Geometry measurement of automotive engine turbocharger rotors

V okviru zaključne naloge obravnavamo problem poškodovanega ohišja avtomobilskega turbopolnilnika. Poškodovani del se navari in postruži na novo obliko z nožem, ki je izdelan po obliki rotorja. Oblike rotorja ni mogoče enostavno izmeriti, saj so lopatice kompleksno ukrivljene. Razvili smo eksperimentalni slikovni sistem za hiter zajem slike rotorja med vrtenjem. Pri obdelavi slike izluščimo krivuljo, ki prikazuje zunanji obris rotorja in s tem tudi profil, ki se mu mora prilagajati ohišje turbopolnilnika. Profil smo iz slike izluščili na dva načina. Prvi je z ročnim obrisom, drugi pa s pomočjo programske kode, ki prepozna slikovne točke in jih popiše z matematično funkcijo. Ugotovili smo, da so dobljeni rezultati zelo natančni in konkurenčni dražjim metodam.As part of the final thesis task, we deal with the problem of a damaged turbocharger housing in a car. The damaged part is welded and turned using a tool made specifically for the shape of the rotor. The shape of the rotor is not easy to measure because the blades have a complex curvature. We have developed an experimental imaging system for a fast image acquisition of the rotor as it rotates. When processing the image, we extract a curve that follows the outer contour of the rotor and therefore also the profile that the turbocharger housing must conform to. We extract the profile from the image in two ways. The first is done with a manual outline, the second with the help of software code that recognizes pixels and plots them into a mathematical function. We have found that the results obtained are very accurate and competitive with more expensive methods