultra-broadband sound absorption is achieved with deep-wavelength thickness. The physical mechanism of the nonlocal acoustic metasurface absorber is investigated by developing analytical models. We theoretically and numerically study the nonlocal metasurface with connecting bridge and the traditional metasurface without bridge. The nonlocality can introduce three specific effects: 1. Optimizing of effective acoustic impedances. 2. Shift of Fabry-Perot resonant frequencies. 3. Strengthening of the coupling effects between adjacent unit cells. These effects help to improve the bandwidth and the efficiency of the acoustic meta-absorber. We numerically and experimentally achieve an averaged absorption coefficient larger than 0.9 within the ultra-broadband bandwidth from about 600 Hz to 2600 Hz, with a sample thickness of 6.8 cm, , /9 for the lowest frequency. Our finding demonstrates the advantage of non-local acoustic metasurface to conceive subwavelength sound meta-absorber.
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15

Khudiakova, Natalya, Aleksei Bykov, Alexandr Komkin, and Stanislav Sementsov. "Study of the Active Acoustic Absorber Based on a Shunted Loudspeaker." MATEC Web of Conferences 320 (2020): 00019. http://dx.doi.org/10.1051/matecconf/202032000019.

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The study looks at the active sound absorption system in which a loudspeaker with a shunting resistor is used as an absorber. A theoretical study of shunting element influence on the reviewed system absorption characteristics was performed. Results of experimental re-search of active acoustic absorbers are given.
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16

Konishi, Satoshi, Mitsuhiro Yoda, Susumu Sugiyama, and Sadao Akishita. "Tunable acoustic absorber using a micro acoustic hole array." Electronics and Communications in Japan (Part II: Electronics) 83, no. 1 (January 2000): 1–6. http://dx.doi.org/10.1002/(sici)1520-6432(200001)83:1<1::aid-ecjb1>3.0.co;2-r.

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17

Thomazelli, Rodolfo, and Stelamaris Bertoli. "An experimental study on the optimization of the production and efficiency of tunable Helmholtz absorbers for the modal control of small rooms." Building Acoustics 26, no. 2 (February 24, 2019): 69–91. http://dx.doi.org/10.1177/1351010x19829870.

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Helmholtz absorbers are a common solution for controlling the low-frequency modes found in small rooms. These devices only perform in a narrow spectrum range with the tuning depending on each room’s geometrical configurations. Consequently, their development still operates on a case-by-case basis. A possible alternative to optimize the production of these acoustic solutions is the development of a tunable Helmholtz absorber capable of changing its geometrical configurations according to each room’s acoustic needs. The present work shares the results of tests performed on varied samples of different configurations of absorbers. The samples were chosen aiming the control of the three first modes of each direction in rooms with volume ranging from 20 to 60 m3. The research revealed that the use of a single tunable absorber has the potential to produce sound absorption coefficients higher than 0.8 in almost the entirety of the frequency spectrum considered.
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18

Hicks, Ashley J., Michael R. Haberman, and Preston S. Wilson. "A thin-panel underwater acoustic absorber." Journal of the Acoustical Society of America 136, no. 4 (October 2014): 2098. http://dx.doi.org/10.1121/1.4899546.

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19

Lu, Zhenbo, Yongdong Cui, Marco Debiasi, and Zijie Zhao. "A Tunable Dielectric Elastomer Acoustic Absorber." Acta Acustica united with Acustica 101, no. 4 (July 1, 2015): 863–66. http://dx.doi.org/10.3813/aaa.918881.

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20

Wang, Changxian, Weibin Wen, Yixing Huang, Mingji Chen, Hongshuai Lei, and Daining Fang. "A novel broadband waterborne acoustic absorber." AIP Advances 6, no. 7 (July 2016): 075107. http://dx.doi.org/10.1063/1.4958924.

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21

Shao, Jianwang, Tao Zeng, and Xian Wu. "Study of a Nonlinear Membrane Absorber Applied to 3D Acoustic Cavity for Low Frequency Broadband Noise Control." Materials 12, no. 7 (April 8, 2019): 1138. http://dx.doi.org/10.3390/ma12071138.

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As a new approach to passive noise control in low frequency domain, the targeted energy transfer (TET) technique has been applied to the 3D fields of acoustics. The nonlinear membrane absorber based on the TET can reduce the low frequency noise inside the 3D acoustic cavity. The TET phenomenon inside the 3D acoustic cavity has firstly investigated by a two degrees-of-freedom (DOF) system, which is comprised by an acoustic mode and a nonlinear membrane without the pre-stress. In order to control the low frequency broadband noise inside 3D acoustic cavity and consider the influence of the pre-stress for the TET, a general model of the system with several acoustic modes of 3D acoustic cavity and one nonlinear membrane is built and studied in this paper. By using the harmonic balance method and the numerical method, the nonlinear normal modes and the forced responses are analyzed. Meanwhile, the influence of the pre-stress of the nonlinear membrane for the TET is investigated. The desired working zones of the nonlinear membrane absorber for the broadband noise are investigated. It can be helpful to design the nonlinear membrane according the dimension of 3D acoustic cavity to control the low frequency broadband noise.
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22

Liu, Lianyun, Yong Yu, Junlun Hu, Xu Zheng, Yi Qiu, and Zhiyong Hao. "Experimental study of acoustic superradiance from a rotating absorber." Journal of Applied Physics 131, no. 16 (April 28, 2022): 164901. http://dx.doi.org/10.1063/5.0086043.

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The concept that classic waves reflected from a rotating absorbing cylinder will be amplified is analogously linked to the Penrose superradiance that may extract energy from a rotating black hole. The superradiance of acoustic waves carrying orbital angular momentum (OAM) from a sound absorber has been demonstrated in a recently published experiment using two rotating microphones. The experiment showed that the waves were amplified by up to 30% when the rotation rate of the absorber satisfied the Zel’dovich condition. Here, we proposed an experimental method to detect acoustic superradiance by static microphones. We demonstrated that the acoustic waves transmitted through a perforated absorber were amplified (by up to 1000%) even when the Zel’dovich condition was not satisfied. The experiment also showed that when the Doppler-shifted frequency of an observer was 0 Hz, the acoustic amplitude was very weak regardless of the rotation rate of the absorber. Our work was worthwhile not only in the proposed experimental method that was well-suited for observing the acoustic OAM wave but also in the high amplification achieved at a low rotation rate of the perforated absorber, showing a great prospect in practical applications such as amplifying the information-carrying OAM waves for high-speed acoustic communication.
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23

Liu, Lianyun, Yong Yu, Junlun Hu, Xu Zheng, Yi Qiu, and Zhiyong Hao. "Experimental study of acoustic superradiance from a rotating absorber." Journal of Applied Physics 131, no. 16 (April 28, 2022): 164901. http://dx.doi.org/10.1063/5.0086043.

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The concept that classic waves reflected from a rotating absorbing cylinder will be amplified is analogously linked to the Penrose superradiance that may extract energy from a rotating black hole. The superradiance of acoustic waves carrying orbital angular momentum (OAM) from a sound absorber has been demonstrated in a recently published experiment using two rotating microphones. The experiment showed that the waves were amplified by up to 30% when the rotation rate of the absorber satisfied the Zel’dovich condition. Here, we proposed an experimental method to detect acoustic superradiance by static microphones. We demonstrated that the acoustic waves transmitted through a perforated absorber were amplified (by up to 1000%) even when the Zel’dovich condition was not satisfied. The experiment also showed that when the Doppler-shifted frequency of an observer was 0 Hz, the acoustic amplitude was very weak regardless of the rotation rate of the absorber. Our work was worthwhile not only in the proposed experimental method that was well-suited for observing the acoustic OAM wave but also in the high amplification achieved at a low rotation rate of the perforated absorber, showing a great prospect in practical applications such as amplifying the information-carrying OAM waves for high-speed acoustic communication.
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24

Prawirasasra, Muhammad Saladin. "EFFECT OF ACOUSTIC MATERIAL CEILING TO SPEECH PERFORMANCE OF CONVENTION HALL." ARSITEKTURA 16, no. 2 (October 31, 2018): 203. http://dx.doi.org/10.20961/arst.v16i2.22324.

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<p class="Abstract"><em>During design process of auditorium, mostly, acoustics design was neglected by engineers therefore it may cause inappropriate acoustic condition. Evaluation of acoustic comfort was carried out through measurement of speech parameters such as Noise rating (NR), reverberation time and definition (D<sub>50</sub>). According to measurement result, performance of convention hall is not sufficient to perform speech activities since it has 0.4-13.7 s of reverberation time and 1.6-42.6% of D50. To improve acoustic performance, modification is applied on ceiling materials using combination of two different acoustic materials – absorber and diffusor, through simulation.. The result has shown that installment of full absorber at ceiling with high absorbtive coefficient could reduce early energy reflection which causes lower reverberation time and higher definition. Whenever ceiling are made of combination of two type of materials, the position of di on ceiling depend on diffusor orientation. Spread diffusor has better performance rather than centralized diffusor. However, the acoustic performance of convention hall remains the same.</em></p><p class="Abstract"><em><br /></em></p>
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25

Samsudin, Emedya Murniwaty, Lokman Hakim Ismail, Aeslina Abd Kadir, Ida Norfaslia Nasidi, and Noor Sahidah Samsudin. "Rating of Sound Absorption for EFBMF Acoustic Panels according to ISO 11654:1997." MATEC Web of Conferences 150 (2018): 03002. http://dx.doi.org/10.1051/matecconf/201815003002.

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Empty fruit bunch fibre (EFB) and mesocarp fibre (MF) have been used in the fabrication of a new acoustic panel as a sound absorber for building. Measurements were carried out following ISO 354 in the mini reverberation chamber and the sound absorption performance of EFBMF acoustic panels were rated based on ISO 11654. Measurements of the new EFBMF acoustic panel involves five panel designs of 100 EFB dust panels, 80:20 dust panels, 100MF coir panels, 90:10 coir panels and 50:50 coir panels with 5 cm of initial thickness. Results showed that 100MF coir panel achieved αw of 0.90 coefficient and was rated as Class A absorber followed by 90:10 coir panels with αw of 0.85 coefficient and 100 EFB dust, 80:20 dust and 50:50 coir panels having αw of 0.80 coefficients and been rated as Class B absorber. This research has successfully defined that EFB and MF are viable to be used as raw fibre for acoustic absorber for building.
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26

Tang, Xiaoning, Deyi Kong, and Xiong Yan. "Multiple regression analysis of a woven fabric sound absorber." Textile Research Journal 89, no. 5 (February 15, 2018): 855–66. http://dx.doi.org/10.1177/0040517518758001.

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In this study, the effects of physical parameters on the acoustic absorption properties of woven fabrics were studied. The acoustic absorption properties of 24 kinds of woven fabrics with different structural parameters were measured and analyzed. Multiple linear regression models have been established to characterize the relationship between acoustic behavior and various physical parameters. It has been found that the acoustic absorption properties were mainly determined by the perforation ratio and air permeability. The decrease in perforation ratio and air permeability results in an increase of acoustic absorption properties of woven fabrics. Furthermore, three woven fabrics were used to validate the proposed multiple regression models. The established models could well predict the acoustic absorption properties of woven fabrics where the correlation coefficient is higher than 0.77 with air gaps of 1, 2, and 3 cm, respectively.
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27

Drotleff, Horst, Roman Wack, and Philip Leistner. "Absorption of Periodically Aligned Absorber Strips in Concrete Structures." Building Acoustics 16, no. 3 (September 2009): 233–56. http://dx.doi.org/10.1260/135101009789877022.

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At present, new buildings are frequently built by thermally active concrete ceilings due to the requirements of thermal comfort and energy saving. Thus sound absorbers (sails, baffles) are installed below the ceiling in order not to deteriorate thermal efficiency. This frequently collides with architectural design asking for planar surfaces. A periodic arrangement of sound-absorbent strips in concrete ceilings shows higher sound absorption than is to be expected from surface-averaged sound absorption. This is well known, since the ceiling behaves like an acoustic phase grating. The challenge for acoustic consultants is to design periodic ceiling structures in a way that the sound absorption is adequate to keep thermal losses as low as possible. Based on the so-called Rayleigh expansion, frequently published so far, a simple model was derived to predict sound absorption at normal, oblique and field incidence. The model was validated by means of measurements and calculations for two types of absorbers: a micro-perforated resonator and a porous absorber made of recycled glass. The measured and computed results comply at normal incidence, whereas discrepancy between measurement and calculation is clearly higher at field incidence. It is assumed that this behavior is mainly due to the edge effect. The findings of a demonstration project in situ are: Sound absorption achieved by means of periodic strips in concrete ceilings is adequate for usual office use, thermal losses are very low, but implementation at the construction site requires further improvement. Part of this text was previously published in the proceedings of INTER-NOISE 2008.
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28

Diduck, Murray F., Daneil A. Diduck, and Jeffrey M. Dehid. "Acoustic absorber, and method of manufacture thereof." Journal of the Acoustical Society of America 93, no. 3 (March 1993): 1674. http://dx.doi.org/10.1121/1.406770.

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29

Azbaid El Ouahabi, Abdelhalim, Victor V. Krylov, and Daniel J. O'Boy. "Quasi-flat acoustic absorber enhanced by metamaterials." Journal of the Acoustical Society of America 136, no. 4 (October 2014): 2076. http://dx.doi.org/10.1121/1.4899454.

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30

Braun, Hilarion, and Ralph E. Antolik. "External acoustic absorber for ink jet printer." Journal of the Acoustical Society of America 81, no. 6 (June 1987): 2002. http://dx.doi.org/10.1121/1.394736.

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31

Climente, Alfonso, Daniel Torrent, and José Sánchez-Dehesa. "Omnidirectional broadband acoustic absorber based on metamaterials." Applied Physics Letters 100, no. 14 (April 2, 2012): 144103. http://dx.doi.org/10.1063/1.3701611.

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32

Lu, Zhenbo, Yongdong Cui, Jian Zhu, Zijie Zhao, and Marco Debiasi. "Acoustic characteristics of a dielectric elastomer absorber." Journal of the Acoustical Society of America 134, no. 5 (November 2013): 4218. http://dx.doi.org/10.1121/1.4831489.

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33

Wang, Samw Hong Jen. "Acoustic absorber for absorbing noises in buildings." Journal of the Acoustical Society of America 113, no. 4 (2003): 1789. http://dx.doi.org/10.1121/1.1572350.

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34

Christian, J., Suprayogi, and N. Fitriyanti. "Absorber Geometry Size Optimization For Acoustic Anechoic Chamber Design Using Genetic Algorithm." Journal of Physics: Conference Series 2243, no. 1 (June 1, 2022): 012085. http://dx.doi.org/10.1088/1742-6596/2243/1/012085.

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Abstract An anechoic chamber is a room that is made to resemble the condition of empty space. This room has an absorption rate of 99%. The absorber is an essential part while manufacturing an anechoic chamber. In an anechoic chamber, absorber affects in terms of absorption and frequency range. Specification of the absorber used depends on the specification of the anechoic chamber to be made. The optimum absorber geometry size is required to maximize the net volume of the anechoic chamber. The maximum measurable object size is 0.05x net volume of an anechoic chamber. To overcome the problem, it is necessary to optimize the size of the absorber geometry. The size optimization of the absorber geometry has been carried out using a genetic algorithm with MATLAB as the programming software. The incidence angle of the wave and the width of the absorber are used as input parameters for absorber optimization. Absorber geometry size optimization results in an optimum peak angle and absorber length. The width of the absorber used in this optimization is 0.2 m. The peak angle obtained is 12.2° with a length of 0.936 m. The average absorption coefficient obtained is 0.886041.
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35

Xu, He, and Deyi Kong. "Sound absorption and insulation performance of a finite cylindrical micro-perforated panel absorber." Journal of the Acoustical Society of America 152, no. 4 (October 2022): 2382–97. http://dx.doi.org/10.1121/10.0014831.

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This paper describes the theoretical prediction, simulation research, and experimental verification conducted to understand the potential of finite cylindrical micro-perforated panel absorbers (FC-MPPAs) in noise control. The simplified Rayleigh integral method is extended to predict the dissipation of sound energy in cylindrical micro-perforations with sub-millimeter aperture. The sound absorption and insulation performance of a FC-MPPA and the influence of its structural parameters on its acoustic performance were studied by model simulation and experiment, and the directional distribution of the sound field was revealed. The simulation and experimental results show that the FC-MPPA has unique acoustic characteristics different from the panel-type absorber, and its structural parameters are closely related to the acoustic-energy dissipation efficiency. Moreover, the absorption coefficient of FC-MPPA is a function of the incidence angle and frequency of the sound wave, and its acoustic properties are controlled by the coupling between the micro-perforated panel and the acoustic modes in the annular cavity domain. These studies can provide help in the design and application of FC-MPPA to achieve better noise reduction effect.
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36

Yoshida, Takumi, Takeshi Okuzono, Yui Sugimoto, and Kimihiro Sakagami. "An explicit time-domain FEM for acoustic simulation in rooms with frequency-dependent impedance boundary: Comparison of performance in 2D simulation with frequency-domain FEM." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 5 (August 1, 2021): 1120–29. http://dx.doi.org/10.3397/in-2021-1757.

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Accurate boundary modelings that address the frequency-dependent sound absorption characteristics of various sound absorbers are crucial for wave-based room acoustic simulation. In time-domain simulations, however, a computationally demanding convolution appears in frequency-dependent impedance boundary conditions. The present paper proposes a room acoustic solver with a fourth-order accurate explicit TD-FEM, incorporating a frequency-dependent absorbing boundary condition efficiently using a recursive convolution method, namely the auxiliary differential equation (ADE) method. Its performance against the fourth-order accurate frequency-domain FEM is examined via 2D real-scale room acoustic problems, solving a sound propagation in an office room up to 4.5 kHz. Firstly, we describe briefly the formulation of the proposed room acoustics solver based on the explicit TD-FEM. Then, the discretization error property of the proposed method is evaluated via an impedance tube problem, including a frequency-dependent impedance boundary of porous sound absorber. Finally, the accuracy and efficiency of the proposed method are demonstrated with the comparison of frequency-domain FEM solver, which uses a sparse direct solver for the solution of the linear system at each frequency. Results showed the proposed method can perform an acoustic simulation with significantly low computational costs compared to the frequency-domain solver while keeping an acceptable level of accuracy.
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37

Neil, Thomas R., Zhiyuan Shen, Daniel Robert, Bruce W. Drinkwater, and Marc W. Holderied. "Thoracic scales of moths as a stealth coating against bat biosonar." Journal of The Royal Society Interface 17, no. 163 (February 2020): 20190692. http://dx.doi.org/10.1098/rsif.2019.0692.

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Many moths are endowed with ultrasound-sensitive ears that serve the detection and evasion of echolocating bats. Moths lacking such ears could still gain protection from bat biosonar by using stealth acoustic camouflage, absorbing sound waves rather than reflecting them back as echoes. The thorax of a moth is bulky and hence acoustically highly reflective. This renders it an obvious target for any bat. Much of the thorax of moths is covered in hair-like scales, the layout of which is remarkably similar in structure and arrangement to natural fibrous materials commonly used in sound insulation. Despite this structural similarity, the effect of thorax scales on moth echoes has never been characterized. Here, we test whether and how moth thorax scales function as an acoustic absorber. From tomographic echo images, we find that the thin layer of thoracic scales of diurnal butterflies affects the strength of ultrasound echoes from the thorax very little, while the thorax scales of earless moths absorbs an average of 67 ± 9% of impinging ultrasonic sound energy. We show that the thorax scales of moths provide acoustic camouflage by acting as broadband (20–160 kHz) stealth coating. Modelling results suggest the scales are acting as a porous sound absorber; however, the thorax scales of moths achieve a considerably higher absorption than technical fibrous porous absorbers with the same structural parameters. Such scales, despite being thin and lightweight, constitute a broadband, multidirectional and efficient ultrasound absorber that reduces the moths' detectability to hunting bats and gives them a survival advantage.
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38

Lee, Heow Pueh, Sanjay Kumar, and Jie Wei Aow. "Proof-of-Concept Design for MPP Acoustic Absorbers with Elements of Art." Designs 5, no. 4 (November 16, 2021): 72. http://dx.doi.org/10.3390/designs5040072.

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A micro-perforated plate or panel (MPP) is a device used to absorb sound. It consists of a thin flat plate made from several different materials with small holes and a back cavity. Several reported modifications and enhancements to the original design of the MPP acoustic absorber were modified by the holes or the back-cavity shape and sizes following the original idea. The present study attempts to artistically beautify the MPP acoustic absorbers by incorporating dotted arts into the design of MPP. The perforation for micro-perforated panels could be dotted arts with a perforation size smaller than 1 mm for enhanced acoustic absorption performance in the form of various artistic designs. Small LED lights could be placed inside the acoustic chamber to create the color lights emanating from the perforations instead of dots with different colors. Several MPP incorporated artistic designs of dotted patterns were presented and their acoustic absorption performance was analyzed using impedance tube in this paper.
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39

Van hoorickx, Cédric, Paul Didier, and Edwin Reynders. "Diffuse sound absorption modelling of complex finite absorbers using a hybrid deterministic-statistical energy analysis approach." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (August 1, 2021): 355–66. http://dx.doi.org/10.3397/in-2021-1444.

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This contribution presents a numerical approach to quantify the response of an absorber in a diffuse reverberation room. Conventionally, this is done by considering an infinite absorber coupled to an acoustic halfspace. It is, however, well known that the diffuse absorption coefficient for a finite absorber can be quite different due to what is referred to in literature as the edge effect. A finite size correction has been developed previously, but it is only applicable to homogeneous absorbers and is based on a computationally costly quintuple integration. This contribution presents an alternative approach in which a deterministic model, e.g. using the finite element or modal transfer matrix method, is coupled with a statistical model of the room using a hybrid deterministic-statistical energy analysis framework. With this framework, also the theoretical uncertainty on this diffuse sound absorption that is inherent in the diffuse field assumption can be quantified, i.e. the variance of sound absorption results that can be theoretically expected across an ensemble of reverberation rooms of the same volume. The methodology is numerically and experimentally validated for several absorber types.
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40

Shakeri, Rezgar, and Davood Younesian. "Broad-Band Noise Mitigation in Vibrating Annular Plates by Dynamic Absorbers." International Journal of Structural Stability and Dynamics 16, no. 06 (June 2016): 1550014. http://dx.doi.org/10.1142/s0219455415500145.

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Steady-state and transient acoustic radiation characteristics of clamped-free annular plate with tuned mass damper (TMD) device is studied. Galerkin’s procedure is employed to obtain the transverse vibration of the annular disk. Based on the Rayleigh integral approach, acoustic pressure radiation is obtained and subsequently the modal sound power and modal radiation efficiency are obtained. A new formulation for the transient acoustic pressure in Laplace domain is presented for the first time in this paper. Durbin’s numerical Laplace transform inversion scheme is employed to obtain the response spectrum. The optimum parameters of vibration absorbers are proposed for suppressing the dynamic vibration and acoustic pressure. A parametric study is carried out and the effects of vibration absorber characteristics are investigated using the analytical procedure. Limiting cases are considered and good agreements with the finite element solution, as well as with those available in the literature, are achieved.
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41

Xu, Zi-xiang, Hai-yang Meng, An Chen, Jing Yang, Bin Liang, and Jian-chun Cheng. "Tunable low-frequency and broadband acoustic metamaterial absorber." Journal of Applied Physics 129, no. 9 (March 7, 2021): 094502. http://dx.doi.org/10.1063/5.0038940.

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42

TSURU, Hideo. "313 Wave-acoustic consideration of absorber in Cabinet." Proceedings of the Dynamics & Design Conference 2007 (2007): _313–1_—_313–6_. http://dx.doi.org/10.1299/jsmedmc.2007._313-1_.

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43

Bao, X. ‐Q, Vijay K. Varadan, and Vasundara V. Varadan. "Active acoustic absorber for plane waves in water." Journal of the Acoustical Society of America 84, S1 (November 1988): S49. http://dx.doi.org/10.1121/1.2026338.

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44

Qian, Feng, Ping Zhao, Li Quan, Xiaozhou Liu, and Xiufen Gong. "Broadband acoustic omnidirectional absorber based on temperature gradients." EPL (Europhysics Letters) 107, no. 3 (August 1, 2014): 34009. http://dx.doi.org/10.1209/0295-5075/107/34009.

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45

Mariani, R., S. Bellizzi, B. Cochelin, P. Herzog, and P. O. Mattei. "Toward an adjustable nonlinear low frequency acoustic absorber." Journal of Sound and Vibration 330, no. 22 (October 2011): 5245–58. http://dx.doi.org/10.1016/j.jsv.2011.03.034.

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46

Wang, Cun, Shan-De Li, Wei-Guang Zheng, and Qi-Bai Huang. "Acoustic Absorption Characteristics of New Underwater Omnidirectional Absorber." Chinese Physics Letters 36, no. 4 (April 2019): 044301. http://dx.doi.org/10.1088/0256-307x/36/4/044301.

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47

Fouladi, Mohammad Hosseini, Masomeh Ghassem, Md Ayub, Mohd Jailani, and Mohd Nor. "Implementation of Coir Fiber as Acoustic Absorber Material." Noise & Vibration Worldwide 42, no. 9 (October 2011): 11–16. http://dx.doi.org/10.1260/0957-4565.42.9.11.

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48

Krüger, J., and M. Quickert. "Determination of acoustic absorber parameters in impedance tubes." Applied Acoustics 50, no. 1 (January 1997): 79–89. http://dx.doi.org/10.1016/s0003-682x(96)00017-5.

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49

Khair, Fazlin A., Azma Putra, Mohd Jailani Mohd Nor, Nurul Atiqah, and M. Z. Selamat. "Preliminary Study on Bamboo as Sound Absorber." Applied Mechanics and Materials 554 (June 2014): 76–80. http://dx.doi.org/10.4028/www.scientific.net/amm.554.76.

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Synthetic acoustic materials are known for their poisonous chemical substance to the environment and also the particles which are harmful to human health. Research is now directed towards finding an alternative acoustic absorber made from natural materials. This paper presents the utilization of bamboo, a natural material having hollow structure to act as sound absorber. In an impedance tube test, the hollow path is arranged to face the sound incidence. The result reveals that bamboo having length of 2 cm has average absorption coefficient of 0.95 at frequency above 3 kHz. Performance at lower frequencies can be controlled by adding the air gap behind the system. Introduction of microholes along the body shows no significant effect to increase the sound absorption.
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50

Xu, He, and Deyi Kong. "Dynamic sound absorption characteristics of a series piezoelectric acoustic absorber regulated by voltage." Journal of the Acoustical Society of America 151, no. 6 (June 2022): 3807–17. http://dx.doi.org/10.1121/10.0011639.

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A piezoelectric acoustic absorber composed of double micro-perforated panels (MPPs) and their back cavity is studied in this paper. The outer layer of the MPP absorber is a common metal MPP, and the inner layer is a piezoelectric MPP made of polyvinylidene fluoride (PVDF) film. When an alternating voltage is applied to the polyvinylidene fluoride (PVDF)-micro-perforated panel (MPP), it can be excited to generate different structural vibration modes, which can bring an additional absorption peak to the absorption performance curve of the piezoelectric acoustic absorber. The numerical simulation and experimental results indicate that the frequency and sound absorption coefficient of the additional sound absorption peak are closely related to the voltage parameters. Especially when the frequency of the alternating voltage is close to the eigen-frequency of PVDF-MPP, the additional sound absorption peak is more significant. Therefore, the absorption coefficient of the piezoelectric acoustic absorber at the corresponding frequency can be effectively enhanced by appropriately adjusting the parameters of the excitation voltage. This method of selectively and specifically improving the sound absorption performance of the required frequency band is very effective in reducing the noise in the dynamic change.
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