Results 251 to 260 of about 288,967 (302)

Cable Modal Parameter Identification. II: Modal Tests

Journal of Engineering Mechanics, 2009
The cable dynamic stiffness describes the load – deformation behavior that reflects the cable intrinsic dynamic characteristics. It is defined as a ratio of response to excitation and represents a very similar frequency response property to the frequency response function (FRF). Therefore, by fitting both analytical cable dynamic stiffness and measured
Wei-Xin Ren, Wei-Hua Hu
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Modal analysis identification techniques

Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 2001
Summary: The objective is to give a general panorama of modal analysis identification techniques, as a detailed explanation is not possible due to the vast amount of available information concerning the many existing methods. Beginning with an introduction, followed by the various types of classification and a short historical note, the reader is led ...
Maia, N. M. M., Montalvão e Silva, J. M.   +1 more
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Modal parameter identification using simulated evolution

AIAA Journal, 1997
A global optimization algorithm based on the Darwinian evolutionary theory is implemented for the identification of modal parameters of linear vibrating structures. The capability of the evolutionary search method in locating the global minimum among numerous local minima is demonstrated.
Chiang, Dar-Yun, Huang, Si-Tsong
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Modal Parameter Identification of Controlled Structures

Journal of Guidance, Control, and Dynamics, 1997
A simple procedure to extract the modal parameters of the closed-loop structural system is proposed. It is formulated by using the extended Kalman filter (EKF) technique. The unknown parameters are eigenfrequencies, damping ratios, mode shapes, and modal masses.
Kasai, Tokio, Komatsu, Keiji, Sano, Masa
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Structural modal identification through ensemble empirical modal decomposition

Smart Structures and Systems, 2013
Identifying structural modal parameters, especially those modes within high frequency range, from ambient data is still a challenging problem due to various kinds of uncertainty involved in vibration measurements. A procedure applying an ensemble empirical mode decomposition (EEMD) method is proposed for accurate and robust structural modal ...
J. Zhang, R.Q. Yan, C.Q. Yang
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Thermoelasticity-based modal damage identification

International Journal of Fatigue, 2020
Abstract The response of linear dynamic structures can be decomposed into modal components, where each natural frequency is also represented by a corresponding mode shape and damping ratio. While vibration-fatigue-damage identification was recently expanded using modal decomposition, this research proposes a modal-decomposition-based thermoelastic ...
Capponi L., Slavic J., Rossi G., Boltezar M.   +3 more
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Comparison of two dissimilar modal identification techniques

Journal of Guidance, Control, and Dynamics, 1992
Recent laboratory results using a refined phase resonance method and the eigensystem realization algorithm on the same test structure are reported. These methods are dissimilar modal identification techniques suitable for future large spacecraft. The theory, application approach, and results obtained for each technique are summarized and compared ...
Pappa, R.S. (1), Schenk, A., Niedbal, N., Klusowski, E.   +3 more
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Output-only Modal Identification

2014
This chapter is focused on the methods for modal parameter estimation from previously acquired and pretreated time histories of the structural response to ambient vibrations. The fundamental assumptions of OMA methods and the basic concepts of structural dynamics models in time and frequency domain are illustrated, pointing out the common mathematical ...
Carlo Rainieri, Giovanni Fabbrocino
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Simulation of on-orbit modal identification

Acta Astronautica, 1991
Abstract Modularly designed large orbital systems cannot be tested as a total structure on earth. Size, zero-g design and the existing atmosphere conflict with traditional structural dynamic qualification. In order to avoid the associated problems with terrestrial testing some form of on-orbit testing is likely to be used.
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Modal identification using spectral moments

Structural Safety, 1985
Abstract The use of spectral moments has been proposed for estimating natural frequencies of vibration and equivalent viscous modal damping ratios from ambient response measurements of dynamically excited structures. The moments tend to be relatively more stable than spectral ordinates and may be derived from raw, unsmoothed periodograms.
S. Shyam Sunder, Stuart E. Grewatz, Seng Kiong Ting   +2 more
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