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Quadratic eigenvalue problem : ウィキペディア英語版
Quadratic eigenvalue problem
In mathematics, the quadratic eigenvalue problem〔F. Tisseur and K. Meerbergen, The quadratic eigenvalue problem, SIAM
Rev., 43 (2001), pp. 235–286.〕 (QEP), is to find scalar eigenvalues \lambda\,, left eigenvectors y\, and right eigenvectors x\, such that
: Q(\lambda)x = 0\texty^\ast Q(\lambda) = 0,\,
where Q(\lambda)=\lambda^2 A_2 + \lambda A_1 + A_0\,, with matrix coefficients A_2, \, A_1, A_0 \in \mathbb^ and we require that A_2\,\neq 0, (so that we have a nonzero leading coefficient). There are 2n\, eigenvalues that may be ''infinite'' or finite, and possibly zero. This is a special case of a nonlinear eigenproblem. Q(\lambda) is also known as a quadratic matrix polynomial.
==Applications==
A QEP can result in part of the dynamic analysis of structures discretized by the finite element method. In this case the quadratic, Q(\lambda)\, has the form Q(\lambda)=\lambda^2 M + \lambda C + K\,, where M\, is the mass matrix, C\, is the damping matrix and K\, is the stiffness matrix.
Other applications include vibro-acoustics and fluid dynamics.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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