三维结线动力无穷元及其特性研究

研究了文献[2]提出的结线动力无穷元的特性及其参数确定。由于这种单元将衰减函数定义在无穷向结线上，从而不仅可同时考虑多种波动形式，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，使用起来更方便．更容易推广。

3-D Dynamic Infinite Element and its Characteristics Analysis

In this paper, the characteristics and parameter definition of the 3-D dynamic Infinite element proPOsed by Ref. [2] is analyzed. Since the wave displacement field of the present element is defined on the infinite edge instead of on the whole element as in the case of the conventional infinite clement, it is very convenient to use this element to simulate multiplc types of waves simultaneously, and to satisfy the displacement continuity along foe common boundary of neighbouring infinite elements in simulating multiple material layers. The transfer of different media is completed by the definition of parameters on the infinite edge, instead of by the modification of the node coordinate as in the case of the convenient infinite element. It is more economical to use this element to model foe wave field of the unbounded domain.