IMECH-IR  > 流固耦合系统力学重点实验室
 On contraction factors of Hermitian and skew-Hermitian splitting iteration method for generalized saddle point problems Alternative Title 关于广义鞍点问题的HSS迭代方法的收缩因子 Chen F(陈芳); Jiang YL(蒋耀林) Source Publication 应用数学与计算数学学报/COMMUN．APPL．MATH．COMPUT 2012-03-15 Volume 26Issue:1Pages:28-34 ISSN 1006-6330 Abstract The Hermitian and skew-Hermitian splitting(HSS) iteration method was presented and studied by Bai,et al.for solving non-Hermitian positive definite linear systems(Bai Z Z,Golub G H,Ng M K.Hermitian and skew-Hermitian splitting methods for non-Hermitian positive definite linear systems.SIAM J.Matrix Anal.Appl,2003,24:603-626). In this paper,contraction factors of the HSS iteration method in terms of the weighted 2-norm and the 2-norm are given,respectively, for the generalized saddle point problems. These contraction factors rather than the spectral radius of the iteration matrix essentially control the actual convergent speed of the HSS iteration method in practical computations．According to the analyses the contraction fator of the HSS iteration method for the generalized saddle point problem is one in the weighted 2-norm ．However．it nay be greater than or equal to one in the 2-norm and less than one in other suitable norms．Finally, numerical examples are used to examine the correctness of the theoretical results． Other Abstract 白中治等提出了解非埃尔米特正定线性方程组的埃尔米特和反埃尔米特分裂(HSS)迭代方法(Bai Z Z,Golub G H,Ng M K.Hermitian and skew-Hermitian splitting methodsfor non-Hermitian positive definite linear systems.SIAM J.Matrix Anal.Appl.,2003,24:603-626).本文精确地估计了用HSS迭代方法求解广义鞍点问题时在加权2-范数和2-范数下的收缩因子.在实际的计算中,正是这些收缩因子而不是迭代矩阵的谱半径,本质上控制着HSS迭代方法的实际收敛速度.根据文中的分析,求解广义鞍点问题的HSS迭代方法的收缩因子在加权2-范数下等于1,在2-范数下它会大于等于1,而在某种适当选取的范数之下,它则会小于1.最后,用数值算例说明了理论结果的正确性. Keyword 收缩因子 加权2-范数 2-范数 广义鞍点问题 Hss迭代方法 Contraction Factor Weighted 2-norm 2-norm Generalized Saddle Point Problem Hermitian And skew-Hermitian Splitting (Hss) Iteration Method Subject Area 计算流体力学 URL 查看原文 Language 英语 Funding Organization Project supported by the State Key Laboratory of Scientific/ Engineering Computing,Chinese Academy of Sciences; the International Science and Technology Cooperation Program of China(2010DFA14700); the National Natural Science Foundation of China(11071192) Department LMFS水环境流体力学(LEM) Document Type 期刊论文 Identifier http://dspace.imech.ac.cn/handle/311007/46458 Collection 流固耦合系统力学重点实验室 Corresponding Author Chen F(陈芳) Recommended CitationGB/T 7714 Chen F,Jiang YL. On contraction factors of Hermitian and skew-Hermitian splitting iteration method for generalized saddle point problems[J]. 应用数学与计算数学学报/COMMUN．APPL．MATH．COMPUT,2012,26(1):28-34. APA 陈芳,&蒋耀林.(2012).On contraction factors of Hermitian and skew-Hermitian splitting iteration method for generalized saddle point problems.应用数学与计算数学学报/COMMUN．APPL．MATH．COMPUT,26(1),28-34. MLA 陈芳,et al."On contraction factors of Hermitian and skew-Hermitian splitting iteration method for generalized saddle point problems".应用数学与计算数学学报/COMMUN．APPL．MATH．COMPUT 26.1(2012):28-34.