吴锋   

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Language:English

Paper Publications

Title of Paper:广义特征值问题求解的改进Ritz向量法

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Date of Publication:2012-04-15

Journal:振动与冲击

Included Journals:EI、PKU、ISTIC、CSCD、Scopus

Volume:31

Issue:7

Page Number:19-23

ISSN No.:1000-3835

Key Words:广义特征值;Ritz向量法;重正交方案;模态比较法;投影矩阵;谱变换法

Abstract:从提高算法的稳定性和计算效率入手,采取迭代及防止漏根、多根的措施,对传统的Ritz向量法进行改进,提出改进的Ritz向量法.此算法仅需生成r维的Krylov空间,大大降低投影矩阵阶数,减少投影矩阵特征值计算时间.引入重正交方案和模态比较法,并给出Ritz向量块宽q与生成步数r的建议取值.最后通过四参数的谱变换法,不但提高了该算法的稳定性和计算效率,也拓宽了Ritz向量法的适用范围.并用算例证明该算法的优越性.

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