1. |
- Rudenko, Oleg, et al.
(author)
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Enhancements of energy and Q-factor of a nonlinear resonator with increase in its losses
- 2002
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In: Doklady Akademii Nauk. - : MAIK Nauka/Interperiodica Publishing, Russia. - 0869-5652. ; 383:1, s. 330-333
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Journal article (peer-reviewed)abstract
- A phenomenon that is paradoxical at first sight is studied: an appropriately-organized energy outflow from a resonator cavity results not in the attenuation of nonlinear vibrations but in their noticeable enhancement. An increase in the resonator Q-factor and in the energy accumulated in it is well pronounced when the frequencies of the higher harmonics generated in a nonlinear medium are close to the natural frequencies of the resonator. An important example of a nonlinear system with the necessary properties is an acoustic resonator with selective losses.
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2. |
- Rudenko, Oleg, et al.
(author)
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Nonlinear model of a granulated medium containing viscous fluid layers and gas cavities
- 2012
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In: Acoustical Physics. - : MAIK NAUKA/INTERPERIODICA/SPRINGER. - 1063-7710 .- 1562-6865. ; 58:1, s. 99-106
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Journal article (peer-reviewed)abstract
- We analyze nonlinear oscillations and waves in a simple model of a granular medium containing inclusions in the form of fluid layers and gas cavities. We show that in such a medium, the velocity of one of the wave modes is low; therefore, the nonlinearity is high and the effects of interaction are more strongly expressed than usual.
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3. |
- Rudenko, Oleg, et al.
(author)
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Nonlinear response of a layer to pulse action in diagnostics of small inhomogenities
- 2000
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In: Doclady, Section Mechanics (Reports of the Russian Academy of Sciences) / Doklady Akademii Nauk. - : MAIK Nauka/Interperiodica Publishing, Russia. - 0869-5652. ; 374 ; 1-3, s. 194-197
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Journal article (peer-reviewed)abstract
- Giant nonlinear respons are observed at acoustic irradiation of microscopic gas bubbles in liquids, cracks and fluid-filled pores in solids; and compressed contact of rough surfaces, and is used in diagnostics of materials of industrial and geological structures. Reconstruction of characteristics of a scattering inhomogeneity requires an analyses of complicated inverse problems. The problem of plane-wave incidence upon a layer is simple and serves a model for more complicated inhomogeneities; its response enables us to reconstruct the spectral composition and field structure of other nonlinear scatterers.
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