7 research outputs found
Survey: Local Consumer Sentiment is Stabilizing
In this paper a mathematical model describing small oscillations of a heterogeneous medium is considered.
The medium consists of a partially perforated elastic material and a slightly viscous compressible fluid
filling the pores. For the given model the corresponding homogenized problem is constructed by using the
two-scale convergence method. The boundary conditions connecting equations of the homogenized model
on the boundary between the continuous elastic material and the porous elastic material with fluid are
foun
Spectrum of One-dimensional Vibrations of a Layered Medium Consisting of a Kelvin-Voigt Material and a Viscous Incompressible Fluid
The paper considers a mathematical model for natural vibrations of a periodic layered medium. The medium consists of a viscoelastic Kelvin-Voigt material and a viscous incompressible ο¬uid. For the given model, two homogenized models are derived. They correspond to the cases of transverse and longitudinal vibrations of the layered medium. It is shown that the spectrum of each homogenized model is the union of roots of the corresponding quadratic equations.Π Π°ΡΡΠΌΠΎΡΡΠ΅Π½Π° ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠ°Ρ ΠΌΠΎΠ΄Π΅Π»Ρ, ΠΎΠΏΠΈΡΡΠ²Π°ΡΡΠ°Ρ ΡΠΎΠ±ΡΡΠ²Π΅Π½Π½ΡΠ΅ ΠΊΠΎΠ»Π΅Π±Π°Π½ΠΈΡ ΠΏΠ΅ΡΠΈΠΎΠ΄ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ»ΠΎΠΈΡΡΠΎΠΉ ΡΡΠ΅Π΄Ρ, ΡΠΎΡΡΠ°Π²Π»Π΅Π½Π½ΠΎΠΉ ΠΈΠ· Π²ΡΠ·ΠΊΠΎΡΠΏΡΡΠ³ΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° ΠΠ΅Π»ΡΠ²ΠΈΠ½Π°-Π€ΠΎΠΉΠ³ΡΠ° ΠΈ Π²ΡΠ·ΠΊΠΎΠΉ Π½Π΅ΡΠΆΠΈΠΌΠ°Π΅ΠΌΠΎΠΉ ΠΆΠΈΠ΄ΠΊΠΎΡΡΠΈ. ΠΠ»Ρ Π΄Π°Π½Π½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΏΠΎΡΡΡΠΎΠ΅Π½Ρ Π΄Π²Π΅ ΡΡΡΠ΅Π΄Π½Π΅Π½Π½ΡΠ΅ ΠΌΠΎΠ΄Π΅Π»ΠΈ, ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠΈΠ΅ ΠΏΠΎΠΏΠ΅ΡΠ΅ΡΠ½ΡΠΌΠΈΠΏΡΠΎΠ΄ΠΎΠ»ΡΠ½ΡΠΌΠΊΠΎΠ»Π΅Π±Π°Π½ΠΈΡΠΌΡΠ»ΠΎΠΈΡΡΠΎΠΉΡΡΠ΅Π΄Ρ. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ,ΡΡΠΎΡΠΏΠ΅ΠΊΡΡΠΊΠ°ΠΆΠ΄ΠΎΠΉΡΡΡΠ΅Π΄Π½Π΅Π½Π½ΠΎΠΉΠΌΠΎΠ΄Π΅Π»ΠΈ Π΅ΡΡΡ ΠΎΠ±ΡΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΠ΅ ΠΊΠΎΡΠ½Π΅ΠΉ ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠΈΡ
ΠΊΠ²Π°Π΄ΡΠ°ΡΠ½ΡΡ
ΡΡΠ°Π²Π½Π΅Π½ΠΈΠΉ
Spectrum of One-dimensional Vibrations of a Layered Medium Consisting of a Kelvin-Voigt Material and a Viscous Incompressible Fluid
The paper considers a mathematical model for natural vibrations of a periodic layered medium. The medium consists of a viscoelastic Kelvin-Voigt material and a viscous incompressible ο¬uid. For the given model, two homogenized models are derived. They correspond to the cases of transverse and longitudinal vibrations of the layered medium. It is shown that the spectrum of each homogenized model is the union of roots of the corresponding quadratic equations.Π Π°ΡΡΠΌΠΎΡΡΠ΅Π½Π° ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠ°Ρ ΠΌΠΎΠ΄Π΅Π»Ρ, ΠΎΠΏΠΈΡΡΠ²Π°ΡΡΠ°Ρ ΡΠΎΠ±ΡΡΠ²Π΅Π½Π½ΡΠ΅ ΠΊΠΎΠ»Π΅Π±Π°Π½ΠΈΡ ΠΏΠ΅ΡΠΈΠΎΠ΄ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ»ΠΎΠΈΡΡΠΎΠΉ ΡΡΠ΅Π΄Ρ, ΡΠΎΡΡΠ°Π²Π»Π΅Π½Π½ΠΎΠΉ ΠΈΠ· Π²ΡΠ·ΠΊΠΎΡΠΏΡΡΠ³ΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° ΠΠ΅Π»ΡΠ²ΠΈΠ½Π°-Π€ΠΎΠΉΠ³ΡΠ° ΠΈ Π²ΡΠ·ΠΊΠΎΠΉ Π½Π΅ΡΠΆΠΈΠΌΠ°Π΅ΠΌΠΎΠΉ ΠΆΠΈΠ΄ΠΊΠΎΡΡΠΈ. ΠΠ»Ρ Π΄Π°Π½Π½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΏΠΎΡΡΡΠΎΠ΅Π½Ρ Π΄Π²Π΅ ΡΡΡΠ΅Π΄Π½Π΅Π½Π½ΡΠ΅ ΠΌΠΎΠ΄Π΅Π»ΠΈ, ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠΈΠ΅ ΠΏΠΎΠΏΠ΅ΡΠ΅ΡΠ½ΡΠΌΠΈΠΏΡΠΎΠ΄ΠΎΠ»ΡΠ½ΡΠΌΠΊΠΎΠ»Π΅Π±Π°Π½ΠΈΡΠΌΡΠ»ΠΎΠΈΡΡΠΎΠΉΡΡΠ΅Π΄Ρ. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ,ΡΡΠΎΡΠΏΠ΅ΠΊΡΡΠΊΠ°ΠΆΠ΄ΠΎΠΉΡΡΡΠ΅Π΄Π½Π΅Π½Π½ΠΎΠΉΠΌΠΎΠ΄Π΅Π»ΠΈ Π΅ΡΡΡ ΠΎΠ±ΡΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΠ΅ ΠΊΠΎΡΠ½Π΅ΠΉ ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠΈΡ
ΠΊΠ²Π°Π΄ΡΠ°ΡΠ½ΡΡ
ΡΡΠ°Π²Π½Π΅Π½ΠΈΠΉ
Π£ΡΡΠ΅Π΄Π½Π΅Π½ΠΈΠ΅ ΡΡΠ°Π²Π½Π΅Π½ΠΈΠΉ Π°ΠΊΡΡΡΠΈΠΊΠΈ Π΄Π»Ρ ΡΠ°ΡΡΠΈΡΠ½ΠΎ ΠΏΠ΅ΡΡΠΎΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΡΠΏΡΡΠ³ΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° ΡΠΎ ΡΠ»Π°Π±ΠΎΠ²ΡΠ·ΠΊΠΎΠΉ ΠΆΠΈΠ΄ΠΊΠΎΡΡΡΡ
In this paper a mathematical model describing small oscillations of a heterogeneous medium is considered.
The medium consists of a partially perforated elastic material and a slightly viscous compressible fluid
filling the pores. For the given model the corresponding homogenized problem is constructed by using the
two-scale convergence method. The boundary conditions connecting equations of the homogenized model
on the boundary between the continuous elastic material and the porous elastic material with fluid are
foundΠ Π°ΡΡΠΌΠΎΡΡΠ΅Π½Π° ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠ°Ρ ΠΌΠΎΠ΄Π΅Π»Ρ, ΠΎΠΏΠΈΡΡΠ²Π°ΡΡΠ°Ρ ΠΌΠ°Π»ΡΠ΅ ΠΊΠΎΠ»Π΅Π±Π°Π½ΠΈΡ Π³Π΅ΡΠ΅ΡΠΎΠ³Π΅Π½Π½ΠΎΠΉ ΡΡΠ΅Π΄Ρ, ΡΠΎΡΡΠΎ-
ΡΡΠ΅ΠΉ ΠΈΠ· ΡΠ°ΡΡΠΈΡΠ½ΠΎ ΠΏΠ΅ΡΡΠΎΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΡΠΏΡΡΠ³ΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° ΠΈ ΡΠ»Π°Π±ΠΎΠ²ΡΠ·ΠΊΠΎΠΉ ΡΠΆΠΈΠΌΠ°Π΅ΠΌΠΎΠΉ ΠΆΠΈΠ΄ΠΊΠΎΡΡΠΈ,
Π·Π°ΠΏΠΎΠ»Π½ΡΡΡΠ΅ΠΉ ΠΏΠΎΡΡ. ΠΠ»Ρ Π΄Π°Π½Π½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ Ρ ΠΏΠΎΠΌΠΎΡΡΡ ΠΌΠ΅ΡΠΎΠ΄Π° Π΄Π²ΡΡ
ΠΌΠ°ΡΡΡΠ°Π±Π½ΠΎΠΉ ΡΡ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΠΈ ΠΏΠΎΡΡΡΠΎ-
Π΅Π½Π° ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠ°Ρ ΡΡΡΠ΅Π΄Π½Π΅Π½Π½Π°Ρ ΠΌΠΎΠ΄Π΅Π»Ρ ΠΈ Π½Π°ΠΉΠ΄Π΅Π½Ρ Π³ΡΠ°Π½ΠΈΡΠ½ΡΠ΅ ΡΡΠ»ΠΎΠ²ΠΈΡ, ΡΠ²ΡΠ·ΡΠ²Π°ΡΡΠΈΠ΅ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ
ΡΡΡΠ΅Π΄Π½Π΅Π½Π½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ Π½Π° Π³ΡΠ°Π½ΠΈΡΠ΅ ΠΌΠ΅ΠΆΠ΄Ρ ΡΠΏΠ»ΠΎΡΠ½ΡΠΌ ΡΠΏΡΡΠ³ΠΈΠΌ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠΌ ΠΈ ΠΏΠΎΡΠΈΡΡΡΠΌ ΡΠΏΡΡΠ³ΠΈΠΌ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠΌ Ρ ΠΆΠΈΠ΄ΠΊΠΎΡΡΡ
Π£ΡΡΠ΅Π΄Π½Π΅Π½ΠΈΠ΅ ΡΡΠ°Π²Π½Π΅Π½ΠΈΠΉ Π°ΠΊΡΡΡΠΈΠΊΠΈ Π΄Π»Ρ ΡΠ°ΡΡΠΈΡΠ½ΠΎ ΠΏΠ΅ΡΡΠΎΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΡΠΏΡΡΠ³ΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° ΡΠΎ ΡΠ»Π°Π±ΠΎΠ²ΡΠ·ΠΊΠΎΠΉ ΠΆΠΈΠ΄ΠΊΠΎΡΡΡΡ
In this paper a mathematical model describing small oscillations of a heterogeneous medium is considered.
The medium consists of a partially perforated elastic material and a slightly viscous compressible fluid
filling the pores. For the given model the corresponding homogenized problem is constructed by using the
two-scale convergence method. The boundary conditions connecting equations of the homogenized model
on the boundary between the continuous elastic material and the porous elastic material with fluid are
foun
ΠΡΡΠ΅ΠΊΡΠΈΠ²Π½ΡΠ΅ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Π°ΠΊΡΡΡΠΈΠΊΠΈ Π΄Π»Ρ ΡΠ»ΠΎΠΈΡΡΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°, ΠΎΠΏΠΈΡΡΠ²Π°Π΅ΠΌΠΎΠ³ΠΎ Π΄ΡΠΎΠ±Π½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΡΡ ΠΠ΅Π»ΡΠ²ΠΈΠ½Π°-Π€ΠΎΠΉΠ³ΡΠ°
The paper is devoted to the construction of effective acoustic equations for a two-phase
layered viscoelastic material described by the KelvinβVoigt model with fractional time derivatives. For
this purpose, the theory of two-scale convergence and the Laplace transform with respect to time are
used. It is shown that the effective equations are partial integro-differential equations with fractional
time derivatives and fractional exponential convolution kernels. In order to find the coefficients and the
convolution kernels of these equations, several auxiliary cell problems are formulated and solvedΠ‘ΡΠ°ΡΡΡ ΠΏΠΎΡΠ²ΡΡΠ΅Π½Π° ΠΏΠΎΡΡΡΠΎΠ΅Π½ΠΈΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΡΡ
ΡΡΠ°Π²Π½Π΅Π½ΠΈΠΉ Π°ΠΊΡΡΡΠΈΠΊΠΈ Π΄Π»Ρ Π΄Π²ΡΡ
ΡΠ°Π·Π½ΠΎΠ³ΠΎ ΡΠ»ΠΎΠΈΡΡΠΎΠ³ΠΎ Π²ΡΠ·ΠΊΠΎΡΠΏΡΡΠ³ΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°, ΠΎΠΏΠΈΡΡΠ²Π°Π΅ΠΌΠΎΠ³ΠΎ ΠΌΠΎΠ΄Π΅Π»ΡΡ ΠΠ΅Π»ΡΠ²ΠΈΠ½Π°βΠ€ΠΎΠΉΠ³ΡΠ° Ρ Π΄ΡΠΎΠ±Π½ΡΠΌΠΈ
ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄Π½ΡΠΌΠΈ ΠΏΠΎ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ. ΠΠ»Ρ ΡΡΠΎΠΉ ΡΠ΅Π»ΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΠ΅ΡΡΡ ΡΠ΅ΠΎΡΠΈΡ Π΄Π²ΡΡ
ΠΌΠ°ΡΡΡΠ°Π±Π½ΠΎΠΉ ΡΡ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΠΈ ΠΈ
ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΠ°ΠΏΠ»Π°ΡΠ° ΠΏΠΎ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΡΠ΅ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ ΡΠ²Π»ΡΡΡΡΡ ΠΈΠ½ΡΠ΅Π³ΡΠΎΠ΄ΠΈΡΡΠ΅ΡΠ΅Π½ΡΠΈΠ°Π»ΡΠ½ΡΠΌΠΈ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡΠΌΠΈ Π² ΡΠ°ΡΡΠ½ΡΡ
ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄Π½ΡΡ
Ρ Π΄ΡΠΎΠ±Π½ΡΠΌΠΈ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄Π½ΡΠΌΠΈ ΠΏΠΎ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ
ΠΈ Π΄ΡΠΎΠ±Π½ΠΎ-ΡΠΊΡΠΏΠΎΠ½Π΅Π½ΡΠΈΠ°Π»ΡΠ½ΡΠΌΠΈ ΡΠ΄ΡΠ°ΠΌΠΈ ΡΠ²Π΅ΡΡΠΊΠΈ. ΠΠ»Ρ ΡΠΎΠ³ΠΎ ΡΡΠΎΠ±Ρ Π½Π°ΠΉΡΠΈ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½ΡΡ ΠΈ ΡΠ΄ΡΠ° ΡΠ²Π΅ΡΡΠΎΠΊ ΡΡΠΈΡ
ΡΡΠ°Π²Π½Π΅Π½ΠΈΠΉ, ΡΡΠΎΡΠΌΡΠ»ΠΈΡΠΎΠ²Π°Π½Ρ ΠΈ ΡΠ΅ΡΠ΅Π½Ρ Π½Π΅ΡΠΊΠΎΠ»ΡΠΊΠΎ Π²ΡΠΏΠΎΠΌΠΎΠ³Π°ΡΠ΅Π»ΡΠ½ΡΡ
Π·Π°Π΄Π°