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Nonresonant acoustic absorption of Ising magnet
Theoretical and Mathematical Physics, 1994Zubarev's nonequilibrium statistical operator method is used to construct a theory of the nonresonant acoustic absorption of the linear Ising magnet, the basic Hamiltonian of which is of the two-particle kind and is treated without approximations. The frequency dependence of the absorption is determined and found to differ analytically from the well ...
I. S. Donskaya +2 more
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Sound Absorption Coefficients and Acoustic Impedance
The Journal of the Acoustical Society of America, 1941The relation between normal acoustic impedance and the various types of absorption coefficient has been discussed and specific formulas for the coefficients in terms of acoustic impedance have been published. Contours of constant absorption coefficient plotted as a function of the real and imaginary parts of acoustic impedance plotted on a linear scale
Richard L. Brown, Philip M. Morse
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Observation of Coherent Perfect Acoustic Absorption at an Exceptional Point.
Physical Review LettersNon-Hermitian systems have recently shown new possibilities to manipulate wave scattering by exploiting loss, yet coherent perfect absorption at an exceptional point (CPA EP) remains elusive in acoustics.
Yifei Xia +7 more
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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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Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications
Mechanical metamaterials have become increasingly attractive due to their numerous attributes, including low weight, high strength, negative Poisson's ratio, and high energy absorption. Traditionally, metamaterials have been utilised in wave manipulation
F. Mwema, Ndivhuwo Ndou
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Mechanical metamaterials have become increasingly attractive due to their numerous attributes, including low weight, high strength, negative Poisson's ratio, and high energy absorption. Traditionally, metamaterials have been utilised in wave manipulation
F. Mwema, Ndivhuwo Ndou
semanticscholar +1 more source
Smart materials and structures (Print)
Low-frequency broadband sound absorption is a hot topic in the field of acoustics. For the Helmholtz resonator, the low-frequency sound wave can be controlled by adjusting the size of the structure.
Meng Li Xue +8 more
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Low-frequency broadband sound absorption is a hot topic in the field of acoustics. For the Helmholtz resonator, the low-frequency sound wave can be controlled by adjusting the size of the structure.
Meng Li Xue +8 more
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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,
J. 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,
J. Tan, J. Cheer, Charlie House
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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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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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