Naslov
Identification of Damping Using High-Speed Camera

Autori
Tomac, Ivan ; Slavič, Janko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, prošireni sažetak, znanstveni

Skup
IMAC 40. - International Modal Analysis Conference

Mjesto i datum
Online;, 15.02.2022

Vrsta sudjelovanja
Ostalo

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Morlet-wave ; spatial damping ; full-field

Sažetak
The use of high-speed cameras in structural dynamics provide contact-less measurements of displacements with a high spatial resolution, which enables measurements of a full-field response from a distant objects. Identification of modal parameters is a usually performed in monitoring of distant structures. Damping identification is a demanding task, even with high-dynamic-range sensors (accelerometers). Response obtained from high-speed camera has relatively small dynamic range and are contaminated with a relatively high level of noise. On the other hand, image-based techniques have the advantage of providing full-field structural identification which can be utilized to enhance identification data. Damping is modal parameter which, theoretically, is not spatially dependent. In this research we have used spatial over-determination to increase the accuracy of the damping identification which is based on the Morlet-wave damping identification method. The MWDI method is based on the Continuous Wavelet Transform, but it is significantly faster. The full-filed damping identification results were averaged with regard to the identified deflection shapes. The method was tested experimentally on the simple structure up to 2.5 kHz. It was found that the results are comparably accurate to the damping identified using the high-dynamic-range and low-noise piezoelectric accelerometer, proving that damping can be accurately identified from high-speed-camera measurements.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo, Zrakoplovstvo, raketna i svemirska tehnika, Temeljne tehničke znanosti

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