標題: SOLVING A STRUCTURED QUADRATIC EIGENVALUE PROBLEM BY A STRUCTURE-PRESERVING DOUBLING ALGORITHM 作者: Guo, Chun-HuaLin, Wen-Wei應用數學系Department of Applied Mathematics 關鍵字: palindromic quadratic eigenvalue problem;nonlinear matrix equation;stabilizing solution;structure-preserving;doubling algorithm 公開日期: 2010 摘要: In studying the vibration of fast trains, we encounter a palindromic quadratic eigen-value problem (QEP) (lambda(2)A(T)+lambda Q+A)z = 0, where A, Q is an element of C(nxn) and Q(T) = Q. Moreover, the matrix Q is block tridiagonal and block Toeplitz, and the matrix A has only one nonzero block in the upper-right corner. So most of the eigenvalues of the QEP are zero or infinity. In a linearization approach, one typically starts with deflating these known eigenvalues for the sake of efficiency. However, this initial deflation process involves the inverses of two potentially ill-conditioned matrices. As a result, large error might be introduced into the data for the reduced problem. In this paper we propose using the solvent approach directly on the original QEP, without any deflation process. We apply a structure-preserving doubling algorithm to compute the stabilizing solution of the matrix equation X + A(T)X(-1)A = Q, whose existence is guaranteed by a result on the Wiener-Hopf factorization of rational matrix functions associated with semi-infinite block Toeplitz matrices and a generalization of Bendixson's theorem to bounded linear operators on Hilbert spaces. The doubling algorithm is shown to be well defined and quadratically convergent. The complexity of the doubling algorithm is drastically reduced by using the Sherman-Morrison-Woodbury formula and the special structures of the problem. Once the stabilizing solution is obtained, all nonzero finite eigenvalues of the QEP can be found efficiently and with the automatic reciprocal relationship, while the known eigenvalues at zero or infinity remain intact. URI: http://hdl.handle.net/11536/6111http://dx.doi.org/10.1137/090763196 ISSN: 0895-4798 DOI: 10.1137/090763196 期刊: SIAM JOURNAL ON MATRIX ANALYSIS AND APPLICATIONS Volume: 31 Issue: 5 起始頁: 2784 結束頁: 2801 顯示於類別： 期刊論文