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广义特征值问题求解的改进Ritz向量法 |
李秀梅1,吴 锋2 |
1.广西大学土木建筑工程学院,南宁 530004;
2.大连理工大学工程力学系,大连 116023 |
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ImprovedRitzvectormethodforgeneralizedeigenvalueproblems |
LIXiu-mei1,WUFeng2 |
1.SchoolofCivilandArchitectureEngineering,GuangxiUniversity,Nanning530004,China;2.DepartmentofEngineeringMechanics,DalianUniversityofTechnology,Dalian116023,China |
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摘要 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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关键词 :
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
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Abstract:Toimprovestabilityandefficiency,theimprovedRitzvectormethodwaspresented,iterationandsomeeffectivemeasuresavoidingrootleakageorextrarootswereadopted.ThetraditionalRitzvectormethodwasimproved.ThisnewmethodonlyneededrdimensionalKrylovspacetobeconstituted,greatlyreducedtheordernumberofprojectionmatrix,decreasedtheeigenvaluecomputingtimeofprojectionmatrix.Repeatedorthogonalityschemeandmodecompare methodwereintroduced.ThevaluesofblockwidthqanditerationsteprforRitzvectorweresuggested.Atlast,withafourparameterspectraltransformationmethod,thecomputationefficiencyandstabilityweregreatlyincreased.Atthesametime,theapplicablerangeofRitzvectormethodwasbroadened.Thenumericalexamplesweregiventodemonstratethevalidityandefficiencyoftheproposedmethod. |
Key words:
generalizedeigenvalue
Ritzvectormethod
repeatedorthogonalityscheme
modecomparemethod
projectionmatrix
spectraltransformationmethod
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收稿日期: 2010-10-08
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通讯作者:
李秀梅
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