Two-Step Identification Approach for Damped Finite Element Models
Publication: Journal of Engineering Mechanics
Volume 124, Issue 6
Abstract
The application of well-established identification procedures in the time domain for finite element (FE) models with a larger number of degrees of freedom (DOF) in general causes quite severe difficulties; i.e., the solution diverges in most cases and the procedures are computationally too demanding. In this paper, a two-step identification approach is presented that is especially suitable for FE models with many DOF. The two complementary approaches are a least-square-based method and a special form of the Extended Kalman Filter. Both approaches use modal decomposition as a key for avoiding the initially mentioned problems. To enable the identification of local damping phenomena, nonclassically damped structures are assumed throughout the computational procedures, implying the solution of the complex eigenvalue problem. For this purpose, a subspace iteration is used for solving the eigenvalue problem advantageously.
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Information & Authors
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Published In
Journal of Engineering Mechanics
Volume 124 • Issue 6 • June 1998
Pages: 639 - 647
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Jun 1, 1998
Published in print: Jun 1998
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