Results 221 to 230 of about 62,230 (267)

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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Extraction of Normal Modes and Full Modal Damping from Complex Modal Parameters

AIAA Journal, 1997
The 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., Peterson, L. D., Park, K. C.   +2 more
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Parameter Estimation Techniques for Modal Analysis

SAE Technical Paper Series, 1979
<div class="htmlview paragraph">Parameter estimation techniques that can be used to determine modal parameters (frequency, damping, and mode shape) from experimentally measured frequency response or unit impulse response are presented with respect to practical implementation and use.
D. L. Brown, R. J. Allemang, Ray Zimmerman, M. Mergeay   +3 more
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Modal effective parameters in structural dynamics

Revue Européenne des Éléments Finis, 1997
The authors review the concept of modal effective parameters within the context of modal superposition technique. They consider the general case of finite-degree of freedom linear structures in order to introduce the modal effective parameters which are independent of the normalization of eigenvectors.
Girard, Alain, Roy, Nicolas A.
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Cable Modal Parameter Identification. I: Theory

Journal of Engineering Mechanics, 2009
Cable modal parameters (natural frequencies and damping ratios) that represent the cable inherent dynamic characteristics play an important role in the construction, vibration control, condition assessment, and long-term health monitoring of cable-supported structures.
Wei-Xin Ren, Wei-Hua Hu
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Modal parameter estimation from base excitation

Journal of Sound and Vibration, 1986
Current software packages used for modal parameter identification are based on measured frequency response of either a fixed structure having no rigid body modes or a free structure with flexible supports. Procedures are now available to extract complex modes with the usual assumptions that the mass, stiffness and damping matrices are symmetric. In the
J.-G. Béliveau, F.R. Vigneron, Y. Soucy, S. Draisey   +3 more
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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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Autonomous Modal Parameter Estimation: Methodology

Traditionally, the estimation of modal parameters from a set of measured data has required significant experience. However, as the technology has matured, increasingly, analysis is being performed by less experienced engineers or technicians. To address this development, frequently software solutions are focusing upon either wizard-based or autonomous ...
A.W. Phillips, R.J. Allemang, D.L. Brown
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Modal Parameter Estimation on Automotive Development

SAE Technical Paper Series, 2012
<div class="section abstract"><div class="htmlview paragraph">Modal parameter identification is used to identify those parameters of the model which describe the dynamic properties of a vibration system. Structural dynamic methods and technologies have been used with great success by the automotive industry.
Valdinei Sczibor, Paulo S. L. Alves, Ilka Bringhenti   +2 more
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Parameter Identifiability Analysis by Modal Methods

IFAC Proceedings Volumes, 1982
Abstract Several techniques are available for a priori existence and uniqueness analysis (testing system and parameter identiflability) in the identification of linear models of specified structure from experiments with restricted input and observations.
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