Forced nonstationary axisymmetric vibrations of a piezoceramic thin bimorph plate

We consider a nonstationary axisymmetric problem for a thin axially polarized bimorph plate whose end surfaces are under the action of an electric potential, which is an arbitrary function of the radial coordinate and time. On the basis of Timoshenko theory, the finite integral transformation method is used to construct a new closed solution. The obtained computational relations allow one to study the stress-strain state of piezoceramic elements with continuous and split circular electrodes.     

Forced axisymmetric vibrations of a hollow piezoceramic sphere with an electrical method of excitation

International Applied Mechanics -     

Forced axisymmetric vibrations and self-heating of a circular viscoelastic plate,controlled with piezoelectric sensors and actuators

The forced monoharmonic vibrations and self-heating of a circular thermoviscoelastic plate with piezoelectric sensor and actuator are studied. The viscoelastic behavior of the passive (without piezoeffect) and piezoactive materials is described using the concept of complex moduli. The problems of electroelasticity and heat conduction are solved numerically, assuming that the mechanical load is unknown. The effect of self-heating on the active damping of the vibrations of the plate is analyzed     

Stress analysis of a thick plate having a circular hole under axisymmetric radial load

Summary In this paper a solution for the determination of stresses and displacements in a thick plate having a cylindrical hole subjected to localised hydrostatic loading has been given. Detail numerical results have been presented and compared with the results of an infinite hole subjected to localised hydrostatic load and a semiinfinite hole subjected to localised end load. It has been shown that for certain ratio of thickness of the pate to the radius of the hole and loading, the results could be obtained by using the solution of infinite or semiinfinite hole subjected to the same hydrostatic loading.

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Übersicht Es wird eine Lösung zur Bestimmung der Spannungen und Verschiebungen für eine dicke Platte mit einem zylindrischen Loch gegeben, die durch örtlichen hydrostatischen Druck belastet ist. Numerische Ergebnisse werden mit entsprechenden Ergebnissen verglichen, die für ein unendlich sowie für ein halbunendliches Loch unter gleichen Belastungen erhalten wurden. Es wird gezeigt, daß für bestimmte Verhältnisse der Plattendicke zu den Radien von Loch und Belastung die für unendliches oder halbunendliches Loch erhaltenen Ergebnisse bei gleicher Belastung ausreichend genau sind.

     

Finite amplitude vibrations of a circular plate

The problem of finite-amplitude, axisymmetric free and forced vibration of a circular plate is examined with various boundary conditions. The non-linear boundary-value problem is converted into the corresponding eigenvalue problem by elimination of the time variable. Then by a Newton-Raphson iteration scheme, and the concept of analytical continuation, the solution to the non-linear eigenvalue problem for the vibrations is obtained in a discrete form. It is seen that the removal of radial restraint causes drastic changes in the plate responses and the patterns of membrane stresses. Comparison with solutions based on the Berger assumption reveals the unsuitability of the assumption when the plate is not radially restrained.     

Nonstationary axisymmetric problem of electroelasticity for a piezoceramic cylinder with circular polarization

This paper considers the problem of the propagation of forced electroelastic axisymmetric torsional waves in a hollow piezoceramic cylinder of finite dimensions, whose curvilinear electroded surfaces are subjected to shear stresses or an electrical potential. A new closed solution is constructed by expansion in vector eigenfunctions using the structural algorithm of finite integral transforms, which makes it possible to determine vibration eigenfrequencies, the stress-strain state of the element, and the potential and intensity of the induced electrical field. __________ Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 50, No. 1, pp. 12–21, January–February, 2009.     

Planar electroelastic vibrations of piezoceramic rectangular plate and half-disk

An attempt is made to systematize experimental data for a rectangular piezoceramic plate and to compare them with those on planar vibrations of a thin piezoceramic half-disk. Experimental data on planar vibrations of a half-disk are discussed for the first time. Neighboring vibration modes of a rectangular plate with solid electrodes demonstrate strong superposition and coupling __________ Translated from Prikladnaya Mekhanika, Vol. 43, No. 5, pp. 89–96, May 2007.     

Nonaxisymmetric vibrations of circular piezoceramic multielectrode rings with thickness polarization

International Applied Mechanics -     

Flexural vibrations of a semiinfinite plate with a circular hole

Khar'kov Aviation Institute. Translated from Prikladnaya Mekhanika, Vol. 26, No. 3, pp. 69–73, March, 1990.     

Sound emission under forced vibrations of a circular sandwich plate

Zaporozh University. Translated from Prikladnaya Mekhanika, Vol. 26, No. 2, pp. 108–112, February, 1990.     

Forced axisymmetric vibrations and self-heating of thermoviscoelastic cylindrical shells with piezoelectric actuators

The coupled problem of the forced axisymmetric vibrations and self-heating of electrothermoviscoelastic cylindrical shells with piezoceramic actuators under monoharmonic electromechanical loading is solved. The temperature dependence of the complex characteristics of the passive and piezoactive materials is taken into account. The coupled nonlinear problem of electrothermoelasticity is solved by using a time-marching method with discrete orthogonalization at each time step (to integrate the equations of elasticity) and an explicit finite-difference method (to solve the heat-conduction equations). An analysis is made of the effect of the boundary conditions at the shell ends, the dimensions of the piezoactuator, and the self-heating temperature on the actuator voltage and the effectiveness of active damping of the forced vibrations of the shell under uniform transverse monoharmonic pressure