20.500.12556/RUL-102552
Spektralne komponente optičnega toka ob uporabi pulzno-širinske modulacije
Spectral components of optical flow using pulse-width modulation
Poznavanje dinamskega odziva strukture je ključnega pomena pri razvoju in odkrivanju pomanjkljivosti že realiziranih izdelkov. Pri eksperimentalnem določanju dinamskega odziva je zaradi njegove natančnosti pogosta uporaba pospeškomera. Namesto pospeškomera se lahko kot brezdotično metodo uporabi hitro kamero, a je cena take kamere zelo visoka.
V nalogi smo kot alternativo hitrim kameram predstavili in uporabili metodo za merjenje premikov s klasično kamero. V primerjavi s hitrimi kamerami je cena izvedbe metode zelo nizka, ločljivost slik pa bistveno višja. Metoda za zajem spektralnih komponent optičnega toka uporablja harmonično spreminjanje osvetlitve. Metodo smo delno spremenili - analogno krmiljenje svetlobnega vira smo nadomestili z digitalnim krmiljenjem s pomočjo pulzno-širinske modulacije. Z metodo smo izmerili amplitude nihanj vzbujane ploščice pri različnih frekvencah vzbujanja. Z zaporednimi meritvami pod enakimi pogoji smo potrdili delovanje metode, pri nižjih frekvencah vzbujanja pa tudi ponovljivost meritev.
Knowing the dynamic response of structure is crucial in the development and discovering deficiencies of already realised products. In the experimental determination of a dynamic response, an accelerometer is often used due to its accuracy. Instead of an accelerometer, a high-speed camera as contactless method can be used, but investment in such a camera is very high.
In this work, we presented and used a method for measuring displacements with classic camera as an alternative to high-speed cameras. Compared to high-speed cameras, the cost of implementing this method is significantly lower, while the resolution of images is much higher. Method uses harmonical changes in lighting for measuring spectral components of optical flow. We partially changed the used method - we replaced the analogue control of the light source with digital control using pulse-width modulation. We measured the oscillation amplitudes of an excited plate at different excitation frequencies. With successive measurements under the same conditions, we confirmed the validity of the method and the repeatability of measurements at lower excitation frequencies.
optični tok
pulzno-širinska modulacija
Lucas-Kanade
fotogrametrija
modalna analiza
generiranje signala
optical flow
pulse-width modulation
Lucas-Kanade
photogrammetry
modal analysis
signal generation
true
false
false
Slovenski jezik
Angleški jezik
Diplomsko delo/naloga
2018-09-02 07:45:28
2018-09-02 07:45:31
2022-08-15 03:42:28
0000-00-00 00:00:00
2018
0
0
0000-00-00
NiDoloceno
NiDoloceno
NiDoloceno
0000-00-00
0000-00-00
0000-00-00
1970-01-01
207465
1970.pdf
1970.pdf
1
26C8B7A97E874BD47483D664177004F6
419bff7cbb439bec89ea08af350b81c980bd79c795ad8bf7fd56c8f6f8b86763
8c9f4fb5-a1b5-11eb-a523-00155dcfd717
https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=112877
Fakulteta za strojništvo
0
0
0