Finite element method is used to build up element stiffness matrix and element mass matrix. After the combined total stiffness matrix and the total mass matrix are obtained.
采用有限元法建立不同管道元件的单元刚度矩阵和单元质量矩阵，最终形成管道结构的总刚度矩阵和总质量矩阵。
The hydrodynamic pressure due to the coupled vibration is studied with Boundary Element Method, and the simplified formula for the attached mass matrix is derived.
运用自编边界元程序计算了闸门扰动时动水压力的分布，进而推导了附加质量阵的简化求法。
The stiffness matrix, equivalent nodal load and consistent mass matrix are derived for the beam element with variable cross-section.
导出了变截面梁单元的单元刚度矩阵、单元等效节点荷载和单元一致质量矩阵。
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