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21.
The paper discusses the active damping of the resonant flexural vibrations of a clamped thermoviscoelastic rectangular plate
with distributed piezoelectric sensors and actuators. The thermoviscoelastic behavior of the passive and active materials
is described using the concept of complex characteristics. The interaction of the mechanical and thermal fields is taken into
account. The Bubnov–Galerkin method is used. The effect of self-heating, the dimensions of the piezoelectric inclusions, and
the feedback factor on the effectiveness of active damping of the resonance vibrations of the plate is studied 相似文献
22.
The paper discusses the active damping of the resonant flexural vibrations of a hinged thermoviscoelastic rectangular plate
with distributed piezoelectric sensors and actuators. The thermoviscoelastic behavior of the passive and active materials
is described using the concept of complex characteristics. The interaction of mechanical and thermal fields is taken into
account. The Bubnov–Galerkin method is used. The effect of dissipative heating, the dimensions of the piezoelectric inclusions,
and the feedback factor on the effectiveness of active damping of resonance vibrations of the plate is studied 相似文献
23.
V. N. Elokhina A. S. Nakhmanovich R. V. Karnaukhova I. D. Kalikhman O. B. Bannikova 《Russian Chemical Bulletin》1990,39(11):2390-2393
The reaction of N,N-bis(dithiocarboxy)piperazine with acetylenic ketones and methyl propiolate gave N,N-bis(acylvinyldithiocarbo)- and N,N -bis(methoxy-carbonylvinyldithiocarbo)piperazines. Heating the compounds obtained with perchloric acid leads to intramolecular cyclization with the formation of N,N -bis[2-acyl(methoxycarbonyl)methyl-1,3-dithietanium]piperazine perchlorates.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2637–2640, November, 1990. 相似文献
24.
25.
T. V. Karnaukhova 《Journal of Mathematical Sciences》2010,168(4):603-612
Using a new approach, we consider the problem of active damping of the forced resonance vibrations of a viscoelastic isotropic
cylindrical panel with simply supported edge faces. The mechanical load is assumed to be unknown; it can be found from the
experimental data of a sensor. The problem is solved by the Bubnov–Galerkin method. A relation was obtained for the potential
difference that has to be supplied to an actuator for the damping of resonance vibrations of the panel. We also study the
influence of sizes of sensors and actuators, the dissipative properties of materials, and temperature on the efficiency of
active damping of the forced resonance vibrations of a cylindrical panel. 相似文献
26.
Basic Equations for Viscoelastic Laminated Shells with Distributed Piezoelectric Inclusions Intended to Control Nonstationary Vibrations 总被引:2,自引:0,他引:2
The basic equations for viscoelastic laminated shells with distributed piezoelectric sensors and actuators are presented. Physical and geometrical nonlinearities are taken into account. It is shown that the asymptotic methods of nonlinear mechanics can be used in combination with the Bubnov–Galerkin method to solve nonlinear boundary value problems. 相似文献
27.
The oscillation and dissipative heating of an infinitely long piezoceramic cylinder polarized along the radius is considered
in the case of partial heat depolarization, with harmonic quasi-static loading of the cylinder by a potential difference.
The inner surface of the cylinder is thermally insulated; there is heat transfer at the outer surface. An analytical solution
is obtained, and numerical calculations are performed for a TsTStBS-2 piezoceramic. The conditions in which the depolarized
zone appears are examined, along with the stress-strain state of the cylinder.
S. P. Timoshenko Institute of Mechanics, National Academy of Sciences of Ukraine, Kiev, Ukraine. Translated from Prikladnaya
Mekhanika, Vol. 35, No. 3, pp. 42–48, March, 1999. 相似文献
28.
The problem of induced resonance vibrations and dissipation heating in a rectangular bimorphous plate made of a dissipative
piezoelectric material under a harmonic potential difference is tackled. The edges of the plate are considered to be hinged
and ideally thermally insulated. The dissipation properties of the material are taken into account on the basis of the concept
of complex characteristics, which are assumed to be temperature-independent. An exact solution is found for the problem. The
critical value of the load parameter is determined when the maximum temperature reaches the Curie point. A finite-element
method has been developed for investigating the dynamic behavior and temperature of vibrational heating that bimorphous plates
made of a viscoelastic material undergo under a harmonic load. The results obtained for the electromechanical vibrations of
plates by finite-element calculations and by an analytical solution are compared.
Translated from Prikladnaya Mekhanika, Vol. 35, No. 9, pp. 85–93, September, 1999. 相似文献
29.
The paper deals with a conjugate problem of harmonic electromechanical vibrations and dissipative heating of a thin closed
spherical and an infinitely long cylindrical piezoelectric shells with allowance for the temperature dependence of the viscoelastic
properties and the phenomenon of thermal depolarization. The presence of an acoustic medium inside and outside the shell is
taken into account. An explicit expression is derived for the critical electrical load for the case of constant electromechanical
characteristics. Using a spherical shell as an example, we study the effect that the frequency of the harmonic load, the geometric
parameters, and the external acoustic medium have on the critical electrical load as well as the temperature dependence of
the electromechanical properties, including the Curie point, on the temperature-frequency characteristics.
Translated from Prikladnaya Mekhanika, Vol. 35, No. 11, pp. 62–67, November, 1999. 相似文献
30.
The basic equations for thin-walled thermoviscoelastic plates with distributed piezoelectric actuators under monoharmonic
mechanical and electric loads are derived. The thermomechanical behavior of materials is described using the concept of complex
characteristics. Variational methods of solving nonlinear problems of active damping of the bending vibrations of plates are
considered. The effect of dissipative heating on the damping of the axisymmetric bending vibrations of a circular plate is
examined as an example
Translated from Prikladnaya Mekhanika, Vol. 45, No. 2, pp. 107–123, February 2009. 相似文献