Search Results - "Bobrovnitskii, Yu. I."

Sound Absorption and Metamaterials: A Review by Bobrovnitskii, Yu. I., Tomilina, T. M.

“…The paper reviews and analyzes the state of the art of the problem on sound absorption in the linear formulation and methods for solving it. It is shown that…”
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Laboratory Experimental Facility for Studying Metamaterial Sound-absorbing Duct Linings with Grazing Sound Propagation and How the Type of Source Influences their Efficiency by Bobrovnitskii, Yu. I., Tomilina, T. M., Bakhtin, B. N., Grebennikov, A. S., Asfandiyarov, S. A., Karpov, I. A., Kim, A. A.

“…The article describes an experimental facility for studying and testing sound-absorbing linings made of acoustic metamaterials designed to reduce the noise…”
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An Optimum Absorber of Vibrational Energy by Bobrovnitskii, Yu. I., Morozov, K. D., Tomilina, T. M.

“…Analytical expressions for the impedance characteristics inherent to an optimum absorber are derived. The results of the laboratory experiment in which the…”
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Theoretical Model and Experimental Study of an Efficient Resonance-Type Sound Absorber for the Middle Frequency Region by Tomilina, T. M., Bakhtin, B. N., Afanasev, K. M., Bobrovnitskii, Yu. I.

“…A model of an efficient sound absorber with an internal structure consisting of several compact resonators with different parameters is considered. Maximum…”
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A new impedance-based approach to analysis and control of sound scattering by Bobrovnitskii, Yu.I.

“…A new theoretical solution to the problem of scattering sound by arbitrary obstacles in a fluid medium is presented. The scattering matrices are expressed in…”
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A Rayleigh-type wave at the plane interface of two homogeneous fluid half-spaces by Bobrovnitskii, Yu. I.

“…It is shown that at the plane interface of two homogeneous fluid semi-infinite media, of which one is an ordinary fluid and the other a double negative—i.e., a…”
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Negative mass and elasticity by Bobrovnitskii, Yu. I.

“…The paper introduces the concept of equivalent mass and elasticity. The physical sense of their negative values is explained, and it is demonstrated that they…”
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A periodic surface structure with extreme acoustic properties by Bobrovnitskiĭ, Yu. I., Morozov, K. D., Tomilina, T. M.

“…Several variational problems of sound absorption and scattering are solved using an impedance-based approach. Analytical expressions are derived for the…”
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Impedance theory of sound absorption: The best absorber and the black body by Bobrovnitskiĭ, Yu. I.

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A nonscattering coating for a cylinder by Bobrovnitskiĭ, Yu. I.

“…A thin coating with an extended reaction (see Acoust. Phys. 53 , 535 (2007)) is used to reduce the reflection and scattering of waves from an infinite…”
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Impedance theory of sound scattering: General relations by Bobrovnitskiĭ, Yu. I.

“…The problem of sound scattering by an elastic body of arbitrary geometry in an acoustic medium is solved by the impedance method. It is shown that, for a…”
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Models and general wave properties of two-dimensional acoustic metamaterials and media by Bobrovnitskii, Yu. I.

“…For two-dimensional linear acoustic metamaterials and media represented in the form of periodic structures made of complex cells, a general model is proposed,…”
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Theory of the new high-efficiency absorbing and nonscattering coatings by Bobrovnitskiĭ, Yu. I.

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Impedance theory of sound scattering and absorption: A constrained best absorber and the efficiency bounds of passive scatterers and absorbers by Bobrovnitskiĭ, Yu. I.

“…A constrained best absorber is defined as a body that absorbs the maximum incident sound power among all of the passive bodies of the same geometry under the…”
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General solution to the problem of the best sound absorber by Bobrovnitskiĭ, Yu. I.

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An acoustic metamaterial with unusual wave properties by Bobrovnitskii, Yu. I.

“…Several structural variants of a new acoustic metamaterial are proposed with unusual wave properties, and normal wave dispersion is studied. One of the…”
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Effective parameters and energy of acoustic metamaterials and media by Bobrovnitskii, Yu. I.

“…An approach is proposed to describe a general form of acoustic media, in particular, acoustic metamaterials, based on their modeling with the simplest discrete…”
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A discrete model of damped acoustic metamaterials by Bobrovnitskii, Yu. I., Tomilina, T. M., Laktionova, M. M.

“…For damped acoustic metamaterials, a discrete model is proposed in the form of a periodic structure with cells of the simplest type. The effective parameters…”
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Scientific principles of acoustic stealth by Bobrovnitskii, Yu. I.

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Hysteretic damping and causality by Bobrovnitskii, Yu. I.

“…It is proven that linear oscillatory systems with hysteretic damping in the form of complex stiffness and/or complex elastic moduli satisfy the causality…”
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