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Modal parameter identification from operative responses

, 2006
Modal parameter estimates of a structure, vibrating under actual loadings and operational conditions, have addressed the interest of researchers during the last years. For all the developed approaches, structures need not be excited by expensive devices, because the modal signature of the structure can be achieved from the knowledge of the system time ...
AGNENI, Alessandro, COPPOTELLI, Giuliano
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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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Identification of time varying modal parameters

The Aeronautical Journal, 1990
AbstractThe ability to track time varying frequency and damping parameters using on-line versions of seven time domain system identification algorithms; Least Squares, Double Least Squares, Correlation Fit, Instrumental Variables, Instrumental Matrix with Delayed Observations, Extended Least Squares and Maximum Likelihood, is examined.
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Identification of Modal Parameters of Rotors

1984
The occurence of instability in rotating machinery may be caused by different effects: oil film in journal bearings, sealings, internal damping etc.
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Multi‐modal parameter identification by automata approach

Journal of the Chinese Institute of Engineers, 1993
Abstract In this paper, we consider the multi‐modal function optimization problem. An automata model with improved learning schemes is proposed to solve the global optimization problem. Theoretically, we prove that the automaton converges to the global optimum with a probability arbitrarily close to 1.
Zen‐Kwei Huang, Sheng‐De Wang, Te‐Son Kuo   +2 more
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The Optimization and Autonomous Identification of Modal Parameters

For modal analysis (including SISO, MIMO, OMA), the accuracy of modal parameters depends mainly on the estimators used. Different parameters will be extracted even by the same user with the same method at different time. Here a criterion is presented which can compare the accuracy of the identification results.
J. M. Liu, S. Shen, M. Ying, S. W. Dong
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A DUAL FITTING ALGORITHM FOR MODAL PARAMETERS IDENTIFICATION

Mechanical Systems and Signal Processing, 2003
A dual fitting algorithm (DFA) for modal parameters identification is presented. The method is implemented in three steps: first, the coefficients of the Forsythe orthogonal polynomials for the rational fraction of the frequency response functions (FRFs) are obtained by fitting the experimental FRF data; then the coefficients of the orthogonal ...
H.H. CHEN, F. XU
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Identification of modal parameters from transmissibility measurements

Journal of Sound and Vibration, 2008
Abstract It is a well-known fact that linear dynamic behavior of structures can be studied by modeling the relation between force(s) [input(s)], acting on a structure, and their resulting structural vibration response(s) [output(s)]. For industrial structures, in their real in-operation conditions, it often becomes hard (or impossible) to ...
Devriendt, Christof, Guillaume, Patrick
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Identification of the Modal Parameters of a Flexibly Supported Casing

Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award, 1997
Satisfactory means for evaluating the vibration behaviour of gas turbine installations where it is impractical to obtain a satisfactory model of the support structure and where it has natural frequencies in the operating range are not yet available.
N. S. Feng, Eric J. Hahn
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On the Identification of the Modal Parameters for a Flexible Turbomachinery Foundation

Volume 7: Structures and Dynamics, Parts A and B, 2012
The evaluation of the vibration behaviour of turbomachinery installations, where the model of the rotor support structure (foundation or casing) is unknown and the foundation has natural frequencies in or near the operating speed range, is still problematic. An attractive approach for identifying the foundation uses motion measurements of the rotor and
Minli Yu, Ningsheng Feng, Eric J. Hahn
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