Damping identification with high speed camera

Ivan Tomac (Author), Janko Slavič (Author)

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.

Keywords

high speed cameras;damping;touchless measurement;

Data

Language:	English
Year of publishing:	2022
Typology:	1.08 - Published Scientific Conference Contribution
Organization:	UL FS - Faculty of Mechanical Engineering
UDC:	531/534
COBISS:	124105987
Views:	9
Downloads:	0
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary title:	Identifikacija dušenja z uporabo hitre kamere
Secondary 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).
Secondary keywords:	hitre kamere;dušenje;brezdotično merjenje;
Type (COBISS):	Other
Pages:	Str. 210-215
ID:	16653087