用面向对象的方法实现有限元的子结构法

有文献给出了有限元单元的抽象类，抽象单元派生出单元是具体的三角形单元、四边形单元等，作者将子结构作为抽象单元类派生出的一种特殊单元，在面向对象的有限元分析中加入子结构计算功能只需对程序作很少的改动，采用对子结构单元刚度矩阵作一次Choleshi分解，多次使用分解后的三角矩阵的方法，大幅度减少了凝聚矩阵时计算工作量，作者给出了子结构类定义和采用子结构计算与整体结构计算的结果比较。

Sub-structural Method of FEM by the Object-Oriented Program

Some paper have presented the abstract element class of FEM, which the specific element class such as the triangle Element,the quadrilateral Element can be derived from. The substructure is the specific element class as the class derived form the abstract element class. The Object-Oriented FEM needs changing rearly when the sub-structural function is added to it. The Choleshi's disintegration of the sub-structural stiff is done and using the resolved triangular matrix many times can greatly reduce the work of the cohering matrix. The definition of the substructure class and the comparison between the sub_structural method and the normal method.