Results 71 to 80 of about 1,493,631 (236)
The acoustical absorption by air-saturated aerogel powders
The Journal of the Acoustical Society of America, 2022 The acoustical behavior of air-saturated aerogel powders in the audible frequency range is not well understood. It is not clear, for example, which physical processes control the acoustic absorption and/or attenuation in a very light, loose granular mix in which the grain diameter is on the order of a micron.
Begum, H. +3 more
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Muhandisī-i bihdāsht-i ḥirfah/ī, 2016 Introduction: In Iran country, there is a lack of reliable data on acoustic characteristics of building materials applied in the offices and industrial rooms.
Mohsen Aliabadi +3 more
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Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023, 2022 The omnidirectional parametric loudspeaker (OPL) is a sound source that exploits the phenomenon of the parametric acoustic array (PAA) to produce an omnidirectional sound field. It consists of hundreds of ultrasound transducers distributed on the surface
Italy Turin +6 more
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Between Science and Art: Thin Sound Absorbers Inspired by Slavic Ornaments
Frontiers in Materials, 2019 Acoustic metamaterials have opened fascinating opportunities for manipulation of low-frequency sound and development of compact structures with broadband acoustic performance for noise mitigation applications, room and architectural acoustics.
Anastasiia O. Krushynska
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Energies, 2023 The speech intelligibility properties of classrooms greatly influence the learning process of students. Proper acoustics can promote the inclusion of foreign students and children with learning or hearing impairments.
Paolo Croce +3 more
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Acoustic Absorption Coefficients at High Frequencies [PDF]
The Journal of the Acoustical Society of America, 1949 The measurement of the acoustic absorption coefficient by a steady state method was carried out at frequencies of 9, 20, and 30 kc for seven different materials. This involved the construction of a sound chamber with facilities for creating a diffuse sound field and a sample area where materials could be mounted.
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Journal of Mathematics in IndustryIn the automotive industry, the absorption coefficient of a porous material layer is usually measured in an alpha cabin, a reverberant chamber of reduced dimensions where the operational frequency range is limited and the absorbent sample size is ...
Laura Río-Martín +2 more
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Ultra-Thin Metasurface-Based Absorber of Low-Frequency Sound With Bandwidth Optimization
Frontiers in Materials, 2021 We report, both theoretically and experimentally, a type of ultra-thin metasurface-based low-frequency sound absorber with bandwidth optimization. Such a metasurface unit consists of an ultrathin resonator (thickness∼1/90 wavelength) with a circular hole
Yi-jun Guan +9 more
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Air Absorption Error in Room Acoustical Modeling [PDF]
The Journal of the Acoustical Society of America, 2008 Most statistical and ray-tracing computer models take into account the absorption of sound by air when calculating the reverberation time. Extensive research by many scientist lead to the standardized calculation model for pure tone air absorption.
HJ Heiko Martin +3 more
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Materials & Design, 2019 Reticulated foams are widely used in noise control applications. However, difficulties in controlling the foaming process makes it difficult to control the microstructure and consequently the absorption characteristics of stochastic foams.
Sagar Deshmukh +2 more
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