O.V.Karnaukhova, V.I.Kozlov, A.O.Rasskazov Parametric vibration of a three-layered piezoelectric shells of revolution |
Acoustic bulletin, Vol. 4 ¹ 1, (2001) |
| The problem of parametrical vibrations of elastic three-layer shells composed from middle orthotropic dielectric or metal layer and two piezoelectrical layers is studied. On the basis of the mechanical Kirchoff-Love hypothesis and adequate assumptions for an electrical field the constitutive equations for forces and moments are obtained for varying electrode positions, type of polarization and electrical boundary conditions. It is shown how nonlinear and linearizated equations describing the parametrical vibrations of the arbitrary shaped shells can be obtained if the constitutive equations, universal equations of motion, kinematical equations and boundary conditions are used. The linearizated equations describe an area of dynamic unstability (ADU). On the boundary of ADU the harmonic motion occurs. This gives an opportunity to reduce the problem of investigations of the main ADU to solving the eigen value problems and the problem of static stability. Method of finite elements is developed to solve these problems. The problem of parametrical vibrations of a three-layered cylindrical piezopanel is considered in detail. The analytical solution of the problem is obtained for the case of simply supported edges. Correlation of an analytical and finite-element solutions demonstrate high accuracy of the first. The problem of parametrical vibrations under harmonic mechanical load is solved for the open-circuted and short-circuted conditions. The essential influence of the electrical boundary conditions on the size of ADU that can be used for control of the parametrical vibrations of the shells is shown. The finite-element solution of the problem of parametrical vibrations of cylindrical piezopanel with clamped edges is obtained. The numerical results point to essential influence of mechanical boundary conditions on the size and position of ADU. |
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KEY WORDS: layered shell, piezoelectric, parametric vibrations, finite element method |
| TEXT LANGUAGE: Russian |