doktorsko delo
Domen Gorjup (Author), Janko Slavič (Mentor), Miha Boltežar (Co-mentor)

Abstract

Metode merjenja pomikov na podlagi digitalnih slik se vse bolj uveljavljajo na področju strukturne dinamike. Razloga za to sta predvsem brezdotično delovanje ter visoka prostorska ločljivost rezultatov, ki omogoča meritve polnega polja dinamskega odziva. Zajem slik iz več znanih, kalibriranih pogledov slikovnega sistema omogoča rekonstrukcijo prostorskih meritev v postopku triangulacije. V doktorskem delu predstavljamo izvirno metodo triangulacije pomikov nihajočih mehanskih struktur v frekvenčni domeni. Tak pristop odpravlja zahtevo po sočasnem zajemu več pogledov in omogoča uporabo ene same kamere za prostorske meritve. Dodatne prednosti predstavlja predlagan postopek kalibracije slikovnega sistema na podlagi znane geometrije merjenca, kar omogoča enostavno povezavo meritve z numeričnim modelom obravnavanega sistema in izbiro merilnih mest za analizo. Z razširitvijo nedavno predstavljene metode slikanja spektralnih komponent optičnega toka s postopkom triangulacije v frekvenčni domeni smo razvili tudi metodo merjenja prostorskih obratovalnih oblik struktur kompleksne geometrije z uporabo ene same fotografske kamere.

Keywords

merjenje vibracij;obratovalne oblike;slikovni sistemi;prostorske meritve;ena kamera;triangulacija v frekvenčni domeni;

Data

Language: Slovenian
Year of publishing:
Typology: 2.08 - Doctoral Dissertation
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [D. Gorjup]
UDC: 613.644:681.525(043.3)
COBISS: 136117251 Link will open in a new window
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Downloads: 102
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Other data

Secondary language: English
Secondary title: Spatial operational deflection shape identification using a single high-speed camera
Secondary abstract: Image-based displacement measurement methods are increasingly being used in the field of structural dynamics, the main reasons being their non-contacting operation and high spatial resolution, facilitating full-field vibration measurements. By utilizing multiple calibrated camera views in the imaging process, spatial displacements of the observed structure can be reconstructed using triangulation. In this thesis a novel, frequency-domain triangulation method is introduced. Using this approach, multiple views of the vibrating specimen no longer need to be imaged synchronously, facilitating spatial measurements using a single camera. Additionally, utilizing a known geometric model of the specimen in the imaging system calibration procedure simplifies the relation between the measurement and the numerical model of the structure under test and the selection of measurement points-of-interest. By extending the recently introduced Spectral Optical Flow Imaging method to multiple views using frequency-domain triangulation, a novel method is also introduced that enables the measurement of spatial operating deflection shapes of complex-shaped vibrating structures using a single still-frame camera.
Secondary keywords: vibration measurement;digital imaging systems;spatial measurement;
Type (COBISS): Doctoral dissertation
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za strojništvo
Pages: XXVI, 122 str.
ID: 17369274