A Blind Source Separation Based Approach for Modal Parameter Estimation in Traditional Input-Output Experimental Modal Analysis Framework

Experimental modal analysis has grown steadily in popularity since the advent of the digital FFT spectrum analyser in the 1970’s. This days impact testing has become widespread as a fast and economical means of finding the vibration modes of a machine or structure. Its significantly use ascending roles can be seen also in the civil engineering industry [6]. This paper reviews the main topics associated with experimental modal analysis including making FRF measurements, modal excitation techniques, and modal parameter estimation from a set of FRFs.

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Increasing the Efficiency of Blind Source Separation Methods for Improved Modal Parameter Estimation

10.12783/shm2015/164 ◽

2015 ◽

Author(s):

PATRICK BREWICK ◽

ANDREW SMYTH

Keyword(s):

Parameter Estimation ◽

Blind Source Separation ◽

Source Separation ◽

Modal Parameter ◽

Modal Parameter Estimation

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Correction to: Semi-automated Operational Modal Analysis Methodology to Optimize Modal Parameter Estimation

Journal of Optimization Theory and Applications ◽

10.1007/s10957-020-01705-x ◽

2020 ◽

Author(s):

Eleonora M. Tronci ◽

Maurizio De Angelis ◽

Raimondo Betti ◽

Vittorio Altomare

Keyword(s):

Parameter Estimation ◽

Modal Analysis ◽

Operational Modal Analysis ◽

Modal Parameter ◽

Analysis Methodology ◽

Modal Parameter Estimation

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Experimental Modal Analysis: Efficient Geometry Model Creation Using Optical Techniques

Journal of the IEST ◽

10.17764/jiet.49.2.1210836g31831777 ◽

2006 ◽

Vol 49 (2) ◽

pp. 104-113 ◽

Cited By ~ 2

Author(s):

Steven Pauwels ◽

Jan Debille ◽

Jeff Komrower ◽

Jenny Lau

Keyword(s):

Modal Analysis ◽

Numerical Models ◽

Dynamic Properties ◽

Real Life ◽

Geometrical Model ◽

Experimental Modal Analysis ◽

Modal Parameter ◽

Optical Techniques ◽

Geometry Model ◽

Modal Parameter Estimation

Experimental modal analysis (EMA) is widely used to characterize the dynamic properties of structures. Recently EMA is being used on more complex structures often involving hundreds of measurement points. Modal analysis results are frequently used in combination with numerical models, imposing higher standards on the quality of the modal parameter estimation and the accuracy of the geometry models. These requirements are often contradictory to the availability of test cells and prototypes. In order to solve this challenge, innovative solutions using optical techniques have been developed that simplify and accelerate the creation of a geometrical model of a test object, while at the same time increase the accuracy of measured coordinates. Industrial applicability of these techniques is proven by a number of benchmarks on real-life structures.

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Modal Parameter Estimation for Underdamped Linear Dynamic Systems

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.486.233 ◽

2013 ◽

Vol 486 ◽

pp. 233-238

Author(s):

Fillemon Nduvu Nangolo

Keyword(s):

Parameter Estimation ◽

Modal Analysis ◽

Damping Ratio ◽

Analytical Data ◽

Modal Parameter ◽

Classical Dynamic ◽

Linear Dynamic Systems ◽

Analysis Techniques ◽

Vibration Parameters ◽

Modal Parameter Estimation

Modal parameter estimation is the estimation of frequency, damping ratio, and modal coefficients from experimental data. Modal analysis techniques are a common method used to determine these properties. The Least-Squares Complex Exponential (LSCE) and the Eigensystem Realization Algorithm (ERA) are one of the popular methods of modal analysis techniques. This paper presents an experimental verification of the LSCE and ERA methods. The investigation focuses on the estimation of natural frequencies, damping ratio and modal coefficients. To investigate this, artificial analytical data were processed in MATLAB environment to estimate the modal parameters. The identified vibration parameters from the LSCE and ERA were compared with the values based on classical dynamic theory, and the natural frequency and damping ratios percent of error were calculated.

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