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Damping identification with high speed camera
ID Tomac, Ivan (Author), ID Slavič, Janko (Author)

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Abstract
High-speed cameras have the advantage over classical measuring techniques that measurements can be obtained from a distance, without having any contact with the structure and provide a full-field response. The latter advantage is utilized to reduce uncertainty of identified damping. Due to the high level of noise a Morlet-wave damping identification method is used. It has the advantages of the continuous wavelet transform, that are: a relatively good frequency separation and a high resistance to noise, but it is significantly faster and simpler. The full-field 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, only.

Language:English
Keywords:high speed cameras, damping, touchless measurement
Work type:Other
Typology:1.08 - Published Scientific Conference Contribution
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Year:2022
Number of pages:5 str.
PID:20.500.12556/RUL-141660 This link opens in a new window
UDC:531/534
COBISS.SI-ID:124105987 This link opens in a new window
Publication date in RUL:04.10.2022
Views:766
Downloads:66
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Record is a part of a monograph

Title:Kuhljevi dnevi 2022 : zbornik del
Editors:Janko Slavič, Martin Česnik
Place of publishing:Ljubljana
Publisher:Slovensko društvo za mehaniko
Year:2022
ISBN:978-961-93859-7-5
COBISS.SI-ID:121542403 This link opens in a new window

Secondary language

Language:Slovenian
Title:Identifikacija dušenja z uporabo hitre kamere
Abstract:
Hitrotekoče kamere imajo, v primerjavi s klasičnimi zaznavali, več prednost: omogočajo brezdotično merjenje, merjenje je lahko iz velikih razdalj, omogočajo prostorsko gosto meritev. Prostorska predoločenost se lahko uporabi za zmanjšanje merilnega šuma, kar je še posebej pomembno pri identifikaciji dušenja. Ta raziskava temelji na meritvah pomika, ki so zaznani s hitrotekočo kamero; podatke nato obdelamo z metodo za identifikacijo dušenja, ki temelji na Morletovem valčku. Metoda Morletovega valčka ima podobne lastnosti za identifikacijo dušenja, kakor jih ima zvezna valčna transformacija, vendar je bistveno hitrejša in nima robnega efekta, kateri pokvari identifikacijo na robovih signala. Rezultati identifikacije dušenja polnega polja so bili povprečni z utežjo, ki sledi lasni obliki analizirane lastne frekvence. Metoda je bila eksperimentalno preizkušena na strukturi z lastnimi frekvencami do 2,5 kHz. Ugotovljeno je bilo, da so rezultati temelječi na hitrotekoči kameri po natančnosti primerljivi tistim, ki temeljijo na zaznavalu z velikim dinamičnim razponom (piezoelektrični merilnik pospeška).

Keywords:hitre kamere, dušenje, brezdotično merjenje

Projects

Funder:EC - European Commission
Funding programme:European Union’s Horizon 2020
Project number:101027829
Name:Marie Skłodowska-Curie

Funder:ARRS - Slovenian Research Agency
Project number:N2-0144
Name:Optična metoda za obratovalno identifikacijo reduciranega nelinearnega modela

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