Results 281 to 290 of about 1,827,815 (335)
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Inhomogeneous absorption and geometric acoustics
The Journal of the Acoustical Society of America, 1998The conventional formulation of geometric acoustics in the presence of inhomogeneous (spatially varying) absorption is examined. This formulation is found to fail under conditions of multipath propagation, because interference between ray paths is not taken into account when the absorptive losses are calculated.
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Journal of the Acoustical Society of America
Nonreciprocal acoustic devices have been shown to be able to control incident waves propagating in one direction whilst allowing incident waves propagating in the opposite direction to be transmitted without modification. Nonreciprocal sound transmission,
Joe Tan, J. Cheer, Charlie House
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Nonreciprocal acoustic devices have been shown to be able to control incident waves propagating in one direction whilst allowing incident waves propagating in the opposite direction to be transmitted without modification. Nonreciprocal sound transmission,
Joe Tan, J. Cheer, Charlie House
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Labyrinthine acoustic metastructures enabling broadband sound absorption and ventilation
, 2020There is growing interest in the development of path coiling-based labyrinthine acoustic metamaterials for realizing extraordinary acoustical properties such as low-to-mid frequency sound absorption.
Sanjay Kumar, H. Lee
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Green sound-absorbing material prepared by using natural fiber for building acoustics
Proceedings of the Institution of mechanical engineers. Part E, journal of process mechanical engineeringNatural fibers are recently seen as a replacement for synthetic fibers as core material to produce sound-absorbent materials. These are biodegradable and renewable, and using them as sound-absorbent material brings many environmental benefits as it is ...
Ashutosh Tripathi +4 more
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Advanced Materials & Technologies
Lattice structures with customizable acoustical and mechanical properties show significant promise as practical engineering materials. However, the geometry of traditional lattice structures simultaneously dictates both acoustical and mechanical ...
Xinwei Li +4 more
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Lattice structures with customizable acoustical and mechanical properties show significant promise as practical engineering materials. However, the geometry of traditional lattice structures simultaneously dictates both acoustical and mechanical ...
Xinwei Li +4 more
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MODELLING AUDITORIUM ACOUSTICS WITH LIGHT
AcousticsAn optical method is presented for estimating the loudness, subjective spaciousness or clarity index within a proposed auditorium. A mirrored small scale model is constructed which contains a finite size light source.
RJ Pinnington, CB Nathanail
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Acoustic absorption characteristics of foamed aluminum
Acta Physica Sinica (Overseas Edition), 1998The acoustic absorption characteristics of foamed aluminum and the effect of its structural parameters on the characteristics have been investigated. The results indicate that the acoustic absorption behavior of foamed aluminum has an uncertain relation with its porosity; the effect of pore size is non-monotonous, while the flow resistance, which ...
Han Fu-sheng +4 more
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Acoustical absorption in Bragg diffraction imaging
Journal of Physics D: Applied Physics, 1977The influence of absorption of the ultrasound in the water of the Bragg cell of Bragg diffraction imaging systems is studied theoretically. It is shown that the optical image formed is that of a distorted sound field which can be written in terms of the unattenuated acoustical spectrum and geometrical factors. The absorption causes a loss of resolution
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Ultra-broadband absorption by acoustic metamaterials
Applied Physics Letters, 2014We design and experimentally realize an ultra-broad band metamaterial-based acoustic absorption material. Unlike traditional acoustic absorbers, the designed device features a simple configuration unrestricted by the material type and does not require extra sound-absorbing materials, suggesting the potential to have simultaneously structural-stiffness ...
Xue Jiang +5 more
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