三维结线动力无穷元

构造一 亲的半解析结线动力无穷元。这种单元摆脱了一般离散型无穷元的形式，将衰减函数分别定义在无穷向结线上，从而不仅可同时考虑多种波动（Ｒ波、Ｐ波、Ｓ波）形式，而且对于不同介质，不必通过改变节点坐标分布的形式实现介质间的过渡，而直接以结线上参数的改变来实现。因而可以更好地模拟无穷波动场，使用起来为更方便，更容易推广。

3-D half-analytical dynamic infinite element

In this paper, a new 3\|D dynamic infinite element is presented. Since the wave displacement field of the present element is defined on the infinite edge instead of on the whole element as the conventional infinite element, it is very convenient to use this element to simulate the R\|wave, P\|wave, SH\|wave and SV\|wave simultaneously, and to satisfy the displacement continuity along the common boundary of neighbouring infinite elements in the case of dimulating multiple material layers. The transfer of different media is completed by the definition of parameters of the infinite edge, not by the modification of the node coordinate as the convertionalinfinite element. It is more economical to use this element to model the wave field of the unbounded domain.