By using 3-d isoparametric element, the global stiffness matrix equation for the piezoelectric laminate is obtained on the bases of minimum principle of total potential energy.
由于最小势能原理，建立了单元刚度矩阵和压电材料的整体刚度方程。
According to the principle of minimum mean square error fit, the corresponding matrix formulation is developed.
遵循最小均方误差原理，给出了二维二阶拟合的矩阵表达式。
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