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Damping identification based on a high-speed camera
ID
Tomac, Ivan
(
Author
),
ID
Slavič, Janko
(
Author
)
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https://www.sciencedirect.com/science/article/pii/S0888327021008281
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Abstract
Monitoring distant structures using a high-speed camera frequently relies on modal parameters. Even with high-dynamic-range sensors (e.g., accelerometers) damping identification is not trivial. With high-speed cameras the dynamic range is relatively small and contaminated with a relatively high level of noise. Image-based techniques have the advantage of providing contact-less full-field structural identification. While the damping is a modal parameter and theoretically not spatially dependent, this study looks at the potential to use the spatial over-determination, provided by the high-speed camera to increase the accuracy of the contact-less damping identification. High-speed cameras provide thousands of measurement locations, and identify the damping with noise-resistant methods like those based on the Continuous Wavelet Transform is numerically demanding. This research is built on the Morlet Wave Damping Identification method, which is based on the Continuous Wavelet Transform, but is also significantly faster. Finally, the full-field damping parameters were averaged with regard to the identified deflection shapes. The theory is extended with an experiment, where damping is identified for a simple structure at frequencies up to 2.5 kHz. It was found that the proposed method resulted in damping identification that was comparably accurate to the damping identified from high-dynamic-range and low-noise piezoelectric accelerometers. This research confirms that damping can be accurately identified from high-speed-camera measurements, only.
Language:
English
Keywords:
Morlet-wave
,
damping
,
spatial distribution
,
full-field
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Author Accepted Manuscript
Publication date:
01.03.2022
Year:
2022
Number of pages:
12 str.
Numbering:
Vol. 166, art. 108485
PID:
20.500.12556/RUL-142964
UDC:
531/534
ISSN on article:
0888-3270
DOI:
10.1016/j.ymssp.2021.108485
COBISS.SI-ID:
132558595
Publication date in RUL:
06.12.2022
Views:
603
Downloads:
78
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Record is a part of a journal
Title:
Mechanical systems and signal processing
Shortened title:
Mech. syst. signal process.
Publisher:
Elsevier
ISSN:
0888-3270
COBISS.SI-ID:
169243
Secondary language
Language:
Slovenian
Keywords:
Morletov valček
,
dušenje
,
prostorska porazdelitev
,
polno polje
Projects
Funder:
EC - European Commission
Funding programme:
H2020
Project number:
101027829
Name:
NOn-contact STRucturAl DAMage for fUture Safety and lightweight
Acronym:
NOSTRADAMUS
Funder:
ARRS - Slovenian Research Agency
Project number:
J2-1730
Name:
Polno zaznavanje prostorskih vibracij s hitro kamero z aplikacijami v digitalnih dvojčkih in oddaljenem zaznavanju
Funder:
HRZZ - Croatian Science Foundation
Project number:
IP-2018-01-6774
Name:
EVOLUCIJSKA SINTEZA OBLIKA S INTEGRALNIM I PARTICIONIRANIM 3D FENOTIPOVIMA, DINAMIČKOM PARAMETRIZACIJOM I BEZMREŽNIM MODELIRANJEM
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