Complex mode random eigenvalue direct variance calculation method based on matrix perturbation theory

Abstract

The invention discloses a complex mode random eigenvalue direct variance calculation method based on the matrix perturbation theory. According to the method, first, the complex mode eigenvalue of structure vibration and the first-order perturbation quantity of corresponding eigenvectors generated when the rigidity, the damping, the mass and other parameters of a structure are changed are derived according to the matrix perturbation theory; then, a direct variance calculation algorithm for calculating the change range of the structure complex mode eigenvalue is established based on the eigenvalue of the complex mode structure and the first-order perturbation quantity of the eigenvectors according to the probability theory. When complex eigenvalue analysis of an asymmetric structure system is performed, the change range of the complex mode eigenvalue of the structure system can be rapidly and accurately acquired without knowing or supposing correlation coefficient matrixes of structure parameters, and therefore engineering application of the method to large structures is greatly facilitated.

Description

technical field [0001] The present invention is applicable to the analysis of eigenvalues ​​of complex modal structural systems, and is used to solve the statistical properties and variation range of complex modal eigenvalues ​​of the structural systems under the condition of various disturbances. Modal eigenvalue analysis techniques provide guidance. Background technique [0002] As a practical tool for fast sensitivity analysis and fast structural reanalysis, the matrix perturbation method has received extensive attention in basic theory and engineering applications and has achieved considerable development. X.W.YANG and S.H.CHEN applied Padeapproximation to matrix perturbation theory, and obtained the expressions of eigenvector and eigenvalue variation. KaminskiM and SoleckaM expanded the structural eigenvalues ​​and eigenvectors with the method of chaotic polynomials (PCE), and studied the forced vibration response analysis of linear stochastic systems. DebrajG applied...

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Problems solved by technology

[0004] At present, the research and application of matrix perturbation theory by scholars at home and abroad mostly focus on the structural real mode matrix perturbation method when the structural parameters of the system are real symmetric matrices, and in the perturbation method of structural complex mode theory, structural complex eigenvalue There is still little research on its statistical properties

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