Hamilton's principle is used to derive the equation of piezoelectric thin films and the dynamic finite element equations of intelligent structures.
利用哈密顿原理推导出压电结构的变分方程，建立了智能结构的有限元动力方程。
2
The elastic wave equations and the boundary conditions of SAW in different media are studied, and the behaviors of SAW in the isotropic, anisotropic and piezoelectric media are fully discussed.
The formulas of general force displacement electric fields for piezoelectric laminated shell were derived according to the laminate theory and piezoelectric constitutive equations.