Experimental modal analysis performed by high-speed digital image correlation system

Measurement ◽  
2014 ◽  
Vol 50 ◽  
pp. 78-85 ◽  
Author(s):  
F. Trebuňa ◽  
M. Hagara
Keyword(s):  
Digital Image Correlation ◽  
Modal Analysis ◽  
Digital Image ◽  
High Speed ◽  
Experimental Modal Analysis ◽  
Image Correlation ◽  
Correlation System

scholarly journals Influence of Different Random Pattern Creation Forms on the Results of Experimental Modal Analysis Performed by High-Speed Digital Image Correlation

2014 ◽  
Vol 8 (1) ◽  
pp. 22-26 ◽  
Author(s):  
Martin Hagara ◽  
Martin Schrötter ◽  
Pavol Lengvarský
Keyword(s):  
Digital Image Correlation ◽  
Modal Analysis ◽  
Digital Image ◽  
High Speed ◽  
Sample Surface ◽  
Experimental Modal Analysis ◽  
Parameters Estimation ◽  
Image Correlation ◽  
Mode Shapes ◽  
Random Pattern

Abstract In this contribution an influence of random contrast patterns creation on the quality of the obtained results of experimental modal analysis performed by high-speed digital image correlation is described. Three common forms of random pattern creation were investigated. While the first form was presented by the black speckles printed on white matt vinyl foil and bonded on the sample surface, in the second and the third case, respectively, the black speckles were sprayed on white sprayed sample surface or on paint white one. For the purposes of modal parameters estimation in the form of natural frequencies, mode shapes and damping ratios the program called Modan3D, developed in the authors department, was used. The results obtained by Modan3D were compared with the results achieved by system Pulse specialized for vibration analysis.

The Influence of Facet Size on the Accuracy of Modal Parameters Determined by Digital Image Correlation Technique

2014 ◽  
Vol 611 ◽  
pp. 496-500 ◽  
Author(s):  
Róbert Huňady ◽  
Martin Hagara ◽  
František Šimčák
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
High Speed ◽  
Image Correlation ◽  
Modal Parameters ◽  
Correlation Technique ◽  
Correlation System ◽  
Correlation Process ◽  
The Impact ◽  
Facet Size

The paper deals with measurements of modal parameters using high-speed digital image correlation and assesses how the size of image elements (facets) influences the accuracy of modal parameters of the analyzed structure. The facet size is an important parameter that significantly affects the correlation process and its results. In the paper the experimental modal analysis of steel circular plate that has been excited by the impact hammer is described. Correlation system Q-450 Dantec Dynamics was used to measure the responses of the analyzed structure.

The Influence of Sampling Frequency on the Results of Motion Analysis Performed by High-Speed Digital Image Correlation

2015 ◽  
Vol 816 ◽  
pp. 397-403 ◽  
Author(s):  
Martin Hagara ◽  
Róbert Huňady
Keyword(s):  
Digital Image Correlation ◽  
Correlation Analysis ◽  
Experimental Determination ◽  
Digital Image ◽  
High Speed ◽  
Sampling Frequency ◽  
Image Correlation ◽  
Correlation System

The paper describes an experimental determination of kinematic quantities using high-speed digital image correlation system. It deals with the analysis of minimal sampling frequency needed for correctly performed high-speed correlation analysis. The authors also describe the influence of cameras sampling frequency on the quality of the obtained results. Mentioned analysis was performed using a rotational object. For the purposes of the results comparison the data obtained from correlation system in a form of displacements in three mutually perpendicular directions were processed in Matlab and in the paper are depicted in a form of graphical visualizations.

scholarly journals Investigation of Snake Robot Locomotion Possibilities in a Pipe

Symmetry ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 939 ◽  
Author(s):  
Ivan Virgala ◽  
Michal Kelemen ◽  
Pavol Božek ◽  
Zdenko Bobovský ◽  
Martin Hagara ◽  
...  
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
High Speed ◽  
Image Correlation ◽  
Planar Motion ◽  
Snake Robot ◽  
Robot Locomotion ◽  
Locomotion Pattern ◽  
Correlation System ◽  
The Stability

This paper analyzed the locomotion of a snake robot in narrow spaces such as a pipe or channel. We developed a unique experimental snake robot with one revolute and one linear joint on each module, with the ability to perform planar motion. The designed locomotion pattern was simulated in MATLAB R2015b and subsequently verified by the experimental snake robot. The locomotion of the developed snake robot was also experimentally analyzed on dry and viscous surfaces. The paper further describes the investigation of locomotion stability by three symmetrical curves used to anchor static modules between the walls of the pipe. The stability was experimentally analyzed by digital image correlation using a Q-450 Dantec Dynamics high-speed correlation system. The paper presents some input symmetrical elements of locomotion and describes their influence on the results of locomotion. The results of simulations and experiments show possibilities of snake robot locomotion in a pipe.

Full-field modal analysis during base motion excitation using high-speed 3D digital image correlation

2017 ◽  
Vol 28 (10) ◽  
pp. 105402 ◽  
Author(s):  
Ángel J Molina-Viedma ◽  
Elías López-Alba ◽  
Luis Felipe-Sesé ◽  
Francisco A Díaz
Keyword(s):  
Digital Image Correlation ◽  
Modal Analysis ◽  
Digital Image ◽  
High Speed ◽  
Image Correlation ◽  
Full Field ◽  
3D Digital Image Correlation
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