多次透射公式实用形式稳定性分析  

Stability analysis of practical formula for multi-transmitting boundary

作　　者：景立平[1] 

机构地区：[1]中国地震局工程力学研究所,黑龙江哈尔滨150080

出　　处：《地震工程与工程振动》2004年第4期20-24,共5页Earthquake Engineering and Engineering Dynamics

基　　金：地震科学联合基金项目(102030);中国地震局"十五"重点科研项目

摘　　要：本文以二维出平面波动方程为例,利用数值方法研究了多次透射公式的实用形式的稳定问题,结果表明:多次透射公式的实用形式与波动方程的集中质量显式有限元结合,不但存在零频漂移,而且同样存在高频振荡失稳,而与中心差分方法结合仅存在零频漂移失稳。Taking two-dimensional SH wave motion as an example,the author analyzes the stability of the practical formula of multi-transmitting artificial boundary by using numerical method. Results show that not only high frequency instability occurs ,but also zero frequency drift instability exists when the practical formula of multi-transmitting boundary combines with lumped-mass explicit finite element method. Only the zero frequency drift instability exists when the practical formula of multi transmitting boundary combines with central differential method of wave motion equation.

关 键 词：多次透射公式 稳定性 

分 类 号：P315.9[天文地球—地震学]