To determine the natural frequencies and damping ratios of composite laminated plates, we present an efficient modal parameter estimation technique by developing a residual spectrum based structural dynamic system reconstruction. The modal parameters can be estimated from poles and residues of the system transfer functions derived from the state space system matrices. However, for modal parameter estimation of multivariable and higher order structural systems over broad frequency bands, this noniterative algorithm gives high accuracy in determining the natural frequencies and damping ratios. It is numerically well-behaved unlike iterative frequency-response-function (FRF) curve-fitting methods. We also discuss necessary conditions for convergence in Hankel norm and the error bounds of the approximated transfer function for the IDFT-based reconstruction system. From vibration tests on cross-ply and angle-ply composite laminates, the natural frequencies and damping ratios can be identified from the eigenvalues of the structural dynamic system matrix derived by the reconstruction method from the experimental frequency response functions. These results are compared with those of finite-element analysis and single-degree-of-freedom curve-fitting.
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December 2003
Technical Papers
Structural Dynamic System Reconstruction Method for Vibrating Structures
Hyeung-Yun Kim, Visiting Research Scholar
Hyeung-Yun Kim, Visiting Research Scholar
Stanford University, Aeronautics and Astronautics Department, Stanford University, 496 Lomita Mall, Durand Building, Stanford, CA 94305, USA
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Hyeung-Yun Kim, Visiting Research Scholar
Stanford University, Aeronautics and Astronautics Department, Stanford University, 496 Lomita Mall, Durand Building, Stanford, CA 94305, USA
Contributed by the Dynamic Systems, Measurement, and Control Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received by the ASME Dynamic Systems and Control Division March 30, 2001; final revision February 14, 2003. Associate Editor: C. D. Rahn.
J. Dyn. Sys., Meas., Control. Dec 2003, 125(4): 646-653 (8 pages)
Published Online: January 29, 2004
Article history
Received:
March 30, 2001
Revised:
February 14, 2003
Online:
January 29, 2004
Citation
Kim, H. (January 29, 2004). "Structural Dynamic System Reconstruction Method for Vibrating Structures ." ASME. J. Dyn. Sys., Meas., Control. December 2003; 125(4): 646–653. https://doi.org/10.1115/1.1605992
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