单元畸变对动力有限元方法计算精度的影响  

Effects of element distortions on the analytic precision of dynamic finite element method

作　　者：贾相玉[1] 周正华[1] 代志勇[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3期116-119,共4页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(50178065);地震科学联合基金课题(199131).

摘　　要：在有限元分析中,由于求解区域或边界的不规则,有限单元的划分会产生畸变单元。本文通过数值试验分析了有限单元畸变对动力有限元计算精度的影响,结果表明:长宽比畸变对动力有限元计算精度没有影响;当斜交角不小于30°时,斜交角对动力有限元计算精度的影响可忽略;锥度对动力有限元计算精度有影响,锥度越大,锥度对动力有限元计算精度的影响越大。In grid partition of finite element analysis, distortional elements may be introduced because of irregular analytic region or irregular boundary. In this paper, effects of element distortions on the analytic precision of dynamic finite element method are analyzed by numerical test, and the results are as follows:(1) distortion parameter of aspect ratio has no effect on the analytic precision;(2) effect of skew angle can be neglected when it is not less than 30°;(3) the larger the taper is, the greater its effect on the analytic precision is.

关 键 词：有限元分析 数值试验 计算精度 单元畸变 

分 类 号：P315.963[天文地球—地震学]