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Experimental modal analysis and modal parameters extraction
2009A case study approach in the inverse analysis of the modal extraction parameter has been implemented. The Mathematical model has been used to generate time response and random generator to generate added noise. The accuracy of modal parameters extraction techniques to error-contaminated measured data has been assessed for the simple examples.
Lozina, Željan +2 more
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Modal Parameter Estimation Using Acoustic Modal Analysis
2011Acoustic modal analysis (AMA) is of interest in cases where accelerometer measurements are limited by mounting techniques and where the mass of sensors affects the system dynamics. Major problems in performing AMA are time delay adjustment and the inability of obtaining true driving point measurements.
W. Elwali +4 more
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Modal parameter identification using simulated evolution
AIAA Journal, 1997A 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 Parameters For Cracked Rotors: Models And Comparisons
Journal of Sound and Vibration, 1994Abstract Two mathematical models for the study of modal parameters of cracked rotors are presented in this paper. The first model follows a Rayleigh-Ritz approach and the second is based on a finite element strategy. Both models can handle rotating rotors with variable cross-sections, carrying any number of disks, supported on several bearings and ...
Hamidi, L. +4 more
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Semi-Automated Operational Modal Analysis Methodology to Optimize Modal Parameter Estimation
Journal of Optimization Theory and Applications, 2020Nowadays, long-term monitoring systems rely on the efficient implementation of automated methodologies to extract the modal parameters of buildings and bridges to assess their structural integrity. However, modal parameter estimation, usually, requires a certain level of user interaction, mainly when parametric system identification methods are used ...
Eleonora Maria Tronci +3 more
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A Time-Domain Method for Identifying Modal Parameters
Journal of Applied Mechanics, 1986A time-domain method for identifying the modal parameters of a vibration system is presented. It is shown that system eigenvectors can be effectively estimated through the multivariate AR model representation of the system response to white noise excitation.
Wang, Zhenni, Fang, Tong
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Aliasing in Modal Parameter Estimation
SAE Technical Paper Series, 2007<div class="htmlview paragraph">Experimentalists are familiar with the aliasing that happens in data acquisition when the sampling rate is less than twice the highest frequency of energy in the signal to be sampled. Much effort has been made over the years using a combination of analog and digital filters to make sure that the higher frequencies ...
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FINITE DIFFERENCE FORMULATION FOR MODAL PARAMETER ESTIMATION
Journal of Sound and Vibration, 2000Summary: We deal with a new finite difference method for modal parameter estimation. This method uses formulas which involve differences between the frequency response data at three frequencies in the vicinity of a natural frequency to estimate this natural frequency together with the damping and the residue.
Yin, H. P., Duhamel, D.
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ON THE UNIQUENESS OF MODAL PARAMETER ESTIMATION
Journal of Sound and Vibration, 1996We examine the question of uniqueness of solution to the modal parameter problem by applying a least-squares output error estimator to a six-degree-of-freedom shear building using both a two- and a six-parameter model. Multiple solutions are located by initiating the iterative parameter estimation algorithm from random starting points.
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Extraction of Normal Modes and Full Modal Damping from Complex Modal Parameters
AIAA Journal, 1997The objective is a general damping correction procedure for determining the undamped modal parameters from damped system realization parameters. A discrete-time state-space realization of model test data is obtained using the eigensystem realization algorithm and polyreference, resulting in a set of difference equations. The realization is converted to
Alvin, K. F. +2 more
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