摘要
有限元法生成的矩阵通常具有尺度和带宽很大的特点,应用子域精细积分面临着选择子域的困难。本文采用Householder方法将矩阵三对角化,从而使子域精细积分可用于大型有限元系统。通过在子域精细积分中引入预估-校正格式,可以在不需要迭代的情况下得到比蛙跳格式更高的精度。
The sizes and bandwidths of the matrices generated by finite element method are usually quite large, so it is difficult to choose a suitable subdomain when using subdomain precise integration method. By using Householder method to reduce the matrices to tridiagonal form in this paper, subdomain precise integration method can then be used in large finite element systems. More accurate results compared to modified midpoint method can be achieved without iterations by introducing predictor-corrector method to subdomain precise integration method.
出处
《计算力学学报》
EI
CAS
CSCD
北大核心
2009年第4期535-538,共4页
Chinese Journal of Computational Mechanics
