Elements by the highly-accuracy six-node triangular element are divided. Stiffness matrix and mass matrix of sandwich panel are established and then deduced dynamical equations of finite elements.

应用高精度的六节点三角形单元进行单元划分，建立复合夹层板的刚度矩阵、质量矩阵并推导有限元动力学方程。

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The dynamical equations of rigid flexible coupling multibody systems have characters of stiffness and high frequency oscillation.

刚柔耦合多体机械系统动力学微分方程组具有刚性和高频振荡的特点。

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The method of dynamical measurement which was applied to analysis of pile driving is extended to test and measurement on the stiffness and strength of vertical joints between diaphragm walls.

将用于桩基检测的动测法，推广应用于地下连续墙纵向接缝刚性和强度的测试。

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