Results 221 to 230 of about 39,844 (267)

On the redundancy of complex modal parameters

Applied Mathematics and Mechanics, 2004
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Chen, Kuifu, Jiao, Qunying
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Identification of Modal Parameters with Unknown Input

2003
The techniques developed for structural identification are typically devoted to obtain a structural model on the base of information on the response and on the forcing action. In many situations, however, it can be necessary to refer only to the measured responses.
DE ANGELIS, Maurizio, SEPE V., CAPECCHI, Danilo   +2 more
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Experimental modal analysis and modal parameters extraction

2009
A 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, Sedlar, Damir, Karišik, Edin   +2 more
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Modal Parameter Estimation Using Acoustic Modal Analysis

2011
Acoustic 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, H. Satakopan, V. Shauche, R. Allemang, A. Phillips   +4 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 Parameters For Cracked Rotors: Models And Comparisons

Journal of Sound and Vibration, 1994
Abstract 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., Piaud, J. B., Pastorel, H. W. M., Mansour, W. M., Massoud, M.   +4 more
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Semi-Automated Operational Modal Analysis Methodology to Optimize Modal Parameter Estimation

Journal of Optimization Theory and Applications, 2020
Nowadays, 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, Maurizio De Angelis, Raimondo Betti, Vittorio Altomare   +3 more
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A Time-Domain Method for Identifying Modal Parameters

Journal of Applied Mechanics, 1986
A 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, 2000
Summary: 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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